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Re: [patch 4/4 v2] unwinder: The unwinder (x86* only)

On Thu, 2013-06-13 at 15:48 +0200, Mark Wielaard wrote:
> > >   That is for the testcase. But I might have misunderstood. I never
> > >   could make the selfdump tests work since it tries to find the
> > >   "jmp" symbol (which seems to never be used?).
> > 
> > make check will not PASS for  It PASSes for me.
> > 
> > $ nm tests/backtrace-child|grep -w jmp
> > 0000000000000acb t jmp
> > 
> > Tested on Fedora 18 x86_64 and wit mjw/unwind now also on CentOS 6.3 x86_64.
> That is indeed strange, those are similar to the platforms (f18 and
> rhel6.4 x86_64) that I also tested on. I assume I had something weird in
> my tree. I'll try again with clean trees. But I don't fully understand
> why/where jmp is actually used in the test case.

OK, on f18 x86_64 it does pass with a cleanly build tree. So I must have
messed something up earlier, sorry.

But on rhel6.4 it does fail because nm tests/backtrace-child|grep -w jmp
is empty, and so you get:

FAIL: (exit: 1)

backtrace: /home/mark/src/elfutils/tests/backtrace.c:439: selfdump: Assertion `symi < nsym' failed.
/home/mark/src/elfutils/tests/ line 84: 17144 Aborted                 (core dumped) LD_LIBRARY_PATH="${built_library_path}${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH" $VALGRIND_CMD "$@"

I seem to need to build with CFLAGS="-g -O0" to keep the jmp function around. Then backtrace-child seems to succeed, but backtrace-child-biarch fails with:

FAIL: (exit: 1)

0x219000	0x21c000	/home/mark/build/elfutils-obj/tests/backtrace-child-biarch
0x21c000	0x3b0000	/lib/
0xbfd000	0xc16000	/lib/
0xf0b000	0xf0c000	[vdso: 28062]
0xf89000	0xfa9000	/lib/
TID 28063:
# 0 0xf0b430    	(null)
TID 28062:
# 0 0xf0b430    	(null)
No DWARF information found
No DWARF information found
backtrace: /home/mark/src/elfutils/tests/backtrace.c:249: selfdump_callback: Assertion `seen_main' failed.
/home/mark/src/elfutils/tests/ line 84: 28061 Aborted                 (core dumped) LD_LIBRARY_PATH="${built_library_path}${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH" $VALGRIND_CMD "$@"
backtrace-child-biarch: no main

How odd. I'll try and see what is really going on here.



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