nginx crash

[MagicBear]

2011/11/13 Maxim Dounin <mdounin at mdounin.ru>:
> Hello!
>
> On Sat, Nov 12, 2011 at 10:07:22PM +0800, MagicBear wrote:
>
>> happen on a of main upstream server dead.
>>
>> Here is the config
>>
>> proxy_cache_path /dev/shm/cdn_cache_comment  levels=1:2
>> keys_zone=cache_comment_mem:32m max_size=128m;
>
> [...]
>
>>       proxy_read_timeout   60s;
>
> How long it takes for response to be removed from cache given
> "max_size=128m" and "keys_zones=" size constraints under your
> load?
>

may be several hours to several days.
I think i must be increase keys_zone size.

>> 2011/11/12 MagicBear <magicbearmo at gmail.com>:
>> > 2011/11/12 19:00:16 [alert] 7552#0: ignore long locked inactive cache
>> > entry 26b0312d67bd41ef132ce5b8a4445ffa, count:1
>> > 2011/11/12 19:02:17 [alert] 7552#0: ignore long locked inactive cache
>> > entry ac307ce9b33a01a04f4f17c187d9b11a, count:1
>> > 2011/11/12 19:02:45 [alert] 7552#0: ignore long locked inactive cache
>> > entry e5fa15e3f856238feb5e0b7128120e20, count:1
>> > 2011/11/12 19:03:59 [alert] 7552#0: ignore long locked inactive cache
>> > entry 1eb06fe015c489159f15b514bb333931, count:1
>> > 2011/11/12 19:04:46 [alert] 7552#0: ignore long locked inactive cache
>> > entry 5023f1eb7e74908ae75d6a7a57ac4dfd, count:2
>> > 2011/11/12 19:05:41 [alert] 7552#0: ignore long locked inactive cache
>> > entry 9fda125ea01601b6a32536afd2c59aa2, count:1
>> > 2011/11/12 19:06:02 [alert] 7547#0: worker process 7548 exited on
>> > signal 11 (core dumped)
>
> (Just in case: are there any other alerts before "ignore long
> locked inactive cache entry..." ones?)
>
> It looks like nginx decided to remove cache entry (assuming it was
> left locked by a previously died worker) while the entry was in
> fact locked due to nginx waiting for a backend timeout.
>
> Resulting segfault is somewhat expected with current code.  Looks
> like code needs some (more) safeguards against such situations.
>
> As a workaround, you may want to make sure talking to backend
> always takes less than expected cache entry lifetime, this will
> prevent such situations.
>

Ok, I will try this, thanks for your advises.

> Maxim Dounin
>
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-- 
MagicBear