I wrote:
Here is what happened when I tried to reload lighttpd while looking
with strace whan systemd is doing:
[ 3639.047649] systemd[1]: Assertion 's->control_command_id ==
SERVICE_EXEC_START' failed at src/service.c:2184, function
service_run_next_main(). Aborting.
[ 3639.052182] systemd[1]: Caught <ABRT>, dumped core as pid 6045.
[ 3639.052376] systemd[1]: Freezing execution.
I could not reproduce the bug without stracing systemd:
strace -ff -e process -p 1
Now I can reproduce it more reliably without strace. Here is the
slightly modified service file:
[Unit]
Description=Lighttpd Web Server
After=network.target
[Service]
Type=forking
PIDFile=/var/run/lighttpd.pid
#ExecStartPre=/usr/sbin/lighttpd -t -f /etc/lighttpd/lighttpd.conf
ExecStart=/usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
ExecStop=/bin/kill -INT $MAINPID
#ExecReload=/usr/sbin/lighttpd -t -f /etc/lighttpd/lighttpd.conf
ExecReload=/bin/kill -INT $MAINPID
ExecReload=/bin/sleep 1
ExecReload=/usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
StandardOutput=syslog
StandardError=syslog
[Install]
WantedBy=multi-user.target
WantedBy=http-daemon.target
To reproduce, I just have to do some attempts of "start, stop, start
again, reload" actions, with 30-second pauses between them. Reproduction
is not 100% reliable.
Here is the output of "systemctl status lighttpd.service" just before
issuing the "reload" command that triggered the assertion:
home ~ # systemctl status lighttpd.service
lighttpd.service - Lighttpd Web Server
Loaded: loaded (/etc/systemd/system/lighttpd.service)
Active: active (running) since Mon, 10 Jan 2011 17:18:44 +0500;
1s ago
Process: 2382 (/bin/kill -INT $MAINPID, code=exited, status=1/FAILURE)
Process: 2390 (/usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf,
code=exited, status=0/SUCCESS)
Main PID: 2393 (lighttpd)
CGroup: name=systemd:/system/lighttpd.service
└ 2393 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
Here is the backtrace, according to my core file:
#0 0x00007fe1316b7acb in raise () from /lib/libpthread.so.0
#1 0x0000000000408f6b in crash (sig=6) at src/main.c:118
#2 <signal handler called>
#3 0x00007fe130923b25 in raise () from /lib/libc.so.6
#4 0x00007fe130925330 in abort () from /lib/libc.so.6
#5 0x0000000000456ff7 in log_assert (file=0x473cb3 "src/service.c",
line=2184, func=<value optimized out>,
format=<value optimized out>) at src/log.c:492
#6 0x00000000004206f0 in service_run_next_main (u=0x2721990, pid=2393,
code=1, status=0) at src/service.c:2184
#7 service_sigchld_event (u=0x2721990, pid=2393, code=1, status=0) at
src/service.c:2525
#8 0x000000000040c1af in manager_dispatch_sigchld (m=0x25bb1c0) at
src/manager.c:2011
#9 0x00000000004117e3 in manager_process_signal_fd (m=0x25bb1c0) at
src/manager.c:2186
#10 process_event (m=0x25bb1c0) at src/manager.c:2211
#11 manager_loop (m=0x25bb1c0) at src/manager.c:2345
#12 0x000000000040a1e5 in main (argc=<value optimized out>, argv=<value
optimized out>) at src/main.c:1166
--
Alexander E. Patrakov
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