Bug 763343 (GLUSTER-1611)

Summary: crash in gf_free
Product: [Community] GlusterFS Reporter: Anush Shetty <anush>
Component: glusterdAssignee: Amar Tumballi <amarts>
Status: CLOSED CURRENTRELEASE QA Contact:
Severity: high Docs Contact:
Priority: low    
Version: mainlineCC: gluster-bugs, vraman
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Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Regression: --- Mount Type: fuse
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Description Anush Shetty 2010-09-15 07:52:35 EDT 
This crash was seen over rdma transport 

gdb) bt
#0  0x00000038b5271d71 in _int_free () from /lib64/libc.so.6
#1  0x00000038b527273b in free () from /lib64/libc.so.6
#2  0x00002b1e70c09758 in __gf_free (free_ptr=0x1d0dcfc8) at mem-pool.c:291
#3  0x00002b1e70bf1d83 in gf_timer_call_cancel (ctx=0x1d0a8010, event=0x1d0dcfc8) at timer.c:132
#4  0x00002b1e70e4b21d in rpc_clnt_reconnect (trans_ptr=0x2aaab0001a18) at rpc-clnt.c:378
#5  0x00002b1e70bf1f4f in gf_timer_proc (ctx=0x1d0a8010) at timer.c:177
#6  0x00000038b5a064a7 in start_thread () from /lib64/libpthread.so.0
#7  0x00000038b52d3c2d in clone () from /lib64/libc.so.6
(gdb) info thr
  5 Thread 4599  0x00000038b52d4018 in epoll_wait () from /lib64/libc.so.6
  4 Thread 4600  0x00000038b5a0e4e8 in do_sigwait () from /lib64/libpthread.so.0
  3 Thread 4601  0x00000038b5a0d5cb in read () from /lib64/libpthread.so.0
  2 Thread 4602  0x00000038b5a0d5cb in read () from /lib64/libpthread.so.0
* 1 Thread 4604  0x00000038b5271d71 in _int_free () from /lib64/libc.so.6
Comment 1 Amar Tumballi 2010-09-17 21:44:53 EDT 
This crash is happening in 'free()', that means its a genuine case of double free. Just reviewing the code, and see that in 'fini()' of rdma.c we are not doing event_unregister() of the socket, which means, we may get stale events on the transport.
Comment 2 Vijay Bellur 2010-09-17 23:35:08 EDT 
PATCH: http://patches.gluster.com/patch/4847 in master (rdma: do event_unregister() in fini() too.)