linux-kernel - Re: 4879b7ae05 ("Merge tag 'dmaengine-4.12-rc1' of .."): WARNING: kernel stack regs at bd92bc2e in 01-cpu-hotplug:3811 has bad 'bp' value 000001be

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Message-ID: <20171002213109.5n3skzy76edhwkvf@treble>
Date:   Mon, 2 Oct 2017 16:31:09 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     kernel test robot <fengguang.wu@...el.com>, LKP <lkp@...org>,
        linux-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        dma <dmaengine@...r.kernel.org>,
        linux-samsung-soc@...r.kernel.org,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>,
        Vinod Koul <vinod.koul@...el.com>,
        LKML <linux-kernel@...r.kernel.org>, wfg@...ux.intel.com
Subject: Re: 4879b7ae05 ("Merge tag 'dmaengine-4.12-rc1' of .."): WARNING:
 kernel stack regs at bd92bc2e in 01-cpu-hotplug:3811 has bad 'bp' value
 000001be

On Mon, Oct 02, 2017 at 04:26:54PM -0500, Josh Poimboeuf wrote:
> Fengguang, assuming it's reliably recreatable, any chance you could
> recreate with the following patch?

Sorry, here's a version which actually compiles.

diff --git a/arch/x86/kernel/unwind_frame.c b/arch/x86/kernel/unwind_frame.c
index d145a0b1f529..00234fa5a33a 100644
--- a/arch/x86/kernel/unwind_frame.c
+++ b/arch/x86/kernel/unwind_frame.c
@@ -44,7 +44,8 @@ static void unwind_dump(struct unwind_state *state)
 			state->stack_info.type, state->stack_info.next_sp,
 			state->stack_mask, state->graph_idx);
 
-	for (sp = state->orig_sp; sp; sp = PTR_ALIGN(stack_info.next_sp, sizeof(long))) {
+	for (sp = PTR_ALIGN(state->orig_sp, sizeof(long)); sp;
+	     sp = PTR_ALIGN(stack_info.next_sp, sizeof(long))) {
 		if (get_stack_info(sp, state->task, &stack_info, &visit_mask))
 			break;