Re: Crashes in x86_64 math functions

[Arkadiusz MiÅkiewicz <arekm at maven dot pl>]

On Monday 02 of January 2012, Allan McRae wrote:
> I am seeing some crashes in subversion and apache from various math
> functions in glibc-2.15 on x86_64 with backtraces like:
> 
> 
> #0 0x0000000000005446 in ?? ()
> #1 0x00007fffebddb095 in floor () from /lib/libm.so.6
> #2 0x00007ffff7de805c in _dl_relocate_object () from
> /lib/ld-linux-x86-64.so.2
> #3 0x00007ffff7dee526 in dl_open_worker () from /lib/ld-linux-x86-64.so.2
> #4 0x00007ffff7dea286 in _dl_catch_error () from /lib/ld-linux-x86-64.so.2
> #5 0x00007ffff7dede6a in _dl_open () from /lib/ld-linux-x86-64.so.2
> #6 0x00007ffff66fef26 in ?? () from /lib/libdl.so.2
> #7 0x00007ffff7dea286 in _dl_catch_error () from /lib/ld-linux-x86-64.so.2
> #8 0x00007ffff66ff4cf in ?? () from /lib/libdl.so.2
> #9 0x00007ffff66fefc1 in dlopen () from /lib/libdl.so.2
> #10 0x00007ffff7742e5b in apr_dso_load () from /usr/lib/libapr-1.so.0
> ...
> 
> I bisected the issues to commits:
> 
> Use rounds{s,d} for x86 rint, ceil, floor
> http://sourceware.org/git/?p=glibc.git;a=commit;h=ad0f5cad
> (crashes in floor/ceil)
> 
> Optimize accurate 64-bit routines for FMA4 on x86-64
> http://sourceware.org/git/?p=glibc.git;a=commit;h=af968f62
> (crash in sin/tan)
> 
> 
> Not all x86_64 machines are affected so I figured it was probably
> multiarch stuff and this seems confirmed by the issues being "fixed" by
> deleting the relevant files in sysdeps/x86_64/fpu/multiarch.
> 
> This is using glibc-2.15 built with gcc-4.6.2 (20111223), binutils
> 2.22.0 (20111227) and linux-3.1.5.
> 
> Is anyone else seeing similar issues?

I'm seeing same crases and archlinux patch helps for these.

Was there anything new found by debugging in meantime?


gcc-4.6.2-5.x86_64
binutils-2.22.51.0.1-1.x86_64

> Allan

-- 
Arkadiusz MiÅkiewicz        PLD/Linux Team
arekm / maven.pl            http://ftp.pld-linux.org/