https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203333
Bug ID: 203333
Summary: libexecinfo from base has trouble walking a simple
stack
Product: Base System
Version: 10.1-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: freebsd-bugs@FreeBSD.org
Reporter: sa...@saper.info
security/tor-devel ports has a simple test case in C to check for correctness
of the backtrace() reporting:
https://gitweb.torproject.org/tor.git/tree/src/test/test_bt.sh
https://gitweb.torproject.org/tor.git/tree/src/test/test_bt_cl.c
https://gitweb.torproject.org/tor.git/tree/src/test/bt_test.py
One needs https://trac.torproject.org/projects/tor/ticket/17151 applied to make
sure tor's configure considers using external -lexecinfo
When linking the test code against libexecinfo from base (using 10.1 amd64
r283908) a truncated result appears, because there is an unused reserved space
on the stack:
$ ./src/test/test-bt-cl crash
============================================================ T= 1443178736
Tor died: Caught signal 11
0x102c92d <clean_up_backtrace_handler+0x8d> at
/home/saper/sw/tor/src/test/test-bt-cl
0x8016a8997 <pthread_sigmask+0x497> at /lib/libthr.so.3
0x102c205 <crash+0x25> at /home/saper/sw/tor/src/test/test-bt-cl
instead of
> env LD_LIBRARY_PATH=/usr/local/lib ./src/test/test-bt-cl crash
============================================================ T= 1443178868
Tor died: Caught signal 11
0x8016a8997 <pthread_sigmask+1175> at /lib/libthr.so.3
0x8016a81a8 <pthread_getspecific+3544> at /lib/libthr.so.3
0x102c205 <crash+37> at /home/saper/sw/tor/src/test/test-bt-cl
0x102c27f <oh_what+31> at /home/saper/sw/tor/src/test/test-bt-cl
0x102c2cf <a_tangled_web+31> at /home/saper/sw/tor/src/test/test-bt-cl
0x102c31f <we_weave+31> at /home/saper/sw/tor/src/test/test-bt-cl
0x102c462 <main+274> at /home/saper/sw/tor/src/test/test-bt-cl
0x102c0f1 <_start+417> at /home/saper/sw/tor/src/test/test-bt-cl
when using libexecinfo from ports.
Is it possible to update libexecinfo in base to fix this problem?
See also
* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200778
* https://trac.torproject.org/projects/tor/ticket/17151
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