(gdb) thread apply all bt

Thread 9 (Thread 0x7fa60eada740 (LWP 16211)):
#0  0x00007fa60cc546d5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fa60e2100b9 in syncop_flush (subvol=0x7fa5f402e650, fd=0x19da74c, xdata_in=0x0, xdata_out=0x0)
    at syncop.c:2359
#2  0x00007fa60e4ab3b3 in pub_glfs_close (glfd=0x19da670) at glfs-fops.c:270
#3  0x0000000000400b48 in main (argc=<optimized out>, argv=<optimized out>) at libgfapi_zero.c:130

Thread 8 (Thread 0x7fa5f932d700 (LWP 16219)):
#0  0x00007fa60d87c7f3 in epoll_wait () from /lib64/libc.so.6
#1  0x00007fa60e229f53 in event_dispatch_epoll_worker (data=0x7fa5f405f670) at event-epoll.c:664
#2  0x00007fa60cc50dc5 in start_thread () from /lib64/libpthread.so.0
#3  0x00007fa60d87c21d in clone () from /lib64/libc.so.6

Thread 7 (Thread 0x7fa601a30700 (LWP 16218)):
#0  0x00007fa60cc55225 in pthread_spin_lock () from /lib64/libpthread.so.0
#1  0x00007fa60e1f373e in iobref_unref (iobref=0x19dc7e0) at iobuf.c:907
#2  0x00007fa60e246fb2 in args_wipe (args=0x19e70ec) at default-args.c:1593
#3  0x00007fa60e1ea534 in call_stub_wipe_args (stub=0x19e709c) at call-stub.c:2466
#4  0x00007fa60e1ea5de in call_stub_destroy (stub=0x19e709c) at call-stub.c:2482
#5  0x00007fa5fad822bb in __wb_request_unref (req=0x19e8860) at write-behind.c:369
#6  0x00007fa5fad83279 in __wb_fulfill_request (req=0x19e8860) at write-behind.c:677
#7  0x00007fa5fad8370d in wb_head_done (head=0x19e8860) at write-behind.c:831
#8  0x00007fa5fad83c14 in wb_fulfill_cbk (frame=0x19d88cc, cookie=0x19e4eec, this=0x7fa5f4026010, op_ret=131072,
    op_errno=0, prebuf=0x7fa5f409cdfc, postbuf=0x7fa5f409ce6c, xdata=0x7fa5f409cbdc) at write-behind.c:1000
#9  0x00007fa5fb001f30 in dht_writev_cbk (frame=0x19e4eec, cookie=0x19e501c, this=0x7fa5f40246e0, op_ret=131072,
    op_errno=0, prebuf=0x7fa5f409cdfc, postbuf=0x7fa5f409ce6c, xdata=0x7fa5f409cbdc) at dht-inode-write.c:106
#10 0x00007fa60e2607a1 in default_writev_cbk (frame=0x19e501c, cookie=0x19ee75c, this=0x7fa5f401f9f0,
    op_ret=131072, op_errno=0, prebuf=0x7fa5f409cdfc, postbuf=0x7fa5f409ce6c, xdata=0x7fa5f409cbdc)
    at defaults.c:1242
#11 0x00007fa5fb27284d in ec_manager_writev (fop=0x19ee75c, state=5) at ec-inode-write.c:1544
#12 0x00007fa5fb24ea4b in __ec_manager (fop=0x19ee75c, error=0) at ec-common.c:2204
#13 0x00007fa5fb24a4d2 in ec_resume (fop=0x19ee75c, error=0) at ec-common.c:289
#14 0x00007fa5fb24a6fa in ec_complete (fop=0x19ee75c) at ec-common.c:362
#15 0x00007fa5fb26c281 in ec_inode_write_cbk (frame=0x19e514c, this=0x7fa5f401f9f0, cookie=0x2, op_ret=65536,
    op_errno=0, prestat=0x7fa601a2f900, poststat=0x7fa601a2f890, xdata=0x7fa5f409cbdc) at ec-inode-write.c:64
#16 0x00007fa5fb271f0b in ec_writev_cbk (frame=0x19e514c, cookie=0x2, this=0x7fa5f401f9f0, op_ret=65536,
    op_errno=0, prestat=0x7fa601a2f900, poststat=0x7fa601a2f890, xdata=0x7fa5f409cbdc) at ec-inode-write.c:1405
#17 0x00007fa5fb4fab53 in client3_3_writev_cbk (req=0x7fa5f0010bbc, iov=0x7fa5f0010bfc, count=1,
    myframe=0x7fa5f000c56c) at client-rpc-fops.c:859
#18 0x00007fa60df8431b in rpc_clnt_handle_reply (clnt=0x7fa5f408d650, pollin=0x7fa5f4001850) at rpc-clnt.c:759
#19 0x00007fa60df847ef in rpc_clnt_notify (trans=0x7fa5f408db30, mydata=0x7fa5f408d680,
    event=RPC_TRANSPORT_MSG_RECEIVED, data=0x7fa5f4001850) at rpc-clnt.c:920
#20 0x00007fa60df80b85 in rpc_transport_notify (this=0x7fa5f408db30, event=RPC_TRANSPORT_MSG_RECEIVED,
    data=0x7fa5f4001850) at rpc-transport.c:541
#21 0x00007fa60101e02d in socket_event_poll_in (this=0x7fa5f408db30) at socket.c:2349
#22 0x00007fa60101e56a in socket_event_handler (fd=14, idx=5, data=0x7fa5f408db30, poll_in=1, poll_out=0,
    poll_err=0) at socket.c:2462
#23 0x00007fa60e229b68 in event_dispatch_epoll_handler (event_pool=0x1992680, event=0x7fa601a2fee0)
    at event-epoll.c:571
#24 0x00007fa60e229f85 in event_dispatch_epoll_worker (data=0x7fa5fc000920) at event-epoll.c:674
#25 0x00007fa60cc50dc5 in start_thread () from /lib64/libpthread.so.0
#26 0x00007fa60d87c21d in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7fa602231700 (LWP 16217)):
#0  0x00007fa60cc51ef7 in pthread_join () from /lib64/libpthread.so.0
#1  0x00007fa60e22a1a7 in event_dispatch_epoll (event_pool=0x1992680) at event-epoll.c:758
#2  0x00007fa60e1edd2c in event_dispatch (event_pool=0x1992680) at event.c:124
#3  0x00007fa60e4a5dfb in glfs_poller (data=0x191c010) at glfs.c:612
#4  0x00007fa60cc50dc5 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fa60d87c21d in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7fa602c35700 (LWP 16216)):
#0  0x00007fa60d84342d in nanosleep () from /lib64/libc.so.6
---Type <return> to continue, or q <return> to quit---
#1  0x00007fa60e1cd09b in gf_timer_proc (data=0x199b7a0) at timer.c:176
#2  0x00007fa60cc50dc5 in start_thread () from /lib64/libpthread.so.0
#3  0x00007fa60d87c21d in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7fa60995d700 (LWP 16215)):
#0  0x00007fa60cc54a82 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fa60e204046 in syncenv_task (proc=0x1995c30) at syncop.c:603
#2  0x00007fa60e2042e6 in syncenv_processor (thdata=0x1995c30) at syncop.c:695
#3  0x00007fa60cc50dc5 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fa60d87c21d in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7fa60a15e700 (LWP 16214)):
#0  0x00007fa60cc54a82 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fa60e204046 in syncenv_task (proc=0x1995870) at syncop.c:603
#2  0x00007fa60e2042e6 in syncenv_processor (thdata=0x1995870) at syncop.c:695
#3  0x00007fa60cc50dc5 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fa60d87c21d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fa60b55f700 (LWP 16213)):
#0  0x00007fa60cc54a82 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fa60e204046 in syncenv_task (proc=0x1958400) at syncop.c:603
#2  0x00007fa60e2042e6 in syncenv_processor (thdata=0x1958400) at syncop.c:695
#3  0x00007fa60cc50dc5 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fa60d87c21d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fa60bd60700 (LWP 16212)):
#0  0x00007fa60cc54a82 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fa60e204046 in syncenv_task (proc=0x1958040) at syncop.c:603
#2  0x00007fa60e2042e6 in syncenv_processor (thdata=0x1958040) at syncop.c:695
#3  0x00007fa60cc50dc5 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fa60d87c21d in clone () from /lib64/libc.so.6