On Monday, 5 of November 2007, Grant Wilson wrote:
> Hi,
> I got this oops on 2.6.24-rc1-641-gb4f5550:
(1) Is this reproducible?
(2) Did it happen previously on your system?
> [18073.371126] Unable to handle kernel NULL pointer dereference at 0000000000000120 RIP:
> [18073.371134] [<ffffffff8023572e>] check_preempt_wakeup+0x6e/0x110
> [18073.371144] PGD 81f9067 PUD 81c8067 PMD 0
> [18073.371151] Oops: 0000 [1] PREEMPT SMP
> [18073.371157] CPU 2
> [18073.371161] Modules linked in: vfat fat
> [18073.371168] Pid: 4639, comm: kwin Not tainted 2.6.24-rc1 #1
> [18073.371171] RIP: 0010:[<ffffffff8023572e>] [<ffffffff8023572e>] check_preempt_wakeup+0x6e/0x110
> [18073.371177] RSP: 0018:ffff810008531a78 EFLAGS: 00010006
> [18073.371179] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
> [18073.371183] RDX: ffff810004441bf0 RSI: ffff81000801e860 RDI: ffff81000444ab80
> [18073.371186] RBP: ffff810008531aa8 R08: 000000d0d47a4a90 R09: 0000000000000000
> [18073.371188] R10: ffff810004441bf0 R11: 0000000000000001 R12: ffff810006520400
> [18073.371190] R13: ffff81000801e860 R14: ffff81000a63a000 R15: ffff81000443d8e0
> [18073.371193] FS: 00002b7d646a86f0(0000) GS:ffff810004c11780(0000) knlGS:0000000000000000
> [18073.371196] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [18073.371199] CR2: 0000000000000120 CR3: 0000000008495000 CR4: 00000000000006e0
> [18073.371202] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [18073.371211] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [18073.371214] Process kwin (pid: 4639, threadinfo ffff810008530000, task ffff81000840a860)
> [18073.371216] Stack: ffff81000444ab80 0000000000000001 ffff81000801e860 ffff81000444ab80
> [18073.371231] 0000000000000002 ffff81000443d8e0 ffff810008531b38 ffffffff8023061e
> [18073.371238] 0000000000000000 ffff810004441b80 0000000000000002 0000000100000000
> [18073.371245] Call Trace:
> [18073.371250] [<ffffffff8023061e>] try_to_wake_up+0x2fe/0x3a0
> [18073.371253] [<ffffffff802306cd>] default_wake_function+0xd/0x10
> [18073.371257] [<ffffffff8022daca>] __wake_up_common+0x5a/0x90
> [18073.371260] [<ffffffff8023095a>] __wake_up_sync+0x4a/0x70
> [18073.371264] [<ffffffff80602c3f>] unix_write_space+0x8f/0xa0
> [18073.371269] [<ffffffff80593359>] sock_wfree+0x49/0x50
> [18073.371272] [<ffffffff805951d9>] __kfree_skb+0x69/0xe0
> [18073.371275] [<ffffffff80595267>] kfree_skb+0x17/0x30
> [18073.371278] [<ffffffff80601347>] unix_stream_recvmsg+0x267/0x610
> [18073.371283] [<ffffffff8058e0b7>] sock_aio_read+0x107/0x110
> [18073.371287] [<ffffffff802929a1>] do_sync_read+0xf1/0x130
> [18073.371291] [<ffffffff8058e230>] sock_ioctl+0x0/0x260
> [18073.371295] [<ffffffff80251830>] autoremove_wake_function+0x0/0x40
> [18073.371299] [<ffffffff80600522>] unix_ioctl+0xb2/0xf0
> [18073.371302] [<ffffffff8058e301>] sock_ioctl+0xd1/0x260
> [18073.371305] [<ffffffff802a00c1>] do_ioctl+0x31/0x90
> [18073.371308] [<ffffffff802932f6>] vfs_read+0x156/0x160
> [18073.371311] [<ffffffff80293700>] sys_read+0x50/0x90
> [18073.371315] [<ffffffff8020bd7e>] system_call+0x7e/0x83
> [18073.371317]
> [18073.371319]
> [18073.371319] Code: 48 8b 90 20 01 00 00 48 39 93 20 01 00 00 75 e2 48 81 3b 00
> [18073.371346] RIP [<ffffffff8023572e>] check_preempt_wakeup+0x6e/0x110
> [18073.371351] RSP <ffff810008531a78>
> [18073.371354] CR2: 0000000000000120
> [18073.371358] note: kwin[4639] exited with preempt_count 3
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