Date: Tue, 18 Oct 2011 16:53:28 +0200 From: Ivan Voras <ivoras@freebsd.org> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-stable@freebsd.org Subject: Re: Setting coredumpsize on a running process? Message-ID: <CAF-QHFWX3zFjskA4WOhgh%2B9E5Ap139_E3gvE5vkM_b2xgoQfjQ@mail.gmail.com> In-Reply-To: <20111018144312.GA17496@icarus.home.lan> References: <j7k2lb$k85$1@dough.gmane.org> <20111018144312.GA17496@icarus.home.lan>
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On 18 October 2011 16:43, Jeremy Chadwick <freebsd@jdc.parodius.com> wrote: > On Tue, Oct 18, 2011 at 04:32:11PM +0200, Ivan Voras wrote: >> I have PHP executing as fastcgi via the mod_fcgid module in Apache. I >> suspect there is a bug in PHP or one of its extensions which causes it >> to crash with sigsegv, but I cannot get any coredumps. I suspect >> something is setting coredumpsize to 0 - either Apache, mod_fcgid or PHP= . >> >> So the question is: is there a way to set coredumpsize on a running >> process, with the intention of getting a core dump when it crashes? I >> already tried setting CoreDumpDirectory in Apache and also configuring >> apache22limits_args in /etc/rc.conf but without effect. > > I ended up solving this on a machine where coredumps with Apache + PHP > were highly common by setting sysctl kern.corefile to > /var/cores/%P.%N.core, then made sure the /var/cores directory was > root:wheel, perms 1777. =C2=A0Otherwise I could not get a coredump. > apache22limits_enable did not help either, nor did CoreDumpDirectory. > Having fun yet? Oh, I have years and years of fun debugging PHP, in one way or the other :) Your suggestion for setting core dump directory explicitely helped; now it looks like I've hit an infinite recursion / stack eating bug somewhere in PCRE... #1703 0x0000000805d5c72e in match () from /usr/local/lib/libpcre.so.0 #1704 0x0000000805d5b4f0 in match () from /usr/local/lib/libpcre.so.0 #1705 0x0000000805d5c72e in match () from /usr/local/lib/libpcre.so.0 #1706 0x0000000805d5b4f0 in match () from /usr/local/lib/libpcre.so.0 However, I'm drawing the line at debugging PCRE, this will go into the "don't do that" category.
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