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Re: futex_wake_op deadlock?

To: Kaz Kylheku <kaz@zeugmasystems.com>
Subject: Re: futex_wake_op deadlock?
From: Ralf Baechle <ralf@linux-mips.org>
Date: Mon, 19 Nov 2007 18:48:37 +0000
Cc: linux-mips@linux-mips.org
In-reply-to: <DDFD17CC94A9BD49A82147DDF7D545C54DCBD2@exchange.ZeugmaSystems.local>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <DDFD17CC94A9BD49A82147DDF7D545C54DCBD2@exchange.ZeugmaSystems.local>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.17 (2007-11-01)
On Fri, Nov 16, 2007 at 03:52:47PM -0800, Kaz Kylheku wrote:

> From time to time, on 2.6.17.7, I see a deadlock situation go off. The
> soft lockup tick occurs in the middle of do_futex, which is heavily
> inlined.  The system is actually hosed; it's not one of those
> recoverable CPU busy situations that can sometimes trigger the lockup
> detector.

Can you reproduce thing hang also if you're not running in a binary compat
mode, that is either running o32 binaries on a 32-bit kernel or 64-bit
binaries on a 64-bit kernel?

  Ralf

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