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Hi glusterfs experts, Good day! In my test env, sometimes glusterd stuck issue happened, and it is not responding to any gluster commands, when I checked this issue I find that glusterd thread 9 and thread 8 is dealing with the same socket, I thought
following patch should be able to solve this issue, however after I merged this patch this issue still exist. When I looked into this code, it seems socket_event_poll_in called event_handled before rpc_transport_pollin_destroy, I think this gives the chance
for another poll for the exactly the same socket. And caused this glusterd stuck issue, also, I find there is no LOCK_DESTROY(&iobref->lock) In iobref_destroy, I think it is better to add destroy lock. Following is the gdb info when this issue happened, I would like to know your opinion on this issue, thanks! SHA-1: f747d55a7fd364e2b9a74fe40360ab3cb7b11537 * socket: fix issue on concurrent handle of a socket GDB INFO: Thread 8 is blocked on pthread_cond_wait, and thread 9 is blocked in iobref_unref, I think
Thread 9 (Thread 0x7f9edf7fe700 (LWP 1933)): #0 0x00007f9ee9fd785c in __lll_lock_wait () from /lib64/libpthread.so.0 #1 0x00007f9ee9fda657 in __lll_lock_elision () from /lib64/libpthread.so.0 #2 0x00007f9eeb24cae6 in iobref_unref (iobref=0x7f9ed00063b0) at iobuf.c:944 #3 0x00007f9eeafd2f29 in rpc_transport_pollin_destroy (pollin=0x7f9ed00452d0) at rpc-transport.c:123 #4 0x00007f9ee4fbf319 in socket_event_poll_in (this=0x7f9ed0049cc0, notify_handled=_gf_true) at socket.c:2322 #5 0x00007f9ee4fbf932 in socket_event_handler (fd=36, idx=27, gen=4, data="" poll_in=1, poll_out=0, poll_err=0) at socket.c:2471 #6 0x00007f9eeb2825d4 in event_dispatch_epoll_handler (event_pool=0x17feb00, event=0x7f9edf7fde84) at event-epoll.c:583 #7 0x00007f9eeb2828ab in event_dispatch_epoll_worker (data="" at event-epoll.c:659 #8 0x00007f9ee9fce5da in start_thread () from /lib64/libpthread.so.0 #9 0x00007f9ee98a4eaf in clone () from /lib64/libc.so.6 Thread 8 (Thread 0x7f9edffff700 (LWP 1932)): #0 0x00007f9ee9fd785c in __lll_lock_wait () from /lib64/libpthread.so.0 #1 0x00007f9ee9fd2b42 in __pthread_mutex_cond_lock () from /lib64/libpthread.so.0 #2 0x00007f9ee9fd44a8 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0 #3 0x00007f9ee4fbadab in socket_event_poll_err (this=0x7f9ed0049cc0, gen=4, idx=27) at socket.c:1201 #4 0x00007f9ee4fbf99c in socket_event_handler (fd=36, idx=27, gen=4, data="" poll_in=1, poll_out=0, poll_err=0) at socket.c:2480 #5 0x00007f9eeb2825d4 in event_dispatch_epoll_handler (event_pool=0x17feb00, event=0x7f9edfffee84) at event-epoll.c:583 #6 0x00007f9eeb2828ab in event_dispatch_epoll_worker (data="" at event-epoll.c:659 #7 0x00007f9ee9fce5da in start_thread () from /lib64/libpthread.so.0 #8 0x00007f9ee98a4eaf in clone () from /lib64/libc.so.6 (gdb) thread 9 [Switching to thread 9 (Thread 0x7f9edf7fe700 (LWP 1933))] #0 0x00007f9ee9fd785c in __lll_lock_wait () from /lib64/libpthread.so.0 (gdb) bt #0 0x00007f9ee9fd785c in __lll_lock_wait () from /lib64/libpthread.so.0 #1 0x00007f9ee9fda657 in __lll_lock_elision () from /lib64/libpthread.so.0 #2 0x00007f9eeb24cae6 in iobref_unref (iobref=0x7f9ed00063b0) at iobuf.c:944 #3 0x00007f9eeafd2f29 in rpc_transport_pollin_destroy (pollin=0x7f9ed00452d0) at rpc-transport.c:123 #4 0x00007f9ee4fbf319 in socket_event_poll_in (this=0x7f9ed0049cc0, notify_handled=_gf_true) at socket.c:2322 #5 0x00007f9ee4fbf932 in socket_event_handler (fd=36, idx=27, gen=4, data="" poll_in=1, poll_out=0, poll_err=0) at socket.c:2471 #6 0x00007f9eeb2825d4 in event_dispatch_epoll_handler (event_pool=0x17feb00, event=0x7f9edf7fde84) at event-epoll.c:583 #7 0x00007f9eeb2828ab in event_dispatch_epoll_worker (data="" at event-epoll.c:659 #8 0x00007f9ee9fce5da in start_thread () from /lib64/libpthread.so.0 #9 0x00007f9ee98a4eaf in clone () from /lib64/libc.so.6 (gdb) frame 2 #2 0x00007f9eeb24cae6 in iobref_unref (iobref=0x7f9ed00063b0) at iobuf.c:944 944 iobuf.c: No such file or directory. (gdb) print *iobref $1 = {lock = {spinlock = 2, mutex = {__data = {__lock = 2, __count = 222, __owner = -2120437760, __nusers = 1, __kind = 8960, __spins = 512,
__elision = 0, __list = {__prev = 0x4000, __next = 0x7f9ed00063b000}},
__size = "\002\000\000\000\336\000\000\000\000\260\234\201\001\000\000\000\000#\000\000\000\002\000\000\000@\000\000\000\000\000\000\000\260c\000О\177", __align = 953482739714}}, ref = -256, iobrefs = 0xffffffffffffffff,
alloced = -1, used = -1} (gdb) quit A debugging session is active. |
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