Messages in this thread | | | Date | Mon, 12 Oct 2009 11:19:54 +0200 | From | Ingo Molnar <> | Subject | Re: [crash] NULL pointer dereference at IP: [<ffffffff812e9ccb>] uart_close+0x2a/0x1e4 |
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* Ingo Molnar <mingo@elte.hu> wrote:
> here's a new crash i havent seen before: > > modprobe used greatest stack depth: 3416 bytes left > BUG: unable to handle kernel NULL pointer dereference at 0000000000000240 > IP: [<ffffffff812e9ccb>] uart_close+0x2a/0x1e4 > PGD 774b8067 PUD 774b6067 PMD 0 > Oops: 0000 [#1] DEBUG_PAGEALLOC > last sysfs file: > CPU 0 > Modules linked in: > Pid: 1107, comm: hwclock Not tainted 2.6.32-rc3-tip #8181 System Product Name > RIP: 0010:[<ffffffff812e9ccb>] [<ffffffff812e9ccb>] uart_close+0x2a/0x1e4 > RSP: 0018:ffff88007754fb88 EFLAGS: 00010246 > RAX: ffffffff812e9ca1 RBX: ffff8800774bcc80 RCX: 0000000000000000 > RDX: ffff88007b320900 RSI: ffff8800774bcc80 RDI: ffff88007b3bb000 > RBP: ffff88007754fbb8 R08: ffff88007754fab8 R09: ffffffff8103f397 > R10: 0000000000000246 R11: ffffffff812c1981 R12: 0000000000000000 > R13: 0000000000000000 R14: ffff88007b3bb000 R15: 0000000000000000 > FS: 00007f7a51c4c6f0(0000) GS:ffffffff81b38000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > CR2: 0000000000000240 CR3: 00000000774c2000 CR4: 00000000000026f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Process hwclock (pid: 1107, threadinfo ffff88007754e000, task ffff88007a4e8000) > Stack: > ffff88007754fbb8 ffff88007b3bb000 0000000000000000 00000000fffffffa > <0> 0000000000000000 0000000000000000 ffff88007754fc98 ffffffff812c3976 > <0> ffff88007754fbf8 0000000000000246 ffff88007b338150 ffff88007b338000 > Call Trace: > [<ffffffff812c3976>] tty_release_dev+0x1ca/0x4d8 > [<ffffffff817718fe>] ? mutex_unlock+0xe/0x10 > [<ffffffff81773725>] ? _spin_unlock+0x2b/0x2f > [<ffffffff812c4235>] tty_open+0x33f/0x41d > [<ffffffff81117245>] chrdev_open+0x179/0x19a > [<ffffffff8111285a>] __dentry_open+0x1cf/0x2f9 > [<ffffffff811170cc>] ? chrdev_open+0x0/0x19a > [<ffffffff811137e4>] nameidata_to_filp+0x45/0x56 > [<ffffffff811200fa>] do_filp_open+0x58a/0xa39 > [<ffffffff81094f37>] ? __lock_acquire+0x8f5/0x95a > [<ffffffff8103f3d6>] ? native_sched_clock+0x3b/0x52 > [<ffffffff811294b8>] ? alloc_fd+0x110/0x11f > [<ffffffff81773725>] ? _spin_unlock+0x2b/0x2f > [<ffffffff811294b8>] ? alloc_fd+0x110/0x11f > [<ffffffff81112598>] do_sys_open+0x62/0x109 > [<ffffffff81112672>] sys_open+0x20/0x22 > [<ffffffff81038dff>] system_call_fastpath+0x16/0x1b > Code: c3 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 08 0f 1f 44 00 00 f6 05 9d 2e 55 01 08 4c 8b af 28 04 00 00 49 89 fe 48 89 f3 <4d> 8b bd 40 02 00 00 74 16 f6 05 87 2e 55 01 40 74 0d 80 3d 33 > RIP [<ffffffff812e9ccb>] uart_close+0x2a/0x1e4 > RSP <ffff88007754fb88> > CR2: 0000000000000240 > ---[ end trace 16e4ef47b9d6effc ]--- > sky2 eth0: enabling interface > > Note, i have your fix below applied in tip:out-of-tree - it might be the > source of this bug? (If yes then this isnt an .32-rc4 problem.) > > ----------------------> > From 3fafdd6fb57253362575d61e8e2a5c915ccb62fb Mon Sep 17 00:00:00 2001 > From: Linus Torvalds <torvalds@linux-foundation.org> > Date: Thu, 1 Oct 2009 17:05:18 -0700 > Subject: [PATCH] tty: Fix "WARNING: at drivers/char/tty_io.c:1267"
i've reverted this and the crash is still there:
Call Trace: [<ffffffff812c3ece>] tty_release_dev+0x1ca/0x4d8 [<ffffffff81772e5e>] ? mutex_unlock+0xe/0x10 [<ffffffff81774cd5>] ? _spin_unlock+0x2b/0x2f [<ffffffff812c478d>] tty_open+0x33f/0x41d [<ffffffff811174a1>] chrdev_open+0x179/0x19a [<ffffffff81112a8a>] __dentry_open+0x1cf/0x2f9 [<ffffffff81117328>] ? chrdev_open+0x0/0x19a [<ffffffff81113a14>] nameidata_to_filp+0x45/0x56 [<ffffffff8112035a>] do_filp_open+0x58a/0xa39 [<ffffffff8103f3ce>] ? native_sched_clock+0x3b/0x52 [<ffffffff8103f38f>] ? sched_clock+0x17/0x1b [<ffffffff8108c06e>] ? cpu_clock+0x41/0x5b [<ffffffff8112971c>] ? alloc_fd+0x110/0x11f [<ffffffff81774cd5>] ? _spin_unlock+0x2b/0x2f [<ffffffff8112971c>] ? alloc_fd+0x110/0x11f [<ffffffff811127c8>] do_sys_open+0x62/0x109 [<ffffffff811128a2>] sys_open+0x20/0x22 [<ffffffff81038dff>] system_call_fastpath+0x16/0x1b Code: c3 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 08 0f 1f 44 00 00 f6 05 31 29 55 01 08 4c 8b af 28 04 00 00 49 89 fe 48 89 f3 <4d> 8b bd 40 02 00 00 74 16 f6 05 1b 29 55 01 40 74 0d 80 3d e7 RIP [<ffffffff812ea237>] uart_close+0x2a/0x1e4 RSP <ffff88007709bb88> CR2: 0000000000000240 ---[ end trace 7a94f79b2992f19c ]---
Ingo
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