I recompiled perl with -Doptimize=-g, but I intentionally did not carry forward my hacks to stub sigaction() calls. With ig's $SIG{__WARN__} function I still get a trace that does not include the root cause. 
Thread 2 (Thread 18154):
#0  0x00007f96d1155d57 in kill () from /lib/libc.so.6
#1  0x000000000046a9bb in Perl_my_unexec (my_perl=0x3229c40) at perl.c
+:3552
#2  0x00000000004cb36f in Perl_pp_goto (my_perl=0x3229c40) at pp_ctl.c
+:2522
#3  0x0000000000445bb0 in Perl_runops_debug (my_perl=0x3229c40) at dum
+p.c:1639
#4  0x00000000004680ed in S_call_body (my_perl=0x3229c40, myop=0x7f96c
+daa6a20, is_eval=0 '\000') at perl.c:2804
#5  0x0000000000467ae2 in Perl_call_sv (my_perl=0x3229c40, sv=0x336dd3
+0, flags=2) at perl.c:2708
#6  0x00000000004493e5 in S_vdie_common (my_perl=0x3229c40, 
    message=0x3dbdd70 "Thread 1 terminated abnormally: main=HASH(0x3ec
+fb90) at /p4/smframework/app/unit_tests/test_fmwk/tests/mnc-ha/Cluste
+rSuite.pm line 115.\n", msglen=136, utf8=0, 
    warn=1 '\001') at util.c:1283
#7  0x0000000000449f14 in Perl_vwarn (my_perl=0x3229c40, pat=0x7f96d09
+095a8 "Thread %lu terminated abnormally: %_", args=0x7f96cdaa6c10) at
+ util.c:1447
#8  0x000000000044a0e5 in Perl_warn (my_perl=0x3229c40, pat=0x7f96d090
+95a8 "Thread %lu terminated abnormally: %_") at util.c:1480
#9  0x00007f96d0901ecb in S_ithread_run (arg=0x32289b0) at threads.xs:
+480
#10 0x00007f96d14ab9ca in start_thread () from /lib/libpthread.so.0
#11 0x00007f96d12086fd in clone () from /lib/libc.so.6
#12 0x0000000000000000 in ?? ()

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I think perhaps my hacks to sigaction() were useful and/or there must be other options. As this is not indicating XSUBs code, I'll try 'perl -d' first.

In reply to Re^4: stack trace from thread exit by falan95054
in thread stack trace from thread exit by falan95054

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