Breaking Varnish

[Tim Kientzle]

Dual-core AMD processor using the x86_64 kernel.  Uname shows:

Linux 2.6.21.5 #9 SMP Thu Aug 16 17:21:29 UTC 2007 x86_64 AMD  
Opteron(tm) Processor 248 AuthenticAMD GNU/Linux


On Jan 21, 2009, at 2:01 PM, Iliya Sharov wrote:
> amd64 or i386 architecture?
>
> Tim Kientzle пишет:
>> We're evaluating Varnish as a possible replacement for our
>> installed Squid servers.  Performance-wise, Varnish is very
>> impressive, and we're pretty pleased with the configuration
>> flexibility.
>>
>> But...
>>
>> Under heavy load, we're seeing a lot of segfaults and
>> assertion failures.  I've pasted an excerpt below of
>> two of the issues we've seen using Varnish 2.0.2 on Linux
>> 2.6.21 kernel with the default VCL (using command-line options
>> to set the listen address and the addresses of the two back-end
>> servers).
>>
>> We're going to repeat these tests and see if we can get
>> more detail, possibly including core dumps.  What other
>> information would be useful in diagnosing and fixing
>> these issues?
>>
>> Cheers,
>>
>> Tim Kientzle
>>
>> ==========================================================
>>
>> 1) Varnish repeatedly died due to SIGSEGV:
>>
>> child (2816) Started
>> Child (2816) said Closed fds: 4 7 8 10 11
>> Child (2816) said Child starts
>> Child (2816) said managed to mmap 49392648192 bytes of 49392648192
>> Child (2816) said Ready
>> Child (2816) died signal=11
>> Child cleanup complete
>>
>> 2) Varnish repeatedly died due to SIGABRT:
>>
>> child (3017) Started
>> Child (3017) said Closed fds: 4 7 8 10 11
>> Child (3017) said Child starts
>> Child (3017) said managed to mmap 49392648192 bytes of 49392648192
>> Child (3017) said Ready
>> Child (3017) died signal=6
>> Child (3017) Panic message: Assert error in cnt_lookup(),
>> cache_center.c line 625:
>>   Condition(sp->objhead != NULL) not true. thread = (cache-worker)sp
>> = 0x2afee0fb3008 {
>>   fd = -1, id = 15, xid = 0,
>>   client = 10.2.8.27:45430,
>>   step = STP_DONE,
>>   handling = DELIVER,
>>   ws = 0x2afee0fb3078 {
>>     id = "sess",
>>     {s,f,r,e} = {0x2afee0fb37b0,,+587,(nil),+8192},
>>   },
>> },
>> _______________________________________________
>> varnish-misc mailing list
>> varnish-misc at projects.linpro.no
>> http://projects.linpro.no/mailman/listinfo/varnish-misc
>>
>
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