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From: 王贇 <yun.wang@linux.alibaba.com>
To: Dave Hansen <dave.hansen@intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
"open list:X86 MM" <linux-kernel@vger.kernel.org>,
"open list:BPF (Safe dynamic programs and tools)"
<netdev@vger.kernel.org>,
"open list:BPF (Safe dynamic programs and tools)"
<bpf@vger.kernel.org>
Subject: Re: [PATCH] perf: fix panic by disable ftrace on fault.c
Date: Wed, 15 Sep 2021 15:34:20 +0800 [thread overview]
Message-ID: <09d0190b-f2cc-9e64-4d3a-4eb0def22b7b@linux.alibaba.com> (raw)
In-Reply-To: <ac31b8c7-122e-3467-566b-54f053ca0ae2@linux.alibaba.com>
On 2021/9/15 下午3:22, 王贇 wrote:
>
>
> On 2021/9/15 上午11:27, Dave Hansen wrote:
>> 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.
>>
>
> Do you have any suggestion on how should we fix the problem?
>
> I'd like to help fix it, but sounds like all the known working approach
> are not acceptable...
Hi, Dave, Peter
What if we just increase the stack size when ftrace enabled?
Maybe like:
diff --git a/arch/x86/include/asm/page_64_types.h b/arch/x86/include/asm/page_64_types.h
index a8d4ad85..bc2e0c1 100644
--- a/arch/x86/include/asm/page_64_types.h
+++ b/arch/x86/include/asm/page_64_types.h
@@ -12,10 +12,16 @@
#define KASAN_STACK_ORDER 0
#endif
+#ifdef CONFIG_FUNCTION_TRACER
+#define FTRACE_STACK_ORDER 1
+#else
+#define FTRACE_STACK_ORDER 0
+#endif
+
#define THREAD_SIZE_ORDER (2 + KASAN_STACK_ORDER)
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
-#define EXCEPTION_STACK_ORDER (0 + KASAN_STACK_ORDER)
+#define EXCEPTION_STACK_ORDER (0 + KASAN_STACK_ORDER + FTRACE_STACK_ORDER)
#define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
#define IRQ_STACK_ORDER (2 + KASAN_STACK_ORDER)
Just like kasan we give more stack space for ftrace, is this looks
acceptable to you?
Regards,
Michael Wang
>
> Regards,
> Michael Wang
>
next prev parent reply other threads:[~2021-09-15 7:34 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-09 3:13 [RFC PATCH] perf: fix panic by mark recursion inside perf_log_throttle 王贇
2021-09-09 6:10 ` 王贇
2021-09-10 15:38 ` Peter Zijlstra
2021-09-13 3:00 ` 王贇
2021-09-13 3:21 ` 王贇
2021-09-13 10:24 ` Peter Zijlstra
2021-09-13 10:36 ` Peter Zijlstra
2021-09-14 2:02 ` 王贇
2021-09-14 1:58 ` 王贇
2021-09-14 10:28 ` Peter Zijlstra
2021-09-15 1:51 ` 王贇
2021-09-15 15:17 ` [PATCH] x86/dumpstack/64: Add guard pages to stack_info Peter Zijlstra
2021-09-16 3:34 ` 王贇
2021-09-16 3:47 ` 王贇
2021-09-16 8:00 ` Peter Zijlstra
2021-09-16 8:03 ` Peter Zijlstra
2021-09-16 10:02 ` Peter Zijlstra
2021-09-17 2:15 ` 王贇
2021-09-17 3:02 ` 王贇
2021-09-17 10:21 ` Peter Zijlstra
2021-09-17 16:40 ` Peter Zijlstra
2021-09-18 2:30 ` 王贇
2021-09-18 6:56 ` Peter Zijlstra
2021-09-18 2:38 ` 王贇
2021-09-13 3:30 ` [PATCH] perf: fix panic by disable ftrace on fault.c 王贇
2021-09-13 14:49 ` Dave Hansen
2021-09-14 1:52 ` 王贇
2021-09-14 3:02 ` 王贇
2021-09-14 7:23 ` 王贇
2021-09-14 16:16 ` Dave Hansen
2021-09-15 1:56 ` 王贇
2021-09-15 3:27 ` Dave Hansen
2021-09-15 7:22 ` 王贇
2021-09-15 7:34 ` 王贇 [this message]
2021-09-15 15:19 ` [PATCH] x86: Increase exception stack sizes Peter Zijlstra
2021-09-16 3:42 ` 王贇
2021-09-21 7:28 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2021-09-21 12:41 ` tip-bot2 for Peter Zijlstra
2021-09-14 2:08 ` [PATCH] perf: fix panic by disable ftrace on fault.c 王贇
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