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make check failed at random timing with Segfaults or BUS error

Submitted by Hideaki Suzuki

Link to original bug (#793353)

Description

On armhf, make check in orc fails at random timing. (occasionally pass all tests)

[Environment]

  • HW: Raspberry Pi3
  • OS: Linux raspberrypi 4.9.79-v7+ #1091 SMP Tue Feb 6 13:18:45 GMT 2018 armv7l GNU/Linux (Raspbian Stretch)
  • Compiler: Both gcc6.3.0(default) and gcc4.9.3-14 are tried; the results were same.
  • Builder: meson and autoconf are tried; the results were same.
  • Code Tag: orc-0.4.26 to orc-0.4.28 are tried; the results were same.

I have located the code of segfaults/bus error while running benchmorc.

The errors always happen at the following code point. However, what test item fails depends on individual executions and looks like at random.

orcexecutor.c:

void
orc_executor_run (OrcExecutor *ex)
{
void (*func) (OrcExecutor *);

if (ex->program) {
func = ex->program->code_exec;
} else {
OrcCode *code = (OrcCode )ex->arrays[ORC_VAR_A2];
func = code->exec;
}
if (func) {
func (ex); ****** <--- BAD THINGS WILL HAPPEN HERE *****
/ ORC_ERROR("counters %d %d %d", ex->counter1, ex->counter2, ex->counter3); */
} else {
orc_executor_emulate (ex);
}
}

Due to the failure mode, does the generated code have memory alignment issues?

I didn't observe the same issue on Raspbian Jessie. So, the kernel and glibc behaviors might be related IMHO.