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[130.111.218.23]) by smtp.gmail.com with ESMTPSA id ay37-20020a05620a17a500b006af0d99c7fesm23161081qkb.132.2022.07.08.09.13.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 Jul 2022 09:13:47 -0700 (PDT) From: Vince Weaver X-Google-Original-From: Vince Weaver Date: Fri, 8 Jul 2022 12:13:43 -0400 (EDT) To: Kan Liang cc: linux-kernel@vger.kernel.org, Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim Subject: Re: [perf] unchecked MSR access error: WRMSR to 0x689 in intel_pmu_lbr_restore In-Reply-To: <66961a7d-a6d8-2536-9ed3-68c2e7f4e03d@maine.edu> Message-ID: References: <66961a7d-a6d8-2536-9ed3-68c2e7f4e03d@maine.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 6 Jul 2022, Vince Weaver wrote: > Let the fuzzer running a long time on 5.19-rc1 and after a few weeks it > triggered this weird trace. It is repeatable (although I haven't > narrowed down exactly what's causing it). > > It's odd in that it just dumps a , it doesn't provide any info on > what the actual trigger is. > > This is on a Haswell machine. I bumped up to current git and managed to trigger this again, this time it actually managed to print the error message. [ 7763.384369] unchecked MSR access error: WRMSR to 0x689 (tried to write 0x1fffffff8101349e) at rIP: 0xffffffff810704a4 (native_write_msr+0x4/0x20) [ 7763.397420] Call Trace: [ 7763.399881] [ 7763.401994] intel_pmu_lbr_restore+0x9a/0x1f0 [ 7763.406363] intel_pmu_lbr_sched_task+0x91/0x1c0 [ 7763.410992] __perf_event_task_sched_in+0x1cd/0x240 [ 7763.415879] ? __perf_event_task_sched_out+0x75/0x5c0 [ 7763.420939] finish_task_switch.isra.0+0x15b/0x2a0 [ 7763.425740] ? __switch_to+0x112/0x430 [ 7763.429503] __schedule+0x2cf/0x10d0 [ 7763.433088] ? send_signal_locked+0xc8/0x130 [ 7763.437364] schedule+0x4e/0xb0 [ 7763.440518] do_wait+0x15b/0x2f0 [ 7763.443757] kernel_wait4+0xa6/0x140 [ 7763.447337] ? thread_group_exited+0x60/0x60 [ 7763.451608] do_syscall_64+0x3b/0xc0 [ 7763.455199] entry_SYSCALL_64_after_hwframe+0x46/0xb0 [ 7763.460259] RIP: 0033:0x7f9063feba26 [ 7763.463838] Code: ff e9 0e 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 90 48 83 ec 28 89 54 24 14 48 89 74 24 [ 7763.482587] RSP: 002b:00007ffca3875c08 EFLAGS: 00000246 ORIG_RAX: 000000000000003d [ 7763.490161] RAX: ffffffffffffffda RBX: 000000000000000c RCX: 00007f9063feba26 [ 7763.497303] RDX: 0000000000000000 RSI: 00007ffca3875c1c RDI: 0000000000002214 [ 7763.504441] RBP: 00007ffca3875c20 R08: 00007f90640f321c R09: 00007f90640f3240 [ 7763.511577] R10: 0000000000000000 R11: 0000000000000246 R12: 000055d6ce93c4f0 [ 7763.518718] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 7763.525850]