Re: FreeBSD FPE issue on ERTS_FP_CHECK_INIT Re: ERTS_FP_CHECK_INIT error of HiPE in 18.0-rc1 running on FreeBSD 10.1-STABLE

Thanks Mikael for the confirmation.

So can I conclude this as a bug or FPE handling
difference between gcc and clang?
(I noticed on my OS X the *gcc-compiled* 18.0-rc1
didn't cause the problem either.)

Regards,
Kenji Rikitake

On Sat, May 2, 2015 at 3:04 AM, Mikael Pettersson <[email protected]>
wrote:

> Kenji Rikitake writes:
>  > Mikael:
>  >
>  > I managed to reduce the problem to a one-liner.
>  > Executing
>  > trunc(0.8 * (1 bsl 128))
>  > will generate the SIGFPE.
>
> I can reproduce the SIGFPE on Linux/x86_64 by compiling OTP-18-rc1 with
> clang-3.6.0.
>
>
>  >
>  > I attached the gdb of FreeBSD 10.1-STABLE to the Erlang beam.smp and
> generated
>  > the following output.
>  > Regards,
>  > Kenji Rikitake
>  >
>  > --- Erlang shell output:
>  >
>  > Erlang/OTP 18 [RELEASE CANDIDATE 1] [erts-7.0] [source-71bfef4]
> [64-bit] [smp:4:4] [async-threads:10] [kernel-poll:false] [dtrace]
>  >
>  > Eshell V7.0  (abort with ^G)
>  > 1> trunc(0.8 * (1 bsl 128)).
>  > %%% here FPE is issued and the gdb shows the value...
>  > fpe_sig_action: FPE at 0x4ca1b7
>  > 272225893536750785882272431128279252992
>  > 2> trunc(0.8 * (1 bsl 128)).
>  > ERTS_FP_CHECK_INIT at 0x571e60: detected unhandled FPE at
> 0x4cafpe_sig_action: FPE at 0x4ca1b7
>  > 272225893536750785882272431128279252992
>  > 3> q()
>  > ok
>  >
>  > --- output of attached gdb:
>  >
>  > Continuing.
>  >
>  > Program received signal SIGFPE, Arithmetic exception.
>  > [Switching to Thread 80240a000 (LWP 101243/beam.smp)]
>  > double_to_integer (p=0x8031c0398, x=1.4757395258967642e+19) at
> beam/erl_bif_guard.c:302
>  > 302             d = x;            /* trunc */
>  > Current language:  auto; currently minimal
>  > (gdb) print $mxcsr
>  > $1 = 6401
>  > (gdb) disassemble double_to_integer
>  > Dump of assembler code for function double_to_integer:
>  > [...]
>  > 0x00000000004ca1b7 <double_to_integer+519>:     cvttsd2siq %xmm1,%rcx
>  > [...]
>  > End of assembler dump.
>  > (gdb) print $mxcsr
>  > $3 = 6401
>  > (gdb) print $xmm1
>  > $4 = {f = {-1.58818684e-23, 467.199982, 0, 0}}
>  > (gdb) print $rcx
>  > $5 = -9223372036854775808
>  >
>  > [End of log]
>  >
>  > ++> Kenji Rikitake <[email protected]> [2015-04-27 21:53:44 +0900]:
>  > > Date: Mon, 27 Apr 2015 21:53:44 +0900
>  > > From: Kenji Rikitake <[email protected]>
>  > > To: Mikael Pettersson <[email protected]>
>  > > Cc: [email protected]
>  > > Subject: Re: [erlang-bugs] FreeBSD FPE issue on ERTS_FP_CHECK_INIT Re:
>  > >  ERTS_FP_CHECK_INIT error of HiPE in 18.0-rc1 running on FreeBSD
>  > >  10.1-STABLE
>  > >
>  > > FYI:
>  > > A reference on a similar issue on OS X:
>  > > http://erlang.org/pipermail/erlang-bugs/2011-May/002383.html
>  > >
>  > > The instruction caused the exception was "cvttsd2siq".
>  > >
>  > > Kenji Rikitake
>  > >
>  > > ++> Kenji Rikitake <[email protected]> [2015-04-27 21:16:14 +0900]:
>  > > > > Can you provide a disassembly of erts_gc_trunc_1 from this build?
>  > > >
>  > > > > Can you provide a disassembly of gc_double_to_integer from this
> build?
>  > > >
>  > > > I will send you personally (not on the list).
>  > > _______________________________________________
>  > > erlang-bugs mailing list
>  > > [email protected]
>  > > http://erlang.org/mailman/listinfo/erlang-bugs
>
> --
>

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