[Bug 54226] [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54226

--- Comment #91 from LongerDev <longerdev at gmail.com> ---
I tried it patch on linux-3.11_rc1, but when X starting I see:
791966 Jul 21 16:17:07 localhost kernel: [   19.320879] BUG: unable to handle
kernel NULL pointer dereference at 0000000000000010
791967 Jul 21 16:17:07 localhost kernel: [   19.320948] IP:
[<ffffffff8136bfc0>] gen6_add_request+0xe7/0x178
791968 Jul 21 16:17:07 localhost kernel: [   19.320995] PGD b0d80067 PUD
b0c18067 PMD 0
791969 Jul 21 16:17:07 localhost kernel: [   19.321031] Oops: 0000 [#1] PREEMPT
SMP
791970 Jul 21 16:17:07 localhost kernel: [   19.321064] Modules linked in:
snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec brcmsmac
snd_hwdep snd_p       cm cordic brcmutil bcma snd_page_alloc snd_timer snd
soundcore
791971 Jul 21 16:17:07 localhost kernel: [   19.321209] CPU: 0 PID: 2696 Comm:
X Not tainted 3.11.0-rc1 #1
791972 Jul 21 16:17:07 localhost kernel: [   19.321249] Hardware name: SAMSUNG
ELECTRONICS CO., LTD. SF311/SF411/SF511/SF311/SF411/SF511, BIOS
06HW.M011.20110503.SCY 05       /03/2011
791973 Jul 21 16:17:07 localhost kernel: [   19.321322] task: ffff8800b1c07590
ti: ffff8800b0c24000 task.ti: ffff8800b0c24000
791974 Jul 21 16:17:07 localhost kernel: [   19.321370] RIP:
0010:[<ffffffff8136bfc0>]  [<ffffffff8136bfc0>] gen6_add_request+0xe7/0x178
791975 Jul 21 16:17:07 localhost kernel: [   19.321426] RSP:
0018:ffff8800b0c25bc8  EFLAGS: 00010286
791976 Jul 21 16:17:07 localhost kernel: [   19.321461] RAX: 0000000000000000
RBX: ffff8800b1c3d4d8 RCX: 0000000000027330
791977 Jul 21 16:17:07 localhost kernel: [   19.321506] RDX: 0000000000000080
RSI: ffffc900045c003c RDI: ffffc900045c0038
791978 Jul 21 16:17:07 localhost kernel: [   19.321550] RBP: ffff8800b0c25c08
R08: ffff8800b0d97f00 R09: 00000000000145c0
791979 Jul 21 16:17:07 localhost kernel: [   19.321594] R10: 0000000000001000
R11: ffff8800b1c3c000 R12: 0000000000000000
791980 Jul 21 16:17:07 localhost kernel: [   19.321638] R13: 0000000000002044
R14: 0000000000000000 R15: ffff8800b1c3c000
791981 Jul 21 16:17:07 localhost kernel: [   19.321682] FS: 
00007ff167ae8880(0000) GS:ffff880100200000(0000) knlGS:0000000000000000
791982 Jul 21 16:17:07 localhost kernel: [   19.321732] CS:  0010 DS: 0000 ES:
0000 CR0: 0000000080050033
791983 Jul 21 16:17:07 localhost kernel: [   19.321767] CR2: 0000000000000010
CR3: 00000000b1cc9000 CR4: 00000000000407f0
791984 Jul 21 16:17:07 localhost kernel: [   19.321810] Stack:
791985 Jul 21 16:17:07 localhost kernel: [   19.321824]  ffff8800b1c3d4d8
0000000000000000 ffff8800aff24000 0000000000000000
791986 Jul 21 16:17:07 localhost kernel: [   19.321876]  ffff8800b1c3c000
ffff8800b0d97f00 ffff8800b1f66a00 ffff8800b1c3d4d8
791987 Jul 21 16:17:07 localhost kernel: [   19.321927]  ffff8800b0c25c68
ffffffff81334b11 ffff880000000028 0000000000000000
791988 Jul 21 16:17:07 localhost kernel: [   19.321979] Call Trace:
791989 Jul 21 16:17:07 localhost kernel: [   19.322000]  [<ffffffff81334b11>]
__i915_add_request+0x6d/0x215
791990 Jul 21 16:17:07 localhost kernel: [   19.322045]  [<ffffffff8133b8d9>]
i915_gem_do_execbuffer.isra.14+0xd07/0xdc5
791991 Jul 21 16:17:07 localhost kernel: [   19.322089]  [<ffffffff8133bd5e>] ?
i915_gem_execbuffer2+0x5d/0x1e3
791992 Jul 21 16:17:07 localhost kernel: [   19.322128]  [<ffffffff8133be5a>]
i915_gem_execbuffer2+0x159/0x1e3
791993 Jul 21 16:17:07 localhost kernel: [   19.322170]  [<ffffffff8130e167>]
drm_ioctl+0x302/0x446
791994 Jul 21 16:17:07 localhost kernel: [   19.322204]  [<ffffffff8133bd01>] ?
i915_gem_execbuffer+0x36a/0x36a
791995 Jul 21 16:17:07 localhost kernel: [   19.322245]  [<ffffffff8102a823>] ?
__do_page_fault+0x34f/0x3f3
791996 Jul 21 16:17:07 localhost kernel: [   19.322285]  [<ffffffff810d3621>]
vfs_ioctl+0x21/0x34
791997 Jul 21 16:17:07 localhost kernel: [   19.322317]  [<ffffffff810d3e7a>]
do_vfs_ioctl+0x3b8/0x3fb
791998 Jul 21 16:17:07 localhost kernel: [   19.322353]  [<ffffffff810dbab9>] ?
fget_light+0xa1/0xb8
791999 Jul 21 16:17:07 localhost kernel: [   19.322387]  [<ffffffff810d3efd>]
SyS_ioctl+0x40/0x6b
792000 Jul 21 16:17:07 localhost kernel: [   19.322420]  [<ffffffff816450d2>]
system_call_fastpath+0x16/0x1b
792001 Jul 21 16:17:07 localhost kernel: [   19.322457] Code: e8 d4 c0 f0 ff 8b
73 2c 44 89 ef 83 c6 04 89 73 2c 48 03 73 10 e8 bf c0 f0 ff 8b 73 2c 48 8b 45
c8 83 c6 0       4 89 73 2c 48 03 73 10 <8b> 78 10 83 ef 80 e8 a3 c0 f0 ff 83
43 2c 04 49 ff c4 49 83 fc
792002 Jul 21 16:17:07 localhost kernel: [   19.322688] RIP 
[<ffffffff8136bfc0>] gen6_add_request+0xe7/0x178
792003 Jul 21 16:17:07 localhost kernel: [   19.322728]  RSP <ffff8800b0c25bc8>
792004 Jul 21 16:17:07 localhost kernel: [   19.322750] CR2: 0000000000000010
792005 Jul 21 16:17:07 localhost kernel: [   19.330669] ---[ end trace
b13215eb98a2df5f ]---

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