On Tue, Nov 15, 2011 at 11:07:45AM +0200, Kostik Belousov wrote: > On Mon, Nov 14, 2011 at 12:51:35PM -0800, Doug Barton wrote: > > On 11/14/2011 12:31, Doug Barton wrote: > > > Trying to track down a load problem we're seeing on 8.2-RELEASE-p4 i386 > > > in a busy web hosting environment I came across the following post: > > > > > > http://lists.freebsd.org/pipermail/freebsd-questions/2011-October/234520.html > > > > > > That basically describes what we're seeing as well, including the > > > "doesn't happen on Linux" part. > > > > > > Does anyone have any ideas about this? > > > > > > With incredibly similar stuff running on 7.x we didn't see this problem, > > > so it seems to be something new in 8. > > > > Just took a closer look at our ktrace, and actually our pattern is > > slightly different than the one in that post. In ours the second option > > is null, but the third is set: > > > > 74195 httpd 0.000017 RET sigprocmask 0 > > 74195 httpd 0.000013 CALL sigprocmask(SIG_BLOCK,0,0xbfbf89d4) > > 74195 httpd 0.000009 RET sigprocmask 0 > > 74195 httpd 0.000013 CALL sigprocmask(SIG_BLOCK,0,0xbfbf89d4) > > 74195 httpd 0.000009 RET sigprocmask 0 > > 74195 httpd 0.000012 CALL sigprocmask(SIG_BLOCK,0,0xbfbf89d4) > > > > But repeated hundreds of times in a row. > > The calls cannot come from rtld, they are generated by some setjmp() > invocation. If signal-safety is not needed, sigsetjmp() should be used > instead. > > Quick grep of the apache httpd source shows a single setjmp() in their > copy of pcre. No idea is it to safe to change setjmp() into sigsetjmp(?, 0).
I hate cross-posting, but: adding freebsd-apache@ to the list. Some of the Apache folks (not just port committers) may have some insight to Kostik's findings. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, US | | Making life hard for others since 1977. PGP 4BD6C0CB | _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
