Date: Fri, 27 Jul 2001 07:49:44 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: Ian Dowse <iedowse@maths.tcd.ie> Cc: current@FreeBSD.ORG, stable@FreeBSD.ORG Subject: Re: SIGCHLD changes causing fault on nofault entry panics Message-ID: <200107271449.f6REni269151@earth.backplane.com> References: <200107271451.aa00148@salmon.maths.tcd.ie>
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:In the vmcore I just got, the panic occurred in the following
:fragment in exit1(), when dereferencing p_sigacts (which is
:p_procsig->ps_sigacts). I guess there is a race here if the parent
:is exiting or something?
:
:+ if ((p->p_pptr->p_procsig->ps_flag & PS_NOCLDWAIT)
:+ || p->p_pptr->p_sigacts->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN) {
:
:Matt, I will just back out these changes from RELENG_4 shortly
:until the issue is resolved. The change was non-essential and quite
:contained, so it's probably better than waiting for a fix.
:
:Ian
Ok, I'll take a look at it on the weekend and see if I can track down
where the panic is coming from. I'll be that p_sigacts can wind up
NULL in a reparenting case or something like that.
-Matt
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