linux-kernel - Re: [PATCH 3.18 04/57] vm: add VM_FAULT

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Date:	Wed, 11 Feb 2015 11:43:07 +0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Konstantin Khlebnikov <koct9i@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Stable <stable@...r.kernel.org>,
	Jan Engelhardt <jengelh@...i.de>, linux-arch@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 3.18 04/57] vm: add VM_FAULT_SIGSEGV handling support

On Tue, Feb 10, 2015 at 12:22:41PM +0400, Konstantin Khlebnikov wrote:
> I've found regression:
> 
> [  257.139907] ================================================
> [  257.139909] [ BUG: lock held when returning to user space! ]
> [  257.139912] 3.18.6-debug+ #161 Tainted: G     U
> [  257.139914] ------------------------------------------------
> [  257.139916] python/22843 is leaving the kernel with locks still held!
> [  257.139918] 1 lock held by python/22843:
> [  257.139920]  #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff8104e4c2>]
> __do_page_fault+0x162/0x570
> 
> upstream commit 7fb08eca45270d0ae86e1ad9d39c40b7a55d0190 must be backported too.

Ah, nice, I missed that one.  How did you test this?

thanks,

greg k-h
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