Re: random collector hangs

Mike Fisher wrote:
> Ed Ravin wrote:
>> Dumb ass idea but it might work - switch from the default SNMP library
>> to Net-SNMP's library.  The Net-SNMP code has been tested against
>> modern platforms, and is less likely to have 64-bit porting bugs.
>>   
>>     
> That's a possibility.  I'll give it a shot when I get back to it.
>   

That didn't help fix it, but it did help push the issue to a lower 
level.  The hangs happen when using  the Net-SNMP module as well.

[root:log]# strace -p 959
Process 959 attached - interrupt to quit
recvfrom(4,  <unfinished ...>

[root:log]# pstack 959
#0  0x00000037d1d0b585 in __recvfrom_nocancel ()
#1  0x0000002a95a44be7 in netsnmp_tcp6_ctor () from 
/usr/lib64/libnetsnmp.so.5
#2  0x0000002a95a24ae2 in _sess_read () from /usr/lib64/libnetsnmp.so.5
#3  0x0000002a95a258a9 in snmp_sess_read () from /usr/lib64/libnetsnmp.so.5
#4  0x0000002a95a258f0 in snmp_read () from /usr/lib64/libnetsnmp.so.5
#5  0x0000002a95a00aa0 in snmp_synch_response_cb ()
#6  0x0000002a95ca1c5e in __libraries_init ()
#7  0x0000002a95caa7ac in XS_SNMP__get ()
#8  0x00000037d259e8bb in Perl_pp_entersub ()
#9  0x00000037d258281a in Perl_runops_debug ()
#10 0x00000037d253b594 in perl_run ()
#11 0x00000000004019dc in main ()

For comparison, the stack looks like this when using the default 
SNMP_Session module:

[root@nalnxmlt003 log]# pstack 2987
#0  0x00000037d1d0b585 in __recvfrom_nocancel ()
#1  0x00000037d25db20f in Perl_pp_sysread ()
#2  0x00000037d258281a in Perl_runops_debug ()
#3  0x00000037d253b594 in perl_run ()
#4  0x00000000004019dc in main ()

I've found numerous mentions of similar problems is several apps via 
Google, most dating from the 2004-2005 time frame.  None pointed to a 
definite solution though.  Next stop kernel update.

Mike



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