Date:	Thu, 12 May 2011 21:03:39 +0300
From:	Amir Goldstein <amir73il@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Theodore Tso <tytso@....edu>
Subject: Re: testing ext4 master branch

On Thu, May 12, 2011 at 7:27 PM, Amir Goldstein <amir73il@...il.com> wrote:
> 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):
>

FYI, this crash reproduced the second time I tried to run the test.
Now building kernel 2.6.39-rc7 (without ext4 master branch changes).
If my remote server doesn't hang over the weekend I will let you know
the test result.

>
> [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.
>
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