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<p align="left">I've got lots of cores... but they are all from optimized builds.</font></font></font><font face="Times New Roman" color="#000000" size="3">
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<p dir="ltr" align="left">Has this been seen in other versions? We are keen to solve this because it's causing us pain in production. We hit another, older, memory bug (the 32bit values used in 64bit build)... and now this.
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<p dir="ltr" align="left">I'm going to be building and trying R15B01 to see if we hit it as well. I'll send any additional information I can.</font></font></font><font face="Times New Roman" color="#000000" size="3"> <span class="403263615-20112012"><font face="Arial" color="#0000ff" size="2">Any
suggestions on debugging beam would be appreciated. Compile options, etc.</font></span></font></p>
<p dir="ltr" align="left">Thanks.<font face="Times New Roman" color="#000000" size="3">
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<p dir="ltr" align="left">-antonio</font></font></font></font><br />
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<font face="Tahoma" size="2"><b>From:</b> erlang-bugs-bounces@erlang.org [mailto:erlang-bugs-bounces@erlang.org]
<b>On Behalf Of </b>Patrik Nyblom<br />
<b>Sent:</b> Monday, November 19, 2012 8:55 AM<br />
<b>To:</b> erlang-bugs@erlang.org<br />
<b>Subject:</b> Re: [erlang-bugs] beam core'ing<br />
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<div class="moz-cite-prefix">On 11/19/2012 02:01 PM, Musumeci, Antonio S wrote:<br />
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<blockquote cite="mid:51C6F20DC46369418387C5250127649B039D96@HZWEX2014N4.msad.ms.com" type="cite">
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<p><span class="483463912-19112012"><font face="Arial" size="2">I'm just starting to debug this but figured I'd send it along in case anyone has seen this before.</font></span></p>
<p><span class="483463912-19112012"><font face="Arial" size="2">64bit RHEL 5.0.1</font></span></p>
<p><span class="483463912-19112012"><font face="Arial" size="2">built from source beam.smp R15B02</font></span></p>
<p><span class="483463912-19112012"><font face="Arial" size="2">Happens consistently when trying to start our app and then just stops after a time. Across a few boxes. Oddly we have an identical cluster (hw and sw) and it never happens.</font></span></p>
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<font size="2"><font face="Arial">Yes! I've seen it before and have tried for several months to get a<font size="2"> reproducable example and a<font size="2">
</font>core i can analyze here. I've had one core that was<font size="2"> somewhat readable but had no luck in locating the beam code that triggered this. If you could try narrowing it down, I would be really grateful!<br />
<br />
<font size="2">Please email me any findings, theories, cores dumps<font size="2"> - anything! I really want to find this! The most interesting would be to find the snippet of erlang code that makes this happen (intermittently probably).<br />
<br />
<font size="2">The problem is <font size="2">that <font size="2">when the allocators crash, the error is usually somewhere else<font size="2">.</font>
<font size="2">A</font>ccess of freed memory, double free or something else doing horrid things to memory. Ob<font size="2">viously none of our testsui<font size="2">tes e<font size="2">xercise this bug as
<font size="2">neither our debug builds, nor our valgrind runs find it. It happens on both SMP and non SMP and is always in the context of the er<font size="2">ts</font>_bs_append</font></font></font></font></font></font></font></font></font></font>, so I'm
pretty sure this has a connection to the other users seeing the crash in the allocat<font size="2">ors<font size="2">...</font></font>
</font></font></font><br />
<br />
Cheers,<br />
Patrik<br />
<blockquote cite="mid:51C6F20DC46369418387C5250127649B039D96@HZWEX2014N4.msad.ms.com" type="cite">
<div><span lang="EN">
<p>#0 bf_unlink_free_block (flags=<optimized out>, block=0x6f00, allctr=<optimized out>) at beam/erl_bestfit_alloc.c:789<br />
#1 bf_get_free_block (allctr=0x6824600, size=304, cand_blk=0x0, cand_size=<optimized out>, flags=0) at beam/erl_bestfit_alloc.c:869<br />
#2 0x000000000045343c in mbc_alloc_block (alcu_flgsp=<optimized out>, blk_szp=<optimized out>, size=<optimized out>, allctr=<optimized out>) at beam/erl_alloc_util.c:1198<br />
#3 mbc_alloc (allctr=0x6824600, size=295) at beam/erl_alloc_util.c:1345<br />
#4 0x000000000045398d in do_erts_alcu_alloc (type=164, extra=0x6824600, size=295) at beam/erl_alloc_util.c:3442<br />
#5 0x0000000000453a0f in erts_alcu_alloc_thr_pref (type=164, extra=<optimized out>, size=287) at beam/erl_alloc_util.c:3520<br />
#6 0x0000000000511463 in erts_alloc (size=287, type=<optimized out>) at beam/erl_alloc.h:208<br />
#7 erts_bin_nrml_alloc (size=<optimized out>) at beam/erl_binary.h:260<br />
#8 erts_bs_append (c_p=0x69fba60, reg=<optimized out>, live=<optimized out>, build_size_term=<optimized out>, extra_words=0, unit=8)<span class="483463912-19112012">
</span>at beam/erl_bits.c:1327<br />
#9 0x000000000053ffd8 in process_main () at beam/beam_emu.c:3858 <br />
#10 0x00000000004ae853 in sched_thread_func (vesdp=<optimized out>) at beam/erl_process.c:5184<span class="483463912-19112012">
<br />
</span>#11 0x00000000005c17e9 in thr_wrapper (vtwd=<optimized out>) at pthread/ethread.c:106<span class="483463912-19112012">
<br />
</span>#12 0x00002b430f39e73d in start_thread () from /lib64/libpthread.so.0<span class="483463912-19112012">
<br />
</span>#13 0x00002b430f890f6d in clone () from /lib64/libc.so.6<span class="483463912-19112012">
<br />
</span>#14 0x0000000000000000 in ?? ()</p>
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