Re: [BProc] ps oops on 3.2.0

[<er...@he...>]

On Wed, Oct 16, 2002 at 04:06:26PM -0400, Nicholas Henke wrote:
> 
> I can cause a node to oops everytime with the attached script. I am
> running bproc-3.2.0 on 2.4.18, with the procfs locking patch. 
> Here is the oops fed through ksymoops after rebooting.

In general, I'd say I don't worry about co-existing nicely other
patches.  It's just too much trouble for me.  If you point me at the
other patch you're using I might be able to see what the problem is
pretty quickly though.  More likely, the locking is all moved around
in procfs and the BProc hooks need to be modified accordingly.  The
BProc hooks into procfs are pretty messy since things need to be done
atomically and there's a bunch of lock grabbing/releasing code already
in there.

- Erik

> Unable to handle kernel NULL pointer dereference at virtual address
> 00000010
> *pde = 00000000
> OOps: ----
> CPU: 0
> EIP: 0010:[<e095357f>] Not tainted
> Using defaults from ksymoops -t elf32-i386 -a i386
> EFLAGS: 00010202
> Process ps (pid: 788, stackpage=de02b000)
> Call Trace: [<c015c410>] [<c01343e1>] [<c015a593>] [<c013b1f6>]
> [<c010734b>]
> Code: 8b 40 10 c3 90 8b 82 94 00 00 00 8b 40 7c c3 89 f6 f6 50 20
> 
> >>EIP; e095357f <[bproc]send_recv_process+ff/145>   <=====
> Trace; c015c410 <proc_pid_status+110/3f0>
> Trace; c01343e1 <__alloc_pages+41/180>
> Trace; c015a593 <proc_info_read+63/120>
> Trace; c013b1f6 <sys_read+96/120>
> Trace; c010734b <system_call+33/38>
> Code;  e095357f <[bproc]send_recv_process+ff/145>
> 00000000 <_EIP>:
> Code;  e095357f <[bproc]send_recv_process+ff/145>   <=====
>    0:   8b 40 10                  mov    0x10(%eax),%eax   <=====
> Code;  e0953582 <[bproc]send_recv_process+102/145>
>    3:   c3                        ret
> Code;  e0953583 <[bproc]send_recv_process+103/145>
>    4:   90                        nop
> Code;  e0953584 <[bproc]send_recv_process+104/145>
>    5:   8b 82 94 00 00 00         mov    0x94(%edx),%eax
> Code;  e095358a <[bproc]send_recv_process+10a/145>
>    b:   8b 40 7c                  mov    0x7c(%eax),%eax
> Code;  e095358d <[bproc]send_recv_process+10d/145>
>    e:   c3                        ret
> Code;  e095358e <[bproc]send_recv_process+10e/145>
>    f:   89 f6                     mov    %esi,%esi
> Code;  e0953590 <[bproc]send_recv_process+110/145>
>   11:   f6 50 20                  notb   0x20(%eax)
> 
> 
> Nic
> -- 
> Nicholas Henke
> Linux Cluster Systems Programmer
> he...@se... - 215.573.8149