linux-kernel - [mnt_hash] BUG: unable to handle kernel paging request at ffffffff81176112

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Date:	Fri, 21 Mar 2014 20:57:59 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [mnt_hash] BUG: unable to handle kernel paging request at
 ffffffff81176112

Al, here is one more bug behave.

[    2.343741] Freeing unused kernel memory: 1832K (ffff880001a36000 - ffff880001c00000)
[    2.352128] Freeing unused kernel memory: 876K (ffff880001f25000 - ffff880002000000)
Kernel tests: Boot OK!
[  239.242134] BUG: unable to handle kernel paging request at ffffffff81176112
[  239.244901] IP: [<ffffffff811771a2>] dentry_kill.isra.25+0xd0/0x2cb
[  239.246061] PGD 2015067 PUD 2016063 PMD 10001e1 
[  239.246061] Oops: 0003 [#1] 
[  239.246061] Modules linked in:
[  239.246061] CPU: 0 PID: 360 Comm: umount Not tainted 3.14.0-rc7-00096-g77a67cc #27
[  239.246061] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  239.246061] task: ffff88000e25ece0 ti: ffff88000e32e000 task.ti: ffff88000e32e000
[  239.246061] RIP: 0010:[<ffffffff811771a2>]  [<ffffffff811771a2>] dentry_kill.isra.25+0xd0/0x2cb
[  239.246061] RSP: 0018:ffff88000e32fea0  EFLAGS: 00010202
[  239.246061] RAX: ffffffff81176112 RBX: ffff88000efd1d50 RCX: ffff88000e7deab8
[  239.246061] RDX: ffff88000e7deab8 RSI: ffffffff8117f37f RDI: ffff88000efd1d50
[  239.246061] RBP: ffff88000e32feb8 R08: 00000000ffffffff R09: 0000000000000000
[  239.246061] R10: 0000000000737470 R11: ffff88000e330025 R12: ffff88000e7deb90
[  239.246061] R13: ffff88000ec075d0 R14: 0000000000000000 R15: ffff88000e7dea80
[  239.246061] FS:  00007f616965c700(0000) GS:ffffffff82030000(0000) knlGS:0000000000000000
[  239.246061] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  239.246061] CR2: ffffffff81176112 CR3: 000000000e255000 CR4: 00000000000006f0
[  239.246061] Stack:
[  239.246061]  ffff88000efd1d50 ffff88000e7deb90 ffff88000e7dea80 ffff88000e32fed0
[  239.246061]  ffffffff811779c8 ffff88000e7deb90 ffff88000e32fee8 ffffffff81168638
[  239.246061]  ffff88000e7dea80 ffff88000e32ff08 ffffffff8117fda2 ffff88000e7deaa0
[  239.246061] Call Trace:
[  239.246061]  [<ffffffff811779c8>] dput+0x184/0x1b8
[  239.246061]  [<ffffffff81168638>] path_put+0x18/0x31
[  239.246061]  [<ffffffff8117fda2>] namespace_unlock+0xb8/0xd1
[  239.246061]  [<ffffffff81181f09>] SyS_umount+0x4a4/0x4f2
[  239.246061]  [<ffffffff8113c9db>] ? vm_munmap+0x5d/0x72
[  239.246061]  [<ffffffff81a28bb7>] system_call_fastpath+0x16/0x1b
[  239.246061] Code: ff 05 23 cf 3c 01 e8 dc dd ff ff 48 ff 05 1f cf 3c 01 48 ff 05 00 af 3c 01 48 8b 83 98 00 00 00 48 8b 93 90 00 00 00 48 89 42 08 <48> 89 10 48 b8 00 01 10 00 00 00 ad de 48 89 83 90 00 00 00 81 
[  239.246061] RIP  [<ffffffff811771a2>] dentry_kill.isra.25+0xd0/0x2cb
[  239.246061]  RSP <ffff88000e32fea0>
[  239.246061] CR2: ffffffff81176112
[  239.246061] ---[ end trace 79edd28e8cfd526a ]---
[  239.246061] Kernel panic - not syncing: Fatal exception

git bisect start 77a67cc34b63c0f868f0bb66e7c23dd2743b2d97 dcb99fd9b08cfe1afe426af4d8d3cbc429190f15 --
git bisect  bad fca1d772b6e12a5e5e3e5749f8b06650aeecbc6c  # 12:05     13-      3  Merge 'vfs/untested-mnt_hash' into devel-cairo-x86_64-201403211021
git bisect good 92fef99b88a854a6dbfd25fb1c4305662a182452  # 12:16     85+      0  0day base guard for 'devel-cairo-x86_64-201403211021'
git bisect good 8a21d9f63dd47485964b930af41304d88dee0e9b  # 13:03     85+      1  Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
git bisect good ea1cd65a648bd98ff9d028a647462d28313aadfd  # 13:25     85+      1  Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 887843961c4b4681ee993c36d4997bf4b4aa8253  # 13:58     85+      2  mm: fix bad rss-counter if remap_file_pages raced migration
git bisect good 8cefb970aa3b94377554d5083611768ff257ce19  # 14:11     85+      0  resizable namespace.c hashes
git bisect  bad 3d54406d3c64c0e7e092f8299c460ebe0aea9795  # 14:41     25-      5  switch mnt_hash to hlist
git bisect good 6a92faa1d647d78ec54506d783c5a7ce503b4843  # 15:25    103+      0  smarter propagate_mnt()
# first bad commit: [3d54406d3c64c0e7e092f8299c460ebe0aea9795] switch mnt_hash to hlist
git bisect good 6a92faa1d647d78ec54506d783c5a7ce503b4843  # 16:09    309+      3  smarter propagate_mnt()
git bisect  bad 77a67cc34b63c0f868f0bb66e7c23dd2743b2d97  # 16:09      0-     15  0day head guard for 'devel-cairo-x86_64-201403211021'
git bisect good 08edb33c4e1b810011f21d7705811b7b9a0535f0  # 17:05    309+      1  Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
git bisect good 06ed26d1de59ce7cbbe68378b7e470be169750e5  # 17:49    309+      0  Add linux-next specific files for 20140321

Thanks,
Fengguang

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