Re: Null dereference bug on 2.6.36-rc8 (device-mapper?)

[Steven Rostedt]

On Wed, Oct 20, 2010 at 12:29:46PM +0300, Felipe Contreras wrote:
> Hi,
> 
> I just got this while running palimpset (didn't see that on -rc7)

Do you know what module it was loading?

> 
> Oct 20 12:25:06 annwn kernel: [43176.117555] BUG: unable to handle
> kernel NULL pointer dereference at 0000000c
> Oct 20 12:25:06 annwn kernel: [43176.117643] IP: [<c10a5396>]
> __trace_add_event_call+0x16/0x410

If the module has tracepoints, then they are read from the module
section into a table. Looks like the module had something bad there.

Do you have MODVERSIONS set in your kernel? If the module code was not
compiled against the same headers, then this could cause a bug.

-- Steve

> Oct 20 12:25:06 annwn kernel: [43176.117710] *pde = 00000000
> Oct 20 12:25:06 annwn kernel: [43176.117750] Oops: 0000 [#1] SMP
> Oct 20 12:25:06 annwn kernel: [43176.117801] last sysfs file:
> /sys/devices/virtual/block/dm-6/queue/rotational
> Oct 20 12:25:06 annwn kernel: [43176.117860] Modules linked in:
> dm_crypt(+) fuse cdc_ether usbnet mii sunrpc ext4 mbcache jbd2 crc16
> kvm_intel kvm thinkpad_acpi iwl3945 e1000e iwlcore [last unloaded:
> scsi_wait_scan]
> Oct 20 12:25:06 annwn kernel: [43176.118007]
> Oct 20 12:25:06 annwn kernel: [43176.118007] Pid: 13364, comm:
> modprobe Not tainted 2.6.36-rc7 #7 2008Y32/2008Y32
> Oct 20 12:25:06 annwn kernel: [43176.118007] EIP: 0060:[<c10a5396>]
> EFLAGS: 00010282 CPU: 1
> Oct 20 12:25:06 annwn kernel: [43176.118007] EIP is at
> __trace_add_event_call+0x16/0x410
> Oct 20 12:25:06 annwn kernel: [43176.118007] EAX: 00000000 EBX:
> 00000000 ECX: f5b1460c EDX: f85eb2a0
> Oct 20 12:25:06 annwn kernel: [43176.118007] ESI: 00000048 EDI:
> f85eb2a0 EBP: cbb47e84 ESP: cbb47e54
> Oct 20 12:25:06 annwn kernel: [43176.118007]  DS: 007b ES: 007b FS:
> 00d8 GS: 0033 SS: 0068
> Oct 20 12:25:06 annwn kernel: [43176.118007] Process modprobe (pid:
> 13364, ti=cbb46000 task=f50ea580 task.ti=cbb46000)
> Oct 20 12:25:06 annwn kernel: [43176.118007] Stack:
> Oct 20 12:25:06 annwn kernel: [43176.118007]  00000000 00000246
> 000000d0 cbb47e84 00000246 c63939c0 cbb47eb0 c10a57f8
> Oct 20 12:25:06 annwn kernel: [43176.118007] <0> f5b1460c f85eb2a0
> 00000048 f5b14670 cbb47eb8 c10a5930 f5b14670 f5b14738
> Oct 20 12:25:06 annwn kernel: [43176.118007] <0> f5b146d4 f5b1460c
> f5b146d4 f5b14738 daa04080 f5b14600 c1783088 00000000
> Oct 20 12:25:06 annwn kernel: [43176.118007] Call Trace:
> Oct 20 12:25:06 annwn kernel: [43176.118007]  [<c10a57f8>] ?
> trace_module_notify+0x68/0x2b0
> Oct 20 12:25:06 annwn kernel: [43176.118007]  [<c10a5930>] ?
> trace_module_notify+0x1a0/0x2b0
> Oct 20 12:25:06 annwn kernel: [43176.118007]  [<c1578e30>] ?
> notifier_call_chain+0x40/0x60
> Oct 20 12:25:06 annwn kernel: [43176.118007]  [<c1061056>] ?
> __blocking_notifier_call_chain+0x46/0x60
> Oct 20 12:25:06 annwn kernel: [43176.118007]  [<c106108a>] ?
> blocking_notifier_call_chain+0x1a/0x20
> Oct 20 12:25:06 annwn kernel: [43176.118007]  [<c107421a>] ?
> sys_init_module+0xda/0x1040
> Oct 20 12:25:06 annwn kernel: [43176.118007]  [<c1002e0c>] ?
> sysenter_do_call+0x12/0x22
> Oct 20 12:25:06 annwn kernel: [43176.118007]  [<c1050000>] ?
> signal_wake_up+0x30/0x40
> Oct 20 12:25:06 annwn kernel: [43176.118007] Code: c9 83 f8 01 19 c0
> 83 e0 ed c3 8d 74 26 00 8d bc 27 00 00 00 00 55 89 e5 83 ec 30 89 5d
> f4 89 75 f8 89 7d fc 89 c3 89 4d f0 89 d7 <8b> 40 0c be ea ff ff ff 85
> c0 74 1d 8b 43 08 8b 50 20 85 d2 74
> Oct 20 12:25:06 annwn kernel: [43176.118007] EIP: [<c10a5396>]
> __trace_add_event_call+0x16/0x410 SS:ESP 0068:cbb47e54
> Oct 20 12:25:06 annwn kernel: [43176.118007] CR2: 000000000000000c
> Oct 20 12:25:06 annwn kernel: [43176.134274] ---[ end trace
> 39b1707504206e4d ]---
> Oct 20 12:25:06 annwn kernel: [43176.134436] device-mapper: table:
> 254:6: crypt: unknown target type
> Oct 20 12:25:06 annwn kernel: [43176.134489] device-mapper: ioctl:
> error adding target to table
> 
> -- 
> Felipe Contreras
> --
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