Some more info:
I tried to do some debugging with strace:
# dibbler-info start
# ps -Lf -C dibbler-client
UID PID PPID LWP C NLWP STIME TTY TIME CMD
root 4590 1 4590 0 1 20:10 ? 00:00:00 dibbler-client
start
# strace dibbler-client stop &
...
write(3, "2012.06.03 20:10:49 Client Notic"..., 103) = 103
stat("/var/lib/dibbler/client.pid", {st_mode=S_IFREG|0640, st_size=4, ...}) =
0
open("/var/lib/dibbler/client.pid", O_RDONLY) = 4
read(4, "4590", 8191) = 4
read(4, "", 8191) = 0
close(4) = 0
ptrace(PTRACE_ATTACH, 4590, 0, 0) = 0
--- SIGCHLD (Child exited) @ 0 (0) ---
write(1, "Sending TERM signal to process 4"..., 36Sending TERM signal to
process 4590
) = 36
kill(4590, SIGTERM) = 0
write(1, "Waiting for signalled process te"..., 45Waiting for signalled
process termination... ) = 45
wait4(4590, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGSTOP}], 0, NULL) = 4590
ptrace(PTRACE_CONT, 4590, 0, SIGSTOP) = 0
--- SIGCHLD (Child exited) @ 0 (0) ---
wait4(4590, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGSTOP}], 0, NULL) = 4590
ptrace(PTRACE_CONT, 4590, 0, SIGSTOP) = 0
wait4(4590,
// here the trace hangs until I issue '# kill 4590' from another terminal,
// then it continues with
[{WIFSTOPPED(s) && WSTOPSIG(s) == SIGTERM}], 0, NULL) = 4590
--- SIGCHLD (Child exited) @ 0 (0) ---
ptrace(PTRACE_CONT, 4590, 0, SIGTERM) = 0
wait4(4590, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGCHLD}], 0, NULL) = 4590
--- SIGCHLD (Child exited) @ 0 (0) ---
ptrace(PTRACE_CONT, 4590, 0, SIGCHLD) = 0
wait4(4590, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGCHLD}], 0, NULL) = 4590
--- SIGCHLD (Child exited) @ 0 (0) ---
ptrace(PTRACE_CONT, 4590, 0, SIGCHLD) = 0
wait4(4590, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 4590
--- SIGCHLD (Child exited) @ 0 (0) ---
ptrace(PTRACE_CONT, 4590, 0, SIG_0) = -1 ESRCH (No such process)
write(1, "Done.\n", 6Done.
) = 6
close(3) = 0
munmap(0x7f0a452be000, 4096) = 0
exit_group(0) = ?
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