Date: Tue, 30 Nov 2004 22:46:56 +0300
From: "Andrey J. Melnikoff (TEMHOTA)" <temnota@kmv.ru>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Cc: Willy Tarreau <willy@w.ods.org>, linux-kernel@vger.kernel.org
Subject: [RESOLVED] Re: [2.4.28-rc1] process stuck in release_task() call
Message-ID: <20041130194656.GA24188@kmv.ru>
References: <20041109162445.GM24130@kmv.ru> <20041110185813.GD12867@logos.cnet> <20041111083312.GE783@alpha.home.local> <20041111080102.GB15278@logos.cnet> <20041112135942.GW24130@kmv.ru> <20041116100639.GA11948@logos.cnet>
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Hello Marcelo, Willy!
 On Tue, Nov 16, 2004 at 08:06:42AM -0200, Marcelo Tosatti wrote next:

> On Fri, Nov 12, 2004 at 04:59:42PM +0300, Andrey J. Melnikoff (TEMHOTA) wrote:
> Andrey,
> 
> I do not have much of a clue of what is going on here.
show_trace() has made a fool of me and I started to ask silly questions :)
 
> Can you try 2.4.27 please?
Ok, i'm tested 2.4.25 - same result. But this is complete userland problem.

There two problem:

First - show_trace() give incorrect traces. it strat unwind stack from
address in `tsk->thread.esp', but it should use address saved in `regs->ebp'
- this make more accuracy stack trace.

Second - strange libpthreads problem. 
libpthreads always install own sa_restorer helper, and when first signal
arrived - call signal handler and if (when process in signal handler)
arrived new signal - lipthreads start play with rt_sigprocmask() and
rt_sigsuspend() syscalls inside own sa_restorer helper. 
woops - infinity loop inside libpthreads.

-- 
 Best regards, TEMHOTA-RIPN aka MJA13-RIPE
 System Administrator. mailto:temnota@kmv.ru

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