Hi Guys,
I'm doing a robust test on a ramips 7620a chip, with a customized openwrt
firmware. I ran into this rare issue recently.
The system initialization stopped right before /etc/rc.d/ processing. Chances
are around 5%.
After some debug work, I located the key code that caused the issue.
In procd/rcS.c, static void q_initd_run(...), I added a DEBUG log.
76 pid = fork();
77 if (pid < 0)
78 {
79 DEBUG(0, "in pid %d, fork failed! %s\n", getpid(), strerror(errno));
80 return;
81 }
In /etc/rc.local, I added 2 lines to make the system reboot in 20s.
sleep 20
reboot
Then the system would keep rebooting. After a couple of hours, the system
stopped rebooting. From the log, I saw:
procd: q_initd_run(70): start /etc/rc.d/S10boot boot
procd: q_initd_run(79): in pid 1, fork failed! Function not implemented
After it happened, I checked the memory usage, there was more than 6MB free
memory.
In most cases, fork() in rcS.c works fine. The error "fork Function not
implemented" is quite suspicious.
Any idea?
======================
Hua Shao
======================
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