[prev in list] [next in list] [prev in thread] [next in thread]
List: linux-coda
Subject: Re: venus crashes again today, different cause
From: Jan Harkes <jaharkes () cs ! cmu ! edu>
Date: 2003-05-08 14:01:52
[Download RAW message or body]
On Wed, May 07, 2003 at 11:25:30PM -0700, Steve Simitzis wrote:
> i came home from dinner tonight, and found several pages of this in
> the logs:
>
> 0x360f0a08 : fid = ((0x7f000001.0x1fffe.0x17dc2)), comp = sepia03.jpg, vol = 35180988
...
> followed by a bunch of stats:
>
> VFS Operations
> Operation Counts Times
> Root : 0 [ 0 0 0] : 0.0 ( 0.0)
> OpenByFD : 0 [ 0 0 0] : 0.0 ( 0.0)
> Open : 13357503 [ 162 30 1] : 1.1 ( 79.9)
> Close : 13356008 [ 0 0 73] : 0.2 ( 36.6)
> [...]
>
> then it dies.
Actually it died before all of this got dumped. This is output from the
'VenusPrint' function which is called when there is something terribly
wrong.
> [ F(05) : 0000 : 23:17:59 ] ***** FATAL SIGNAL (11) *****
>
> it died right away:
>
> 23:17:59 Fatal Signal (11); pid 11743 becoming a zombie...
> 23:17:59 You may use gdb to attach to 11743
>
>
> i attached gdb to the zombie, and here's what i found:
>
> 0x420292e5 in sigsuspend () from /lib/i686/libc.so.6
> (gdb) where
> #3 0x4002b30b in coalesce (tid=0x8103810, err=0x15093ec0) at rds_coalesce.c:71
> #4 0x4002bbbe in rds_do_free (list=0x811b754, mode=no_flush) at rds_free.c:204
> #5 0x080c7365 in strcpy ()
> #6 0x08085fd6 in strcpy ()
All these strcpy's are probably a result of not having symbols in the
venus binary (i.e. it was stripped).
But we crashed while trying to defragment RVM when a new chunk was
freed. This could be something like a double free, perhaps we crashed
earlier after freeing some RVM memory, but haven't yet destroyed the
object that was referencing it. If I remember correctly, RVM free
operations use their own transaction so we can't commit the free and
remove of the referencing pointer in a single operation.
It is possible to get either this case (double free) or some memory
leakage wheneven venus crashes. Although I rather have the memory leak
(venus still starts) than the double free (venus needs reinit).
Jan
[prev in list] [next in list] [prev in thread] [next in thread]
Configure |
About |
News |
Add a list |
Sponsored by KoreLogic