kernel 2.6 panic

kernel 2.6 panic

[manomugdha biswas]

Hi,
I have a kernel module. I can install (insmod) my
module successfully. I start my module by ioctl() from
user application and also use ioctl() to stop my
module from user application. But sometimes after
removing (stoping) my module kernel panic happens.
Following is the dump:

Sep 23 02:40:09 localhost kernel: Unable to handle
kernel NULL pointer dereference at virtual address
00000025
Sep 23 02:40:09 localhost kernel:  printing eip:
Sep 23 02:40:09 localhost kernel: c0163516
Sep 23 02:40:09 localhost kernel: *pde = 00000000
Sep 23 02:40:09 localhost kernel: Oops: 0000 [#1]
Sep 23 02:40:09 localhost kernel: Modules linked in:
vnicclient(U) i915 parport_pc lp parport autofs4
i2c_dev i2c_core sunrpc dm_mod button battery ac md5
ipv6 uhci_hcd ehci_hcd snd_intel8x0 snd_ac97_codec
snd_pcm_oss snd_mixer_oss snd_pcm snd_timer
snd_page_alloc snd_mpu401_uart snd_rawmidi
snd_seq_device snd soundcore e100 mii floppy ext3 jbd
Sep 23 02:40:09 localhost kernel: CPU:    0
Sep 23 02:40:09 localhost kernel: EIP:   
0060:[<c0163516>]    Not tainted VLI
Sep 23 02:40:09 localhost kernel: EFLAGS: 00010202  
(2.6.9-11.EL)
Sep 23 02:40:09 localhost kernel: EIP is at
sys_read+0x1d/0x62
Sep 23 02:40:09 localhost kernel: eax: 00000001   ebx:
00000001   ecx: f2067380   edx: 00000001 Sep 23
02:40:09 localhost kernel: esi: fffffff7   edi:
00000000   ebp: f29e5000   esp: f29e5fac
Sep 23 02:40:09 localhost kernel: ds: 007b   es: 007b 
 ss: 0068
Sep 23 02:40:09 localhost kernel: Process bash (pid:
10171, threadinfo=f29e5000 task=f21111a0)
Sep 23 02:40:09 localhost kernel: Stack: 00000000
00000000 00000000 00000000 bffdcbaf c03036f3 00000000
bffdcbaf
Sep 23 02:40:09 localhost kernel:        00000001
bffdcbaf 00000000 bffdcbb8 00000003 0000007b 0000007b
00000003
Sep 23 02:40:09 localhost kernel:        006e77a2
00000073 00000246 bffdcb94 0000007b
Sep 23 02:40:09 localhost kernel: Call Trace:
Sep 23 02:40:09 localhost kernel:  [<c03036f3>]
syscall_call+0x7/0xb
Sep 23 02:40:09 localhost kernel: Code: 00 e8 ed fc 01
00 89 d8 5d 5b 5e 5f 5d c3 56 be f7 ff ff ff 53 83 ec
0c 8b 44 24 18 8d 54 24 08 e8 8c 0d 00 00 85 c0 89 c3
74 3d <8b> 40 24 8b 53 28 89 04 24 89 e0 89 54 24 04
50 8b 54 24 20 89 Sep 23 02:40:09 localhost kernel: 
<0>Fatal exception: panic in 5 seconds

vnicclient is my module. 
Could you please tell me what is meant by  "Not
tainted VLI" ?

This is happening after comming out my module. 
Could you please give some light on this issue?

Thanks and Regards,
Mano




Manomugdha Biswas


		
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Re: kernel 2.6 panic

[Randy.Dunlap]

On Fri, 23 Sep 2005 13:15:38 +0100 (BST) manomugdha biswas wrote:

> Hi,
> I have a kernel module. I can install (insmod) my
> module successfully. I start my module by ioctl() from
> user application and also use ioctl() to stop my
> module from user application. But sometimes after
> removing (stoping) my module kernel panic happens.
> Following is the dump:
> 
> Sep 23 02:40:09 localhost kernel: Unable to handle
> kernel NULL pointer dereference at virtual address
> 00000025
> Sep 23 02:40:09 localhost kernel:  printing eip:
> Sep 23 02:40:09 localhost kernel: c0163516
> Sep 23 02:40:09 localhost kernel: *pde = 00000000
> Sep 23 02:40:09 localhost kernel: Oops: 0000 [#1]
> Sep 23 02:40:09 localhost kernel: Modules linked in:
> vnicclient(U) i915 parport_pc lp parport autofs4
> i2c_dev i2c_core sunrpc dm_mod button battery ac md5
> ipv6 uhci_hcd ehci_hcd snd_intel8x0 snd_ac97_codec
> snd_pcm_oss snd_mixer_oss snd_pcm snd_timer
> snd_page_alloc snd_mpu401_uart snd_rawmidi
> snd_seq_device snd soundcore e100 mii floppy ext3 jbd
> Sep 23 02:40:09 localhost kernel: CPU:    0
> Sep 23 02:40:09 localhost kernel: EIP:   
> 0060:[<c0163516>]    Not tainted VLI
> Sep 23 02:40:09 localhost kernel: EFLAGS: 00010202  
> (2.6.9-11.EL)
> Sep 23 02:40:09 localhost kernel: EIP is at
> sys_read+0x1d/0x62
> Sep 23 02:40:09 localhost kernel: eax: 00000001   ebx:
> 00000001   ecx: f2067380   edx: 00000001 Sep 23
> 02:40:09 localhost kernel: esi: fffffff7   edi:
> 00000000   ebp: f29e5000   esp: f29e5fac
> Sep 23 02:40:09 localhost kernel: ds: 007b   es: 007b 
>  ss: 0068
> Sep 23 02:40:09 localhost kernel: Process bash (pid:
> 10171, threadinfo=f29e5000 task=f21111a0)
> Sep 23 02:40:09 localhost kernel: Stack: 00000000
> 00000000 00000000 00000000 bffdcbaf c03036f3 00000000
> bffdcbaf
> Sep 23 02:40:09 localhost kernel:        00000001
> bffdcbaf 00000000 bffdcbb8 00000003 0000007b 0000007b
> 00000003
> Sep 23 02:40:09 localhost kernel:        006e77a2
> 00000073 00000246 bffdcb94 0000007b
> Sep 23 02:40:09 localhost kernel: Call Trace:
> Sep 23 02:40:09 localhost kernel:  [<c03036f3>]
> syscall_call+0x7/0xb
> Sep 23 02:40:09 localhost kernel: Code: 00 e8 ed fc 01
> 00 89 d8 5d 5b 5e 5f 5d c3 56 be f7 ff ff ff 53 83 ec
> 0c 8b 44 24 18 8d 54 24 08 e8 8c 0d 00 00 85 c0 89 c3
> 74 3d <8b> 40 24 8b 53 28 89 04 24 89 e0 89 54 24 04
> 50 8b 54 24 20 89 Sep 23 02:40:09 localhost kernel: 
> <0>Fatal exception: panic in 5 seconds
> 
> vnicclient is my module. 
> Could you please tell me what is meant by  "Not
> tainted VLI" ?

It's normal.  "Not tainted" means that there are no
proprietary modules loaded, only GPL modules.
VLI means Variable Length Instructions.  It's just a flag
to software that reads these reports that the "Code" bytes
are not fixed-length instructions.

> This is happening after comming out my module. 
> Could you please give some light on this issue?

Sure, just tell us where to find/get your GPL source code
and someone will probably take a look at it.

---
~Randy
You can't do anything without having to do something else first.
-- Belefant's Law