Date: Fri, 18 Nov 2011 11:19:37 +0200 From: Kostik Belousov <kostikbel@gmail.com> To: Doug Barton <dougb@freebsd.org> Cc: Daniil Cherednik <dcherednik@masterhost.ru>, freebsd-apache@freebsd.org, freebsd-stable@freebsd.org Subject: Re: 8.2 + apache == a LOT of sigprocmask Message-ID: <20111118091937.GA50300@deviant.kiev.zoral.com.ua> In-Reply-To: <4EC610B9.8080406@FreeBSD.org> References: <4EC17F57.5030008@FreeBSD.org> <20111115090745.GO50300@deviant.kiev.zoral.com.ua> <20111115100904.GA92795@icarus.home.lan> <4EC4ADC3.2060604@FreeBSD.org> <20111117074909.GL50300@deviant.kiev.zoral.com.ua> <4EC4BECA.5040705@FreeBSD.org> <20111117081210.GN50300@deviant.kiev.zoral.com.ua> <4EC4D359.4040406@FreeBSD.org> <20111117105744.GS50300@deviant.kiev.zoral.com.ua> <4EC610B9.8080406@FreeBSD.org>
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--ZEJo5p0yAM1jsdkh Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Nov 18, 2011 at 12:00:57AM -0800, Doug Barton wrote: > On 11/17/2011 02:57, Kostik Belousov wrote: > >> > It's not catching there though: > >> >=20 > >> > Reading symbols from /libexec/ld-elf.so.1...done. > >> > Loaded symbols for /libexec/ld-elf.so.1 > >> > 0x28183b2d in accept () at accept.S:3 > >> > 3 RSYSCALL(accept) > >> > (gdb) c > >> > Continuing. > >> > no thread to satisfy query > >> > 0x28183b2d in accept () at accept.S:3 > >> > 3 RSYSCALL(accept) > >> > (gdb) info threads > >> > Cannot get thread info: invalid key > >> > (gdb) > > Err, the other part of my message was that you shall set the breakpoint > > on sigprocmask. >=20 > I'm sorry I'm not making myself clear. We are setting the breakpoint on > sigprocmask. But, maybe I'm doing it wrong. Can you give precise > instructions as to what you want me to do, from the beginning? Sorry to > be so dense. Find the pid of the process issuing excessive number of sigprocmask calls. Do $ gdb /usr/local/bin/httpd (gdb) attach <pid> (gdb) b _sigprocmask (gdb) c Bah ! Breakpoint fired. (gdb) bt (gdb) c <... Repeat ... > >=20 > > I want to see a backtrace from the breakpoint hit. > > Several times. >=20 > Me too. :) >=20 > Meanwhile, in response to one of the other questions, we are using > mpm_prefork. Also, the particular problem we're seeing does not appear > related to fork(). The pattern of sigprocmask() calls is different from > the pattern you see with fork(). I am sure that your sigprocmask calls do not come from rtld, it is some use of setjmp or sigsetjmp(1), most likely. I am not aware of any significant users of setjmp or sigprocmask in our system libraries. >=20 >=20 > Doug >=20 > --=20 >=20 > "We could put the whole Internet into a book." > "Too practical." >=20 > Breadth of IT experience, and depth of knowledge in the DNS. > Yours for the right price. :) http://SupersetSolutions.com/ --ZEJo5p0yAM1jsdkh Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) iEYEARECAAYFAk7GIykACgkQC3+MBN1Mb4gPtwCdEwGLoFiLVJsgTwpmRYNkeXd0 yuEAnj5wdYlX5mJ9r/3oWnVWsQviyC5J =tAQC -----END PGP SIGNATURE----- --ZEJo5p0yAM1jsdkh--
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