Lighttpd

machine env: almost 0 traffic/request, full cpu usage, disk io busy.

i don't have the strace when it's stopping.

2006-03-27 17:23:26: (src/log.c.75) server started 
2006-03-27 18:22:00: (src/mod_rrdtool.c.398) rrdtool-read: failed Interrupted system call 
2006-03-27 18:22:00: (src/server.c.1085) one of the triggers failed 
2006-03-27 21:26:39: (src/log.c.135) server stopped
(manually) 
2006-03-27 21:26:42: (src/log.c.75) server started 
2006-03-28 19:19:00: (src/mod_rrdtool.c.398) rrdtool-read: failed Interrupted system call 
2006-03-28 19:19:00: (src/server.c.1085) one of the triggers failed

# strace -p `pidof rrdtool`
Process 11484 attached - interrupt to quit
read(0,  <unfinished ...>
Process 11484 detached (CTRL+C)

# strace -p `pidof lighttpd`
Process 11480 attached - interrupt to quit
time(NULL)                              = 1143634917
epoll_wait(8, {}, 10231, 1000)          = 0
time(NULL)                              = 1143634918
epoll_wait(8, {}, 10231, 1000)          = 0
time(NULL)                              = 1143634919
epoll_wait(8, {}, 10231, 1000)          = 0
time(NULL)                              = 1143634920
epoll_wait(8,  <unfinished ...>
Process 11480 detached (CTRL+C)

i guess it take more than 1 seconds to read() in mod_rrdtool.c because rrdtool take some time to update data to disk, as disk io is already heavy busy. and another lighttpd trigger/alarm kill the read() in progress.