> -----Original Message----- > From: Matt [mailto:jackdachef@xxxxxxxxx] > Sent: Tuesday, February 15, 2011 5:12 PM > To: Minchan Kim > Cc: Dan Magenheimer; gregkh@xxxxxxx; Chris Mason; linux- > kernel@xxxxxxxxxxxxxxx; linux-mm@xxxxxxxxx; ngupta@xxxxxxxxxx; linux- > btrfs@xxxxxxxxxxxxxxx; Josef Bacik; Dan Rosenberg; Yan Zheng; > miaox@xxxxxxxxxxxxxx; Li Zefan > Subject: Re: [PATCH V2 0/3] drivers/staging: zcache: dynamic page > cache/swap compression > > On Mon, Feb 14, 2011 at 4:35 AM, Minchan Kim <minchan.kim@xxxxxxxxx> > wrote: > > On Mon, Feb 14, 2011 at 10:29 AM, Matt <jackdachef@xxxxxxxxx> wrote: > >> On Mon, Feb 14, 2011 at 1:24 AM, Matt <jackdachef@xxxxxxxxx> wrote: > >>> On Mon, Feb 14, 2011 at 12:08 AM, Matt <jackdachef@xxxxxxxxx> > wrote: > >>>> On Wed, Feb 9, 2011 at 1:03 AM, Dan Magenheimer > >>>> <dan.magenheimer@xxxxxxxxxx> wrote: > >>>> [snip] > >>>>> > >>>>> If I've missed anything important, please let me know! > >>>>> > >>>>> Thanks again! > >>>>> Dan > >>>>> > >>>> > >>>> Hi Dan, > >>>> > >>>> thank you so much for answering my email in such detail ! > >>>> > >>>> I shall pick up on that mail in my next email sending to the > mailing list :) > >>>> > >>>> > >>>> currently I've got a problem with btrfs which seems to get > triggered > >>>> by cleancache get-operations: > >>>> > >>>> > >>>> Feb 14 00:37:19 lupus kernel: [ 2831.297377] device fsid > >>>> 354120c992a00761-5fa07d400126a895 devid 1 transid 7 > >>>> /dev/mapper/portage > >>>> Feb 14 00:37:19 lupus kernel: [ 2831.297698] btrfs: enabling disk > space caching > >>>> Feb 14 00:37:19 lupus kernel: [ 2831.297700] btrfs: force lzo > compression > >>>> Feb 14 00:37:19 lupus kernel: [ 2831.315844] zcache: created > ephemeral > >>>> tmem pool, id=3 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853188] BUG: unable to handle > >>>> kernel paging request at 0000000001400050 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853219] IP: > [<ffffffff8133ef1b>] > >>>> btrfs_encode_fh+0x2b/0x120 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853242] PGD 0 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853251] Oops: 0000 [#1] > PREEMPT SMP > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853275] last sysfs file: > >>>> /sys/devices/platform/coretemp.3/temp1_input > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853295] CPU 4 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853303] Modules linked in: > radeon > >>>> ttm drm_kms_helper cfbcopyarea cfbimgblt cfbfillrect ipt_REJECT > >>>> ipt_LOG xt_limit xt_tcpudp xt_state nf_nat_irc nf_conntrack_irc > >>>> nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 > nf_conntrack_ftp > >>>> iptable_filter ipt_addrtype xt_DSCP xt_dscp xt_iprange ip_tables > >>>> ip6table_filter xt_NFQUEUE xt_owner xt_hashlimit xt_conntrack > xt_mark > >>>> xt_multiport xt_connmark nf_conntrack xt_string ip6_tables > x_tables > >>>> it87 hwmon_vid coretemp snd_seq_dummy snd_seq_oss > snd_seq_midi_event > >>>> snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss > snd_hda_codec_hdmi > >>>> snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep > snd_pcm > >>>> snd_timer snd soundcore i2c_i801 wmi e1000e shpchp snd_page_alloc > >>>> libphy e1000 scsi_wait_scan sl811_hcd ohci_hcd ssb usb_storage > >>>> ehci_hcd [last unloaded: tg3] > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853682] > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853690] Pid: 11394, comm: > >>>> btrfs-transacti Not tainted 2.6.37-plus_v16_zcache #4 FMP55/ipower > >>>> G3710 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853725] RIP: > >>>> 0010:[<ffffffff8133ef1b>] [<ffffffff8133ef1b>] > >>>> btrfs_encode_fh+0x2b/0x120 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853751] RSP: > >>>> 0018:ffff880129a11b00 EFLAGS: 00010246 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853767] RAX: 00000000000000ff > >>>> RBX: ffff88014a1ce628 RCX: 0000000000000000 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853788] RDX: ffff880129a11b3c > >>>> RSI: ffff880129a11b70 RDI: 0000000000000006 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853808] RBP: 0000000001400000 > >>>> R08: ffffffff8133eef0 R09: ffff880129a11c68 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853829] R10: 0000000000000001 > >>>> R11: 0000000000000001 R12: ffff88014a1ce780 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853849] R13: ffff88021fefc000 > >>>> R14: ffff88021fef9000 R15: 0000000000000000 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853870] FS: > >>>> 0000000000000000(0000) GS:ffff8800bf500000(0000) > >>>> knlGS:0000000000000000 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853894] CS: 0010 DS: 0000 > ES: > >>>> 0000 CR0: 000000008005003b > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853911] CR2: 0000000001400050 > >>>> CR3: 0000000001c27000 CR4: 00000000000006e0 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853932] DR0: 0000000000000000 > >>>> DR1: 0000000000000000 DR2: 0000000000000000 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853952] DR3: 0000000000000000 > >>>> DR6: 00000000ffff0ff0 DR7: 0000000000000400 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853973] Process btrfs- > transacti > >>>> (pid: 11394, threadinfo ffff880129a10000, task ffff880202e4ac40) > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853999] Stack: > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854006] ffff880129a11b50 > >>>> ffff880000000003 ffff88003c60a098 0000000000000003 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854035] ffffffffffffffff > >>>> ffffffff810e6aaa 0000000000000000 0000000602e4ac40 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854063] ffffffff8133e3f0 > >>>> ffffffff810e6cee 0000000000001000 0000000000000000 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854092] Call Trace: > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854103] [<ffffffff810e6aaa>] > ? > >>>> cleancache_get_key+0x4a/0x60 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854122] [<ffffffff8133e3f0>] > ? > >>>> btrfs_wake_function+0x0/0x20 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854140] [<ffffffff810e6cee>] > ? > >>>> __cleancache_flush_inode+0x3e/0x70 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854161] [<ffffffff810b34d2>] > ? > >>>> truncate_inode_pages_range+0x42/0x440 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854182] [<ffffffff812f115e>] > ? > >>>> btrfs_search_slot+0x89e/0xa00 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854201] [<ffffffff810c3a45>] > ? > >>>> unmap_mapping_range+0xc5/0x2a0 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854220] [<ffffffff810b3930>] > ? > >>>> truncate_pagecache+0x40/0x70 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854240] [<ffffffff813458b1>] > ? > >>>> btrfs_truncate_free_space_cache+0x81/0xe0 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854261] [<ffffffff812fce15>] > ? > >>>> btrfs_write_dirty_block_groups+0x245/0x500 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854283] [<ffffffff812fcb6a>] > ? > >>>> btrfs_run_delayed_refs+0x1ba/0x220 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854304] [<ffffffff8130afff>] > ? > >>>> commit_cowonly_roots+0xff/0x1d0 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854323] [<ffffffff8130c583>] > ? > >>>> btrfs_commit_transaction+0x363/0x760 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854344] [<ffffffff81067ea0>] > ? > >>>> autoremove_wake_function+0x0/0x30 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854364] [<ffffffff81305bc3>] > ? > >>>> transaction_kthread+0x283/0x2a0 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854383] [<ffffffff81305940>] > ? > >>>> transaction_kthread+0x0/0x2a0 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854401] [<ffffffff81305940>] > ? > >>>> transaction_kthread+0x0/0x2a0 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854420] [<ffffffff81067a16>] > ? > >>>> kthread+0x96/0xa0 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854437] [<ffffffff81003514>] > ? > >>>> kernel_thread_helper+0x4/0x10 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854455] [<ffffffff81067980>] > ? > >>>> kthread+0x0/0xa0 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854471] [<ffffffff81003510>] > ? > >>>> kernel_thread_helper+0x0/0x10 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854488] Code: 55 b8 ff 00 00 > 00 > >>>> 53 48 89 fb 48 83 ec 18 48 8b 6f 10 8b 3a 83 ff 04 0f 86 d5 00 00 > 00 > >>>> 85 c9 0f 95 c1 83 ff 07 0f 86 d5 00 00 00 <48> 8b 45 50 bf 05 00 > 00 00 > >>>> 48 89 06 84 c9 48 8b 85 68 fe ff ff > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854742] RIP > [<ffffffff8133ef1b>] > >>>> btrfs_encode_fh+0x2b/0x120 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854762] RSP > <ffff880129a11b00> > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854773] CR2: 0000000001400050 > >>>> Feb 14 00:39:20 lupus kernel: [ 2951.860906] ---[ end trace > >>>> f831c5ceeaa49287 ]--- > >>>> > >>>> in my case I had compress-force with lzo and disk_cache enabled > >>>> > >>>> > >>>> another user of the kernel I'm currently running has had the same > >>>> problem with zcache > >>>> (http://forums.gentoo.org/viewtopic-p-6571799.html#6571799) > >>>> > >>>> (looks like in his case compression and any other fancy additional > >>>> features weren't enabled) > >>>> > >>>> > >>>> changes made by this kernel or patchset to btrfs are from > >>>> * io-less dirty throttling patchset (44 patches) > >>>> * zcache V2 ("[PATCH] staging: zcache: fix memory leak" should be > >>>> applied in both cases) > >>>> * PATCH] fix (latent?) memory corruption in btrfs_encode_fh() > >>>> * btrfs-unstable changes to state of > >>>> 3a90983dbdcb2f4f48c0d771d8e5b4d88f27fae6 (so practically equals > btrfs > >>>> from 2.6.38-rc4+) > >>>> > >>>> I haven't tried downgrading to vanilla 2.6.37 with zcache only, > yet, > >>>> > >>>> but kind of upgraded btrfs to the latest state of the btrfs- > unstable > >>>> repository > (http://git.eu.kernel.org/?p=linux/kernel/git/mason/btrfs- > unstable.git;a=summary) > >>>> namely 3a90983dbdcb2f4f48c0d771d8e5b4d88f27fae6 > >>>> > >>>> this also didn't help and seemed to produce the same error-message > >>>> > >>>> so to summarize: > >>>> > >>>> 1) error message appearing with all 4 patchsets applied changing > >>>> btrfs-code and compress-force=lzo and disk_cache enabled > >>>> > >>>> 2) error message appearing with default mount-options and btrfs > from > >>>> 2.6.37 and changes for zcache & io-less dirty throttling patchset > >>>> applied (first 2 patch(sets)) from list) > >>>> > >>>> > >>>> in my case I tried to extract / play back a 1.7 GiB tarball of my > >>>> portage-directory (lots of small files and some tar.bzip2 > archives) > >>>> via pbzip2 or 7z when the error happened and the message was shown > >>>> > >>>> Due to KMS sound (webradio streaming) was still running but I > couldn't > >>>> continue work (X switching to kernel output) so I did the magic > sysrq > >>>> combo (reisub) > >>>> > >>>> > >>>> Does that BUG message ring a bell for anyone ? > >>>> > >>>> (if I should leave out anyone from the CC in the next emails or > >>>> future, please holler - I don't want to spam your inboxes) > >>>> > >>>> Thanks > >>>> > >>>> Matt > >>>> > >>> > >>> > >>> OK, > >>> > >>> here's the output of a kernel - > >>> > >>> staying as close to vanilla (2.6.37) as the current situation > allows > >>> (only including some corruption or leak fixes for zram & zcache and > >>> "zram_xvmalloc: 64K page fixes and optimizations" (and 2 reiserfs > >>> fixes)): > >>> > >>> so in total the following patches are included in this new kernel > >>> (2.6.37-zcache): > >>> > >>> zram changes: > >>> 1 zram: Fix sparse warning 'Using plain integer as NULL pointer' > >>> 2 [PATCH] zram: fix data corruption issue > >>> 3 [PATCH 0/7][v2] zram_xvmalloc: 64K page fixes and optimizations > >>> > >>> zcache: > >>> 1 zcache-linux-2.6.37-110205 > >>> 2 [PATCH] staging: zcache: fix memory leak > >>> 3 [PATCH] zcache: Fix build error when sysfs is not defined > >>> > >>> reiserfs: > >>> 1 [PATCH] reiserfs: Make sure va_end() is always called after > >>> 2 [patch] reiserfs: potential ERR_PTR dereference > >>> > >>> > >>> the same procedure: > >>> > >>> trying to extract the mentioned portage-tarball: > >>> > >>> time (7z e -so -tbzip2 -mmt=5 /system/portage_backup_022011.tbz2 | > tar > >>> -xp -C /usr/gentoo/) > >>> > >>> > >>> this hopefully should make it easier to track down the problem: > >>> > >>> > >>> Feb 14 01:59:59 lupus kernel: [ 364.777143] device fsid > >>> 684a4213565dd3fe-ca991821badc2aac devid 1 transid 7 > >>> /dev/mapper/portage > >>> Feb 14 01:59:59 lupus kernel: [ 364.844994] zcache: created > ephemeral > >>> tmem pool, id=2 > >>> Feb 14 02:02:49 lupus kernel: [ 534.577573] BUG: unable to handle > >>> kernel paging request at 0000000037610050 > >>> Feb 14 02:02:49 lupus kernel: [ 534.577605] IP: > [<ffffffff81338cbb>] > >>> btrfs_encode_fh+0x2b/0x110 > >>> Feb 14 02:02:49 lupus kernel: [ 534.577630] PGD 0 > >>> Feb 14 02:02:49 lupus kernel: [ 534.577640] Oops: 0000 [#1] > PREEMPT SMP > >>> Feb 14 02:02:49 lupus kernel: [ 534.577665] last sysfs file: > >>> /sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map > >>> Feb 14 02:02:49 lupus kernel: [ 534.577693] CPU 5 > >>> Feb 14 02:02:49 lupus kernel: [ 534.577701] Modules linked in: > radeon > >>> ttm drm_kms_helper cfbcopyarea cfbimgblt cfbfillrect ipt_REJECT > >>> ipt_LOG xt_limit xt_tcpudp xt_state nf_nat_irc nf_conntrack_irc > >>> nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_ftp > >>> iptable_filter ipt_addrtype xt_DSCP xt_dscp xt_iprange ip_tables > >>> ip6table_filter xt_NFQUEUE xt_owner xt_hashlimit xt_conntrack > xt_mark > >>> xt_multiport xt_connmark nf_conntrack xt_string ip6_tables x_tables > >>> it87 hwmon_vid coretemp snd_seq_dummy snd_seq_oss > snd_seq_midi_event > >>> snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_hda_codec_hdmi > >>> snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm > >>> snd_timer snd e1000e soundcore i2c_i801 shpchp snd_page_alloc wmi > >>> libphy e1000 scsi_wait_scan sl811_hcd ohci_hcd ssb usb_storage > >>> ehci_hcd [last unloaded: tg3] > >>> Feb 14 02:02:49 lupus kernel: [ 534.578114] > >>> Feb 14 02:02:49 lupus kernel: [ 534.578124] Pid: 8285, comm: tar > Not > >>> tainted 2.6.37-zcache #2 FMP55/ipower G3710 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578146] RIP: > >>> 0010:[<ffffffff81338cbb>] [<ffffffff81338cbb>] > >>> btrfs_encode_fh+0x2b/0x110 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578172] RSP: > >>> 0018:ffff88023ea9dcc8 EFLAGS: 00010246 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578189] RAX: 00000000000000ff > >>> RBX: ffff8800b8643228 RCX: 0000000000000000 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578210] RDX: ffff88023ea9dd04 > >>> RSI: ffff88023ea9dd38 RDI: 0000000000000006 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578230] RBP: 0000000037610000 > >>> R08: ffffffff81338c90 R09: 0000000000000000 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578251] R10: 0000000000000019 > >>> R11: 0000000000000001 R12: ffff8800b8643380 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578272] R13: ffff8800b8643258 > >>> R14: 00007fff806f1f00 R15: 0000000000000000 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578293] FS: > >>> 00007f823d7ed700(0000) GS:ffff8800bf540000(0000) > >>> knlGS:0000000000000000 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578317] CS: 0010 DS: 0000 ES: > >>> 0000 CR0: 0000000080050033 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578334] CR2: 0000000037610050 > >>> CR3: 000000023dcef000 CR4: 00000000000006e0 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578356] DR0: 0000000000000000 > >>> DR1: 0000000000000000 DR2: 0000000000000000 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578377] DR3: 0000000000000000 > >>> DR6: 00000000ffff0ff0 DR7: 0000000000000400 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578398] Process tar (pid: > 8285, > >>> threadinfo ffff88023ea9c000, task ffff88023e8b9d40) > >>> Feb 14 02:02:49 lupus kernel: [ 534.578421] Stack: > >>> Feb 14 02:02:49 lupus kernel: [ 534.578428] 000000013d096000 > >>> ffff88023ed84800 ffff88023ea9c000 0000000000000002 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578458] ffffffffffffffff > >>> ffffffff810e3b1a 0000000000000001 000000061e1d5240 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578486] fffffffffffffffb > >>> ffffffff810e3d5e ffff88010f383000 0000001ab86cb908 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578514] Call Trace: > >>> Feb 14 02:02:49 lupus kernel: [ 534.578525] [<ffffffff810e3b1a>] > ? > >>> cleancache_get_key+0x4a/0x60 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578544] [<ffffffff810e3d5e>] > ? > >>> __cleancache_flush_inode+0x3e/0x70 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578565] [<ffffffff810b0ed2>] > ? > >>> truncate_inode_pages_range+0x42/0x440 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578586] [<ffffffff81338451>] > ? > >>> btrfs_tree_unlock+0x41/0x50 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578605] [<ffffffff812e4ed5>] > ? > >>> btrfs_release_path+0x15/0x70 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578624] [<ffffffff8130bf29>] > ? > >>> btrfs_run_delayed_iputs+0x49/0x120 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578644] [<ffffffff813107e7>] > ? > >>> btrfs_evict_inode+0x27/0x1e0 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578663] [<ffffffff810fc3aa>] > ? > >>> evict+0x1a/0xa0 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578678] [<ffffffff810fc6bd>] > ? > >>> iput+0x1cd/0x2b0 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578694] [<ffffffff810f266f>] > ? > >>> do_unlinkat+0x12f/0x1d0 > >>> Feb 14 02:02:49 lupus kernel: [ 534.578712] [<ffffffff810027bb>] > ? > >>> system_call_fastpath+0x16/0x1b > >>> Feb 14 02:02:49 lupus kernel: [ 534.578730] Code: 55 b8 ff 00 00 > 00 > >>> 53 48 89 fb 48 83 ec 18 48 8b 6f 10 8b 3a 83 ff 04 0f 86 d5 00 00 > 00 > >>> 85 c9 0f 95 c1 83 ff 07 0f 86 d5 00 00 00 <48> 8b 45 50 bf 05 00 00 > 00 > >>> 48 89 06 84 c9 48 8b 85 68 fe ff ff > >>> Feb 14 02:02:49 lupus kernel: [ 534.578986] RIP > [<ffffffff81338cbb>] > >>> btrfs_encode_fh+0x2b/0x110 > >>> Feb 14 02:02:49 lupus kernel: [ 534.579081] RSP > <ffff88023ea9dcc8> > >>> Feb 14 02:02:49 lupus kernel: [ 534.579093] CR2: 0000000037610050 > >>> Feb 14 02:02:49 lupus kernel: [ 534.587513] ---[ end trace > >>> c596b12e66c0b360 ]--- > >>> > >>> > >>> for reference I've pasted it to pastebin.com: > >>> > >>> "2.6.37_zcache_V2.patch" > >>> http://pastebin.com/cVSkwQ6M > >>> > >>> > >>> > >>> > >>> > >>> after the reboot I had forgotten to not mount the btrfs volume and > it > >>> threw a similar error-message again and remounted several > partitions > >>> read-only (including the system partition) > >>> the partition with btrfs (/usr/gentoo) couldn't be unmounted since > the > >>> umount process kind of hang > >>> > >>> so here's the error message after a reboot (might not be accurate > or > >>> kind of "skewed" since other patches are included (io-less dirty > >>> throttling, PATCH] fix (latent?) memory corruption in > >>> btrfs_encode_fh() and latest changes for btrfs)) but might help to > get > >>> some more evidence: > >>> > >>> > >>> Feb 14 02:05:46 lupus kernel: [ 63.922648] device fsid > >>> 684a4213565dd3fe-ca991821badc2aac devid 1 transid 13 > >>> /dev/mapper/portage > >>> Feb 14 02:05:46 lupus kernel: [ 64.047118] btrfs: unlinked 1 > orphans > >>> Feb 14 02:05:46 lupus kernel: [ 64.051956] zcache: created > ephemeral > >>> tmem pool, id=3 > >>> Feb 14 02:05:48 lupus kernel: [ 65.801364] hub 2-1:1.0: > hub_suspend > >>> Feb 14 02:05:48 lupus kernel: [ 65.801376] usb 2-1: unlink > >>> qh256-0001/ffff88023fefd180 start 1 [1/0 us] > >>> Feb 14 02:05:48 lupus kernel: [ 65.801559] usb 2-1: usb auto- > suspend > >>> Feb 14 02:05:50 lupus kernel: [ 67.797929] hub 2-0:1.0: > hub_suspend > >>> Feb 14 02:05:50 lupus kernel: [ 67.797939] usb usb2: bus auto- > suspend > >>> Feb 14 02:05:50 lupus kernel: [ 67.797942] ehci_hcd 0000:00:1d.0: > >>> suspend root hub > >>> Feb 14 02:05:52 lupus kernel: [ 70.050493] BUG: unable to handle > >>> kernel paging request at 0000030341ed0050 > >>> Feb 14 02:05:52 lupus kernel: [ 70.050670] IP: > [<ffffffff8133ef1b>] > >>> btrfs_encode_fh+0x2b/0x120 > >>> Feb 14 02:05:52 lupus kernel: [ 70.050807] PGD 0 > >>> Feb 14 02:05:52 lupus kernel: [ 70.050929] Oops: 0000 [#1] > PREEMPT SMP > >>> Feb 14 02:05:52 lupus kernel: [ 70.051223] last sysfs file: > >>> /sys/module/pcie_aspm/parameters/policy > >>> Feb 14 02:05:52 lupus kernel: [ 70.051365] CPU 6 > >>> Feb 14 02:05:52 lupus kernel: [ 70.051411] Modules linked in: > >>> ipt_REJECT ipt_LOG xt_limit xt_tcpudp xt_state nf_nat_irc > >>> nf_conntrack_irc nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 > >>> nf_conntrack_ftp iptable_filter ipt_addrtype xt_DSCP xt_dscp > >>> xt_iprange ip_tables ip6table_filter xt_NFQUEUE xt_owner > xt_hashlimit > >>> xt_conntrack xt_mark xt_multiport xt_connmark nf_conntrack > xt_string > >>> ip6_tables x_tables it87 hwmon_vid coretemp snd_seq_dummy > snd_seq_oss > >>> snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss > >>> snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel > snd_hda_codec > >>> snd_hwdep snd_pcm snd_timer snd i2c_i801 soundcore wmi shpchp > e1000e > >>> snd_page_alloc libphy e1000 scsi_wait_scan sl811_hcd ohci_hcd ssb > >>> usb_storage ehci_hcd [last unloaded: tg3] > >>> Feb 14 02:05:52 lupus kernel: [ 70.054694] > >>> Feb 14 02:05:52 lupus kernel: [ 70.054776] Pid: 7962, comm: > umount > >>> Not tainted 2.6.37-plus_v16_zcache #4 FMP55/ipower G3710 > >>> Feb 14 02:05:52 lupus kernel: [ 70.054912] RIP: > >>> 0010:[<ffffffff8133ef1b>] [<ffffffff8133ef1b>] > >>> btrfs_encode_fh+0x2b/0x120 > >>> Feb 14 02:05:52 lupus kernel: [ 70.055084] RSP: > >>> 0018:ffff88023c77d6f8 EFLAGS: 00010246 > >>> Feb 14 02:05:52 lupus kernel: [ 70.055173] RAX: 00000000000000ff > >>> RBX: ffff88023cde0168 RCX: 0000000000000000 > >>> Feb 14 02:05:52 lupus kernel: [ 70.055265] RDX: ffff88023c77d734 > >>> RSI: ffff88023c77d768 RDI: 0000000000000006 > >>> Feb 14 02:05:52 lupus kernel: [ 70.055357] RBP: 0000030341ed0000 > >>> R08: ffffffff8133eef0 R09: ffff88023c77d8d8 > >>> Feb 14 02:05:52 lupus kernel: [ 70.055448] R10: 0000000000000003 > >>> R11: 0000000000000001 R12: 00000000ffffffff > >>> Feb 14 02:05:52 lupus kernel: [ 70.055540] R13: ffff88023cde0030 > >>> R14: ffffea0007dd39f0 R15: 0000000000000001 > >>> Feb 14 02:05:52 lupus kernel: [ 70.055633] FS: > >>> 00007fb1cad04760(0000) GS:ffff8800bf580000(0000) > >>> knlGS:0000000000000000 > >>> Feb 14 02:05:52 lupus kernel: [ 70.055762] CS: 0010 DS: 0000 ES: > >>> 0000 CR0: 000000008005003b > >>> Feb 14 02:05:52 lupus kernel: [ 70.055851] CR2: 0000030341ed0050 > >>> CR3: 000000023c7d5000 CR4: 00000000000006e0 > >>> Feb 14 02:05:52 lupus kernel: [ 70.055943] DR0: 0000000000000000 > >>> DR1: 0000000000000000 DR2: 0000000000000000 > >>> Feb 14 02:05:52 lupus kernel: [ 70.056035] DR3: 0000000000000000 > >>> DR6: 00000000ffff0ff0 DR7: 0000000000000400 > >>> Feb 14 02:05:52 lupus kernel: [ 70.056128] Process umount (pid: > >>> 7962, threadinfo ffff88023c77c000, task ffff88023c7a4260) > >>> Feb 14 02:05:52 lupus kernel: [ 70.056257] Stack: > >>> Feb 14 02:05:52 lupus kernel: [ 70.056338] 0000000000000000 > >>> 0000000000000002 ffff880200000000 0000000000000003 > >>> Feb 14 02:05:52 lupus kernel: [ 70.056630] ffffea0007dd39f0 > >>> ffffffff810e6aaa ffff880200000041 0000000600000246 > >>> Feb 14 02:05:52 lupus kernel: [ 70.056922] ffff88023cdcd300 > >>> ffffffff810e6b3a 0000000000000001 ffffffff8132bb7c > >>> Feb 14 02:05:52 lupus kernel: [ 70.057213] Call Trace: > >>> Feb 14 02:05:52 lupus kernel: [ 70.057301] [<ffffffff810e6aaa>] > ? > >>> cleancache_get_key+0x4a/0x60 > >>> Feb 14 02:05:52 lupus kernel: [ 70.057393] [<ffffffff810e6b3a>] > ? > >>> __cleancache_get_page+0x7a/0xd0 > >>> Feb 14 02:05:52 lupus kernel: [ 70.057487] [<ffffffff8132bb7c>] > ? > >>> merge_state+0x7c/0x150 > >>> Feb 14 02:05:52 lupus kernel: [ 70.057579] [<ffffffff8132e4de>] > ? > >>> __extent_read_full_page+0x52e/0x710 > >>> Feb 14 02:05:52 lupus kernel: [ 70.057673] [<ffffffff813bdea4>] > ? > >>> rb_insert_color+0xa4/0x140 > >>> Feb 14 02:05:52 lupus kernel: [ 70.057766] [<ffffffff8134b0b6>] > ? > >>> tree_insert+0x86/0x1e0 > >>> Feb 14 02:05:52 lupus kernel: [ 70.057859] [<ffffffff81058c73>] > ? > >>> lock_timer_base.clone.22+0x33/0x70 > >>> Feb 14 02:05:52 lupus kernel: [ 70.058004] [<ffffffff81305060>] > ? > >>> btree_get_extent+0x0/0x1c0 > >>> Feb 14 02:05:52 lupus kernel: [ 70.058097] [<ffffffff81330b21>] > ? > >>> read_extent_buffer_pages+0x2d1/0x470 > >>> Feb 14 02:05:52 lupus kernel: [ 70.058191] [<ffffffff81305060>] > ? > >>> btree_get_extent+0x0/0x1c0 > >>> Feb 14 02:05:52 lupus kernel: [ 70.058283] [<ffffffff8130674d>] > ? > >>> btree_read_extent_buffer_pages.clone.65+0x4d/0xa0 > >>> Feb 14 02:05:52 lupus kernel: [ 70.058415] [<ffffffff813076f9>] > ? > >>> read_tree_block+0x39/0x60 > >>> Feb 14 02:05:52 lupus kernel: [ 70.058508] [<ffffffff812ed5e6>] > ? > >>> read_block_for_search.clone.40+0x116/0x410 > >>> Feb 14 02:05:52 lupus kernel: [ 70.058638] [<ffffffff812eb228>] > ? > >>> btrfs_cow_block+0x118/0x2b0 > >>> Feb 14 02:05:52 lupus kernel: [ 70.058731] [<ffffffff812f0bc7>] > ? > >>> btrfs_search_slot+0x307/0xa00 > >>> Feb 14 02:05:52 lupus kernel: [ 70.058823] [<ffffffff812f6b18>] > ? > >>> lookup_inline_extent_backref+0x98/0x4a0 > >>> Feb 14 02:05:52 lupus kernel: [ 70.058919] [<ffffffff810e33d7>] > ? > >>> kmem_cache_alloc+0x87/0xa0 > >>> Feb 14 02:05:52 lupus kernel: [ 70.059032] [<ffffffff812f891c>] > ? > >>> __btrfs_free_extent+0xcc/0x6f0 > >>> Feb 14 02:05:52 lupus kernel: [ 70.059125] [<ffffffff812fc4cf>] > ? > >>> run_clustered_refs+0x39f/0x880 > >>> Feb 14 02:05:52 lupus kernel: [ 70.059220] [<ffffffff810b1f98>] > ? > >>> pagevec_lookup_tag+0x18/0x20 > >>> Feb 14 02:05:52 lupus kernel: [ 70.059312] [<ffffffff810a7c81>] > ? > >>> filemap_fdatawait_range+0x91/0x180 > >>> Feb 14 02:05:52 lupus kernel: [ 70.059405] [<ffffffff812fca77>] > ? > >>> btrfs_run_delayed_refs+0xc7/0x220 > >>> Feb 14 02:05:52 lupus kernel: [ 70.059498] [<ffffffff8130c29c>] > ? > >>> btrfs_commit_transaction+0x7c/0x760 > >>> Feb 14 02:05:52 lupus kernel: [ 70.059591] [<ffffffff81067ea0>] > ? > >>> autoremove_wake_function+0x0/0x30 > >>> Feb 14 02:05:52 lupus kernel: [ 70.059683] [<ffffffff8130cdef>] > ? > >>> start_transaction+0x1bf/0x270 > >>> Feb 14 02:05:52 lupus kernel: [ 70.059775] [<ffffffff8110e96a>] > ? > >>> __sync_filesystem+0x5a/0x90 > >>> Feb 14 02:05:52 lupus kernel: [ 70.059867] [<ffffffff810eae8d>] > ? > >>> generic_shutdown_super+0x2d/0x100 > >>> Feb 14 02:05:52 lupus kernel: [ 70.059960] [<ffffffff810eafb9>] > ? > >>> kill_anon_super+0x9/0x50 > >>> Feb 14 02:05:52 lupus kernel: [ 70.060051] [<ffffffff810eb266>] > ? > >>> deactivate_locked_super+0x26/0x80 > >>> Feb 14 02:05:52 lupus kernel: [ 70.060144] [<ffffffff811043ea>] > ? > >>> sys_umount+0x7a/0x390 > >>> Feb 14 02:05:52 lupus kernel: [ 70.060235] [<ffffffff810027bb>] > ? > >>> system_call_fastpath+0x16/0x1b > >>> Feb 14 02:05:52 lupus kernel: [ 70.060325] Code: 55 b8 ff 00 00 > 00 > >>> 53 48 89 fb 48 83 ec 18 48 8b 6f 10 8b 3a 83 ff 04 0f 86 d5 00 00 > 00 > >>> 85 c9 0f 95 c1 83 ff 07 0f 86 d5 00 00 00 <48> 8b 45 50 bf 05 00 00 > 00 > >>> 48 89 06 84 c9 48 8b 85 68 fe ff ff > >>> Feb 14 02:05:52 lupus kernel: [ 70.063170] RIP > [<ffffffff8133ef1b>] > >>> btrfs_encode_fh+0x2b/0x120 > >>> Feb 14 02:05:52 lupus kernel: [ 70.063302] RSP > <ffff88023c77d6f8> > >>> Feb 14 02:05:52 lupus kernel: [ 70.063386] CR2: 0000030341ed0050 > >>> Feb 14 02:05:52 lupus kernel: [ 70.063528] ---[ end trace > >>> 3313552d105b1535 ]--- > >>> Feb 14 02:06:16 lupus kernel: [ 93.961960] BUG: unable to handle > >>> kernel paging request at 0000030341ed0050 > >>> Feb 14 02:06:16 lupus kernel: [ 93.962171] IP: > [<ffffffff8133ef1b>] > >>> btrfs_encode_fh+0x2b/0x120 > >>> Feb 14 02:06:16 lupus kernel: [ 93.962307] PGD 0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.962430] Oops: 0000 [#2] > PREEMPT SMP > >>> Feb 14 02:06:16 lupus kernel: [ 93.962637] last sysfs file: > >>> /sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map > >>> Feb 14 02:06:16 lupus kernel: [ 93.962766] CPU 5 > >>> Feb 14 02:06:16 lupus kernel: [ 93.962812] Modules linked in: > >>> ipt_REJECT ipt_LOG xt_limit xt_tcpudp xt_state nf_nat_irc > >>> nf_conntrack_irc nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 > >>> nf_conntrack_ftp iptable_filter ipt_addrtype xt_DSCP xt_dscp > >>> xt_iprange ip_tables ip6table_filter xt_NFQUEUE xt_owner > xt_hashlimit > >>> xt_conntrack xt_mark xt_multiport xt_connmark nf_conntrack > xt_string > >>> ip6_tables x_tables it87 hwmon_vid coretemp snd_seq_dummy > snd_seq_oss > >>> snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss > >>> snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel > snd_hda_codec > >>> snd_hwdep snd_pcm snd_timer snd i2c_i801 soundcore wmi shpchp > e1000e > >>> snd_page_alloc libphy e1000 scsi_wait_scan sl811_hcd ohci_hcd ssb > >>> usb_storage ehci_hcd [last unloaded: tg3] > >>> Feb 14 02:06:16 lupus kernel: [ 93.966044] > >>> Feb 14 02:06:16 lupus kernel: [ 93.966127] Pid: 7915, comm: > >>> btrfs-transacti Tainted: G D 2.6.37-plus_v16_zcache #4 > >>> FMP55/ipower G3710 > >>> Feb 14 02:06:16 lupus kernel: [ 93.966266] RIP: > >>> 0010:[<ffffffff8133ef1b>] [<ffffffff8133ef1b>] > >>> btrfs_encode_fh+0x2b/0x120 > >>> Feb 14 02:06:16 lupus kernel: [ 93.966440] RSP: > >>> 0018:ffff88023c63b6e0 EFLAGS: 00010246 > >>> Feb 14 02:06:16 lupus kernel: [ 93.966528] RAX: 00000000000000ff > >>> RBX: ffff88023cde0168 RCX: 0000000000000000 > >>> Feb 14 02:06:16 lupus kernel: [ 93.966620] RDX: ffff88023c63b71c > >>> RSI: ffff88023c63b750 RDI: 0000000000000006 > >>> Feb 14 02:06:16 lupus kernel: [ 93.966713] RBP: 0000030341ed0000 > >>> R08: ffffffff8133eef0 R09: ffff88023c63b8c0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.966805] R10: 0000000000000003 > >>> R11: 0000000000000001 R12: 00000000ffffffff > >>> Feb 14 02:06:16 lupus kernel: [ 93.966897] R13: ffff88023cde0030 > >>> R14: ffffea0007d59bc8 R15: 0000000000000001 > >>> Feb 14 02:06:16 lupus kernel: [ 93.966990] FS: > >>> 0000000000000000(0000) GS:ffff8800bf540000(0000) > >>> knlGS:0000000000000000 > >>> Feb 14 02:06:16 lupus kernel: [ 93.967120] CS: 0010 DS: 0000 ES: > >>> 0000 CR0: 000000008005003b > >>> Feb 14 02:06:16 lupus kernel: [ 93.967209] CR2: 0000030341ed0050 > >>> CR3: 0000000001c27000 CR4: 00000000000006e0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.967302] DR0: 0000000000000000 > >>> DR1: 0000000000000000 DR2: 0000000000000000 > >>> Feb 14 02:06:16 lupus kernel: [ 93.967394] DR3: 0000000000000000 > >>> DR6: 00000000ffff0ff0 DR7: 0000000000000400 > >>> Feb 14 02:06:16 lupus kernel: [ 93.967500] Process btrfs- > transacti > >>> (pid: 7915, threadinfo ffff88023c63a000, task ffff88023c7a1620) > >>> Feb 14 02:06:16 lupus kernel: [ 93.967630] Stack: > >>> Feb 14 02:06:16 lupus kernel: [ 93.967711] 0000000000000000 > >>> 0000000000000002 0000000000000000 0000000000000003 > >>> Feb 14 02:06:16 lupus kernel: [ 93.968057] ffffea0007d59bc8 > >>> ffffffff810e6aaa 0000000000000041 0000000600000002 > >>> Feb 14 02:06:16 lupus kernel: [ 93.968348] 0000000000000000 > >>> ffffffff810e6b3a 0000000000000001 ffffffff00000001 > >>> Feb 14 02:06:16 lupus kernel: [ 93.968639] Call Trace: > >>> Feb 14 02:06:16 lupus kernel: [ 93.968728] [<ffffffff810e6aaa>] > ? > >>> cleancache_get_key+0x4a/0x60 > >>> Feb 14 02:06:16 lupus kernel: [ 93.968820] [<ffffffff810e6b3a>] > ? > >>> __cleancache_get_page+0x7a/0xd0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.968914] [<ffffffff8132e4de>] > ? > >>> __extent_read_full_page+0x52e/0x710 > >>> Feb 14 02:06:16 lupus kernel: [ 93.969008] [<ffffffff812f3f93>] > ? > >>> update_reserved_bytes+0xb3/0x140 > >>> Feb 14 02:06:16 lupus kernel: [ 93.969102] [<ffffffff81305060>] > ? > >>> btree_get_extent+0x0/0x1c0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.969193] [<ffffffff8132bb7c>] > ? > >>> merge_state+0x7c/0x150 > >>> Feb 14 02:06:16 lupus kernel: [ 93.969285] [<ffffffff81330b21>] > ? > >>> read_extent_buffer_pages+0x2d1/0x470 > >>> Feb 14 02:06:16 lupus kernel: [ 93.969378] [<ffffffff81305060>] > ? > >>> btree_get_extent+0x0/0x1c0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.969470] [<ffffffff8130674d>] > ? > >>> btree_read_extent_buffer_pages.clone.65+0x4d/0xa0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.969602] [<ffffffff813076f9>] > ? > >>> read_tree_block+0x39/0x60 > >>> Feb 14 02:06:16 lupus kernel: [ 93.969694] [<ffffffff812ed5e6>] > ? > >>> read_block_for_search.clone.40+0x116/0x410 > >>> Feb 14 02:06:16 lupus kernel: [ 93.969878] [<ffffffff812f0bc7>] > ? > >>> btrfs_search_slot+0x307/0xa00 > >>> Feb 14 02:06:16 lupus kernel: [ 93.969970] [<ffffffff812f6b18>] > ? > >>> lookup_inline_extent_backref+0x98/0x4a0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.970065] [<ffffffff810e33d7>] > ? > >>> kmem_cache_alloc+0x87/0xa0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.970157] [<ffffffff812f891c>] > ? > >>> __btrfs_free_extent+0xcc/0x6f0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.970249] [<ffffffff812f8434>] > ? > >>> update_block_group.clone.62+0xc4/0x280 > >>> Feb 14 02:06:16 lupus kernel: [ 93.970343] [<ffffffff812fc4cf>] > ? > >>> run_clustered_refs+0x39f/0x880 > >>> Feb 14 02:06:16 lupus kernel: [ 93.970436] [<ffffffff812fca77>] > ? > >>> btrfs_run_delayed_refs+0xc7/0x220 > >>> Feb 14 02:06:16 lupus kernel: [ 93.970529] [<ffffffff810e15f9>] > ? > >>> new_slab+0x169/0x1f0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.970619] [<ffffffff8130c29c>] > ? > >>> btrfs_commit_transaction+0x7c/0x760 > >>> Feb 14 02:06:16 lupus kernel: [ 93.970713] [<ffffffff81067ea0>] > ? > >>> autoremove_wake_function+0x0/0x30 > >>> Feb 14 02:06:16 lupus kernel: [ 93.970806] [<ffffffff81305bc3>] > ? > >>> transaction_kthread+0x283/0x2a0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.970898] [<ffffffff81305940>] > ? > >>> transaction_kthread+0x0/0x2a0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.970990] [<ffffffff81305940>] > ? > >>> transaction_kthread+0x0/0x2a0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.971083] [<ffffffff81067a16>] > ? > >>> kthread+0x96/0xa0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.971174] [<ffffffff81003514>] > ? > >>> kernel_thread_helper+0x4/0x10 > >>> Feb 14 02:06:16 lupus kernel: [ 93.971266] [<ffffffff81067980>] > ? > >>> kthread+0x0/0xa0 > >>> Feb 14 02:06:16 lupus kernel: [ 93.971355] [<ffffffff81003510>] > ? > >>> kernel_thread_helper+0x0/0x10 > >>> Feb 14 02:06:16 lupus kernel: [ 93.971444] Code: 55 b8 ff 00 00 > 00 > >>> 53 48 89 fb 48 83 ec 18 48 8b 6f 10 8b 3a 83 ff 04 0f 86 d5 00 00 > 00 > >>> 85 c9 0f 95 c1 83 ff 07 0f 86 d5 00 00 00 <48> 8b 45 50 bf 05 00 00 > 00 > >>> 48 89 06 84 c9 48 8b 85 68 fe ff ff > >>> Feb 14 02:06:16 lupus kernel: [ 93.974280] RIP > [<ffffffff8133ef1b>] > >>> btrfs_encode_fh+0x2b/0x120 > >>> Feb 14 02:06:16 lupus kernel: [ 93.974412] RSP > <ffff88023c63b6e0> > >>> Feb 14 02:06:16 lupus kernel: [ 93.974497] CR2: 0000030341ed0050 > >>> Feb 14 02:06:16 lupus kernel: [ 93.974599] ---[ end trace > >>> 3313552d105b1536 ]--- > >>> Feb 14 02:07:04 lupus kernel: [ 141.906124] zcache: destroyed pool > id=2 > >>> Feb 14 02:07:17 lupus kernel: [ 154.783358] SysRq : Keyboard mode > set > >>> to system default > >>> Feb 14 02:07:18 lupus kernel: [ 155.486147] SysRq : Terminate All > Tasks > >>> > >>> > >>> That's all for now > >>> > >>> Thanks & Regards > >>> > >>> Matt > >>> > >> > >> (leaving out several folks from the CC to avoid spamming - if I left > >> out someone wrongfully please re-add) > >> > >> running an addr2line reveals: > >> > >> > >> addr2line -e /usr/src/linux-2.6.37_vanilla/vmlinux -i > ffffffff81338cbb > >> export.c:0 > >> > >> > >> hope that helps > >> > >> > >> Regards > >> > >> Matt > >> > > > > Just my guessing. I might be wrong. > > > > __cleancache_flush_inode calls cleancache_get_key with > cleancache_filekey. > > cleancache_file_key's size is just 6 * u32. > > cleancache_get_key calls btrfs_encode_fh with the key. > > but btrfs_encode_fh does typecasting the key to btrfs_fid which is > > bigger size than cleancache_filekey's one so it should not access > > fields beyond cleancache_get_key. > > > > I think some file systems use extend fid so in there, this problem > can > > happen. I don't know why we can't find it earlier. Maybe Dan and > > others test it for a long time. > > > > Am I missing something? > > > > > > > > -- > > Kind regards, > > Minchan Kim > > > > reposting Minchan's message for reference to the btrfs mailing list > while also adding > > Li Zefan, Miao Xie, Yan Zheng, Dan Rosenberg and Josef Bacik to CC > > Regards > > Matt Hi Matt and Minchan -- (BTRFS EXPERTS SEE *** BELOW) I definitely see a bug in cleancache_get_key in the monolithic zcache+cleancache+frontswap patch I posted on oss.oracle.com that is corrected in linux-next but I don't see how it could get provoked by btrfs. The bug is that, in cleancache_get_key, the return value of fhfn should be checked against 255. If the return value is 255, cleancache_get_key should return -1. This should disable cleancache for any filesystem where KEY_MAX is too large. But cleancache_get_key always calls fhfn with connectable == 0 and CLEANCACHE_KEY_MAX==6 should be greater than BTRFS_FID_SIZE_CONNECTABLE (which I think should be 5?). And the elements written into the typecast btrfs_fid should be only writing the first 5 32-bit words. So if the problem is the one Minchan suggests, I am confused. Matt, can you first confirm that you are using the cleancache patches from my monolithic patch from oss.oracle.com (which I think you are)? *** Looking over the stacktrace and the code, I have an alternate theory. I wonder if it is ever possible the inode->dentry list is empty (or corrupt)? list_first_entry() assumes the list is non-empty. If this is possible and unusual, maybe my testing didn't see the problem? Thanks, Dan P.S. For those new to cleancache, the code is in linux-next here: http://git.kernel.org/?p=linux/kernel/git/sfr/linux-next.git;a=blob;f=mm/cleancache.c;h=f545eb8f11180cfb3aaf3f4f85a5255be8f9f881;hb=a57cb3bc013d2e262a663df50af6a9e7cc88bdad -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . 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