linux-kernel - Re: [signal:execve2] BUG: sleeping function called from sys

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Message-ID: <20120803100305.GC23464@ZenIV.linux.org.uk>
Date:	Fri, 3 Aug 2012 11:03:06 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [signal:execve2] BUG: sleeping function called from sys_brk

On Fri, Aug 03, 2012 at 05:30:28PM +0800, Fengguang Wu wrote:
> Hi Al,
> 
> > I got a boot warning on commit
> > 
> > tree:   git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal.git execve2
> > head:   1ade99215ed3c334a544b9e1773602ff0f0251ab
> > commit: 1ade99215ed3c334a544b9e1773602ff0f0251ab [9/9] x86: switch to generic sys_execve and kernel_execve
> 
> The same commit triggers other warnings (new config and dmesg attached):
> 
> [   18.315125] debug: unmapping init [mem 0x816b6000-0x81852fff]
> [   18.318178] BUG: sleeping function called from invalid context at /c/kernel-tests/src/stable/kernel/rwsem.c:47
> [   18.318243] in_atomic(): 0, irqs_disabled(): 1, pid: 1, name: init
> [   18.318243] no locks held by init/1.
> [   18.318243] Pid: 1, comm: init Not tainted 3.5.0-01258-g1ade992 #182
> [   18.318243] Call Trace:
> [   18.318243]  [<8109e07d>] __might_sleep+0x13d/0x170
> [   18.318243]  [<813cea7c>] down_write+0x2c/0xd0
> [   18.318243]  [<81166ae9>] sys_brk+0x29/0x1f0
> [   18.318243]  [<813d22d0>] syscall_call+0x7/0xb

Ow...  I think I understand what happened here, and I really don't like the
picture ;-/  Could you check if slapping regs->flags = X86_EFLAGS_IF;
in process_32.c:start__thread() gets rid of that?
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