linux-kernel - Re: WARNING: kernel stack regs has bad "bp" value

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Message-ID: <20241224065146.5ety7gme2tndv4dq@jpoimboe>
Date: Mon, 23 Dec 2024 22:51:46 -0800
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: wzs <wangzhengshu39@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>,
	Naresh Kamboju <naresh.kamboju@...aro.org>,
	linux-kernel@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, loongarch@...ts.linux.dev,
	linux-parisc@...r.kernel.org, x86@...nel.org
Subject: Re: WARNING: kernel stack regs has bad "bp" value

On Tue, Dec 24, 2024 at 11:17:30AM +0800, wzs wrote:
> The output of objdump -r --disassemble=vmw_send_msg vmwgfx.ko is as follows.
> Since the content is quite long ,i need to split two parts for saving.
> Similarly, I have also saved it in the attachment.
> console output 1 : https://pastebin.com/mBi6fTdM
> cousole output 2 : https://pastebin.com/89SMLgCy

Thanks, this seems to be caused by vmware_hypercall_hb_out()'s misuse of
the %rbp register.  Unfortunately there doesn't seem to be a fix for
that, as it looks like a hypervisor implementation detail.

The good news is it's probably nothing to worry about.  Regardless,
frame pointers aren't very useful anymore and I would recommend you
enable the CONFIG_UNWINDER_ORC option.

-- 
Josh