Re: Crashes in libthr?

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_at_)
>> 
>> 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......


-- 
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 214-642-9640                 E-Mail: ler_at_lerctr.org
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