mod_fastcgi and spawn-fcgi USR1 signal handling
|Missing in 1.5.x:|
Hi, i'm currently having a weird behavior using lighttpd + fastcgi + some rails app :
if i let lighttpd spawn the rails app (configured to use kill-signal 10), stopping lighttpd won't kill the app.
Sending USR1 kill signal manually to the rails app doesn't stop it either.
if i use spawn-fcgi, and send a kill-signal USR1 (10) to the spawned process, it stops gracefully.
Do lighttpd 1.4.23 use the same code base as spawn-fcgi to manage the spawning ?
Why not ? Isn't it redundant ?
#1 Updated by stbuehler about 5 years ago
lighttpd ignores SIG_USR1, which is inherited trough exec():
Except for SIGCHLD, signals set to be ignored (SIG_IGN) by the calling process image shall be set to be ignored by the new process image.
I guess resetting the ignored signals to the default behaviour should fix this.
#7 Updated by kapouer about 5 years ago
also note that i got several other spawned processes :
www-data 27248 1 0 16:47 ? 00:00:00 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf www-data 27251 27248 1 16:47 ? 00:00:00 /usr/bin/php-cgi www-data 27255 27251 0 16:47 ? 00:00:00 /usr/bin/php-cgi www-data 27257 27251 0 16:47 ? 00:00:00 /usr/bin/php-cgi www-data 27258 27248 32 16:47 ? 00:00:00 /usr/bin/octave -qf /home/dev/WORKSPACES/climelioth/octave/main.m --fcgi www-data 27259 27248 32 16:47 ? 00:00:00 /usr/bin/octave -qf /home/dev/WORKSPACES/climelioth/octave/main.m --fcgi www-data 27260 27248 3 16:47 ? 00:00:00 /home/dev/public_html/webkitpdf/webkitpdf-fcgi www-data 27261 27248 72 16:47 ? 00:00:00 ruby /usr/share/redmine/public/dispatch.fcgi www-data 27262 27248 69 16:47 ? 00:00:00 ruby /usr/share/redmine/public/dispatch.fcgi
all of them are configured with "kill-signal" => 10,
only the ruby ones don't quit.
if i stop lighttpd just after i start it (within 3 seconds or less) the ruby processes quit gracefully.
if i wait 10 seconds, then they don't. Maybe it's something with ruby, too ?
#10 Updated by kapouer about 5 years ago
it is still buggy with the patch, but something strange is happening :
when i start lighttpd, i have two ruby processes launched
if i don't use the ruby webapp (here it's redmine), then stop lighttpd, the two instances are not killed.
if i use the webapp, browse some pages, then stop lighttpd, ONE instance is killed, not the other.
#12 Updated by kapouer about 5 years ago
i checked again, the answer is no.
i tried on the other fastcgi instances, and it works on them.
i also added logs to see if lighttpd was sending the signal,
and i can confirm that :
is called (in mod_fastcgi_free) with the right parameters :
i compared the proc->pid with pids of running ruby instances,
and also the kill-signal was correct.
I guess there is some weird interaction between ruby and the
way lighttpd spawns processes compared to the way spawn-fcgi spawns
#14 Updated by stbuehler about 5 years ago
- Status changed from Reopened to Invalid
Let me summarize:
- lighty resets default signal behaviour (so it should be the same as spawn-fcgi)
- lighty does the correct kill() call
I don't think that is our problem, sry. (As it works with spawn-fcgi, just use spawn-fcgi. It is the right thing anyway :) )
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