Re: SNMPd panic: unregister_config_handler

Any one noticed this?


On Fri, Jan 11, 2013 at 5:57 PM, pal snmp <[email protected]> wrote:

> I created a subagent, which got dynamically linked with snmp agent.
> During stop and start, I noticed the following crash in snmpd service.
> The module snmp was trying to unregister was in fact compiled/linked
> properly with subagent (as you can see in 'nm' output). Could anyone let
> me know what could have happened that caused the crash here?
>
>
> (gdb) bt
> #0  0x000000381e8091eb in check_match.12440 () from
> /lib64/ld-linux-x86-64.so.2
> #1  0x000000381e809b87 in do_lookup_x () from /lib64/ld-linux-x86-64.so.2
> #2  0x000000381e809e1a in _dl_lookup_symbol_x () from
> /lib64/ld-linux-x86-64.so.2
> #3  0x000000381ed238d6 in do_sym () from /lib64/libc.so.6
> #4  0x000000381f0010c4 in dlsym_doit () from /lib64/libdl.so.2
> #5  0x000000381e80e176 in _dl_catch_error () from
> /lib64/ld-linux-x86-64.so.2
> #6  0x000000381f00129c in _dlerror_run () from /lib64/libdl.so.2
> #7  0x000000381f00107a in dlsym () from /lib64/libdl.so.2
> #8  0x00007f6be6aa9074 in dlmod_unload_module (dlm=0x8fe6c0) at
> ucd-snmp/dlmod.c:159
> #9  0x00007f6be6aa9506 in dlmod_free_config () at ucd-snmp/dlmod.c:245
> #10 0x00007f6be67dd557 in unregister_config_handler (type_param=<value
> optimized out>, token=<value optimized
> out>)
>     at read_config.c:425
> #11 0x00007f6be6aa8040 in shutdown_dlmod () at ucd-snmp/dlmod.c:612
> #12 0x00007f6be6b49b7d in _shutdown_mib_modules (majorID=<value optimized
> out>, minorID=<value optimized out>,
>     serve=<value optimized out>, client=<value optimized out>) at
> ../agent/mibgroup/mib_module_shutdown.h:7
> #13 0x00007f6be67e7a96 in snmp_call_callbacks (major=0, minor=2,
> caller_arg=0x0) at callback.c:363
> #14 0x00007f6be67c0767 in snmp_shutdown (type=<value optimized out>) at
> snmp_api.c:908
> #15 0x00000000004037e1 in main (argc=<value optimized out>, argv=<value
> optimized out>) at snmpd.c:1096
> (gdb) f 8
> #8  0x00007f6be6aa9074 in dlmod_unload_module (dlm=0x8fe6c0) at
> ucd-snmp/dlmod.c:159
> 159     dl_deinit = dlsym(dlm->handle, sym_deinit);
> (gdb) p *dlm
> $1 = {next = 0x909950, index = 14, name = "exampleTable", '\000' <repeats
> 34 times>,
>   path = "/usr/lib/snmp/dlmod/exampleStats.so", '\000' <repeats 211
> times>,
>   error = '\000' <repeats 255 times>, handle = 0x8fe970, status = 1}
> (gdb) p sym_deinit
> $2 =
>
> "deinit_exampleTable\000\000\000PMk\177\377\177\000\000\325\033\201\346k\177\000\000\300Mk\177\377\177\000\000\377\001\000\000\000\000\000\000p\243"
> (gdb)
>
> bash$ nm /usr/lib/snmp/dlmod/exampleStats.so | grep deinit
> 0000000000002c65 T deinit_exampleStatsTable2
> 00000000000043de T deinit_exampleTable
> bash$
>
>

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