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Re: [Gluster-devel] Another segfault on client side (only sporadic)


From: Krishna Srinivas
Subject: Re: [Gluster-devel] Another segfault on client side (only sporadic)
Date: Fri, 24 Aug 2007 15:37:41 +0530

Bernhard,

Can you do "p *loc" and "p *loc->inode"

Thanks
Krishna

On 8/24/07, Bernhard J. M. Grün <address@hidden> wrote:
> Hi Krishna,
>
> Unfortunately I can't give you access to our production systems. At
> least not at the moment.
> What I can do is to give you the compiled version of glusterfs, the
> system (Ubuntu 7.04 x86-64) and the core dumps.
>
> But I have two new back traces for you. They are from the second
> glusterfs client but the binaries of boths clients are the same:
> First back trace:
> Core was generated by `[glusterfs]
>                               '.
> Program terminated with signal 11, Segmentation fault.
> #0  0x00002aaaaacbc2bd in afr_stat (frame=0x2aaab0831c80, this=<value
> optimized out>, loc=0x2aaaed03abf8) at afr.c:2602
> 2602    afr.c: No such file or directory.
>         in afr.c
> (gdb) bt
> #0  0x00002aaaaacbc2bd in afr_stat (frame=0x2aaab0831c80, this=<value
> optimized out>, loc=0x2aaaed03abf8) at afr.c:2602
> #1  0x00002aaaaaece1bb in iot_stat (frame=0x2aaab10bfd50,
> this=0x6126d0, loc=0x2aaaed03abf8) at io-threads.c:651
> #2  0x00002ab5c53e1382 in default_stat (frame=0x2aaae2a881a0,
> this=0x612fe0, loc=0x2aaaed03abf8) at defaults.c:112
> #3  0x00002aaaab2db252 in wb_stat (frame=0x2aaac90c5420,
> this=0x613930, loc=0x2aaaed03abf8) at write-behind.c:236
> #4  0x0000000000405fd2 in fuse_getattr (req=<value optimized out>,
> ino=<value optimized out>, fi=<value optimized out>) at
> fuse-bridge.c:496
> #5  0x0000000000407139 in fuse_transport_notify (xl=<value optimized
> out>, event=<value optimized out>, data=<value optimized out>) at
> fuse-bridge.c:2067
> #6  0x00002ab5c53e3632 in sys_epoll_iteration (ctx=<value optimized
> out>) at epoll.c:53
> #7  0x000000000040356b in main (argc=5, argv=0x7fffe58f3348) at 
> glusterfs.c:387
>
> Second back trace:
> Program terminated with signal 11, Segmentation fault.
> #0  0x00002aaaaacbc2bd in afr_stat (frame=0x2aab10d94830, this=<value
> optimized out>, loc=0x2aab1105bd68) at afr.c:2602
> 2602    afr.c: No such file or directory.
>         in afr.c
> (gdb) bt
> #0  0x00002aaaaacbc2bd in afr_stat (frame=0x2aab10d94830, this=<value
> optimized out>, loc=0x2aab1105bd68) at afr.c:2602
> #1  0x00002aaaaaece1bb in iot_stat (frame=0x2aab11aee060,
> this=0x6126d0, loc=0x2aab1105bd68) at io-threads.c:651
> #2  0x00002b56305f4382 in default_stat (frame=0x2aab15cb30a0,
> this=0x612fe0, loc=0x2aab1105bd68) at defaults.c:112
> #3  0x00002aaaab2db252 in wb_stat (frame=0x2aab1807e2e0,
> this=0x613930, loc=0x2aab1105bd68) at write-behind.c:236
> #4  0x0000000000405fd2 in fuse_getattr (req=<value optimized out>,
> ino=<value optimized out>, fi=<value optimized out>) at
> fuse-bridge.c:496
> #5  0x0000000000407139 in fuse_transport_notify (xl=<value optimized
> out>, event=<value optimized out>, data=<value optimized out>) at
> fuse-bridge.c:2067
> #6  0x00002b56305f6632 in sys_epoll_iteration (ctx=<value optimized
> out>) at epoll.c:53
> #7  0x000000000040356b in main (argc=5, argv=0x7fff7a6de138) at 
> glusterfs.c:387
>
> It seems the error is the same in all three cases.
>
> Bernhard
>
> 2007/8/22, Krishna Srinivas <address@hidden>:
> > Hi Bernhard,
> >
> > We are not able to figure out the bug's cause. Is it possible for
> > you to give us access to your machine for debugging the core?
> >
> > Thanks
> > Krishna
> >
> > On 8/20/07, Bernhard J. M. Grün <address@hidden> wrote:
> > > I still have the core dump of the crash I've reported. But I don't
> > > know if the backtrace is the same every time. The glusterfs client now
> > > runs perfectly since 2007-08-16. So we have to wait for the next crash
> > > to analyse that issue further.
> > > Also the "print child_errno" does not output anything useful. It just
> > > says that there is no symbol with that name in the current context.
> > >
> > > 2007/8/20, Krishna Srinivas <address@hidden>:
> > > > Do you see the same backtrace everytime it crashes?
> > > > can you do "print child_errno" at the gdb prompt when you have the core?
> > > >
> > > > Thanks
> > > > Krishna
> > > >
> > > > On 8/20/07, Bernhard J. M. Grün <address@hidden> wrote:
> > > > > Hi Krishna,
> > > > >
> > > > > One or also both of our glusterfs clients with that version crash
> > > > > every 3 to 5 days I think. The problem is that there is much
> > > > > throughput (about 30MBit/s on each client with about 99.5% file reads,
> > > > > rest file writes). This makes it hard to debug.
> > > > > We also have a core file from that crash (If I did not deleted it
> > > > > because it was quite big) anyway when the next crash occurs I'll save
> > > > > the core dump for sure.
> > > > > Do you have some idea how to work around that crash?
> > > > > .
> > > > > 2007/8/20, Krishna Srinivas <address@hidden>:
> > > > > > Hi Bernhard,
> > > > > >
> > > > > > Sorry for the late response. We are not able to figure out
> > > > > > the cause for this bug. Do you have the core file?
> > > > > > Is the bug seen regularly?
> > > > > >
> > > > > > Thanks
> > > > > > Krishna
> > > > > >
> > > > > > On 8/16/07, Bernhard J. M. Grün <address@hidden> wrote:
> > > > > > > Hello developers,
> > > > > > >
> > > > > > > We just discovered another segfault on client side. At the moment 
> > > > > > > we
> > > > > > > can't give you more information than our version number, a back 
> > > > > > > trace
> > > > > > > and our client configuration.
> > > > > > >
> > > > > > > We use version 1.3.0 with patches up to patch-449.
> > > > > > >
> > > > > > > The back trace looks as the follows:
> > > > > > > Core was generated by `[glusterfs]
> > > > > > >                               '.
> > > > > > > Program terminated with signal 11, Segmentation fault.
> > > > > > > #0  0x00002aaaaacbc2bd in afr_stat (frame=0x2aaabce32cb0,
> > > > > > >     this=<value optimized out>, loc=0x2aaaac0fe168) at afr.c:2602
> > > > > > > 2602    afr.c: No such file or directory.
> > > > > > >         in afr.c
> > > > > > > (gdb) bt
> > > > > > > #0  0x00002aaaaacbc2bd in afr_stat (frame=0x2aaabce32cb0,
> > > > > > >     this=<value optimized out>, loc=0x2aaaac0fe168) at afr.c:2602
> > > > > > > #1  0x00002aaaaaece1bb in iot_stat (frame=0x2aaabcc00860, 
> > > > > > > this=0x6126d0,
> > > > > > >     loc=0x2aaaac0fe168) at io-threads.c:651
> > > > > > > #2  0x00002aaaab0d2252 in wb_stat (frame=0x2aaaad05c5e0, 
> > > > > > > this=0x612fe0,
> > > > > > >     loc=0x2aaaac0fe168) at write-behind.c:236
> > > > > > > #3  0x0000000000405fd2 in fuse_getattr (req=<value optimized out>,
> > > > > > >     ino=<value optimized out>, fi=<value optimized out>) at 
> > > > > > > fuse-bridge.c:496
> > > > > > > #4  0x0000000000407139 in fuse_transport_notify (xl=<value 
> > > > > > > optimized out>,
> > > > > > >     event=<value optimized out>, data=<value optimized out>)
> > > > > > >     at fuse-bridge.c:2067
> > > > > > > #5  0x00002af562b6a632 in sys_epoll_iteration (ctx=<value 
> > > > > > > optimized out>)
> > > > > > >     at epoll.c:53
> > > > > > > #6  0x000000000040356b in main (argc=9, argv=0x7fff48169b78) at 
> > > > > > > glusterfs.c:387
> > > > > > >
> > > > > > > And here is our client configuration for that machine:
> > > > > > > ### Add client feature and attach to remote subvolume
> > > > > > > volume client1
> > > > > > >   type protocol/client
> > > > > > >   option transport-type tcp/client     # for TCP/IP transport
> > > > > > >   option remote-host 10.1.1.13     # IP address of the remote 
> > > > > > > brick
> > > > > > >   option remote-port 9999              # default server port is 
> > > > > > > 6996
> > > > > > >   option remote-subvolume iothreads        # name of the remote 
> > > > > > > volume
> > > > > > > end-volume
> > > > > > >
> > > > > > > ### Add client feature and attach to remote subvolume
> > > > > > > volume client2
> > > > > > >   type protocol/client
> > > > > > >   option transport-type tcp/client     # for TCP/IP transport
> > > > > > >   option remote-host 10.1.1.14     # IP address of the remote 
> > > > > > > brick
> > > > > > >   option remote-port 9999              # default server port is 
> > > > > > > 6996
> > > > > > >   option remote-subvolume iothreads        # name of the remote 
> > > > > > > volume
> > > > > > > end-volume
> > > > > > >
> > > > > > > volume afrbricks
> > > > > > >   type cluster/afr
> > > > > > >   subvolumes client1 client2
> > > > > > >   option replicate *:2
> > > > > > >   option self-heal off
> > > > > > > end-volume
> > > > > > >
> > > > > > > volume iothreads    #iothreads can give performance a boost
> > > > > > >    type performance/io-threads
> > > > > > >    option thread-count 16
> > > > > > >    subvolumes afrbricks
> > > > > > > end-volume
> > > > > > >
> > > > > > > ### Add writeback feature
> > > > > > > volume bricks
> > > > > > >   type performance/write-behind
> > > > > > >   option aggregate-size 0  # unit in bytes
> > > > > > >   subvolumes iothreads
> > > > > > > end-volume
> > > > > > >
> > > > > > >
> > > > > > > We hope you can easily find and fix that error. Thank you in 
> > > > > > > advance
> > > > > > >
> > > > > > > Bernhard J. M. Grün
> > > > > > >
> > > > > > >
> > > > > > > _______________________________________________
> > > > > > > Gluster-devel mailing list
> > > > > > > address@hidden
> > > > > > > http://lists.nongnu.org/mailman/listinfo/gluster-devel
>




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