linux-kernel - Re: [tip:core/rcu] rcu: Consolidate sparse and lockdep declarations in include/linux/rcupdate.h

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Date:	Sun, 23 Aug 2009 20:42:02 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	mingo@...hat.com, hpa@...or.com, paulmck@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/rcu] rcu: Consolidate sparse and lockdep
	declarations in include/linux/rcupdate.h


* tip-bot for Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:

> Commit-ID:  bc33f24bdca8b6e97376e3a182ab69e6cdefa989
> Gitweb:     http://git.kernel.org/tip/bc33f24bdca8b6e97376e3a182ab69e6cdefa989
> Author:     Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> AuthorDate: Sat, 22 Aug 2009 13:56:47 -0700
> Committer:  Ingo Molnar <mingo@...e.hu>
> CommitDate: Sun, 23 Aug 2009 10:32:37 +0200
> 
> rcu: Consolidate sparse and lockdep declarations in include/linux/rcupdate.h

-tip testing found a spontaneous reboot crash, which i 
bisected back to this commit:

  bc33f24bdca8b6e97376e3a182ab69e6cdefa989 is first bad commit

the reboot happens during the ftrace syscall tracepoints 
self-test:

[   34.618832] Testing event sys_exit_set_robust_list: OK
[   34.635511] Testing event sys_enter_get_robust_list: OK
[   34.652164] Testing event sys_exit_get_robust_list: OK
[   34.668844] Testing event sys_enter_futex: OK
[   34.685495] Testing event sys_exit_futex: OK
[   34.702170] Testing event lock_acquire: [instant reboot]

There's no log message - just a reboot - which signals some 
severe crash - perhaps some locking related infinite 
recursion or something like that?

Config attached.

	Ingo

View attachment "config" of type "text/plain" (73495 bytes)