prof_pcs|common.nativeexec_bindnow_opt failed on CDash.

Test above failed on CDash. Never seen before: http://dynamorio.org/CDash/testDetails.php?test=670677&build=43054

Test output
Not running under DR
calling via IAT-style call
nativeexec.dll:import_me1(57) under DR
calling via PLT-style call
nativeexec.dll:import_me2(37) under DR
calling via funky ind call
nativeexec.dll:import_me3(17) under DR
calling nested native
nativeexec.exe:print_int(42) not under DR
calling cross-module unwinder
before longjmp, 1
<Application /work/dr/nightly/run/build_debug-internal-64/suite/tests/bin/common.nativeexec (22045).  Internal Error: DynamoRIO debug check failure: /work/dr/nightly/src/core/unix/signal.c:4971 tr == NULL || tr->under_dynamo_control || IS_CLIENT_THREAD(dcontext) || sig == SUSPEND_SIGNAL
(Error occurred @382 frags)
version 7.90.18025, custom build
-no_dynamic_options -no_kstats -prof_pcs -code_api -stderr_mask 12 -stack_size 56K -signal_stack_size 32K -disable_traces -no_enable_traces -max_elide_jmp 0 -max_elide_call 0 -no_shared_traces -bb_ibl_targets -no_shared_trace_ibl_routine -no_inline_ignored_syscalls -native_exec_default_list '' -native_exec_list 'common.n
0x00007fb9a82776c0 0x00000000710d06b9
0x00007fb9a8277910 0x00000000712c17de
0x00007fb9a8277ab0 0x0000000071282339
0x0000000000400a89 0x6873756c66660036>