Patch not upstream: fix race between open and removal of framebuffers

Jesse Barnes jbarnes at virtuousgeek.org
Thu May 5 16:56:56 UTC 2011


On Thu, 5 May 2011 19:54:20 +0300
Anca Emanuel <anca.emanuel at gmail.com> wrote:
> I'm using 2.6.39-rc6 now
> 
> I still get:
> [   21.964367] BUG: unable to handle kernel paging request at 0000010a00000010
> [   21.964396] IP: [<ffffffff8130abe0>] fb_release+0x30/0x70
> [   21.964410] PGD 0
> [   21.964416] Oops: 0000 [#1] SMP
> [   21.964424] last sysfs file: /sys/devices/virtual/vtconsole/vtcon1/uevent
> [   21.964434] CPU 1
> [   21.964438] Modules linked in: parport_pc ppdev
> snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm
> adt7475 hwmon_vid snd_seq_midi snd_rawmidi snd_seq_midi_event nouveau
> snd_seq snd_timer snd_seq_device ttm drm_kms_helper snd intel_agp
> psmouse soundcore serio_raw intel_gtt snd_page_alloc drm i2c_algo_bit
> video lp parport pata_marvell ahci libahci r8169 mii
> [   21.964528]
> [   21.964533] Pid: 221, comm: plymouthd Not tainted 2.6.39-rc6 #7
> MICRO-STAR INTERNATIONAL CO.,LTD MS-7360/MS-7360
> [   21.964548] RIP: 0010:[<ffffffff8130abe0>]  [<ffffffff8130abe0>]
> fb_release+0x30/0x70
> [   21.964560] RSP: 0018:ffff880037211eb8  EFLAGS: 00010286
> [   21.964566] RAX: ffff880037210000 RBX: ffff88007f817000 RCX: 0000000000000001
> [   21.964573] RDX: 0000010a00000000 RSI: ffff8800370f5540 RDI: ffff88007f817008
> [   21.964580] RBP: ffff880037211ec8 R08: 0000000000000000 R09: 0000000000000000
> [   21.964588] R10: ffff8800370f5550 R11: 0000000000000246 R12: ffff88007f817008
> [   21.964595] R13: ffff88007d3db540 R14: ffff88007be34d90 R15: ffff88007be34d90
> [   21.964604] FS:  00007fb335025720(0000) GS:ffff88007fc80000(0000)
> knlGS:0000000000000000
> [   21.964739] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [   21.964746] CR2: 0000010a00000010 CR3: 000000007b41a000 CR4: 00000000000006e0
> [   21.964754] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [   21.964762] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [   21.964770] Process plymouthd (pid: 221, threadinfo
> ffff880037210000, task ffff880036cd16c0)
> [   21.964778] Stack:
> [   21.964782]  ffff8800370f5540 0000000000000008 ffff880037211f18
> ffffffff8115cfaa
> [   21.964797]  ffff8800370f5550 ffff8800793c7b00 ffff88006744fcd0
> ffff8800370f5540
> [   21.964811]  ffff88007c3b9080 0000000000000000 000000000000000b
> 0000000000000000
> [   21.964825] Call Trace:
> [   21.964834]  [<ffffffff8115cfaa>] fput+0xea/0x220
> [   21.964842]  [<ffffffff811591f6>] filp_close+0x66/0x90
> [   21.964849]  [<ffffffff811597c7>] sys_close+0xb7/0x120
> [   21.964858]  [<ffffffff815b3002>] system_call_fastpath+0x16/0x1b
> [   21.964865] Code: 83 ec 10 48 89 1c 24 4c 89 64 24 08 0f 1f 44 00
> 00 48 8b 9e a0 00 00 00 4c 8d 63 08 4c 89 e7 e8 d7 ea 29 00 48 8b 93
> b8 03 00 00
> [   21.964944]  8b 42 10 48 85 c0 74 11 be 01 00 00 00 48 89 df ff d0 48 8b
> [   21.964983] RIP  [<ffffffff8130abe0>] fb_release+0x30/0x70
> [   21.964992]  RSP <ffff880037211eb8>
> [   21.964997] CR2: 0000010a00000010
> 
> I can use de PC, but when it wake up from S3, hangs.
> full dmesg at: http://pastebin.com/rhMJrF2x
> uname -a
> Linux ubuntu 2.6.39-rc6 #7 SMP Wed May 4 12:26:39 EEST 2011 x86_64
> x86_64 x86_64 GNU/Linux
> 
> I read that Ubuntu have something like 150 patches NOT upstreamed. Why ?
> And other guys complaining about the hard work they do to maintain
> stable and mainline.
> 
> If you not upstream your work, then what is the ideea ? Keep it only
> for Ubuntu users ?
> 
> I have the latest Linus git tree, and I applied the patch like this:
> wget http://is.gd/otIfGc
> git apply otIfGc
> 
> Linus, if nobody ask you, please apply the patch.
> With Tested-by: Anca Emanuel <anca.emanuel at gmail.com>
> 
> full dmesg after the patch: http://pastebin.com/XtNXzgPc
> Tested sleep and wake up from S3.

Yeah, I'd like to see this fixed too.  Without it, everyone on
the latest Ubuntu release will see this bug whenever they try to boot
an upstream kernel.

-- 
Jesse Barnes, Intel Open Source Technology Center



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