Re: radosgw crash within libfcgi

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

----- Original Message -----
> From: "GuangYang" <yguang11@outlook.com>
> To: "Yehuda Sadeh-Weinraub" <yehuda@redhat.com>
> Cc: ceph-devel@vger.kernel.org, ceph-users@lists.ceph.com
> Sent: Wednesday, June 24, 2015 1:53:20 PM
> Subject: RE: radosgw crash within libfcgi
> 
> Thanks Yehuda for the response.
> 
> We already patched libfcgi to use poll instead of select to overcome the
> limitation.
> 
> Thanks,
> Guang
> 
> 
> ----------------------------------------
> > Date: Wed, 24 Jun 2015 14:40:25 -0400
> > From: yehuda@redhat.com
> > To: yguang11@outlook.com
> > CC: ceph-devel@vger.kernel.org; ceph-users@lists.ceph.com
> > Subject: Re: radosgw crash within libfcgi
> >
> >
> >
> > ----- 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

error 6 is sigabrt, right? With invalid pointer I'd expect to get segfault. Is the pointer actually invalid?

Yehuda


> >> 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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