PROBLEM: 3.6.0 kernel BUG at fs/dcache.c:967 during shutdown / restart

[Neil Salstrom]

I've not submitted a kernel bug before but I've read the bug reporting 
pages.  I'll try to do my best and if you need more information please 
let me know.  Please feel free to cc me on the answer or if you have 
questions.

I'm using Linux Mint 13 (64 bit) on AMD hardware with a self compiled 
3.6.0 kernel for my MythTV HTPC.

Kernel version: Linux version 3.6.0 (gcc version 4.6.3 (Ubuntu/Linaro 
4.6.3-1ubuntu5) ) #1 SMP Tue Oct 2 15:34:46 PDT 2012

CPU: model name      : AMD A6-3500 APU with Radeon(tm) HD Graphics

If you need any other system variables please let me know and I can get 
those as well.

Upon shutdown or restart (from either the hard button on the case or a 
"sudo shutdown -r now" the system crashes and does not actually shut 
down.  I can ssh in to the system and a dmesg shows the following:

[102792.710563] ------------[ cut here ]------------
[102792.710564] kernel BUG at fs/dcache.c:967!
[102792.710566] invalid opcode: 0000 [#1] SMP
[102792.710568] Modules linked in: nls_utf8 udf crc_itu_t nfsv4 
binfmt_misc nfsd nfs_acl auth_rpcgss nfs fscache lockd sunrpc 
snd_hda_codec_hdmi xfs nvidia(PO) rc_imon_mce imon rc_core 
snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_seq_midi snd_hwdep 
snd_rawmidi snd_pcm psmouse snd_seq_midi_event snd_seq serio_raw 
snd_seq_device snd_timer snd soundcore snd_page_alloc f71882fg r8169 
ahci libahci
[102792.710587] CPU 0
[102792.710590] Pid: 29771, comm: umount Tainted: P           O 3.6.0 #1 
System manufacturer System Product Name/F1A55-M LX PLUS
[102792.710592] RIP: 0010:[<ffffffff8116c606>] [<ffffffff8116c606>] 
shrink_dcache_for_umount_subtree+0x1e6/0x1f0
[102792.710598] RSP: 0018:ffff880118f6dd98  EFLAGS: 00010296
[102792.710600] RAX: 000000000000005d RBX: ffff88011092acc0 RCX: 
00000000000013ae
[102792.710601] RDX: 0000000000004663 RSI: 0000000000000046 RDI: 
ffffffff81bbf9bc
[102792.710602] RBP: ffff880118f6ddb8 R08: 000000000000000a R09: 
0000000000000000
[102792.710604] R10: 000000000000039a R11: 0000000000000399 R12: 
ffff880110a5c900
[102792.710605] R13: ffff880118fa9d00 R14: ffff880118fa9d30 R15: 
ffff8801180c9000
[102792.710607] FS:  00007f9cc4c16800(0000) GS:ffff88011ec00000(0000) 
knlGS:0000000000000000
[102792.710608] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[102792.710609] CR2: 00007f9cc4241120 CR3: 0000000117993000 CR4: 
00000000000007f0
[102792.710611] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[102792.710612] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 
0000000000000400
[102792.710614] Process umount (pid: 29771, threadinfo ffff880118f6c000, 
task ffff88007b8edb00)
[102792.710614] Stack:
[102792.710616]  ffff8801180c9350 ffff880110a5c6c0 ffff8801180c9000 
ffffffffa0d0f3c0
[102792.710618]  ffff880118f6ddd8 ffffffff8116de93 0000000000000001 
ffff8801180c9000
[102792.710620]  ffff880118f6de08 ffffffff811583bc ffff880110a5c760 
0000000000000014
[102792.710622] Call Trace:
[102792.710626]  [<ffffffff8116de93>] shrink_dcache_for_umount+0x33/0x60
[102792.710629]  [<ffffffff811583bc>] generic_shutdown_super+0x2c/0xf0
[102792.710632]  [<ffffffff81158516>] kill_anon_super+0x16/0x30
[102792.710634]  [<ffffffff81158557>] kill_litter_super+0x27/0x30
[102792.710650]  [<ffffffffa0d094a9>] rpc_kill_sb+0x99/0xc0 [sunrpc]
[102792.710653]  [<ffffffff8115877c>] deactivate_locked_super+0x3c/0xa0
[102792.710655]  [<ffffffff8115938e>] deactivate_super+0x4e/0x70
[102792.710658]  [<ffffffff81174416>] mntput_no_expire+0x106/0x160
[102792.710661]  [<ffffffff8117543e>] sys_umount+0x6e/0x3b0
[102792.710664]  [<ffffffff81583d96>] system_call_fastpath+0x1a/0x1f
[102792.710665] Code: 00 00 48 8b 40 28 4c 8b 08 48 8b 43 30 48 85 c0 74 
04 48 8b 50 40 48 89 34 24 48 c7 c7 48 69 7c 81 48 89 de 31 c0 e8 09 62 
40 00 <0f> 0b 0f 0b 66 0f 1f 44 00 00 55 48 89 e5 41 54 53 66 66 66 66
[102792.710686] RIP  [<ffffffff8116c606>] 
shrink_dcache_for_umount_subtree+0x1e6/0x1f0
[102792.710689]  RSP <ffff880118f6dd98>
[102792.710705] ---[ end trace 6cebf99f8c65907b ]---

Thank you,

Neil



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