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From Stefan Eissing <stefan.eiss...@greenbytes.de>
Subject Re: mod_http2 and Frequent wake-ups for mpm_event
Date Sat, 21 Jan 2017 16:03:28 GMT
Stefan,

made a release at https://github.com/icing/mod_h2/releases/tag/v1.8.9 with all patches and
improved (hopefully) on them a bit. If you dare to drop that into your installation, that'd
be great.

Cheers,

Stefan

> Am 21.01.2017 um 15:25 schrieb Stefan Priebe <s.priebe@profihost.ag>:
> 
> and i got another crash here:
> 
> 2346 static void run_cleanups(cleanup_t **cref)
> 2347 {
> 2348     cleanup_t *c = *cref;
> 2349
> 2350     while (c) {
> 2351         *cref = c->next;
> 2352         (*c->plain_cleanup_fn)((void *)c->data);   <== here
> 2353         c = *cref;
> 2354
> 
> which looks similar to the other crash.
> 
> #0  0x00007fe4bbd33e1b in run_cleanups (cref=<optimized out>) at memory/unix/apr_pools.c:2352
> #1  apr_pool_clear (pool=0x7fe4a804dac8) at memory/unix/apr_pools.c:772
> #2  0x00000000004feb38 in ap_push_pool (queue_info=0x6d616e79642d3733, pool_to_recycle=0x2)
at fdqueue.c:234
> #3  0x00000000004fa8d8 in process_lingering_close (cs=0x7fe4a804dd58, pfd=0x25d3f98)
at event.c:1439
> 
> Details:
> (gdb) print c
> $1 = (cleanup_t *) 0x7fe4a804e9f0
> (gdb) print *c
> $2 = {next = 0x7fe4a804e870, data = 0x6d616e79642d3733, plain_cleanup_fn = 0x392d3734322e6369,
>  child_cleanup_fn = 0x617465722e722d35}
> (gdb) print *c->data
> Attempt to dereference a generic pointer.
> (gdb) print *c->plain_cleanup_fn
> Cannot access memory at address 0x392d3734322e6369
> (gdb)
> 
> Stefan
> 
> Am 21.01.2017 um 15:18 schrieb Stefan Priebe:
>> Hi,
>> 
>> #0  apr_pool_cleanup_kill (p=0x7fe4a8072358,
>> data=data@entry=0x7fe4a80723e0,
>>    cleanup_fn=cleanup_fn@entry=0x7fe4bbd38a40 <socket_cleanup>) at
>> memory/unix/apr_pools.c:2276
>> 
>> it crashes here in apr:
>> 2276         if (c->data == data && c->plain_cleanup_fn == cleanup_fn)
{
>> 
>> some lines before c becomes this
>> 2264     c = p->cleanups;
>> 
>> p is:
>> (gdb) print *p
>> $1 = {parent = 0x256f138, child = 0x7fe46c0751c8, sibling =
>> 0x7fe4a8096888, ref = 0x7fe4a8069fe8, cleanups = 0x7fe478159748,
>>  free_cleanups = 0x7fe478159788, allocator = 0x7fe4a803b490,
>> subprocesses = 0x0, abort_fn = 0x43da00 <abort_on_oom>,
>>  user_data = 0x0, tag = 0x502285 "transaction", active =
>> 0x7fe478158d70, self = 0x7fe4a8072330,
>>  self_first_avail = 0x7fe4a80723d0 "X#\a\250\344\177", pre_cleanups =
>> 0x7fe4a8072ab8}
>> 
>> wouldn't the error mean that p->cleanups is NULL?
>> 
>> (gdb) print *p->cleanups
>> $2 = {next = 0x7fe478159628, data = 0x7fe478159648, plain_cleanup_fn =
>> 0x7fe4bbd2ffd0 <apr_unix_file_cleanup>,
>>  child_cleanup_fn = 0x7fe4bbd2ff70 <apr_unix_child_file_cleanup>}
>> 
>> So p->cleanups->data is 0x7fe478159648 and data is 0x7fe4a80723e0?
>> 
>> I don't get why it's segfaulting
>> 
>> Stefan
>> Am 21.01.2017 um 09:50 schrieb Yann Ylavic:
>>> Hi Stefan,
>>> 
>>> On Sat, Jan 21, 2017 at 9:45 AM, Stefan Priebe <s.priebe@profihost.ag>
>>> wrote:
>>>> 
>>>> after running the whole night. These are the only ones still happening.
>>>> Should i revert the mpm patch to check whether it's the source?
>>> 
>>> Yes please, we need to determine...
>>> 
>>> Thanks,
>>> Yann.
>>> 

Stefan Eissing

<green/>bytes GmbH
Hafenstrasse 16
48155 M√ľnster
www.greenbytes.de


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