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
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