[Mongrel] Mongrel hangs in production. gdb stack included

Joey Geiger jgeiger at gmail.com
Wed Apr 30 10:51:37 EDT 2008


Are you rotating your log files?

Might want to google "mongrel log rotate hang" as I believe there have
been some issues brought up here in the past.


On Wed, Apr 30, 2008 at 8:28 AM, Erik Morton <eimorton at gmail.com> wrote:
> It happens at night usually so I haven't had a chance to run show innodb
> status yet. I will say that once when it happened show processlist still
> showed all of the expected connections.
>
>  I have no large hooks. Just a call to MyObject.find(:all, :include =>
> :parent) that generates an SQL statement approximately 2,000-3,000
> characters long. My max_packet is set to 16mb
>
>  Erik
>
>
>  On Apr 30, 2008, at 8:50 AM, Dave Cheney wrote:
>
> > What does
> > mysql> show innodb status\G
> > mysql> show processlist;
> >
> > show during the hang, it may be a deadlock in the db. We had similar
> problems with large after_save hooks that would deadlock updating multiple
> tables.
> >
> > Cheers
> >
> > Dave
> >
> > On 30/04/2008, at 12:31 PM, Erik Morton wrote:
> >
> >
> > > I am getting hanging Mongrels daily under light volume.
> > >
> > > Mongrel Web Server 1.1.4
> > > Apache 2.2 w/mod_proxy
> > > RedHat EL4 2.6.9-5.ELsmp #1 SMP Wed Jan 5 19:30:39 EST 2005 i686 i686
> i386 GNU/Linux
> > > ruby 1.8.5 (2006-08-25) [i686-linux]
> > > fastthread (1.0.1)
> > > Mysql 5.0.45
> > >
> > > The mongrels are hanging with 0% CPU, their database connections are
> still being reported as open by mysql. Attaching gdb to the processes yields
> similar results (included below). I have no idea about what the next steps
> are in figuring out what is going on -- short of upgrading to ruby 1.8.6!
> > >
> > > Help and pointers are much appreciated.
> > >
> > > (gdb) whe
> > > #0  0x0058b7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
> > > #1  0x0065ec93 in __read_nocancel () from /lib/tls/libc.so.6
> > > #2  0x04ccc27f in vio_read (vio=0xfffffe00, buf=0xfffffe00 <Address
> 0xfffffe00 out of bounds>, size=-512) at viosocket.c:44
> > > #3  0x04ccc356 in vio_read_buff (vio=0x9088ae0,
> > >  buf=0xb5d471df "e Travel Plaza, located on I-90 eastbound between
> Interchanges 48A (Pembroke) and 48 (Batavia), at milepost 397. The
> renovation projects scheduled at Ulster and Pembroke travel plazas, in
> addition to "..., size=4412) at viosocket.c:95
> > > #4  0x04ccd8f6 in my_real_read (net=0x913eb10, complen=0xbfed5e98) at
> net.c:804
> > > #5  0x04ccdc30 in my_net_read (net=0x913eb10) at net.c:978
> > > #6  0x04cc6b78 in net_safe_read (mysql=0x913eb10) at client.c:596
> > > #7  0x04cc792f in cli_read_rows (mysql=0x913eb10,
> mysql_fields=0xad6e1a0, fields=59) at client.c:1343
> > > #8  0x04cc9881 in mysql_store_result (mysql=0x913eb10) at client.c:2697
> > > #9  0x04ca299f in store_result (obj=3076071240) at mysql.c:677
> > > #10 0x0805bcb4 in rb_call0 (klass=3076091220, recv=3076071240, id=27825,
> oid=4294966784, argc=1, argv=0xbfed6160, body=0xb7596458, flags=0) at
> eval.c:5665
> > > #11 0x0805c017 in rb_call (klass=3076091220, recv=3076071240, mid=27825,
> argc=1, argv=0xbfed6160, scope=0) at eval.c:6048
> > > #12 0x08058127 in rb_eval (self=3076059900, n=0x113c) at ruby.h:654
> > > #13 0x0805d99b in rb_yield_0 (val=6, self=3076059900, klass=0, flags=0,
> avalue=0) at eval.c:4987
> > > #14 0x08058475 in rb_eval (self=3076059900, n=0x113c) at eval.c:3248
> > > #15 0x08058952 in rb_eval (self=3076059900, n=0x113c) at eval.c:3624
> > > #16 0x0805d99b in rb_yield_0 (val=6, self=3076059900, klass=0, flags=0,
> avalue=0) at eval.c:4987
> > > #17 0x08058475 in rb_eval (self=3082341360, n=0x113c) at eval.c:3248
> > > #18 0x0805b9ce in rb_call0 (klass=3082341260, recv=3082341360, id=53385,
> oid=4294966784, argc=0, argv=0x0, body=0xb7b931f8, flags=0) at eval.c:5954
> > > #19 0x0805c017 in rb_call (klass=3082341260, recv=3082341360, mid=53385,
> argc=0, argv=0x0, scope=0) at eval.c:6048
> > > #20 0x08058127 in rb_eval (self=3082341360, n=0x113c) at ruby.h:654
> > >
> > >
> > > (gdb) whe
> > > #0  0x0058b7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
> > > #1  0x0065ec93 in __read_nocancel () from /lib/tls/libc.so.6
> > > #2  0x01d6d27f in vio_read (vio=0xfffffe00, buf=0xfffffe00 <Address
> 0xfffffe00 out of bounds>, size=-512) at viosocket.c:44
> > > #3  0x01d6d356 in vio_read_buff (vio=0x93e7c30,
> > >  buf=0xb6f00db4
> "~\202\215^-?\213\201?QJ\237\203\201\230D?\232V\201M8\233\224?\201\021-o\217[\200?#?\211\236\200?\203??0\213\021wC?h\211\236j\234?\215\210F]̣\232\207\006Q\b\236\220\205?Dv\231t\204?8\220\224
> \203?-\214\216\236\202?$\026\210?\201?\203Y?u\221?v???\217?jS??\215?]\206??\213?P?\235?\212\023DS\230?\210 at 8\210\223d\206o-?\215?\204?$R\210z\202?\203\017??\230\236v??\026\226",
> size=503704)
> > >  at viosocket.c:95
> > > #4  0x01d6e8f6 in my_real_read (net=0x93e71a8, complen=0xbff9efa8) at
> net.c:804
> > > #5  0x01d6ec30 in my_net_read (net=0x93e71a8) at net.c:978
> > > #6  0x01d67b78 in net_safe_read (mysql=0x93e71a8) at client.c:596
> > > #7  0x01d6892f in cli_read_rows (mysql=0x93e71a8,
> mysql_fields=0xaec8f00, fields=51) at client.c:1343
> > > #8  0x01d6a881 in mysql_store_result (mysql=0x93e71a8) at client.c:2697
> > > #9  0x01d4399f in store_result (obj=3071130920) at mysql.c:677
> > > #10 0x0805bcb4 in rb_call0 (klass=3071150400, recv=3071130920, id=27825,
> oid=4294966784, argc=1, argv=0xbff9f270, body=0xb70e0058, flags=0) at
> eval.c:5665
> > > #11 0x0805c017 in rb_call (klass=3071150400, recv=3071130920, mid=27825,
> argc=1, argv=0xbff9f270, scope=0) at eval.c:6048
> > > #12 0x08058127 in rb_eval (self=3071126200, n=0x7af98) at ruby.h:654
> > >
> > > _______________________________________________
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> > >
> >
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> >
>
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