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Most often when you see something go wrong in the allocator code, it
is because somewhere there is a driver/nif that has been writing
just outside a buffer allocated by driver_alloc. So check any
non-otp drivers/nifs that you use for memory corruption bugs. <br>
<br>
Also if you can reproduce the error, then running it with a debug
compiled erlang emulator should help to point at the error. <br>
<br>
Lukas<br>
<br>
<div class="moz-cite-prefix">On 09/10/13 12:04, Jesper Louis
Andersen wrote:<br>
</div>
<blockquote
cite="mid:CAGrdgiXu-eX7st7ejxCBSXMa+Va=5vURUQqNmjXY56cU266ajQ@mail.gmail.com"
type="cite">
<div dir="ltr">Have you tried running a git blame on the allocator
code to see if there is a change recently to it? R14B04 is
pretty old, so the code base might have changed quite a lot
since then.</div>
<div class="gmail_extra">
<br>
<br>
<div class="gmail_quote">On Wed, Oct 9, 2013 at 6:14 AM, Ruan
Jonker <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:ruan.jonker@gmail.com" target="_blank">ruan.jonker@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hi All,<br>
<div><br>
Just some more info :<br>
<br>
<br>
addr2line -e
/home/mtrouter/mira_mt_router/erts-5.8.5/bin/beam
0808f818<br>
/home/erlang/src/otp_src_R14B04/erts/emulator/beam/erl_bestfit_alloc.c:228<br>
<br>
</div>
<div>BR<br>
<br>
</div>
<div>Ruan<br>
</div>
<div><br>
<br>
</div>
</div>
<div class="gmail_extra">
<div>
<div class="h5"><br>
<br>
<div class="gmail_quote">On Tue, Oct 8, 2013 at 10:14
AM, Ruan Jonker <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:ruan.jonker@gmail.com"
target="_blank">ruan.jonker@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">Hi
All,</div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br>
</div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">I've
recently encountered the following in dmesg
output after one of my VM's crashed:</div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br>
</div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">>>>
dmesg output start </div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
<div>[2827116.693283] beam[28297]: segfault at
0000000c eip 0808f818 esp bff7a294 error 4</div>
</div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
<div>>>> dmesg output end</div>
<div><br>
</div>
</div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">Here
is a disassembly of beam with some context
around 808f818 :</div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br>
</div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">>>>
disassembly start</div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
<div> 808f7fa:<span
style="white-space:pre-wrap"> </span>5f
<span> </span><span
style="white-space:pre-wrap"> </span>pop
%edi</div>
<div> 808f7fb:<span
style="white-space:pre-wrap"> </span>c3
<span> </span><span
style="white-space:pre-wrap"> </span>ret
</div>
<div> 808f7fc:<span
style="white-space:pre-wrap"> </span>8b
51 0c <span> </span><span
style="white-space:pre-wrap"> </span>mov
0xc(%ecx),%edx</div>
<div> 808f7ff:<span
style="white-space:pre-wrap"> </span>39
da <span
style="white-space:pre-wrap"> </span>cmp
%ebx,%edx</div>
<div> 808f801:<span
style="white-space:pre-wrap"> </span>0f <a
moz-do-not-send="true"
href="tel:84%2096%2000%2000%2000"
value="+18496000000" target="_blank">84 96
00 00 00</a> <span
style="white-space:pre-wrap"> </span>je
808f89d <tree_insert_fixup+0x11d></div>
<div> 808f807:<span
style="white-space:pre-wrap"> </span>8b
43 08 <span> </span><span
style="white-space:pre-wrap"> </span>mov
0x8(%ebx),%eax</div>
<div> 808f80a:<span
style="white-space:pre-wrap"> </span>8b
50 08 <span> </span><span
style="white-space:pre-wrap"> </span>mov
0x8(%eax),%edx</div>
<div> 808f80d:<span
style="white-space:pre-wrap"> </span>83
60 04 fd <span
style="white-space:pre-wrap"> </span>andl
$0xfffffffd,0x4(%eax)</div>
<div> 808f811:<span
style="white-space:pre-wrap"> </span>8b
4a 10 <span> </span><span
style="white-space:pre-wrap"> </span>mov
0x10(%edx),%ecx</div>
<div> 808f814:<span
style="white-space:pre-wrap"> </span>83
4a 04 02 <span
style="white-space:pre-wrap"> </span>orl
$0x2,0x4(%edx)</div>
<div> 808f818:<span
style="white-space:pre-wrap"> </span>8b
41 0c <span> </span><span
style="white-space:pre-wrap"> </span>mov
0xc(%ecx),%eax</div>
<div> 808f81b:<span
style="white-space:pre-wrap"> </span>85
c0 <span
style="white-space:pre-wrap"> </span>test
%eax,%eax</div>
<div> 808f81d:<span
style="white-space:pre-wrap"> </span>89
42 10 <span> </span><span
style="white-space:pre-wrap"> </span>mov
%eax,0x10(%edx)</div>
<div> 808f820:<span
style="white-space:pre-wrap"> </span>74
03 <span
style="white-space:pre-wrap"> </span>je
808f825 <tree_insert_fixup+0xa5></div>
<div> 808f822:<span
style="white-space:pre-wrap"> </span>89
50 08 <span> </span><span
style="white-space:pre-wrap"> </span>mov
%edx,0x8(%eax)</div>
<div> 808f825:<span
style="white-space:pre-wrap"> </span>8b
42 08 <span> </span><span
style="white-space:pre-wrap"> </span>mov
0x8(%edx),%eax</div>
<div> 808f828:<span
style="white-space:pre-wrap"> </span>85
c0 <span
style="white-space:pre-wrap"> </span>test
%eax,%eax</div>
<div> 808f82a:<span
style="white-space:pre-wrap"> </span>89
41 08 <span> </span><span
style="white-space:pre-wrap"> </span>mov
%eax,0x8(%ecx)</div>
<div> 808f82d:<span
style="white-space:pre-wrap"> </span>74
6a <span
style="white-space:pre-wrap"> </span>je
808f899 <tree_insert_fixup+0x119></div>
<div> 808f82f:<span
style="white-space:pre-wrap"> </span>8b
42 08 <span> </span><span
style="white-space:pre-wrap"> </span>mov
0x8(%edx),%eax</div>
<div> 808f832:<span
style="white-space:pre-wrap"> </span>3b
50 0c <span> </span><span
style="white-space:pre-wrap"> </span>cmp
0xc(%eax),%edx</div>
<div>>>> disassembly start</div>
<div>
<br>
</div>
<div>ldd erts-5.8.5/bin/beam</div>
<div><span style="white-space:pre-wrap"> </span>linux-gate.so.1
=> (0xb76fe000)</div>
<div><span style="white-space:pre-wrap"> </span>libutil.so.1
=> /lib/tls/i686/cmov/libutil.so.1
(0xb76f2000)</div>
<div><span style="white-space:pre-wrap"> </span>libdl.so.2
=> /lib/tls/i686/cmov/libdl.so.2
(0xb76ee000)</div>
<div><span style="white-space:pre-wrap"> </span>libm.so.6
=> /lib/tls/i686/cmov/libm.so.6
(0xb76c8000)</div>
<div><span style="white-space:pre-wrap"> </span>libncurses.so.5
=> /lib/libncurses.so.5 (0xb7698000)</div>
<div><span style="white-space:pre-wrap"> </span>libpthread.so.0
=> /lib/tls/i686/cmov/libpthread.so.0
(0xb7680000)</div>
<div><span style="white-space:pre-wrap"> </span>librt.so.1
=> /lib/tls/i686/cmov/librt.so.1
(0xb7677000)</div>
<div><span style="white-space:pre-wrap"> </span>libc.so.6
=> /lib/tls/i686/cmov/libc.so.6
(0xb7528000)</div>
<div><span style="white-space:pre-wrap"> </span>/lib/ld-linux.so.2
(0xb76ff000)</div>
<div> <br>
</div>
</div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">I'm
running R14B04 on ubuntu 8.04 32bit built
using gcc:<br>
<br>
</div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">gcc
-v<br>
Using built-in specs.<br>
Target: i486-linux-gnu<br>
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<br>
Thread model: posix<br>
gcc version 4.2.4 (Ubuntu 4.2.4-1ubuntu4)<br>
</div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br>
<br>
</div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">Has
anybody seen something similar ?<br>
</div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br>
</div>
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">BR<span><font
color="#888888"><br>
</font></span></div>
<span><font color="#888888">
<div
style="color:rgb(34,34,34);font-family:arial;font-size:small;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br>
</div>
-- <br>
Ruan Jonker<br>
</font></span></div>
</blockquote>
</div>
<br>
<br clear="all">
<br>
</div>
</div>
<span class="HOEnZb"><font color="#888888">-- <br>
Ruan Jonker<br>
South Africa<br>
<a moz-do-not-send="true" href="tel:%2B27824619036"
value="+27824619036" target="_blank">+27824619036</a><br>
</font></span></div>
<br>
_______________________________________________<br>
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target="_blank">http://erlang.org/mailman/listinfo/erlang-bugs</a><br>
<br>
</blockquote>
</div>
<br>
<br clear="all">
<div><br>
</div>
-- <br>
J.
</div>
<br>
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