[Gluster-devel] Segfault at client3_3_create_cbk() when calling fops->create

[Gustavo Bervian Brand]

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=0x6e5d80) at rpc-clnt.c:903
#3  0x00007ffff79416bb in rpc_transport_notify (this=0x6a3290,
event=RPC_TRANSPORT_MSG_RECEIVED, data=0x6e5d80) 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=0x6a3290, 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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