linux-kernel - Re: 2.6.24 oops

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Message-Id: <20080212231826.2070fb95.akpm@linux-foundation.org>
Date:	Tue, 12 Feb 2008 23:18:26 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Lukas Hejtmanek <xhejtman@....muni.cz>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.24 oops

On Sun, 10 Feb 2008 22:55:28 +0100 Lukas Hejtmanek <xhejtman@....muni.cz> wrote:

> I encountered an oops while playing a movie with mplayer.
> (couple of hours before, I tried this exploit:
> http://www.securityfocus.com/data/vulnerabilities/exploits/27704.c
> so the oops may be induced by the exploit.)
> 
> [12695.120141] Unable to handle kernel paging request at 0000100000000000 RIP: 

A single bit set in a pointer which can legitimately be all-zeroes.

> [12695.120152]  [<ffffffff802705bb>] find_get_page+0x3b/0x80
> [12695.120166] PGD 0 
> [12695.120172] Oops: 0000 [1] PREEMPT SMP 
> [12695.120180] CPU 0 
> [12695.120184] Modules linked in: cdc_ether usbnet mii cdc_acm usb_storage des_generic cbc nfs lockd rpcsec_gss_krb5 auth_rpcgss sunrpc i915 drm rfcomm l2cap bluetooth fuse arc4 ecb blkcipher e1000 ehci_hcd uhci_hcd snd_hda_intel thinkpad_acpi intel_agp
> [12695.120228] Pid: 10382, comm: mplayer Not tainted 2.6.24 #2
> [12695.120232] RIP: 0010:[<ffffffff802705bb>]  [<ffffffff802705bb>] find_get_page+0x3b/0x80
> [12695.120242] RSP: 0018:ffff8100794d7ca8  EFLAGS: 00210006
> [12695.120247] RAX: 0000100000000000 RBX: 0000100000000000 RCX: 0000000000000000
> [12695.120252] RDX: ffff81000efe0000 RSI: 000000000001b3c0 RDI: 0000000000000000
> [12695.120257] RBP: ffff81007ceffeb8 R08: 0000000000000000 R09: ffffffff80270330
> [12695.120262] R10: 0000000000000000 R11: 0000000000000001 R12: 000000000001b3c0
> [12695.120267] R13: 0000000000000001 R14: ffff81000cf8a728 R15: ffff81000cf8a6c0
> [12695.120273] FS:  00002af6ae621610(0000) GS:ffffffff8062b000(0000) knlGS:0000000000000000
> [12695.120278] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [12695.120283] CR2: 0000100000000000 CR3: 00000000512b7000 CR4: 00000000000006e0
> [12695.120288] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [12695.120292] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [12695.120298] Process mplayer (pid: 10382, threadinfo ffff8100794d6000, task ffff81007c230000)
> [12695.120303] Stack:  ffff8100794d7ed8 ffff81007ceffea0 000000000001b3c0 ffffffff80270efb
> [12695.120313]  0000000000037000 ffffffff80270330 ffff8100794d7d68 ffff8100794d7e58
> [12695.120322]  ffff81000cf8a728 ffff81007ceffd78 000000000001b3c1 000000000001b3bf
> [12695.120329] Call Trace:
> [12695.120338]  [<ffffffff80270efb>] do_generic_mapping_read+0x10b/0x400
> [12695.120345]  [<ffffffff80270330>] file_read_actor+0x0/0x1a0
> [12695.120355]  [<ffffffff80272a8f>] generic_file_aio_read+0xff/0x1b0
> [12695.120366]  [<ffffffff80298a99>] do_sync_read+0xd9/0x120
> [12695.120373]  [<ffffffff802528ae>] enqueue_hrtimer+0x6e/0x110
> [12695.120383]  [<ffffffff8024fed0>] autoremove_wake_function+0x0/0x30
> [12695.120391]  [<ffffffff804c46f9>] do_nanosleep+0x69/0x90
> [12695.120397]  [<ffffffff802533c8>] hrtimer_nanosleep+0x78/0x140
> [12695.120404]  [<ffffffff80252bb0>] hrtimer_wakeup+0x0/0x30
> [12695.120411]  [<ffffffff804c46e5>] do_nanosleep+0x55/0x90
> [12695.120417]  [<ffffffff802993b5>] vfs_read+0xc5/0x160
> [12695.120422]  [<ffffffff8029984b>] sys_read+0x3b/0x90
> [12695.120429]  [<ffffffff80299863>] sys_read+0x53/0x90
> [12695.120437]  [<ffffffff8020c47e>] system_call+0x7e/0x83

On one of the most-used code paths in the entire kernel.

I'd say your hardware has malfunctioned.  Try running memtest86 for a day.
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