linux-kernel - Re: 2.6.24.7-rt13 Oops

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Message-ID: <484CE70A.60703@cfl.rr.com>
Date:	Mon, 09 Jun 2008 04:17:14 -0400
From:	Mark Hounschell <dmarkh@....rr.com>
To:	"Luis Claudio R. Goncalves" <lclaudio@...g.org>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.24.7-rt13 Oops

Luis Claudio R. Goncalves wrote:
> On Sun, Jun 08, 2008 at 05:14:11AM -0400, Mark Hounschell wrote:
>> BUG: unable to handle kernel paging request at virtual address 00656c0c
> 
> It seems like you have just found a buffer overflow in vsnprintf... as the
> requested address was "el\n" :)
> 
> I wonder where do this data came from. Could you please send us the log
> lines around this oops? I have the impression something was printed right
> before the oops.
> 
> Luis
> 

There is nothing else around the Oops in the log. However a non-RT 
kernel will print this.

Jun  9 04:15:26 harley kernel: CDB:
Jun  9 04:15:26 harley kernel: aic7xxx_dev_reset returns 0x2002

>> printing eip: c01cb82e *pde = 00000000
>> Oops: 0000 [#1] PREEMPT SMP
>> Modules linked in: lp af_packet appletalk ax25 ipx p8023 udf ip6t_LOG 
>> nf_conntrack_ipv6 xt_pkttype ipt_LOG xt_limit snd_pcm_oss snd_mixer_oss 
>> snd_seq snd_seq_device ip6t_REJECT xt_tcpudp ipt_REJECT xt_state 
>> iptable_mangle iptable_nat nf_nat iptable_filter ip6table_mangle 
>> nf_conntrack_ipv4 nf_conntrack ip_tables ip6table_filter ip6_tables 
>> x_tables ipv6 fuse loop dm_mod snd_hda_intel snd_pcm snd_timer rtc_cmos snd 
>> rtc_core osst ati_agp i2c_piix4 e1000 ide_cd soundcore parport_pc agpgart 
>> rtc_lib cdrom sky2 k8temp snd_page_alloc st hwmon i2c_core parport ide_disk 
>> sg ehci_hcd ohci_hcd usbcore ssb sd_mod edd ext3 mbcache jbd aic7xxx 
>> scsi_transport_spi pata_jmicron atiixp ide_core ahci libata scsi_mod
>>
>> Pid: 9661, comm: v27 Not tainted (2.6.24.7-rt13 #3)
>> EIP: 0060:[<c01cb82e>] EFLAGS: 00210097 CPU: 1
>> EIP is at strnlen+0x6/0x18
>> EAX: 00656c0c EBX: 00656c0c ECX: 00656c0c EDX: fffffffe
>> ESI: c03c605c EDI: ebb2fdb0 EBP: ffffffff ESP: ebb2fccc
>>  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 preempt:00000002
>> Process v27 (pid: 9661, ti=ebb2e000 task=f3ca1810 task.ti=ebb2e000)
>> Stack: c01caf08 00200246 c0177fb3 f3c22b40 ebb2fd54 c4835a70 c4835a6c 
>> 00000400
>>        c03c604c c01c6572 c03c644c 00000000 ffffffff f4f573b6 00000400 
>> 00656c0c
>>        f325a9e0 c03c604c c01cb170 ebb2fda8 f4f5739c c011b8fd ebb2fda8 
>> 00000b61
>> Call Trace:
>>  [<c01caf08>] vsnprintf+0x29d/0x46a
>>  [<c0177fb3>] dput+0x2c/0xff
>>  [<c01c6572>] __next_cpu+0x12/0x21
>>  [<c01cb170>] vscnprintf+0x14/0x20
>>  [<c011b8fd>] vprintk+0xdc/0x2c8
>>  [<c010309a>] __switch_to+0x15/0x11f
>>  [<c02b5505>] __spin_unlock+0xc/0x20
>>  [<c011698b>] finish_task_switch+0x26/0x83
>>  [<c011bb04>] printk+0x1b/0x1f
>>  [<f4f4cf18>] ahc_linux_queue_recovery_cmd+0x6f/0x982 [aic7xxx]
>>  [<c012e02e>] lock_hrtimer_base+0x15/0x2f
>>  [<c01659a8>] kmem_cache_alloc+0x7d/0xb1
>>  [<f4f4d839>] ahc_linux_dev_reset+0xe/0x2a [aic7xxx]
>>  [<f482c801>] scsi_try_bus_device_reset+0x1d/0x3c [scsi_mod]
>>  [<f482e152>] scsi_reset_provider+0x98/0x12a [scsi_mod]
>>  [<c0159a52>] find_extend_vma+0x12/0x49
>>  [<c0133aa8>] get_futex_key+0x6e/0x122
>>  [<c0133e37>] futex_wait+0x1fc/0x2dc
>>  [<c0134226>] futex_wahke+0xb8/0xc2
>>  [<c0134dd0>] do_futex+0x7a/0x9eb
>>  [<c012d99f>] hrtimer_forward+0xba/0xd0
>>  [<f4e6c660>] sg_ioctl+0x8d3/0x9dd [sg]
>>  [<c02b5505>] __spin_unlock+0xc/0x20
>>  [<c01301d6>] getnstimeofday+0x2b/0xb2
>>  [<c02b422f>] rt_mutex_lock+0x15/0x3f
>>  [<c0137d4c>] rt_down+0xe/0x26
>>  [<c017307c>] do_ioctl+0x4c/0x62
>>  [<c01732c9>] vfs_ioctl+0x237/0x249
>>  [<c0173320>] sys_ioctl+0x45/0x5d
>>  [<c010402a>] sysenter_past_esp+0x5f/0x85
>>  =======================
>> ---------------------------
>> | preempt count: 00000002 ]
>> | 2-level deep critical section nesting:
>> ----------------------------------------
>> .. [<c011b832>] .... vprintk+0x11/0x2c8
>> .....[<00000000>] ..   ( <= _stext+0x3feff000/0x14)
>> .. [<c02b515e>] .... __spin_lock+0xd/0x23
>> .....[<00000000>] ..   ( <= _stext+0x3feff000/0x14)
>>
>> Code: c9 74 0c f2 ae 74 05 bf 01 00 00 00 4f 89 fa 5f 89 d0 c3 85 c9 57 89 
>> c7 89 d0 74 05 f2 ae 75 01 4f 89 f8 5f c3 89 c1 89 c8 eb 06 <80> 38 00 74 
>> 07 40 4a 83 fa ff 75 f4 29 c8 c3 90 90 90 57 83 c9
>> EIP: [<c01cb82e>] strnlen+0x6/0x18 SS:ESP 0068:ebb2fccc
>> ---[ end trace a30b09d6b0410b5f ]---
>> note: v27[9661] exited with preempt_count 1
>>
>>
>> What causes it:
>>
>>     rst_command = SG_SCSI_RESET_DEVICE;
>>     if (ioctl(Q->DevSpec1, SG_SCSI_RESET, &rst_command) < 0)
>>             perror("gen_rst: Scsi Device Reset");
>>
>>
>> Regards
>> Mark
>>
>>
>>
>> --
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> ---end quoted text---
> 


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