[erlang-bugs] beam segfault

[Ruan Jonker]

Hi All,

I've recently encountered the following in dmesg output after one of my
VM's crashed:

>>> dmesg output start
[2827116.693283] beam[28297]: segfault at 0000000c eip 0808f818 esp
bff7a294 error 4
>>> dmesg output end

Here is a disassembly of beam with some context around 808f818 :

>>> disassembly start
 808f7fa: 5f                    pop    %edi
 808f7fb: c3                    ret
 808f7fc: 8b 51 0c              mov    0xc(%ecx),%edx
 808f7ff: 39 da                 cmp    %ebx,%edx
 808f801: 0f 84 96 00 00 00     je     808f89d <tree_insert_fixup+0x11d>
 808f807: 8b 43 08              mov    0x8(%ebx),%eax
 808f80a: 8b 50 08              mov    0x8(%eax),%edx
 808f80d: 83 60 04 fd           andl   $0xfffffffd,0x4(%eax)
 808f811: 8b 4a 10              mov    0x10(%edx),%ecx
 808f814: 83 4a 04 02           orl    $0x2,0x4(%edx)
 808f818: 8b 41 0c              mov    0xc(%ecx),%eax
 808f81b: 85 c0                 test   %eax,%eax
 808f81d: 89 42 10              mov    %eax,0x10(%edx)
 808f820: 74 03                 je     808f825 <tree_insert_fixup+0xa5>
 808f822: 89 50 08              mov    %edx,0x8(%eax)
 808f825: 8b 42 08              mov    0x8(%edx),%eax
 808f828: 85 c0                 test   %eax,%eax
 808f82a: 89 41 08              mov    %eax,0x8(%ecx)
 808f82d: 74 6a                 je     808f899 <tree_insert_fixup+0x119>
 808f82f: 8b 42 08              mov    0x8(%edx),%eax
 808f832: 3b 50 0c              cmp    0xc(%eax),%edx
>>> disassembly start

ldd erts-5.8.5/bin/beam
linux-gate.so.1 =>  (0xb76fe000)
libutil.so.1 => /lib/tls/i686/cmov/libutil.so.1 (0xb76f2000)
libdl.so.2 => /lib/tls/i686/cmov/libdl.so.2 (0xb76ee000)
libm.so.6 => /lib/tls/i686/cmov/libm.so.6 (0xb76c8000)
libncurses.so.5 => /lib/libncurses.so.5 (0xb7698000)
libpthread.so.0 => /lib/tls/i686/cmov/libpthread.so.0 (0xb7680000)
librt.so.1 => /lib/tls/i686/cmov/librt.so.1 (0xb7677000)
libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb7528000)
/lib/ld-linux.so.2 (0xb76ff000)

I'm running R14B04 on ubuntu 8.04 32bit built using gcc:

gcc -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v
--enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr
--enable-shared --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix --enable-nls
--with-gxx-include-dir=/usr/include/c++/4.2 --program-suffix=-4.2
--enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc
--enable-mpfr --enable-targets=all --enable-checking=release
--build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.2.4 (Ubuntu 4.2.4-1ubuntu4)


Has anybody seen something similar ?

BR

-- 
Ruan Jonker
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