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 -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>