Hi Jan, During testing of Ted's master branch merged with 2.6.39-rc7, I encountered 2 errors, before the system was hung. One error is consistent in xfstest 005 (Test symlinks & ELOOP): QA output created by 005 *** touch deep symlinks No ELOOP? Unexpected! *** touch recusive symlinks ELOOP returned. Good. The other error is critical and you may be able to provide some input: while running xfstest 232 (Run fsstress with quotas enabled and verify accounted quotas in the end): [18339.351033] EXT4-fs (sda8): mounted filesystem with ordered data mode. Opts: acl,user_xattr,usrquota,grpquota [18339.386612] EXT4-fs (sda8): re-mounted. Opts: (null) [18339.397322] EXT4-fs (sda8): re-mounted. Opts: (null) [18406.012595] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 [18406.012664] IP: [<ffffffff8122e202>] ext4_quota_off+0x42/0xd0 [18406.012711] PGD 0 [18406.012730] Oops: 0000 [#1] SMP [18406.012810] CPU 2 [18406.012826] Modules linked in: next4 binfmt_misc parport_pc ppdev snd_hda_codec_realtek snd_hda_intel snd_hda_codec i915 snd_hwdep drm_kms_helper snd_pcm snd_seq_midi drm firewire_ohci firewire_core usbhid snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd e1000e psmouse tpm_tis serio_raw lp i2c_algo_bit hid tpm intel_agp pata_marvell parport soundcore crc_itu_t tpm_bios intel_gtt video snd_page_alloc [18406.013187] [18406.013201] Pid: 26309, comm: quotaon Tainted: G M 2.6.39-rc7+ #6 /DQ35JO [18406.013269] RIP: 0010:[<ffffffff8122e202>] [<ffffffff8122e202>] ext4_quota_off+0x42/0xd0 [18406.013325] RSP: 0018:ffff88011cd57e28 EFLAGS: 00010292 [18406.013361] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000018 [18406.013406] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000246 [18406.013451] RBP: ffff88011cd57e48 R08: 0000000000000001 R09: 0000000000000000 [18406.013497] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800ca9b8800 [18406.013541] R13: ffff8800ca9b8800 R14: 0000000000000001 R15: 0000000000000000 [18406.013587] FS: 00007f602698b720(0000) GS:ffff88012bd00000(0000) knlGS:0000000000000000 [18406.013639] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [18406.013676] CR2: 0000000000000018 CR3: 000000011332b000 CR4: 00000000000006e0 [18406.013721] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [18406.013766] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [18406.013812] Process quotaon (pid: 26309, threadinfo ffff88011cd56000, task ffff880111bddee0) [18406.013864] Stack: [18406.013880] 0000000000800003 0000000000000001 ffff8800ca9b8800 00000000ffffffda [18406.013939] ffff88011cd57ef8 ffffffff811c9e05 0000000000000000 0000000000000000 [18406.013998] ffff88011cd57e78 ffff8800ca9b8868 ffff880124621e00 ffff8800ca9b8868 [18406.014057] Call Trace: [18406.014079] [<ffffffff811c9e05>] do_quotactl+0x4e5/0x560 [18406.014118] [<ffffffff815d2b1c>] ? down_read+0x4c/0x70 [18406.014155] [<ffffffff811711cf>] ? get_super+0x9f/0xd0 [18406.014190] [<ffffffff81189f78>] ? iput+0x48/0x200 [18406.014224] [<ffffffff811c9f4c>] sys_quotactl+0xcc/0x1a0 [18406.014260] [<ffffffff8116be26>] ? filp_close+0x66/0x90 [18406.014298] [<ffffffff812fcb1e>] ? trace_hardirqs_on_thunk+0x3a/0x3f [18406.014343] [<ffffffff815dc642>] system_call_fastpath+0x16/0x1b [18406.014382] Code: 89 74 24 18 0f 1f 44 00 00 48 63 c6 49 89 fc 41 89 f6 48 8b 9c c7 60 03 00 00 48 8b 87 90 04 00 00 f6 40 73 08 0f 85 7e 00 00 00 [18406.014601] 8b 7b 18 be 01 00 00 00 e8 c0 fb ff ff 48 3d 00 f0 ff ff 49 [18406.014712] RIP [<ffffffff8122e202>] ext4_quota_off+0x42/0xd0 [18406.014756] RSP <ffff88011cd57e28> [18406.014780] CR2: 0000000000000018 [18406.079351] ---[ end trace 2924f13a8b419b9a ]--- The test was hung at quotacheck -u -g for a long time, so I dumped waiting tasks and got: [21278.671419] SysRq : Show Blocked State [21278.671427] task PC stack pid father [21278.671457] quotacheck D 00000001001ba0b0 0 26321 26123 0x00000000 [21278.671464] ffff8801123f7da8 0000000000000046 ffff8801123f7df8 0000000017059fa0 [21278.671472] ffff880100000000 ffff8801123f7fd8 ffff8801123f6000 ffff8801123f7fd8 [21278.671480] ffff880124f43f40 ffff880117059fa0 ffff8800ca9b8870 00000001ca9b8868 [21278.671487] Call Trace: [21278.671498] [<ffffffff815d3775>] rwsem_down_failed_common+0xc5/0x160 [21278.671504] [<ffffffff815d3823>] rwsem_down_write_failed+0x13/0x20 [21278.671511] [<ffffffff812fca83>] call_rwsem_down_write_failed+0x13/0x20 [21278.671517] [<ffffffff811904ce>] ? do_mount+0x21e/0x7e0 [21278.671523] [<ffffffff815d2ac5>] ? down_write+0x65/0x70 [21278.671527] [<ffffffff811904ce>] ? do_mount+0x21e/0x7e0 [21278.671532] [<ffffffff811904ce>] do_mount+0x21e/0x7e0 [21278.671537] [<ffffffff812fce81>] ? strncpy_from_user+0x31/0x40 [21278.671543] [<ffffffff81179dd4>] ? getname_flags+0x74/0x240 [21278.671548] [<ffffffff81190e50>] sys_mount+0x90/0xe0 [21278.671554] [<ffffffff815dc642>] system_call_fastpath+0x16/0x1b I have had problems running xfstests on my machine (now Ubuntu 11.4). umount keep failing on some specific tests (sometimes) and reporting: +umount: /mnt/test/scratch: device is busy. + (In some cases useful info about processes that use + the device is found by lsof(8) or fuser(1)) Naturally, those partitions are dedicated for xfstests. I was never able to solve this problem so I set USE_REMOUNT=1 to avoid umount at least on the TEST partition. Any ideas? Amir. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
