oops in 2.4.6/2.4.5

oops in 2.4.6/2.4.5

[Victoria W.]

Hello all,

a fax-machine with cyclades-8-card (isa) 256MB, 1GB ext2, 1GB swap, 40GB
reiserfs hangs after a period of time (8-48h) with an oops.
It seems to hang on a "sync" but the messages are not the same every time.
(there was a dead "sync" process in "ps x")

the same behaviour occurs in 2.4.5 and 2.4.6.

I've tried to reproduce the crash by pushing the load up to >100 - but
nothing happens. But within 48h the machine hung again.

Do you have any hints or ideas what to do now ?

best regards
wicki



here is one oops-example:
Unable to handle kernel NULL pointer dereference at virtual address
00000000
 printing eip:
c0005bed
*pde = 00000000
Oops: 0002
CPU:    0
EIP:    0010:[<c0005bed>]
EFLAGS: 00010246
eax: 00000000   ebx: cf3f2690   ecx: c9d80260   edx: c9d80260
esi: cab5dfb8   edi: cab5c000   ebp: 00000000   esp: cab5dfa8
ds: 0018   es: 0018   ss: 0018
Process loop5 (pid: 270, stackpage=cab5d000)
Stack: cab5c000 cecd5f28 cf3f258c c77c1500 00000001 cab5c000 cf3f269c
cf3f269c 
       c0105ca3 cf3f2690 c77c1500 d08288f6 00000f00 cecd5f28 cf3f258c
ffff0303 
       00000078 c010563b c0105644 cf3f258c 00000078 cf229860 
Call Trace: [<c0105ca3>] [<c010563b>] [<c0105644>] 

Code: 00 00 00 7c 67 13 08 32 00 00 00 21 cc 01 cc 61 cb 41 cb 61 

and here an other one from the same machine:

kernel: kernel BUG at page_alloc.c:75!
kernel: invalid operand: 0000
kernel: CPU:    0

send_sig_info help?

[samandbuffy]

Guys,

This is my first attempt at writing at the kernel
level. I'm working on a device driver, and usually in
userspace, I use Kill() to send a signal to a PID I
know of.

At the kernel level, I don't know of any kill()
equivalents (are there any?), except send_sig_info().

Send_sig_info(int, struct siginfo *, struct
tasktstruct *)

I know the int is the PID from "Understanding the
Linux Kernel -Oreilly". 

The problem I'm experiencing is that I'm not sure how
to find the pointer to taskstruct.  From what I"ve
read, the pointer to taskstruct is a pointer to the
target process.  How do I find the pointer to the
taskstruct of that task I want to send a signal to, if
I only know its PID?

Thanks, any help would be greatly appreciated.

Sam


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Re: send_sig_info help?

[Keith Owens]

On Mon, 16 Jul 2001 09:45:46 -0700 (PDT), 
<samandbuffy@yahoo.com> wrote:
>The problem I'm experiencing is that I'm not sure how
>to find the pointer to taskstruct.  From what I"ve
>read, the pointer to taskstruct is a pointer to the
>target process.  How do I find the pointer to the
>taskstruct of that task I want to send a signal to, if
>I only know its PID?

See drivers/char/sysrq.c::send_sig_all().