Re: ps -ax hang with Mozilla in 2.4.9

Re: ps -ax hang with Mozilla in 2.4.9

[Manfred Spraul]

 
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> 
> > > Just wondering if anybody has had moz hanging on them and hanging
> > > 'ps -ax'
> > > (which means /proc/kmem reading is hung, IIRC)?
> >
> > Modern Linux "ps" does not use /proc/kmem. Do a "strace ps" to see.
> > Maybe /proc/12345/stat or /proc/12345/status is hanging.
> 
> Thanks; if I can get this to be reproduced again I'll try. If read() on
> stat or status is hanging, something is very wrong, though, right?

Probably you ran into the bug Ulrich Weigand found:
access_process_vm can deadlock, especially with multithreaded apps.
Access_process_vm is used by /proc/*/cmdline.

It's fixed in 2.4.10.

--
	Manfred

Re: ps -ax hang with Mozilla in 2.4.9

[Christian Robottom Reis]

On Tue, 18 Sep 2001, Albert D. Cahalan wrote:

> > Just wondering if anybody has had moz hanging on them and hanging 'ps -ax'
> > (which means /proc/kmem reading is hung, IIRC)?
>
> Modern Linux "ps" does not use /proc/kmem. Do a "strace ps" to see.
> Maybe /proc/12345/stat or /proc/12345/status is hanging.

Thanks; if I can get this to be reproduced again I'll try. If read() on
stat or status is hanging, something is very wrong, though, right?

Take care,
--
Christian Reis, Senior Engineer, Async Open Source, Brazil.
http://async.com.br/~kiko/ | [+55 16] 272 3330 | NMFL

ps -ax hang with Mozilla in 2.4.9

[Christian Robottom Reis]

Hi there,

Just wondering if anybody has had moz hanging on them and hanging 'ps -ax'
(which means /proc/kmem reading is hung, IIRC)? This _never_ happened
before 2.4.9, and I do mozilla QA so I'd have seen it; i've seen all sorts
of crash with it :)

How can I debug this properly?

What were the changes that were reported in 2.4.9 that made mozilla
"better", exactly? I only see this happening with mozilla, but there may
be others. Let me know.

Take care,
--
Christian Reis, Senior Engineer, Async Open Source, Brazil.
http://async.com.br/~kiko/ | [+55 16] 272 3330 | NMFL