Date: Sun, 1 Jan 2012 16:18:07 +0400 From: Oleg Ginzburg <olevole@olevole.ru> To: freebsd-current@freebsd.org Cc: Ryan Stone <rysto32@gmail.com> Subject: Re: segfault from php/freebsd/dtrace Message-ID: <201201011618.08008.olevole@olevole.ru> In-Reply-To: <CAFMmRNzartSa=1tnjge2Mp3TEWcZH0apZa3G9SgmV2f0zYRmCQ@mail.gmail.com> References: <201112292137.33189.olevole@olevole.ru> <CAFMmRNzartSa=1tnjge2Mp3TEWcZH0apZa3G9SgmV2f0zYRmCQ@mail.gmail.com>
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On Saturday 31 December 2011 23:25:51 Ryan Stone wrote: > On Thu, Dec 29, 2011 at 12:37 PM, Oleg Ginzburg <olevole@olevole.ru> wrote: > > Hi maillist, > > > > I try to use dtrace + php/dtrace on the freebsd. In certain cases ive get > > Segmentation fault and don't understand what of subsystem has a problem. > > Yes, Userland DTrace is unfortunately still very experimental at this > point. I've got a list of at least 10 outstanding bugs that I hope to > start addressing early in the new year. > > In your case, dtrace(1) and/or libproc does not clean up after itself > properly in the case of an error. I can assume that it is: --//Cut of /usr/src/gnu/usr.bin/gdb/libgdb/fbsd-threads.c//-- if (fbsd_thread_active) { gdb_assert (proc_handle.pid == 0); << Here is 484 string mentioned by backtrace << fbsd_thread_active = 0; } --- related with the first process php which I start for providing php dtrace probes. Thanks to this process other code passes through php/dtrace and this process doesn't stop. Last action by backtrace is: #0 0x00000008021c6a37 in strlen () from /lib/libc.so.7 Unfortunately at the expense of DEBUG symbols, process have a bit more memory, so this problem isn't present and i couldn't see value of variables in this place and whence it is caused. > I'm not entirely sure what is > causing the segfault in php, though. Which version are you running? > The output of uname -a would be helpful. At the moment of test (on December, 23th) it there was last version 9- RELENG/amd64 from SVN %uname -a: FreeBSD fbsd-strace.my.domain 9.0-PRERELEASE FreeBSD 9.0-PRERELEASE #0: Fri Dec 23 16:56:09 MSK 2011 root@t.my.domain:/usr/obj/usr/src/sys/G-DTRACE amd64 Kernel config: %cat /sys/amd64/conf/G-DTRACE include GENERIC ident G-DTRACE options KDTRACE_HOOKS # all architectures - enable general DTrace hooks options DDB_CTF # all architectures - kernel ELF linker loads CTF data options KDTRACE_FRAME # amd64 - ensure frames are compiled in makeoptions WITH_CTF=1 #nomakeoptions DEBUG #nooptions COMPAT_FREEBSD4 # Compatible with FreeBSD4 #nooptions COMPAT_FREEBSD5 # Compatible with FreeBSD5 #nooptions COMPAT_FREEBSD6 # Compatible with FreeBSD6 #nooptions COMPAT_FREEBSD7 # Compatible with FreeBSD7 %cat /etc/make.conf WITH_CTF=1 > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
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