Julian Elischer wrote:
julian 2007-10-23 17:54:16 UTC
FreeBSD src repository
Modified files:
sys/kern kern_fork.c
Log:
Take out the single-threading code in fork.
After discussions with jeff, alc, (various Ironport people), david Xu,
and mostly Alfred (who found the problem) it has been demonstrated that this
is not needed for our implementations of threads and represents a real
(as in we've seen it happen a lot) deadlock danger.
...
I think if process is forking a thread, that says flag RFPROC is not
set and flags RFCFDG or RFCFDG is set, you still need to call
thread_single(SINGLE_BOUNDARY), otherwise, for a threaded process,
the memory pointed by p_fd is freed while other threads are using it,
it will cause kernel to panic.
Regards,
David Xu
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