linux-kernel - Re: How to produce a core

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Date:	Thu, 24 May 2007 12:23:17 +0800
From:	gshan <gshan@...atel-lucent.com>
To:	Willy Tarreau <w@....eu>
CC:	linux-kernel@...r.kernel.org
Subject: Re: How to produce a core

Willy Tarreau wrote:
> On Thu, May 24, 2007 at 11:28:15AM +0800, gshan wrote:
>   
>> This morning, I tried command "kill -7 [pid]" but didn't see the core 
>> file. Anybody has ideas?
>>     
>
> do the following before starting your program :
>
> # ulimit -c unlimited
>
> You can check before and after that the core size changed from 0 to
> "unlimited" :
>
> # ulimit -a
>
> Willy
>
>   
Willy,

Thank you very much. The command "kill -7 [pid]" really works with 
"ulimit -c unlimited"

# /bin/sh                                   
# ps
PID   USER     COMMAND
    1 0        init 
    2 0        [ksoftirqd/0]
    3 0        [desched/0]
    4 0        [events/0]
    5 0        [khelper]
   10 0        [kthread]
   31 0        [kblockd/0]
   60 0        [pdflush]
   61 0        [pdflush]
   63 0        [aio/0]
   62 0        [kswapd0]
   64 0        [jfsIO]
   65 0        [jfsCommit]
   66 0        [jfsSync]
   67 0        [xfslogd/0]
   68 0        [xfsdatad/0]
   69 0        [xfsbufd]
  706 0        [mtdblockd]
  730 0        -sh
  788 0        /bin/sh
  789 0        ps
# ulimit -c unlimited
# kill -7 788
Bus error (core dumped)
# ls -al
drwxr-xr-x   12 0        0               0 Jan  1 00:55 .
drwxr-xr-x   12 0        0               0 Jan  1 00:55 ..
drwxr-xr-x    2 1000     1000            0 Jan  1 00:00 bin
-rw-------    1 0        0          417792 Jan  1 00:55 
core                                       <<< Here is the corefile
drwxr-xr-x    2 0        0               0 Jan  1 00:00 dev
drwxr-xr-x    3 0        0               0 Jan  1 00:00 etc
lrwxrwxrwx    1 0        0              12 Jan  1 00:00 init -> /bin/busybox
drwxr-xr-x    2 0        0               0 Jan  1 00:00 lib
drwxr-xr-x    2 0        0               0 Jan  1 00:00 misc
dr-xr-xr-x   32 0        0               0 Jan  1 00:00 proc
drwx------    2 0        0               0 Jan  1 00:00 root
drwxr-xr-x    2 0        0               0 Jan  1 00:00 sbin
drwxr-xr-x    2 0        0               0 Jan  1 00:00 sys
drwxr-xr-x    4 0        0               0 Jan  1 00:00 usr
#

Thanks,
Gavin
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