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

[Anand Avati]

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 at gmail.com>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=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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