[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20160209145426.GR22874@arm.com>
Date: Tue, 9 Feb 2016 14:54:26 +0000
From: Will Deacon <will.deacon@....com>
To: Yang Shi <yang.shi@...aro.org>
Cc: rostedt@...dmis.org, catalin.marinas@....com,
bigeasy@...utronix.de, linux-kernel@...r.kernel.org,
linux-rt-users@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH] arm64: replace read_lock to rcu lock in call_step_hook
On Mon, Feb 08, 2016 at 02:49:24PM -0800, Yang Shi wrote:
> BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:917
> in_atomic(): 1, irqs_disabled(): 128, pid: 383, name: sh
> Preemption disabled at:[<ffff800000124c18>] kgdb_cpu_enter+0x158/0x6b8
>
> CPU: 3 PID: 383 Comm: sh Tainted: G W 4.1.13-rt13 #2
> Hardware name: Freescale Layerscape 2085a RDB Board (DT)
> Call trace:
> [<ffff8000000885e8>] dump_backtrace+0x0/0x128
> [<ffff800000088734>] show_stack+0x24/0x30
> [<ffff80000079a7c4>] dump_stack+0x80/0xa0
> [<ffff8000000bd324>] ___might_sleep+0x18c/0x1a0
> [<ffff8000007a20ac>] __rt_spin_lock+0x2c/0x40
> [<ffff8000007a2268>] rt_read_lock+0x40/0x58
> [<ffff800000085328>] single_step_handler+0x38/0xd8
> [<ffff800000082368>] do_debug_exception+0x58/0xb8
> Exception stack(0xffff80834a1e7c80 to 0xffff80834a1e7da0)
> 7c80: ffffff9c ffffffff 92c23ba0 0000ffff 4a1e7e40 ffff8083 001bfcc4 ffff8000
> 7ca0: f2000400 00000000 00000000 00000000 4a1e7d80 ffff8083 0049501c ffff8000
> 7cc0: 00005402 00000000 00aaa210 ffff8000 4a1e7ea0 ffff8083 000833f4 ffff8000
> 7ce0: ffffff9c ffffffff 92c23ba0 0000ffff 4a1e7ea0 ffff8083 001bfcc0 ffff8000
> 7d00: 4a0fc400 ffff8083 00005402 00000000 4a1e7d40 ffff8083 00490324 ffff8000
> 7d20: ffffff9c 00000000 92c23ba0 0000ffff 000a0000 00000000 00000000 00000000
> 7d40: 00000008 00000000 00080000 00000000 92c23b8b 0000ffff 92c23b8e 0000ffff
> 7d60: 00000038 00000000 00001cb2 00000000 00000005 00000000 92d7b498 0000ffff
> 7d80: 01010101 01010101 92be9000 0000ffff 00000000 00000000 00000030 00000000
> [<ffff8000000833f4>] el1_dbg+0x18/0x6c
>
> This issue is similar with 62c6c61("arm64: replace read_lock to rcu lock in
> call_break_hook"), but comes to single_step_handler.
>
> This also solves kgdbts boot test silent hang issue on 4.4 -rt kernel.
>
> Signed-off-by: Yang Shi <yang.shi@...aro.org>
Acked-by: Will Deacon <will.deacon@....com>
Will
Powered by blists - more mailing lists