[erlang-questions] crash while garbing - OTP-7132

Lukas Larsson <>
Thu Feb 6 10:38:17 CET 2014


The commit comment for this change is quite telling:
https://github.com/erlang/otp/commit/b628ebe21a7b449eea27ada811dfbb007afe6d0b

If you suspect that this could be the culprit maybe you could try to
backport the patch?

Also keep in mind that the =memory section lists it in bytes while =proc
sections list heap in words.

Lukas


On Thu, Feb 6, 2014 at 6:35 AM, satoshi kinoshita <> wrote:

> Does any one know some more detail information for OTP-7132?
>
>
> --- http://www.erlang.org/doc/apps/erts/notes.html#id114389 ----
> The emulator could under rare circumstances crash while garbage collecting.
>
> Own Id: OTP-7132
> ----------------------------------------------------------------
>
> We're still using R11B-5 and having a crash while doing GC on a process.
> Though erl_crash.dump is reporting almost 2GB was used for "processes",
>
> top/vmstat is just reporting less than 1GB for beam.smp.
>
> It is also strange to me that sum of heap and OldHeap for all processes
> are less than 100M, but processes_used is almost 1.6G.
>
> I don't know OTP-7132 is related. Any information will be appreciated.
>
> Thanks,
> Kinoshita
>
>
> --------------------------------------------------------------------
> % { grep +heap: erl_crash.dump |cut -d' ' -f2 |tr "\n" +; echo 0; }|bc
> 46165303
> % { grep OldHeap: erl_crash.dump |cut -d' ' -f2 |tr "\n" +; echo 0; }|bc
> 52591961
>
>
> ---------------------------------------------------------------------------------
> =erl_crash_dump:0.1
> Thu Jan 30 17:42:24 2014
> Slogan: eheap_alloc: Cannot allocate 191315400 bytes of memory (of type "heap").
>
> System version: Erlang (BEAM) emulator version 5.5.5 [source] [smp:8] [async-threads:64] [hipe] [kernel-poll:true]
> Compiled: Mon Jan 21 18:01:53 2008
> Atoms: 9703
> =memory
> total: 1843551840
> processes: 1640736600
>
> processes_used: 1626764688
> system: 202815240
> atom: 433065
> atom_used: 428224
> binary: 159095424
> code: 4043588
> ets: 21895748
> =hash_table:atom_tab
> size: 6421
> used: 5001
> objs: 9703
> depth: 8
>
> ...
>
> =proc:<0.29953.0>
> State: Garbing
> Name: mgs_db_mgse
> Spawned as: proc_lib:init_p/5
> Spawned by: <0.23670.0>
> Started: Thu Sep  1 22:58:50 2011
> Message queue length: 0
> Number of heap fragments: 332
>
> Heap fragment data: 34968
> Link list: [<0.23670.0>, {from,<0.28232.7497>,#Ref<0.0.29467.224716>}]
> Reductions: 3060681751
> Stack+heap: 38263080
> OldHeap: 47828850
> Heap unused: 116
> OldHeap unused: 47828850
>
> Program counter: 0xb5d7b7bc (mnesia_locker:receive_wlocks/4 + 64)
> CP: 0xb5939d50 (mnesia_tm:execute_transaction/5 + 340)
>
>
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> 
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