Re: Segfault at client3_3_create_cbk() when calling fops->create

[Anand Avati <anand.avati@xxxxxxxxx>]

The frame which you used for doing the STACK_WIND(create) was probably unwound by the time the create_cbk came back from the server? This is the most common/likely cause..

Avati

On Thu, Oct 11, 2012 at 1:59 PM, Gustavo Bervian Brand <gugabrand@xxxxxxxxx> wrote:

Hello,

  I gave up of using syncop calls at my attempt of copy a file to a local node while the read is happening (at each readv_cbk in this case)... it was failing often and I could not benefit from the frame->local isolation between the readv/readv_cbk/<syncop calls> because the local context was lost when inside the function called by synctask_new.

  Anyway, I built a logic with wind/unwind calls instead, and I am getting a strange fault to begin with, out of my translator. At the readv_cbk() I am calling xl->fops->create with most of the parameters I was using with syncop_create (the fd, loc, flags, etc were created and populated locally while in the readv_cbk), but the execution is stopping at the path below because the myframe->local is NULL and the fd cannot be gathered at client3_3_create_cbk().

  At the backend the file was created (but not yet populated or set with attributes). 

  Does this kind of behavior is known, a bug for an unusual scenario, or what I am missing here?

Program received signal SIGSEGV, Segmentation fault.

0x00007ffff3bc964f in client3_3_create_cbk (req=0x7ffff36751a4, iov=0x7ffff36751e4, count=1, myframe=0x7ffff5dcb2dc) at client-rpc-fops.c:2008

2008            fd    = local->fd;

(gdb)

(gdb) bt

#0  0x00007ffff3bc964f in client3_3_create_cbk (req=0x7ffff36751a4, iov=0x7ffff36751e4, count=1, myframe=0x7ffff5dcb2dc) at client-rpc-fops.c:2008

#1  0x00007ffff7944e8b in rpc_clnt_handle_reply (clnt=0x693860, pollin=0x6e5d80) at rpc-clnt.c:784

#2  0x00007ffff79451fc in rpc_clnt_notify (trans=0x6a3290, mydata=0x693890, event=RPC_TRANSPORT_MSG_RECEIVED, data="" at rpc-clnt.c:903

#3  0x00007ffff79416bb in rpc_transport_notify (this=0x6a3290, event=RPC_TRANSPORT_MSG_RECEIVED, data="" at rpc-transport.c:495

#4  0x00007ffff3466e20 in socket_event_poll_in (this=0x6a3290) at socket.c:1986

#5  0x00007ffff34672bd in socket_event_handler (fd=14, idx=1, data="" poll_in=1, poll_out=0, poll_err=0) at socket.c:2097

#6  0x00007ffff7b98fce in event_dispatch_epoll_handler (event_pool=0x6505e0, events=0x6c9c90, i=0) at event.c:784

#7  0x00007ffff7b991ad in event_dispatch_epoll (event_pool=0x6505e0) at event.c:845

#8  0x00007ffff7b99494 in event_dispatch (event_pool=0x6505e0) at event.c:945

#9  0x0000000000408ae0 in main (argc=7, argv=0x7fffffffe568) at glusterfsd.c:1814

Best,
Gustavo Bervian Brand
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