[erlang-questions] Erlang initiated kernel panic on OSX

acidbriggs <>
Mon Nov 26 22:02:40 CET 2012


Don't get me wrong, I have no doubts that it's an OS X bug. But, getting that fixed via Apple is next to impossible. I am not sure of the mechanism as to why it crashes the OS, but it does. It is reproducible. I was just hoping someone might know how to patch Erlang to help avoid the OS X bug as it's really irritating.

If anyone is curious you can see that the process that caused the panic was named "beam.smp":

Interval Since Last Panic Report:  2399141 sec
Panics Since Last Report:          1
Anonymous UUID:                    1C24E5B9-05B7-8082-2863-4E5C3ECA6AEC

Thu Nov 15 11:44:13 2012
panic(cpu 2 caller 0xffffff8006d1fdca): "negative open count (c, 16, 3)"@/SourceCache/xnu/xnu-2050.18.24/bsd/miscfs/specfs/spec_vnops.c:1813
Backtrace (CPU 2), Frame : Return Address
0xffffff80f7e1bbe0 : 0xffffff8006c1d626 
0xffffff80f7e1bc50 : 0xffffff8006d1fdca 
0xffffff80f7e1bc90 : 0xffffff8006d24c56 
0xffffff80f7e1bce0 : 0xffffff8006d11c96 
0xffffff80f7e1bd20 : 0xffffff8006d094af 
0xffffff80f7e1bd50 : 0xffffff8006d08645 
0xffffff80f7e1bda0 : 0xffffff8006f4c56c 
0xffffff80f7e1be10 : 0xffffff8006f4cae6 
0xffffff80f7e1be50 : 0xffffff8006f5697b 
0xffffff80f7e1bec0 : 0xffffff8006c39cc9 
0xffffff80f7e1bef0 : 0xffffff8006c3c7c8 
0xffffff80f7e1bf20 : 0xffffff8006c3c63e 
0xffffff80f7e1bf50 : 0xffffff8006c1b70d 
0xffffff80f7e1bf90 : 0xffffff8006cb8163 
0xffffff80f7e1bfb0 : 0xffffff8006cce4bc 

BSD process name corresponding to current thread: beam.smp

Mac OS version:
12C60



On Nov 26, 2012, at 3:51 PM, Max Lapshin <> wrote:

> How erlang be guilty in killing kernel of unix OS? It isn't DOS
> What is the exact mechanism of this Mac failure (and it is definitely Mac failure, not erlang failure).
> 
> 
> On Tue, Nov 27, 2012 at 12:28 AM, <> wrote:
> Back in March of 2010 it was reported that it was possible to initiate a kernel panic on OS X 10.6.2 with Erlang.
> 
> Does anyone know if there is a fix for this? This is still happening in OS X 10.8.2 with Erlang R15B02. I've had it happen on all three of my Macs when working in Emacs and killing an Erlang shell in a buffer in a non-clean way.
> 
> I know that the problem was reported to Apple but we know how that is.
> 
> Perhaps someone has some sort of patch that can be applied to Erlang that can stop it from exploiting this flaw?
> 
> Thanks for your time,
> 
> 
> Briggs
> 
> 
> 
> 
> The original thread (http://erlang.org/pipermail/erlang-questions/2010-March/050112.html) stated:
> 
> 
> Greetings,
> 
> Using Snow Leopard 10.6.2 and Erlang R13B04 it's possible to cause a
> kernel panic using the following steps:
> 
> 1. Start new terminal window
> 2. erl +K true -s crypto
> 3. Cmd-W (close the terminal window without stopping erlang)
> 
> Alternatively, if you're running SL 10.6.2 and Erlang R13B03:
> 
> 1. Start new terminal window
> 2. erl +K true -s crypto
> 3. Cmd-Q (quit the terminal app without stopping erlang)
> 
> This appears to work with either 32 or 64 bit builds of Erlang.
> 
> 
> Thanks,
> 
> D.
> 
> 
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> erlang-questions mailing list
> 
> http://erlang.org/mailman/listinfo/erlang-questions
> 

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