linux-kernel - [perf] fuzzer triggers unchecked MSR access error: WRMSR to 0x318

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Message-ID: <37881148-a43e-5fd4-817c-a875adc7a15f@maine.edu>
Date:   Wed, 28 Jul 2021 12:49:43 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     linux-kernel@...r.kernel.org
cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: [perf] fuzzer triggers unchecked MSR access error: WRMSR to 0x318

Hello

ther perf_fuzzer on current linux-git on a Haswell system triggers the 
following.

I've truncated the call chain, as it goes on for quite a while, let me 
know if you want/need more information.

Vince

[32694.087403] unchecked MSR access error: WRMSR to 0x318 (tried to write 0x0000000000000000) at rIP: 0xffffffff8106f854 (native_write_msr+0x4/0x20)
[32694.101374] Call Trace:
[32694.103974]  perf_clear_dirty_counters+0x86/0x100
[32694.109027]  switch_mm_irqs_off+0x1d0/0x430
[32694.113498]  __schedule+0x29f/0x1490
[32694.117300]  ? cr4_update_irqsoff+0x2a/0x30
[32694.121762]  ? switch_mm_irqs_off+0x1ba/0x430
[32694.126418]  ? rcu_eqs_exit.constprop.0+0x2e/0x60
[32694.131515]  ? cpuidle_enter_state+0xb7/0x350
[32694.136152]  schedule_idle+0x26/0x40
[32694.139974]  do_idle+0x16e/0x280
[32694.143421]  cpu_startup_entry+0x19/0x20
[32694.147643]  secondary_startup_64_no_verify+0xb0/0xbb
[32694.973583] Call Trace:
[32694.976215]  perf_clear_dirty_counters+0x86/0x100
[32694.981290]  switch_mm_irqs_off+0x1d0/0x430
[32694.985797]  __schedule+0x29f/0x1490
[32694.989664]  ? cr4_update_irqsoff+0x2a/0x30
[32694.994134]  ? switch_mm_irqs_off+0x1ba/0x430
[32694.998789]  ? rcu_eqs_exit.constprop.0+0x2e/0x60
[32695.003831]  ? cpuidle_enter_state+0xb7/0x350
[32695.008521]  schedule_idle+0x26/0x40
[32695.012362]  do_idle+0x16e/0x280
[32695.015838]  cpu_startup_entry+0x19/0x20
[32695.020041]  secondary_startup_64_no_verify+0xb0/0xbb
[32695.126530] Call Trace:
[32695.129184]  perf_clear_dirty_counters+0x86/0x100
[32695.134268]  switch_mm_irqs_off+0x1d0/0x430
[32695.138757]  __schedule+0x29f/0x1490
[32695.142577]  ? tick_nohz_get_sleep_length+0x6b/0xa0
[32695.147806]  ? rcu_eqs_exit.constprop.0+0x2e/0x60
[32695.152806]  ? cpuidle_enter_state+0xb7/0x350
[32695.157500]  schedule_idle+0x26/0x40
[32695.161342]  do_idle+0x16e/0x280
[32695.164798]  cpu_startup_entry+0x19/0x20
[32695.169010]  secondary_startup_64_no_verify+0xb0/0xbb