linux-kernel - Re: [PATCH] perf: fix panic by disable ftrace on fault.c

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Date:   Tue, 14 Sep 2021 20:27:18 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     王贇 <yun.wang@...ux.alibaba.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        "open list:X86 MM" <linux-kernel@...r.kernel.org>,
        "open list:BPF (Safe dynamic programs and tools)" 
        <netdev@...r.kernel.org>,
        "open list:BPF (Safe dynamic programs and tools)" 
        <bpf@...r.kernel.org>
Subject: Re: [PATCH] perf: fix panic by disable ftrace on fault.c

On 9/14/21 6:56 PM, 王贇 wrote:
>>> [   44.134987][    C0]  ? __sanitizer_cov_trace_pc+0x7/0x60
>>> [   44.135005][    C0]  ? kcov_common_handle+0x30/0x30
>> Just turning off tracing for the page fault handler is papering over the
>> problem.  It'll just come back later with a slightly different form.
>>
> Cool~ please let me know when you have the proper approach.

It's an entertaining issue, but I wasn't planning on fixing it myself.