linux-kernel - [BUG] arm: kgdb: patch_text() in kgdb_arch_set

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Message-ID: <55C230C7.2000909@nvidia.com>
Date:	Wed, 5 Aug 2015 18:50:31 +0300
From:	Aapo Vienamo <avienamo@...dia.com>
To:	<dianders@...omium.org>, <keescook@...omium.org>, <nico@...aro.org>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: [BUG] arm: kgdb: patch_text() in kgdb_arch_set_breakpoint() may sleep

Hi,

The breakpoint setting code in arch/arm/kernel/kgdb.c calls
patch_text(), which ends up trying to sleep while in interrupt context.
The bug was introduced by commit: 23a4e40 arm: kgdb: Handle read-only
text / modules. The resulting behavior is "BUG: scheduling while
atomic..." when setting a breakpoint in kgdb. This was tested on an
Nvidia Jetson TK1 board with 4.2.0-rc5-next-20150805 kernel.

Regards,
Aapo Vienamo
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