[erlang-questions] Segfault in do_allocate_logger_message

[Vince Foley]

Hi folks, I recently encountered a pretty strange segfault, and I was
wondering if anyone could provide any insight...

The process is running just fine and then disappears. I grabbed the
coredump and opened it up and found this output:

```
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00000000004c9511 in do_allocate_logger_message (p=<synthetic
pointer>, sz=280577276613695, bp=<synthetic pointer>, ohp=<synthetic
pointer>, hp=0x7f97ba57f7f0, gleader=128)
    at beam/utils.c:1958
```

There's a little more context in the backtrace...

```
(gdb) backtrace
#0  0x00000000004c9511 in do_allocate_logger_message (p=<synthetic
pointer>, sz=280577276613695, bp=<synthetic pointer>, ohp=<synthetic
pointer>, hp=0x7f97ba57f7f0, gleader=128)
    at beam/utils.c:1958
#1  do_send_term_to_logger (tag=843, args=140289643116560, len=-966352886,
buf=0x7f97c1f7db72 "", gleader=128) at beam/utils.c:2058
#2  send_error_term_to_logger (args=140289643116560, len=-966352886,
buf=0x7f97c1f7db72 "", gleader=128) at beam/utils.c:2106
#3  erts_send_error_term_to_logger (gleader=128, dsbufp=0x7f97c1f7db70,
args=140289643116560) at beam/utils.c:2187
#4  0x000000000059d990 in erts_bs_put_utf8 (EBS=0x7f97c1f7db72,
arg=140289845403658) at beam/erl_bits.c:850
#5  0x00007f97bfb79898 in ?? ()
#6  0x000000000000001e in ?? ()
#7  0x00007f97b5c675a8 in ?? ()
#8  0x00007f97bb25b5d8 in ?? ()
#9  0x00007f97b5c25ad8 in ?? ()
#10 0x00007f97c1f7b282 in ?? ()
#11 0x8450345d9c222796 in ?? ()
#12 0x00007f97bfc47008 in ?? ()
#13 0x00007f97bc8c3338 in ?? ()
#14 0x0000000000449c14 in process_main (x_reg_array=0x7f97b5c66d30,
f_reg_array=0x7f97c666a00a) at x86_64-pc-linux-musl/opt/smp/beam_hot.h:943
#15 0x00007f97bba80100 in ?? ()
#16 0x0000000000000000 in ?? ()
```

I do have an error_handler module added to the error_logger. Although there
doesn't appear to be any noticable memory growth or message queue backup in
the error_logger process before it dies.

I can't quite trigger it myself but it does happen on a regular basis.

Erlang/OTP 20 [erts-9.3] [source] [64-bit] [smp:16:16] [ds:16:16:10]
[async-threads:10] [hipe] [kernel-poll:false]
Elixir 1.6.4 (compiled with OTP 20)
Alpine 3.7

Anyone have any clues?
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