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Date:   Thu, 11 Jun 2020 12:10:50 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     open list <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        cj.chengjian@...wei.com,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michel Lespinasse <walken@...gle.com>,
        lkft-triage@...ts.linaro.org,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: Perf: WARNING: arch/x86/entry/common.c:624 idtentry_exit_cond_rcu+0x92/0xc0

On Thu, Jun 11, 2020 at 11:56 AM Naresh Kamboju
<naresh.kamboju@...aro.org> wrote:
>
> While running perf test and selftest x86 single_step_syscall_32 on
> i386 kernel linux
> next 5.7.0-next-20200610 kernel warning noticed.
>
> steps to reproduce:
> --------------------------
> perf test
> and
> cd /opt/kselftests/default-in-kernel/x86
> ./single_step_syscall_32
>
> perf warning log:
> ----------------------
> [   57.260865] ------------[ cut here ]------------
> [   57.266576] IRQs not disabled as expected
> [   57.270583] WARNING: CPU: 1 PID: 500 at
> /usr/src/kernel/arch/x86/entry/common.c:624
> idtentry_exit_cond_rcu+0x92/0xc0
> [   57.281092] Modules linked in: x86_pkg_temp_thermal fuse
> [   57.286406] CPU: 1 PID: 500 Comm: perf Not tainted 5.7.0-next-20200610 #1
> [   57.293190] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> 2.2 05/23/2018
> [   57.300577] EIP: idtentry_exit_cond_rcu+0x92/0xc0
> [   57.305280] Code: 8b 89 d8 05 00 00 85 c9 74 ae 80 3d b1 64 2c d4
> 00 75 a5 68 94 2d fb d3 89 55 f8 89 45 fc c6 05 b1 64 2c d4 01 e8 8e
> f5 2b ff <0f> 0b 58 8b 55 f8 8b 45 fc eb 83 8d 76 00 e8 5b fd ff ff c9
> c3 89
> [   57.324017] EAX: 0000001d EBX: 0d00022a ECX: 00000027 EDX: f5b9e14c
> [   57.330274] ESI: f2a2ffb4 EDI: ffff0ff4 EBP: f2a2ff8c ESP: f2a2ff80
> [   57.336531] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010096
> [   57.343345] CR0: 80050033 CR2: 08700a58 CR3: 14ad7000 CR4: 003406d0
> [   57.349608] DR0: 080dfb80 DR1: 080dfc00 DR2: 08700a58 DR3: 00000000
> [   57.355866] DR6: fffe0ff0 DR7: 0d00062a
> [   57.359697] Call Trace:
> [   57.362143]  exc_debug+0x84/0x1b0
> [   57.365487]  ? exc_int3+0x1d0/0x1d0
> [   57.368981]  handle_exception+0x145/0x145
> [   57.372991] EIP: 0x80dfbcd
> [   57.375694] Code: Bad RIP value.
> [   57.378918] EAX: 00000000 EBX: 00000005 ECX: 00002400 EDX: 00000000
> [   57.385175] ESI: 00000003 EDI: 00000004 EBP: bfd59798 ESP: bfd59770
> [   57.391431] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000246
> [   57.398215] irq event stamp: 1896

A regrettable property of the current entry code structure is that we
lose any real indication of the vector.  Presumably this is #DB, hence
exc_debug.  I don't know what perf has to do with it.

I'll bang on this after lunch if no one beats me to it.

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