On 21 Oct, David Xu wrote:
> davidxu 2006-10-21 23:59:15 UTC
>
> FreeBSD src repository
>
> Modified files:
> sys/kern kern_exit.c
> Log:
> Since revision 1.333 of kern_sig.c no longer uses P_WEXIT, the change
> opened a race window which can cause memory leak in signal queue.
> Here we free memory for signal queue when process state is set to
> PRS_ZOMBIE.
>
> Revision Changes Path
> 1.291 +8 -2 src/sys/kern/kern_exit.c
I wonder if the earlier change is what broke portupgrade after I
upgraded from an August 31st version of current to yesterday's version.
The symptoms were random processes dying from SIGHUP. It was easy to
reproduce by just going to a port directory and running
script foo make clean
a few times. I'd randomly see make complain about a non-zero exit
status from uname or some other sub-process. I tracked the problem back
to the SIGHUP bit being set in td2's sigqueue in fork1(). As a
workaround, I added a call to sigqueue_init() where td2 gets bzero'ed.
Disappearing back into the void ...
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