Re: radosgw crash within libfcgi

[Yehuda Sadeh-Weinraub <yehuda@redhat.com>]

----- Original Message -----
> From: "GuangYang" <yguang11@outlook.com>
> To: ceph-devel@vger.kernel.org, ceph-users@lists.ceph.com, yehuda@redhat.com
> Sent: Wednesday, June 24, 2015 10:09:58 AM
> Subject: radosgw crash within libfcgi
> 
> Hello Cephers,
> Recently we have several radosgw daemon crashes with the same following
> kernel log:
> 
> Jun 23 14:17:38 xxx kernel: radosgw[68180]: segfault at f0 ip
> 00007ffa069996f2 sp 00007ff55c432710 error 6 in
> libfcgi.so.0.0.0[7ffa06995000+a000] in libfcgi.so.0.0.0[7ffa06995000+a000]
> 
> Looking at the assembly, it seems crashing at this point -
> http://github.com/sknown/fcgi/blob/master/libfcgi/fcgiapp.c#L2035, which
> confused me. I tried to see if there is any other reference holding the
> FCGX_Request which release the handle without any luck.
> 
> There are also other observations:
>  1> Several radosgw daemon across different hosts crashed around the same
>  time.
>  2> Apache's error log has some fcgi error complaining ##idle timeout##
>  during the time.
> 
> Does anyone experience similar issue?
> 

In the past we've had issues with libfcgi that were related to the number of open fds on the process (> 1024). The issue was a buggy libfcgi that was using select() instead of poll(), so this might be the issue you're noticing.

Yehuda
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