Date: Mon, 10 Dec 2012 13:13:23 -0800 From: Mark Atkinson <atkin901@gmail.com> To: freebsd-current@freebsd.org Cc: kde-freebsd@freebsd.kde.org Subject: Re: problems with threads/destructors in -current with llvm/clang Message-ID: <ka5j9h$pel$1@ger.gmane.org> In-Reply-To: <ka5hl1$919$1@ger.gmane.org> References: <k9qjml$ri7$1@ger.gmane.org> <50C1E81A.1040107@FreeBSD.org> <50C1F862.2010501@FreeBSD.org> <k9t6bq$bhs$1@ger.gmane.org> <50C22789.3030303@FreeBSD.org> <ka56gv$t60$1@ger.gmane.org> <20121210182525.GR3013@kib.kiev.ua> <ka5gmu$129$1@ger.gmane.org> <20121210203331.GV3013@kib.kiev.ua> <ka5hl1$919$1@ger.gmane.org>
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On 12/10/2012 12:45, Mark Atkinson wrote:
> On 12/10/2012 12:33, Konstantin Belousov wrote:
>
>> Hmm. Since I took out -O2 and added -g in rebuilding
>> libthr/libc/rtld, I figured I needed to reproduce a new
>> segfault, but the rtld side of things seems broken:
>>> Use e.g. cd src/libexec/rtld-elf && make DEBUG_FLAGS=-g clean
>>> all install This is really FAQ.
>
>
> It _is_ strange, because I did almost exactly that (dumped a
> temporary DEBUG_FLAGS/CFLAGS in /etc/make.conf)
>
> The one I had problems with was libc since It needs a make depend
> in there.
>
> $ readelf -w /libexec/ld-elf.so.1 |head The section .debug_aranges
> contains:
>
> Length: 28 Version: 2 Offset
> into .debug_info: 0 Pointer Size: 4 Segment Size:
> 0
>
> Address Length 0x00000e80 0x49 $
So ignoring this weirdness, running under valgrind always segfaults
and the core seems useful.
#0 0x0061bd59 in handle_signal (actp=0xbf9fd490, sig=20,
info=0xbf9fd7b0, ucp=0x0) at /usr/src/lib/libthr/thread/thr_sig.c:198
#1 0x0061b71c in thr_sighandler (sig=20, info=0xbf9fd7b0, _ucp=0x0)
at /usr/src/lib/libthr/thread/thr_sig.c:182
#2 0x380434dc in ?? ()
#3 0x00000014 in ?? ()
#4 0xbf9fd7b0 in ?? ()
#5 0x00000000 in ?? ()
(gdb) frame 0
#0 0x0061bd59 in handle_signal (actp=0xbf9fd490, sig=20,
info=0xbf9fd7b0, ucp=0x0) at /usr/src/lib/libthr/thread/thr_sig.c:198
198 SIGSETOR(actp->sa_mask, ucp->uc_sigmask);
(gdb) list
193 int cancel_enable;
194 int in_sigsuspend;
195 int err;
196
197 /* add previous level mask */
198 SIGSETOR(actp->sa_mask, ucp->uc_sigmask);
199
200 /* add this signal's mask */
201 if (!(actp->sa_flags & SA_NODEFER))
202 SIGADDSET(actp->sa_mask, sig);
(gdb) p actp
$1 = (struct sigaction *) 0xbf9fd490
(gdb) p *actp
$2 = {__sigaction_u = {__sa_handler = 0x288310
<qt_sa_sigchld_handler(int)>, __sa_sigaction = 0x288310
<qt_sa_sigchld_handler(int)>}, sa_flags = 8, sa_mask = {__bits = {0,
0, 0, 0}}}
(gdb) p *ucp
Cannot access memory at address 0x0
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