[erlang-bugs] Segmentation Fault R13B01

Georgos Siganos <>
Wed Jul 1 18:33:30 CEST 2009


Hi,I build erlang using gcc 4.1.2 (the default for centos)
I started erl using
 -env ERL_MAX_PORTS 110000 +K true +P 110000 +S4 -smp -detached

You can download 3 core dumps
http://94.75.214.130/core.12514.gz
http://94.75.214.130/core.939.gz
http://94.75.214.130/core.28223.gz

Unfortunately, i have no clue which part of the code triggers the
segfault, other than it happens constantly, and i
can not redistribute the whole program. The program though uses heavily tcp
connections, typically i have over
10k established tcp connections.

I would try to build the debug emulator tonight and let you know if i find
something.

Thanks,
Georgos

2009/7/1 Raimo Niskanen
<<raimo%>
>

> On Wed, Jul 01, 2009 at 05:25:14PM +0200, Georgos Siganos wrote:
> > Hi All,I am having problems with R13B01 and segmentation faults, as the
> > following one (in the bottom).
> > Unfortunately, i am not sure which part of the code triggers the
> > segmentation fault.
> >
> > I am running Centos 5.3 ( 2.6.18-128.1.16.el5 #1 SMP x86_64 ) on a quad
> core
> > intel processor.
> > The program quits with segfault both when compiled with and without hipe.
> >
> > Please let me know if there is anything else i can report to fix this
> > problem. This
> > segmentation
> > fault is quite consistent and is a show stopper for my code.
> > Thanks,
> > Georgos
>
> How did you build the Erlang emulator, how did you start it
> (arguments), how did you provoke the segfault?
>
> Can you post the code that provokes this to see
> if it is reproducable on other OS:es?
>
> Can you post the core dump for the Erlang/OTP team to dissect?
>
> Can you build and run a debug emulator and see if you get an earlier
> fault detection? (gmake smp TYPE=debug in the emulator directory)
>
> >
> >
> > ----------------------- gdb output --------------------------
> > Program terminated with signal 11, Segmentation fault.
> > [New process 12531]
> > [New process 12533]
> > [New process 12532]
> > [New process 12530]
> > [New process 12526]
> > [New process 12517]
> > [New process 12516]
> > [New process 12514]
> > #0  0x00002add1f7b570b in memcpy () from /lib64/libc.so.6
> > (gdb) bt
> > #0  0x00002add1f7b570b in memcpy () from /lib64/libc.so.6
> > #1  0x0000000000486849 in driver_deliver_term (port=<value optimized
> out>,
> > to=4816451, data=<value optimized out>,
> >     len=<value optimized out>) at beam/io.c:2994
> > #2  0x00000000005513cf in tcp_deliver (desc=0x2aab17c17548, len=3) at
> > drivers/common/inet_drv.c:2980
> > #3  0x0000000000551891 in tcp_recv (desc=0x2aab17c17548, request_len=0)
> at
> > drivers/common/inet_drv.c:8043
> > #4  0x0000000000551afc in tcp_inet_drv_input (data=0x2aaae21a9fc4,
> > event=<value optimized out>) at drivers/common/inet_drv.c:8381
> > #5  0x00000000004a3d78 in erts_port_task_execute (runq=0x2add1fc19340,
> > curr_port_pp=0x2aaaaaacb1e8) at beam/erl_port_task.c:853
> > #6  0x000000000049ebc5 in schedule (p=0x349, calls=<value optimized out>)
> at
> > beam/erl_process.c:6116
> > #7  0x0000000000505afd in process_main () at beam/beam_emu.c:1126
> > #8  0x0000000000499126 in sched_thread_func (vesdp=<value optimized out>)
> at
> > beam/erl_process.c:3015
> > #9  0x000000000057a0f4 in thr_wrapper (vtwd=<value optimized out>) at
> > common/ethread.c:475
> > #10 0x00002add1f31b367 in start_thread () from /lib64/libpthread.so.0
> > #11 0x00002add1f80cf7d in clone () from /lib64/libc.so.6
> >
> ---------------------------------------------------------------------------
>
> --
>
> / Raimo Niskanen, Erlang/OTP, Ericsson AB
>


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