Date: Mon, 10 Dec 2012 22:33:31 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Mark Atkinson <atkin901@gmail.com> Cc: freebsd-current@freebsd.org, kde-freebsd@spider.kde.org Subject: Re: problems with threads/destructors in -current with llvm/clang Message-ID: <20121210203331.GV3013@kib.kiev.ua> In-Reply-To: <ka5gmu$129$1@ger.gmane.org> References: <k9qjml$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>
next in thread | previous in thread | raw e-mail | index | archive | help
--V7svHyRZ5yxp1ETC Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Dec 10, 2012 at 12:29:20PM -0800, Mark Atkinson wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 >=20 > On 12/10/2012 10:25, Konstantin Belousov wrote: > > On Mon, Dec 10, 2012 at 09:35:29AM -0800, Mark Atkinson wrote: On > > 12/07/2012 09:29, Dimitry Andric wrote: > >>>> On 2012-12-07 17:43, Mark Atkinson wrote: > >>>>> On 12/7/2012 6:08 AM, Dimitry Andric wrote: > >>>> ... > >>>>>> With this patch (placed in > >>>>>> /usr/ports/devel/dbus-qt4/files), qdbus starts up and > >>>>>> exits normally for me. I did not do any other rigorous > >>>>>> testing, though. :) > >>>>>=20 > >>>>> Thanks for the awesome analysis. I will endeavor to figure > >>>>> out the bug in automoc4 that keeps it segfaulting randomly > >>>>> during compilation. > >>>>>=20 > >>>>> Weirdly it segfaults reliably under portmaster, but may > >>>>> work just fine under just make. > >>>>=20 > >>>> Try running it under valgrind. If it does undefined things, > >>>> it may work or not work randomly, and valgrind usually > >>>> catches this. > >=20 > > OK, so this one's a bit of a headscratcher, but maybe someone has > > some ideas. automoc4 always dies in libthr. > >> Build rtld, libc and libthr with the debug symbols to get useful=20 > >> backtrace. > >=20 > >=20 > > #0 0x2864b1da in swapcontext () from /lib/libthr.so.3 [New Thread > > 29003800 (LWP 100960/automoc4.bin)] [New Thread 29003080 (LWP > > 101795/automoc4.bin)] (gdb) bt #0 0x2864b1da in swapcontext () > > from /lib/libthr.so.3 #1 0x2864a046 in pthread_getspecific () from > > /lib/libthr.so.3 #2 0x28649e9a in pthread_getspecific () from > > /lib/libthr.so.3 #3 0x2864dbfb in pthread_kill () from > > /lib/libthr.so.3 #4 0x28064e71 in _rtld_get_stack_prot () from > > /libexec/ld-elf.so.1 #5 0x2865d500 in _thread_state_running () > > from /lib/libthr.so.3 #6 0x2865d500 in _thread_state_running () > > from /lib/libthr.so.3 #7 0x28075e00 in ?? () #8 0x286b4d30 in > > pipe () from /lib/libc.so.7 #9 0x280712ac in ?? () from > > /libexec/ld-elf.so.1 #10 0xbf9fce2c in ?? () #11 0x2805e505 in > > r_debug_state () from /libexec/ld-elf.so.1 #12 0x28071f68 in ?? () > > from /libexec/ld-elf.so.1 #13 0xbf9fcde0 in ?? () #14 0xbf9fce18 in > > ?? () #15 0x00000001 in ?? () #16 0x00000000 in ?? () (gdb) thread > > 2 [Switching to thread 2 (Thread 29003080 (LWP > > 101795/automoc4.bin))]#0 0x2876c3a7 in select () from > > /lib/libc.so.7 (gdb) bt #0 0x2876c3a7 in select () from > > /lib/libc.so.7 #1 0x286481ab in select () from /lib/libthr.so.3 #2 > > 0x28365c49 in qt_safe_select (nfds=3D17, fdread=3D0xbfbfa090,=20 > > fdwrite=3D0xbfbfa010, fdexcept=3D0x0, orig_timeout=3D0x0) at=20 > > kernel/qcore_unix.cpp:83 #3 0x282c23b2 in select_msecs (nfds=3D17, > > fdread=3D0xbfbfa090, fdwrite=3D0xbfbfa010, timeout=3D-1) at > > io/qprocess_unix.cpp:998 #4 0x282c33f3 in > > QProcessPrivate::waitForFinished (this=3D0x29089300, msecs=3D-1) at > > io/qprocess_unix.cpp:1219 #5 0x28240b50 in > > QProcess::waitForFinished (this=3D0xbfbfa1e8, msecs=3D-1) at > > io/qprocess.cpp:1759 #6 0x0805487b in AutoMoc::echoColor > > (this=3D0xbfbfab00, msg=3D@0xbfbfa2e0) at=20 > > /usr/ports/devel/automoc4/work/automoc4-0.9.88/kde4automoc.cpp:74=20 > > #7 0x08052650 in AutoMoc::generateMoc (this=3D0xbfbfab00,=20 > > sourceFile=3D@0x29011658, mocFileName=3D@0x2901165c) at=20 > > /usr/ports/devel/automoc4/work/automoc4-0.9.88/kde4automoc.cpp:569=20 > > #8 0x0804f13b in AutoMoc::run (this=3D0xbfbfab00) at=20 > > /usr/ports/devel/automoc4/work/automoc4-0.9.88/kde4automoc.cpp:470=20 > > #9 0x0804aaef in main (argc=3D6, argv=3D0xbfbfab98) at=20 > > /usr/ports/devel/automoc4/work/automoc4-0.9.88/kde4automoc.cpp:114 > >=20 > > I noticed that qt_safe_select() used a register bound variable for > > the return value, but removing that didn't alleviate the error. > >=20 > > The pthread_getspecific() manpage mentions that if the key is > > deleted then the behavior is undefined -- so maybe this? It's > > definitely seems like a race condition of some kind. > >=20 > > Valgrind will kill any run of automoc4 and doesn't like some=20 > > instruction after the qt_safe_select() call: > >=20 > > vex x86->IR: unhandled instruction bytes: 0xF 0xB 0x90 0x90 > >> This is ud2, an instruction which generates a fault on purpose. > >=20 > >> So rebuild the system libraries with the debug symbols and show=20 > >> the backtrace. >=20 > 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=3D-g clean all install This is really FAQ. >=20 > #0 0xbf9fd01a in ?? () > [New Thread 29003800 (LWP 100652/automoc4.bin)] > [New Thread 29003080 (LWP 101395/automoc4.bin)] > (gdb) bt > #0 0xbf9fd01a in ?? () > #1 0xbf9fcd20 in ?? () > #2 0x00000000 in ?? () > (gdb) info thread > 2 Thread 29003080 (LWP 101395/automoc4.bin) select () at select.S:3 > * 1 Thread 29003800 (LWP 100652/automoc4.bin) 0xbf9fd01a in ?? () > Current language: auto; currently asm > (gdb) thread 2 > [Switching to thread 2 (Thread 29003080 (LWP 101395/automoc4.bin))]#0 > select () at select.S:3 > 3 RSYSCALL(select) > (gdb) bt > #0 select () at select.S:3 > #1 0x28659028 in __select (numfds=3D17, readfds=3D0xbfbfc1f0, > writefds=3D0xbfbfc170, exceptfds=3D0x0, timeout=3D0x0) at > /usr/src/lib/libthr/thread/thr_syscalls.c:539 > #2 0x28372c49 in qt_safe_select (nfds=3D17, fdread=3D0xbfbfc1f0, > fdwrite=3D0xbfbfc170, fdexcept=3D0x0, orig_timeout=3D0x0) at > kernel/qcore_unix.cpp:83 > #3 0x282cf3b2 in select_msecs (nfds=3D17, fdread=3D0xbfbfc1f0, > fdwrite=3D0xbfbfc170, timeout=3D-1) at io/qprocess_unix.cpp:998 > #4 0x282d03f3 in QProcessPrivate::waitForFinished (this=3D0x29089300, > msecs=3D-1) at io/qprocess_unix.cpp:1219 > #5 0x2824db50 in QProcess::waitForFinished (this=3D0xbfbfc348, > msecs=3D-1) at io/qprocess.cpp:1759 > #6 0x0805487b in AutoMoc::echoColor (this=3D0xbfbfcc60, > msg=3D@0xbfbfc440) at > /usr/ports/devel/automoc4/work/automoc4-0.9.88/kde4automoc.cpp:74 > #7 0x08052650 in AutoMoc::generateMoc (this=3D0xbfbfcc60, > sourceFile=3D@0x29011638, mocFileName=3D@0x2901163c) at > /usr/ports/devel/automoc4/work/automoc4-0.9.88/kde4automoc.cpp:569 > #8 0x0804f13b in AutoMoc::run (this=3D0xbfbfcc60) at > /usr/ports/devel/automoc4/work/automoc4-0.9.88/kde4automoc.cpp:470 > #9 0x0804aaef in main (argc=3D6, argv=3D0xbfbfccfc) at > /usr/ports/devel/automoc4/work/automoc4-0.9.88/kde4automoc.cpp:114 > (gdb) thread 1 > [Switching to thread 1 (Thread 29003800 (LWP 100652/automoc4.bin))]#0 > 0xbf9fd01a in ?? () > (gdb) bt > #0 0xbf9fd01a in ?? () > #1 0xbf9fcd20 in ?? () > #2 0x00000000 in ?? () > (gdb) frame 0 > #0 0xbf9fd01a in ?? () > (gdb) info reg > eax 0x0 0 > ecx 0x286d7ddb 678264283 > edx 0x0 0 > ebx 0xbf9fd058 -1080045480 > esp 0xbf9fcd1c 0xbf9fcd1c > ebp 0x14 0x14 > esi 0x2865c563 677758307 > edi 0x2869f2ec 678032108 > eip 0xbf9fd01a 0xbf9fd01a > eflags 0x210246 2163270 > cs 0x33 51 > ss 0x3b 59 > ds 0x3b 59 > es 0x3b 59 > fs 0x3b 59 > gs 0x1b 27 >=20 >=20 > > =3D=3D33074=3D=3D valgrind: Unrecognised instruction at address > > 0x380434e9. =3D=3D33074=3D=3D at 0x380434E9: ??? (in=20 > > /usr/local/lib/valgrind/memcheck-x86-freebsd) =3D=3D33074=3D=3D by > > 0x323C48: qt_safe_select(int, fd_set*, fd_set*, fd_set*, timeval > > const*) (qcore_unix.cpp:83) =3D=3D33074=3D=3D by 0x2803B1: > > select_msecs(int, fd_set*, fd_set*, int) (qprocess_unix.cpp:998)=20 > > =3D=3D33074=3D=3D by 0x28021D: QProcessPrivate::waitForStarted(int)= =20 > > (qprocess_unix.cpp:1031) =3D=3D33074=3D=3D by 0x1FFA02: > > QProcess::waitForStarted(int) (qprocess.cpp:1687) =3D=3D33074=3D=3D = by > > 0x1FEAEA: QProcess::waitForFinished(int) (qprocess.cpp:1752)=20 > > =3D=3D33074=3D=3D by 0x805487A: AutoMoc::echoColor(QString const&)= =20 > > (kde4automoc.cpp:74) =3D=3D33074=3D=3D by 0x805264F: > > AutoMoc::generateMoc(QString const&, QString const&) > > (kde4automoc.cpp:569) =3D=3D33074=3D=3D by 0x804F13A: AutoMoc::run() > > (kde4automoc.cpp:470) =3D=3D33074=3D=3D by 0x804AAEE: main > > (kde4automoc.cpp:114) > >=20 > > Full valgrind output is at http://pastebin.com/KQTKYGX5 > >=20 > >>=20 > >> _______________________________________________=20 > >> freebsd-current@freebsd.org mailing list=20 > >> http://lists.freebsd.org/mailman/listinfo/freebsd-current To > >> unsubscribe, send any mail to > >> "freebsd-current-unsubscribe@freebsd.org" >=20 > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v2.0.19 (FreeBSD) > Comment: Using GnuPG with undefined - http://www.enigmail.net/ >=20 > iEYEARECAAYFAlDGRiAACgkQrDN5kXnx8yYJFQCgkMYOxkIfFibTaPNOkikw+0Ki > t3YAoJTCIYecBmk7LT1ehsdQzwhm1Uif > =3D4Ars > -----END PGP SIGNATURE----- >=20 > _______________________________________________ > 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" --V7svHyRZ5yxp1ETC Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iQIcBAEBAgAGBQJQxkcaAAoJEJDCuSvBvK1BBIEQAKJ7/AcTVwKvufr3co5PTW7y NvfsTyvJoOLEcHvme2gi4WX+cC/wZPpnRvCZ/of3hZG6VxImi2ABdlzbmcmnhaLA 7ws/mu8onQyXLtZF8r1r2I/SLAWyxtPXjyXZTwDcIyFFCAaKYXRJ4D/N+7lXHwqC 5RfSkTyIeRRqJZ+7L2M2DBqPkk8MXtsXKhkXHj2GzY8aM1KbQSRQ50axLXNIkr/R DVptmdR0hWiTJRbpyZKosi3ikCMjLjf5aU2s/ry36VEI5fT0so25JV7smE7rKm33 1AJHQSy+uz56zEpzIURGEvEUsYvVkb/TleGV7QXzdrw5pxPnkx3W/IwssErqzWjC KP4zG/5A7cAaroshX3ICf5Ya3Dad6EQe+jxoHGiGEV2UBzyEwzbnj4E3oL65TfCA ycXB3WRv7W3D9xfjZrMiIXGXwvTDL6Qbo2Atspjw12ScMCxlRjucbGoYQvjGmiPM wix5zBbY1NPFvr+BLC2c9dTI0+0Oe/XcDC3QT5lWTD9zsMZ7htloZmJlouwwWgFS yw7aRVKNyhxGQpiry6MLKnW/DZih9tUD84tBMq3ymEFsE7DIineHVPyQnUS6pf2R 3CxRla+iMOUlauhT4sc3TINTYAJaAVlYsJzX7UE1a+5aKTqZQx0EEiHLfWnYcdJU LzWCwMMhE5ZciQRbVQ49 =ZNYA -----END PGP SIGNATURE----- --V7svHyRZ5yxp1ETC--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20121210203331.GV3013>