linux-kernel - oops in fs/dcache.c:536 with 3.4.107

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Date:	Wed, 20 May 2015 17:03:15 -0700
From:	Daniel Wittmer <wittmer@...gle.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alan Thompson <alant@...gle.com>
Subject: oops in fs/dcache.c:536 with 3.4.107

Hi all,

We've recently started to encounter the below oops in fs/dcache.c:536
on a few machines running 3.4.107. Looking into changes to dcache.h/c
and fs/namei.c I'm not seeing any changes that may have caused or
addressed this issue.

Is this a known oops? Is there a fix in later versions that I may have missed?

Thanks in advance,
Dan

------------[ cut here ]------------
kernel BUG at fs/dcache.c:536!
invalid opcode: 0000 [#1] SMP
CPU 1
Modules linked in:

Pid: 22588, comm: <snip> Not tainted 3.4.107<snip>
RIP: 0010:[<ffffffff810eaf8e>]  [<ffffffff810eaf8e>] dput+0x1be/0x1c0
RSP: 0018:ffff8817c24cdc18  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88183683ac48 RCX: 0000000000006564
RDX: 0000000000006464 RSI: 0000000000000011 RDI: ffff88183683aca8
RBP: ffff8817c24cdc38 R08: 0000000000000000 R09: ffff88183682df08
R10: ffff88183682ded0 R11: 0000000000000009 R12: ffff88177229c3f5
R13: ffff8818368e7d20 R14: ffff88183683aca8 R15: 0000000000000003
FS:  00007feaade39700(0000) GS:ffff88183f220000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feabdec6000 CR3: 000000170ed8f000 CR4: 00000000000407e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process longplanner_wor (pid: 22588, threadinfo ffff8817c24cc000, task
ffff8817c1df8080)
Stack:
ffff8817c24cddc8 ffff88177229c3f5 ffff8818368e7d20 ffff8817c1df8080
ffff8817c24cdcf8 ffffffff810e1569 ffff88183683ac48 ffff88183683aca8
ffff8817c39c79c0 ffff88183683ac48 ffff8817c24cdc78 ffff8817c1df8080
Call Trace:
 [<ffffffff810e1569>] link_path_walk+0x2a9/0x8a0
 [<ffffffff810e24bf>] path_lookupat+0x36f/0x6f0
 [<ffffffff810e286b>] do_path_lookup+0x2b/0x70
 [<ffffffff810e4154>] user_path_at_empty+0x54/0xa0
 [<ffffffff810d9874>] ? cp_new_stat+0xf4/0x110
 [<ffffffff810e41ac>] user_path_at+0xc/0x10
 [<ffffffff810d9a15>] vfs_fstatat+0x35/0x60
 [<ffffffff810d9a76>] vfs_stat+0x16/0x20
 [<ffffffff810d9b85>] sys_newstat+0x15/0x30
 [<ffffffff814e42a2>] system_call_fastpath+0x16/0x1b
Code: 00 48 8d 90 20 01 00 00 48 89 93 a0 00 00 00 4c 89 a0 20 01 00
00 48 8b 83 80 00 00 00 83 80 30 01 00 00 01 e8 24 89 3f 00 eb 8b <0f>
0b 55 48 89 e5 41 57 41 56 4c 8d 7f 78 49 89 fe 41 55 4c 8d
RIP  [<ffffffff810eaf8e>] dput+0x1be/0x1c0
 RSP <ffff8817c24cdc18>
---[ end trace 835aa73d3e65f5b3 ]---
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