[Bug gdb/26828] SIGSEGV in follow_die_offset dwarf2/read.c:22950

["simark at simark dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26828

--- Comment #6 from Simon Marchi <simark at simark dot ca> ---
Actually, I made some progress.  The solib-search-path isn't sufficient, I
think GDB opens /lib/libpthread.so.0 on my system.  It would be more
appropriate to use "set sysroot" in this situation.  When setting the sysroot,
to the base of what you provided, then the correct /lib/libpthread.so.0 is
loaded by GDB.

Another note for those trying to reproduce: if you have a --enable-targets=all
GDB, it will (erroneously) detect the core as having the Symbian osabi and then
tell you that it doesn't know how to handle cores.  Use "set osabi GNU/Linux"
to force it to use that osabi.

So now the status is that I do get a crash, but I think it's not the same as
you, I think it's earlier.  I build with --enable-ubsan, and that looks like an
undefined behabior sanitizer message

$ ../gdb -nx --data-directory=../data-directory                                 
(gdb) set osabi GNU/Linux 
(gdb) set sysroot /home/simark/build/binutils-gdb/gdb/repo
(gdb) file Foo
Reading symbols from Foo...
(gdb) core-file Foo-core 
warning: Can't open file /media/mmcblk0p1/install/usr/bin/Foo during
file-backed mapping note processing
warning: Can't open file /lib/libm-2.21.so during file-backed mapping note
processing
warning: Can't open file /lib/libpthread-2.21.so during file-backed mapping
note processing
warning: Can't open file /lib/libgcc_s.so.1 during file-backed mapping note
processing
warning: Can't open file /media/mmcblk0p1/install/usr/lib/libstdc++.so.6 during
file-backed mapping note processing
warning: Can't open file /lib/libc-2.21.so during file-backed mapping note
processing
warning: Can't open file /lib/ld-2.21.so during file-backed mapping note
processing
[New LWP 29367]
[New LWP 29368]
warning: Could not load shared library symbols for 5 libraries, e.g.
/lib/libc.so.6.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?
warning: Unable to find libthread_db matching inferior's thread library, thread
debugging will not be available.
warning: Unable to find libthread_db matching inferior's thread library, thread
debugging will not be available.
Core was generated by `./Foo'.
Program terminated with signal SIGABRT, Aborted.
#0  0xb6c3809c in pthread_cond_wait () from
/home/simark/build/binutils-gdb/gdb/repo/lib/libpthread.so.0
[Current thread is 1 (LWP 29367)]
(gdb) bt
/home/simark/src/binutils-gdb/gdb/arm-tdep.c:1551:30: runtime error: shift
exponent 32 is too large for 32-bit type 'unsigned int'

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