Re: After reload, nginx's CPU usage jumped to 100 percent（backtrace provided)

[杨镭]

Hi,

we reproduced the problem and below is the content of fcn:

(gdb) p *fcn
$1 = {node = {key = 2417939894599905030, left = 0x2b822d64f780, right =
0x2b822ada9a00, parent = 0x2b822bac7080, color = 0 '\000',
    data = 0 '\000'}, queue = {prev = 0x2b822afd63a8, next =
0x2b822ad45040}, key = "\177\215\220\215h!?T", count = 1, uses = 1,
  valid_msec = 0, error = 0, exists = 1, updating = 0, deleting = 1, uniq =
7209021, expire = 1311055359, valid_sec = 0,
  body_start = 905, fs_size = 2}
(gdb)

So I guess we should apply the patch?


On Wed, Jul 13, 2011 at 4:20 PM, 杨镭 <clanherb at gmail.com> wrote:

> Hi,
>
> we didn't take core dump. If we can reproduce the problem, I'll bring you
> the p *fcn content.
>
>
> On Tue, Jul 12, 2011 at 10:08 PM, Maxim Dounin <mdounin at mdounin.ru> wrote:
>
>> Hello!
>>
>> On Tue, Jul 12, 2011 at 09:31:07PM +0800, 杨镭 wrote:
>>
>> > After reload, all the worker processes, including newly forked ones,
>> goes
>> > straight to 100% CPU:
>>
>> [...]
>>
>> > Also, we took backtrace for cache manger process:
>> >
>> >
>> > Attaching to process 17306
>> > ngx_http_file_cache_expire (data=<value optimized out>) at
>> > src/http/ngx_http_file_cache.c:1096
>> > 1096            if (fcn->count == 0) {
>> > (gdb) bt
>> > #0  ngx_http_file_cache_expire (data=<value optimized out>) at
>> > src/http/ngx_http_file_cache.c:1096
>>
>> Could you please show
>>
>> p *fcn
>>
>> ?
>>
>> I think I see the problem, but just to make sure.
>>
>> If you are able to reproduce the problem please try the following
>> patch:
>>
>> diff --git a/src/http/ngx_http_file_cache.c
>> b/src/http/ngx_http_file_cache.c
>> --- a/src/http/ngx_http_file_cache.c
>> +++ b/src/http/ngx_http_file_cache.c
>> @@ -1099,7 +1099,8 @@ ngx_http_file_cache_expire(ngx_http_file
>>         }
>>
>>         if (fcn->deleting) {
>> -            continue;
>> +            wait = 1;
>> +            break;
>>         }
>>
>>         p = ngx_hex_dump(key, (u_char *) &fcn->node.key,
>>
>>
>> Maxim Dounin
>>
>> _______________________________________________
>> nginx mailing list
>> nginx at nginx.org
>> http://nginx.org/mailman/listinfo/nginx
>>
>
>
>
> --
> lei yang
>



-- 
lei yang
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