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Date: Thu, 20 May 2010 08:55:20 -0400 From: Andrew Morton <akpm@...ux-foundation.org> To: Valdis.Kletnieks@...edu Cc: linux-kernel@...r.kernel.org, Dmitry Torokhov <dtor@...l.ru> Subject: Re: mmotm 2010-05-19 BUG weirdness... On Thu, 20 May 2010 11:47:50 -0400 Valdis.Kletnieks@...edu wrote: > On Wed, 19 May 2010 16:13:09 PDT, akpm@...ux-foundation.org said: > > The mm-of-the-moment snapshot 2010-05-19-16-12 has been uploaded to > > > > http://userweb.kernel.org/~akpm/mmotm/ > > So I'm looking closer at the BUG I just posted I can't see that BUG report on lkml or in inbox. > - I had deleted two further > BUGs because they were obviously follow-ons to the original. But then... > > Note the following 2 lines: > > [ 35.357018] note: keymap[2481] exited with preempt_count 1 > [ 35.360503] BUG: scheduling while atomic: keymap/2481/0x10000002 > > The kernel reports the instigating process exited - and then reports it as > the offender for a "scheduling while atomic". Insufficient attempted cleanup > after the first BUG? Do we care because this is a sign of a scheduler bug > that could trip on a non-BUG as well, or is it "all bets are off" because of > the first BUG? Yes, the oops code will end up calling do_exit() to get rid of this process and to try to keep the machine limping along. So if you hit an oops with (say) a spinlock held, the task will end up calling do_exit() with a non-zero preempt_count. So the only problem I'm seeing here is .... Dmitry's ;) > [ 35.294528] BUG: unable to handle kernel NULL pointer dereference at (null) > [ 35.295005] IP: [<(null)>] (null) > [ 35.296935] PGD 11da3c067 PUD 11d4ad067 PMD 0 > [ 35.296935] Oops: 0010 [#1] PREEMPT SMP > [ 35.299667] last sysfs file: /sys/devices/pci0000:00/0000:00:1a.7/usb1/idVendor > [ 35.300328] CPU 0 > [ 35.300328] Modules linked in: > [ 35.300328] > [ 35.300328] Pid: 2481, comm: keymap Not tainted 2.6.34-mmotm0519 #1 0X564R/Latitude E6500 > [ 35.300328] RIP: 0010:[<0000000000000000>] [<(null)>] (null) > [ 35.300328] RSP: 0018:ffff88011d4d5cb0 EFLAGS: 00010046 > [ 35.310163] RAX: 0000000000000000 RBX: ffff88011c03e000 RCX: 0000000000000081 > [ 35.310163] RDX: ffff88011d4d5cc4 RSI: ffff88011d4d5cc8 RDI: ffff88011c03e000 > [ 35.310163] RBP: ffff88011d4d5d28 R08: ffff88011e9b28e8 R09: 0000000000000001 > [ 35.310163] R10: ffffffff81e0b160 R11: 0000000000000004 R12: 00000000000000a4 > [ 35.310163] R13: ffff88011c03e830 R14: 0000000000000286 R15: ffff88011d4d5cc8 > [ 35.310163] FS: 00007f4b86283700(0000) GS:ffff880002600000(0000) knlGS:0000000000000000 > [ 35.319397] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 35.319397] CR2: 0000000000000000 CR3: 000000011d575000 CR4: 00000000000406f0 > [ 35.319397] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 35.319397] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > [ 35.319397] Process keymap (pid: 2481, threadinfo ffff88011d4d4000, task ffff88011e9b28c0) > [ 35.319397] Stack: > [ 35.319397] ffffffff813bf3d1 ffff88011d4d5cf8 0000008100000246 00000081000000a4 > [ 35.319397] <0> 0000000000000004 0000000000000000 ffff88011d4d5cc4 ffff88011cf11200 > [ 35.319397] <0> ffff88011c179000 ffff88011d4d5d28 0000000000000081 00007fff9ee21fa0 > [ 35.319397] Call Trace: > [ 35.319397] [<ffffffff813bf3d1>] ? input_set_keycode+0xad/0x12c > [ 35.319397] [<ffffffff813c231d>] evdev_do_ioctl+0x22b/0x79b > [ 35.337913] [<ffffffff815a4b04>] ? __mutex_lock_common+0x564/0x580 > [ 35.337913] [<ffffffff813c28ca>] ? evdev_ioctl_handler+0x3d/0x80 > [ 35.341507] [<ffffffff813c28ca>] ? evdev_ioctl_handler+0x3d/0x80 > [ 35.341507] [<ffffffff813c28f0>] evdev_ioctl_handler+0x63/0x80 > [ 35.344034] [<ffffffff813c292a>] evdev_ioctl+0xb/0xd > [ 35.344034] [<ffffffff810ea6cd>] vfs_ioctl+0x2d/0xa1 > [ 35.344034] [<ffffffff810eac4c>] do_vfs_ioctl+0x494/0x4cd > [ 35.344034] [<ffffffff810eacdc>] sys_ioctl+0x57/0x95 > [ 35.344034] [<ffffffff8100266b>] system_call_fastpath+0x16/0x1b > [ 35.344034] Code: Bad RIP value. > [ 35.344034] RIP [<(null)>] (null) > [ 35.344034] RSP <ffff88011d4d5cb0> > [ 35.344034] CR2: 0000000000000000 > [ 35.357018] ---[ end trace 394fa5aa8a77b6f3 ]--- > [ 35.357018] note: keymap[2481] exited with preempt_count 1 > [ 35.360503] BUG: scheduling while atomic: keymap/2481/0x10000002 > [ 35.361774] INFO: lockdep is turned off. > [ 35.363106] Modules linked in: > [ 35.364442] Pid: 2481, comm: keymap Tainted: G D 2.6.34-mmotm0519 #1 > [ 35.365759] Call Trace: > [ 35.367082] [<ffffffff810653af>] ? __debug_show_held_locks+0x1b/0x24 > [ 35.368391] [<ffffffff8102e742>] __schedule_bug+0x6d/0x72 > [ 35.369716] [<ffffffff815a34de>] schedule+0x10a/0x902 > [ 35.371012] [<ffffffff81030b30>] __cond_resched+0x13/0x1f > [ 35.372305] [<ffffffff815a3dfa>] _cond_resched+0x16/0x1d > [ 35.373576] [<ffffffff810c3f10>] unmap_vmas+0x7b7/0x828 > [ 35.374850] [<ffffffff810c922b>] exit_mmap+0x82/0xfd > [ 35.376093] [<ffffffff81035ede>] mmput+0x43/0xcf > [ 35.377339] [<ffffffff8103a23a>] exit_mm+0x11d/0x12a > [ 35.378564] [<ffffffff8103c21e>] do_exit+0x2e1/0x932 > [ 35.379792] [<ffffffff810393cf>] ? kmsg_dump+0x136/0x150 > [ 35.381014] [<ffffffff815a78b5>] oops_end+0x89/0x8e > [ 35.382211] [<ffffffff8101fc79>] no_context+0x1f7/0x206 > [ 35.383384] [<ffffffff8101fe0f>] __bad_area_nosemaphore+0x187/0x1c7 > [ 35.384571] [<ffffffff810674bf>] ? __lock_acquire+0xc58/0xd09 > [ 35.385751] [<ffffffff8101fe5d>] bad_area_nosemaphore+0xe/0x10 > [ 35.386936] [<ffffffff815a9433>] do_page_fault+0x1f3/0x44b > [ 35.388111] [<ffffffff815a58f2>] ? trace_hardirqs_off_thunk+0x3a/0x3c > [ 35.389296] [<ffffffff815a6cbf>] page_fault+0x1f/0x30 > [ 35.390437] [<ffffffff813bf3d1>] ? input_set_keycode+0xad/0x12c > [ 35.391534] [<ffffffff813c231d>] evdev_do_ioctl+0x22b/0x79b > [ 35.392639] [<ffffffff815a4b04>] ? __mutex_lock_common+0x564/0x580 > [ 35.393722] [<ffffffff813c28ca>] ? evdev_ioctl_handler+0x3d/0x80 > [ 35.394747] [<ffffffff813c28ca>] ? evdev_ioctl_handler+0x3d/0x80 > [ 35.395748] [<ffffffff813c28f0>] evdev_ioctl_handler+0x63/0x80 > [ 35.396686] [<ffffffff813c292a>] evdev_ioctl+0xb/0xd > [ 35.397627] [<ffffffff810ea6cd>] vfs_ioctl+0x2d/0xa1 > [ 35.398541] [<ffffffff810eac4c>] do_vfs_ioctl+0x494/0x4cd > [ 35.399471] [<ffffffff810eacdc>] sys_ioctl+0x57/0x95 > [ 35.400387] [<ffffffff8100266b>] system_call_fastpath+0x16/0x1b > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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