[erlang-bugs] Floating point exception (core dumped) in beam
Wed Dec 12 17:19:54 CET 2007
Maximillian Dornseif writes:
> Mikael Pettersson-3 wrote:
> > Can you disassemble pthread_testcancel() up to and including the
> > instruction
> > at 0x281a731b?
> That was more than I thought. The full Output is available at
> http://static.23.nu/md/Pictures/diss-beam.txt , below is a clipped version.
> 0x281a7312 <pthread_testcancel+2534>: mov %esi,%esi
> 0x281a7314 <pthread_testcancel+2536>: mov $0x17e,%eax
> 0x281a7319 <pthread_testcancel+2541>: int $0x80
> 0x281a731b <pthread_testcancel+2543>: jb 0x281a7300
> 0x281a731d <pthread_testcancel+2545>: ret
The kernel reports SIGFPE on return from syscall 0x17e.
This looks like a kernel or libc bug.
Possibly the kernel expects FP exceptions to be masked
and cannot handle user-space (BEAM) having enabled them.
You can test that theory by editing erts/configure: find
fpe-test.c in erts/configure, place a "return 1;" at the
start of main(), run ./configure, ensure that it says that
floating-point exceptions are unreliable, make the system,
and run the test case again. If things now work then this
system needs to be blacklisted (due to apparent kernel/libc
bugs) from using FP exceptions.
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