Crashes in libthr?
Larry Rosenman
ler at lerctr.org
Mon Mar 14 02:54:01 UTC 2016
On Sun, Mar 13, 2016 at 09:51:23PM -0500, Larry Rosenman wrote:
> On Sun, Mar 13, 2016 at 07:03:53PM -0500, Larry Rosenman wrote:
> > On 2016-03-13 14:29, Konstantin Belousov wrote:
> > > On Sun, Mar 13, 2016 at 02:10:58PM -0500, Larry Rosenman wrote:
> > >> On 2016-03-13 13:58, Konstantin Belousov wrote:
> > >> > On Sun, Mar 13, 2016 at 01:32:20PM -0500, Larry Rosenman wrote:
> > >> >> On 2016-03-13 13:12, Konstantin Belousov wrote:
> > >> >> > On Sun, Mar 13, 2016 at 11:16:20AM -0500, Larry Rosenman wrote:
> > >> >> >> I updated one of my servers, and WHILE DOING THE INSTALLWORLD, I get
> > >> >> >> segfaults.
> > >> >> >>
> > >> >> >> ANY multithreaded program crashes.
> > >> >> >>
> > >> >> >> I reverted libthr, and it's fine.
> > >> >> >>
> > >> >> >> borg.lerctr.org / # gdb -c zfs.core /sbin/zfs
> > >> >> >> GNU gdb 6.1.1 [FreeBSD]
> > >> >> >> Copyright 2004 Free Software Foundation, Inc.
> > >> >> >> GDB is free software, covered by the GNU General Public License, and
> > >> >> >> you
> > >> >> >> are
> > >> >> >> welcome to change it and/or distribute copies of it under certain
> > >> >> >> conditions.
> > >> >> >> Type "show copying" to see the conditions.
> > >> >> >> There is absolutely no warranty for GDB. Type "show warranty" for
> > >> >> >> details.
> > >> >> >> This GDB was configured as "amd64-marcel-freebsd"...
> > >> >> >> Core was generated by `zfs'.
> > >> >> >> Program terminated with signal 11, Segmentation fault.
> > >> >> >> Reading symbols from /lib/libjail.so.1...Reading symbols from
> > >> >> >> /usr/lib/debug//lib/libjail.so.1.debug...done.
> > >> >> >> done.
> > >> >> >> Loaded symbols for /lib/libjail.so.1
> > >> >> >> Reading symbols from /lib/libnvpair.so.2...Reading symbols from
> > >> >> >> /usr/lib/debug//lib/libnvpair.so.2.debug...done.
> > >> >> >> done.
> > >> >> >> Loaded symbols for /lib/libnvpair.so.2
> > >> >> >> Reading symbols from /lib/libuutil.so.2...Reading symbols from
> > >> >> >> /usr/lib/debug//lib/libuutil.so.2.debug...done.
> > >> >> >> done.
> > >> >> >> Loaded symbols for /lib/libuutil.so.2
> > >> >> >> Reading symbols from /lib/libzfs_core.so.2...Reading symbols from
> > >> >> >> /usr/lib/debug//lib/libzfs_core.so.2.debug...done.
> > >> >> >> done.
> > >> >> >> Loaded symbols for /lib/libzfs_core.so.2
> > >> >> >> Reading symbols from /lib/libzfs.so.2...Reading symbols from
> > >> >> >> /usr/lib/debug//lib/libzfs.so.2.debug...done.
> > >> >> >> done.
> > >> >> >> Loaded symbols for /lib/libzfs.so.2
> > >> >> >> Reading symbols from /lib/libc.so.7...Reading symbols from
> > >> >> >> /usr/lib/debug//lib/libc.so.7.debug...done.
> > >> >> >> done.
> > >> >> >> Loaded symbols for /lib/libc.so.7
> > >> >> >> Reading symbols from /lib/libmd.so.6...Reading symbols from
> > >> >> >> /usr/lib/debug//lib/libmd.so.6.debug...done.
> > >> >> >> done.
> > >> >> >> Loaded symbols for /lib/libmd.so.6
> > >> >> >> Reading symbols from /lib/libumem.so.2...Reading symbols from
> > >> >> >> /usr/lib/debug//lib/libumem.so.2.debug...done.
> > >> >> >> done.
> > >> >> >> Loaded symbols for /lib/libumem.so.2
> > >> >> >> Reading symbols from /lib/libutil.so.9...Reading symbols from
> > >> >> >> /usr/lib/debug//lib/libutil.so.9.debug...done.
> > >> >> >> done.
> > >> >> >> Loaded symbols for /lib/libutil.so.9
> > >> >> >> Reading symbols from /lib/libm.so.5...Reading symbols from
> > >> >> >> /usr/lib/debug//lib/libm.so.5.debug...done.
> > >> >> >> done.
> > >> >> >> Loaded symbols for /lib/libm.so.5
> > >> >> >> Reading symbols from /lib/libavl.so.2...Reading symbols from
> > >> >> >> /usr/lib/debug//lib/libavl.so.2.debug...done.
> > >> >> >> done.
> > >> >> >> Loaded symbols for /lib/libavl.so.2
> > >> >> >> Reading symbols from /lib/libbsdxml.so.4...Reading symbols from
> > >> >> >> /usr/lib/debug//lib/libbsdxml.so.4.debug...done.
> > >> >> >> done.
> > >> >> >> Loaded symbols for /lib/libbsdxml.so.4
> > >> >> >> Reading symbols from /lib/libgeom.so.5...Reading symbols from
> > >> >> >> /usr/lib/debug//lib/libgeom.so.5.debug...done.
> > >> >> >> done.
> > >> >> >> Loaded symbols for /lib/libgeom.so.5
> > >> >> >> Reading symbols from /lib/libz.so.6...Reading symbols from
> > >> >> >> /usr/lib/debug//lib/libz.so.6.debug...done.
> > >> >> >> done.
> > >> >> >> Loaded symbols for /lib/libz.so.6
> > >> >> >> Reading symbols from /lib/libthr.so.3...done.
> > >> >> >> Loaded symbols for /lib/libthr.so.3
> > >> >> > Why all libs have debug symbols, while your most interesting one,
> > >> >> > libthr.so.3, does not ?
> > >> >> >
> > >> >> >> Reading symbols from /lib/libsbuf.so.6...Reading symbols from
> > >> >> >> /usr/lib/debug//lib/libsbuf.so.6.debug...done.
> > >> >> >> done.
> > >> >> >> Loaded symbols for /lib/libsbuf.so.6
> > >> >> >> Reading symbols from /libexec/ld-elf.so.1...done.
> > >> >> >> Loaded symbols for /libexec/ld-elf.so.1
> > >> >> >> #0 0x0000000802703f81 in __pthread_cxa_finalize () from
> > >> >> >> /lib/libthr.so.3
> > >> >> >> [New LWP 100957]
> > >> >> >> (gdb) bt
> > >> >> >> #0 0x0000000802703f81 in __pthread_cxa_finalize () from
> > >> >> >> /lib/libthr.so.3
> > >> >> >> #1 0x0000000802703e85 in __pthread_cxa_finalize () from
> > >> >> >> /lib/libthr.so.3
> > >> >> >> #2 0x0000000802707052 in ?? () from /lib/libthr.so.3
> > >> >> >> #3 0x000000080063fc00 in ?? ()
> > >> >> >> #4 0x00007fffffffe638 in ?? ()
> > >> >> >> #5 0x00007fffffffe5b0 in ?? ()
> > >> >> >> #6 0x00000008026f8fd6 in atoi at plt () from /lib/libthr.so.3
> > >> >> >> #7 0x00007fffffffe5b0 in ?? ()
> > >> >> >> #8 0x000000080061adfd in r_debug_state () from /libexec/ld-elf.so.1
> > >> >> >> Previous frame inner to this frame (corrupt stack?)
> > >> >> >> (gdb)
> > >> >> >>
> > >> >> >> old SVN: r296103
> > >> >> >> new SVN: r296796M
> > >> >> >> (The M is a nd6 patch from markj@)
> > >> >> >>
> > >> >> >> this was a FULL buildworld/buildkernel.
> > >> >> >
> > >> >> > If you cd lib/libthr and do
> > >> >> > make clean all install DEBUG_FLAGS=-g
> > >> >> > on the broken world, does it fix the problem ? If not, do debugging
> > >> >> > symbols from libthr appear accessible to gdb at least ? Try this to
> > >> >> > get useful backtrace with source lines information.
> > >> >> ar crashes linking the library......
> > >> >
> > >> > ar does not link library, it archives .o into .a archive.
> > >> > That said, neither ar nor ld (I am not sure whether 'ar' or 'linking'
> > >> > is a thinko in the sentence above) do not depend on libthr. You have
> > >> > something more fundamental broken.
> > >> >
> > >> > I put the libthr.so.3 built with the debugging symbols on amd64, using
> > >> > head
> > >> > r296779, at https://people.freebsd.org/~kib/misc/libthr.so.3 . Try
> > >> > with
> > >> > it by manually copying the file to /lib. If still crashing, it should
> > >> > show the line numbers.
> > >> no dice.
> > >>
> > >> (gdb) borg.lerctr.org /home/ler $ sudo gdb -c ar.core /usr/bin/ar
> > >> Password:
> > >> GNU gdb 6.1.1 [FreeBSD]
> > >> Copyright 2004 Free Software Foundation, Inc.
> > >> GDB is free software, covered by the GNU General Public License, and
> > >> you
> > >> are
> > >> welcome to change it and/or distribute copies of it under certain
> > >> conditions.
> > >> Type "show copying" to see the conditions.
> > >> There is absolutely no warranty for GDB. Type "show warranty" for
> > >> details.
> > >> This GDB was configured as "amd64-marcel-freebsd"...
> > >> Core was generated by `ar'.
> > >> Program terminated with signal 11, Segmentation fault.
> > >> #0 0x000000000042c271 in _thr_rtld_init ()
> > >> [New Thread 800a1b000 (LWP 100317/<unknown>)]
> > >> (gdb) bt
> > >> #0 0x000000000042c271 in _thr_rtld_init ()
> > >> #1 0x000000000042c19a in _libpthread_init ()
> > >> #2 0x00000000004eaa82 in __do_global_ctors_aux ()
> > >> #3 0x0000000000400196 in _init ()
> > >> #4 0x00007fffffffebd0 in ?? ()
> > >> #5 0x00000000004002a6 in _start ()
> > >> #6 0x0000000000000000 in ?? ()
> > >> (gdb)
> > >>
> > >
> > > So your ar is linked to libthr, ok. But since the binary is statically
> > > linked, of course putting libthr.so.3 in place would not add symbols
> > > for ar.
> > >
> > > Try to run some dynamically linked binary which uses libthr. E.g. both
> > > ntpq and zfs qualify.
> > zfs works with your libthr.
> >
> > I'm doing a full no -j buildworld and we'll see where we get. I used
> > the ar from a zfs snap to get buildworld to run.
> >
> >
> I wound up restoring EVERYTHING from the latest snapshot memstick image
> and I still can't get a world built:
>
at http://www.lerctr.org/~ler/FreeBSD/make.out
is the make.out, from a clean /usr/obj, and latest /usr/src.
>
>
> --
> Larry Rosenman http://www.lerctr.org/~ler
> Phone: +1 214-642-9640 E-Mail: ler at lerctr.org
> US Mail: 7011 W Parmer Ln, Apt 1115, Austin, TX 78729-6961
--
Larry Rosenman http://www.lerctr.org/~ler
Phone: +1 214-642-9640 E-Mail: ler at lerctr.org
US Mail: 7011 W Parmer Ln, Apt 1115, Austin, TX 78729-6961
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