Date: Sun, 13 Mar 2016 19:03:53 -0500 From: Larry Rosenman <ler@lerctr.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: Freebsd current <freebsd-current@freebsd.org> Subject: Re: Crashes in libthr? Message-ID: <b3caf0652b0cbcb2edb7ebac0c3ded97@thebighonker.lerctr.org> In-Reply-To: <20160313192900.GK1741@kib.kiev.ua> References: <70c63304fceddc1a91e16d63152ff33a@thebighonker.lerctr.org> <20160313181234.GI1741@kib.kiev.ua> <276f6b11da9a005256d24fa5b37d7d5f@thebighonker.lerctr.org> <20160313185852.GJ1741@kib.kiev.ua> <ddea502af186ce26273fddc9360e45cf@thebighonker.lerctr.org> <20160313192900.GK1741@kib.kiev.ua>
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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@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. -- Larry Rosenman http://www.lerctr.org/~ler Phone: +1 214-642-9640 E-Mail: ler@lerctr.org US Mail: 7011 W Parmer Ln, Apt 1115, Austin, TX 78729-6961
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