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While running the CI tests Kamctl / MI fifo was hanging, after further investigation it seems it was trying to acquire a lock while the DMK module was stuck using it.
Processes
Process:: ID=0 PID=6 Type=main process - attendant
Process:: ID=1 PID=168 Type=udp receiver child=0 sock=0.0.0.0:5060 ! (172.19.0.12:5060) !
Process:: ID=2 PID=169 Type=udp receiver child=1 sock=0.0.0.0:5060 (172.19.0.12:5060) !
Process:: ID=3 PID=170 Type=slow timer
Process:: ID=4 PID=171 Type=timer
Process:: ID=5 PID=172 Type=secondary timer
Process:: ID=6 PID=173 Type=MI FIFO
Process:: ID=7 PID=174 Type=ctl handler !
Process:: ID=8 PID=175 Type=RTIMER SEC EXEC
Process:: ID=9 PID=176 Type=RTIMER SEC EXEC
Process:: ID=10 PID=177 Type=HTable Timer
Process:: ID=11 PID=178 Type=USRLOC Timer
Process:: ID=12 PID=179 Type=USRLOC Timer
Process:: ID=13 PID=180 Type=TIMER NH
Process:: ID=14 PID=181 Type=TIMER NH
Process:: ID=15 PID=182 Type=DMQ WORKER
Process:: ID=16 PID=183 Type=DMQ WORKER
Process:: ID=17 PID=184 Type=tcp main process
gdb /usr/sbin/kamailio 173
(gdb) bt
#0 0x0000785ee4f2f042 in __syscall6 (a6=<optimized out>, a5=<optimized out>, a4=<optimized out>, a3=<optimized out>, a2=<optimized out>, a1=<optimized out>, n=202) at ./arch/x86_64/syscall_arch.h:59
#1 syscall (n=n@entry=202) at src/misc/syscall.c:18
#2 0x0000785eb6ec670b in futex_get (lock=0x785eb79215f4) at ../../lib/kcore/../../mem/../futexlock.h:108
#3 0x0000785eb6ecc200 in lock_ulslot (_d=_d@entry=0x785eb7955690, i=i@entry=472189) at udomain.c:1077
#4 0x0000785eb6ec1947 in mi_usrloc_dump (cmd=<optimized out>, param=<optimized out>) at ul_mi.c:451
#5 0x0000785edc4c0fa1 in run_mi_cmd (t=0xa9bbcf24100, cmd=0xa9bbce892e0) at ../../lib/kmi/mi.h:77
#6 mi_fifo_server (fifo_stream=fifo_stream@entry=0xa9bbce8a5a0) at fifo_fnc.c:509
#7 0x0000785edc4c3317 in fifo_process (rank=rank@entry=1) at mi_fifo.c:270
#8 0x0000785edc4c53b4 in mi_child_init (rank=<optimized out>) at mi_fifo.c:234
#9 0x00000a9bb8e9b6e6 in init_mod_child (m=0x785edcf22008, rank=rank@entry=0) at sr_module.c:921
#10 0x00000a9bb8e9b4f0 in init_mod_child (m=0x785edcf22270, rank=rank@entry=0) at sr_module.c:918
#11 0x00000a9bb8e9b4f0 in init_mod_child (m=0x785edcf227f0, rank=rank@entry=0) at sr_module.c:918
#12 0x00000a9bb8e9b4f0 in init_mod_child (m=0x785edcf22d40, rank=rank@entry=0) at sr_module.c:918
#13 0x00000a9bb8e9b4f0 in init_mod_child (m=0x785edcf246d0, rank=rank@entry=0) at sr_module.c:918
#14 0x00000a9bb8e9b4f0 in init_mod_child (m=0x785edcf252f8, rank=rank@entry=0) at sr_module.c:918
gdb /usr/sbin/kamailio 182
(gdb) bt
#0 0x0000785ee4f2f042 in __syscall6 (a6=<optimized out>, a5=<optimized out>, a4=<optimized out>, a3=<optimized out>, a2=<optimized out>, a1=<optimized out>, n=202) at ./arch/x86_64/syscall_arch.h:59
#1 syscall (n=n@entry=202) at src/misc/syscall.c:18
#2 0x0000785eb6ec674e in futex_get (lock=0x785eb79215f4) at ../../lib/kcore/../../mem/../futexlock.h:121
#3 0x0000785eb6ece5f7 in get_urecord_by_ruid (_d=0x785eb7955690, _aorhash=1819751549, _ruid=_ruid@entry=0x785eb68201c0 <ci>, _r=_r@entry=0x7d7464b7e400, _c=_c@entry=0x7d7464b7e410) at udomain.c:1178
#4 0x0000785eb66187b3 in add_contact (ci=0x785eb68201c0 <ci>, aor=...) at usrloc_sync.c:72
#5 usrloc_dmq_handle_msg (msg=<optimized out>, resp=0x7d7464b7e520, node=0x785eb8d5b418) at usrloc_sync.c:429
#6 0x0000785eb682adcc in worker_loop (id=id@entry=0) at worker.c:105
#7 0x0000785eb682c56b in child_init (rank=<optimized out>) at dmq.c:293
#8 0x00000a9bb8e9b6e6 in init_mod_child (m=0x785edcf9fe78, rank=rank@entry=0) at sr_module.c:921
#9 0x00000a9bb8e9b4f0 in init_mod_child (m=0x785edcfa02e0, rank=0) at sr_module.c:918
#10 0x00000a9bb8eacbde in main_loop () at main.c:1682
#11 0x00000a9bb8e6249b in main (argc=<optimized out>, argv=<optimized out>) at main.c:2616
gdb /usr/sbin/kamailio 183
(gdb) bt
#0 0x0000785ee4f2f042 in __syscall6 (a6=<optimized out>, a5=<optimized out>, a4=<optimized out>, a3=<optimized out>, a2=<optimized out>, a1=<optimized out>, n=202) at ./arch/x86_64/syscall_arch.h:59
#1 syscall (n=n@entry=202) at src/misc/syscall.c:18
#2 0x0000785eb6ec670b in futex_get (lock=0x785eb79215f4) at ../../lib/kcore/../../mem/../futexlock.h:108
#3 0x0000785eb661807c in add_contact (ci=0x785eb68201c0 <ci>, aor=...) at usrloc_sync.c:64
#4 usrloc_dmq_handle_msg (msg=<optimized out>, resp=0x7d7464b7e520, node=0x785eb8d5b418) at usrloc_sync.c:429
#5 0x0000785eb682adcc in worker_loop (id=id@entry=1) at worker.c:105
#6 0x0000785eb682c56b in child_init (rank=<optimized out>) at dmq.c:293
#7 0x00000a9bb8e9b6e6 in init_mod_child (m=0x785edcf9fe78, rank=rank@entry=0) at sr_module.c:921
#8 0x00000a9bb8e9b4f0 in init_mod_child (m=0x785edcfa02e0, rank=0) at sr_module.c:918
#9 0x00000a9bb8eacbde in main_loop () at main.c:1682
#10 0x00000a9bb8e6249b in main (argc=<optimized out>, argv=<optimized out>) at main.c:2616
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