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I left it running for about 30 minutes. > > I pushed out the latest patches to queue/perf/pmu-unregister I'll spend some time to go through the changes. I ran fuzzer over the weekend with latest queue/perf/pmu-unregister and I saw this kernel crash: BUG: kernel NULL pointer dereference, address: 00000000000000d0 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 12a922067 P4D 0 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 8 UID: 1002 PID: 8505 Comm: perf_fuzzer Kdump: loaded Tainted: G W O 6.13.0-rc1-pmu-unregister+ #171 Tainted: [W]=WARN, [O]=OOT_MODULE Hardware name: AMD Corporation RUBY/RUBY, BIOS RRR1009C 07/21/2023 RIP: 0010:perf_mmap_to_page+0x6/0xc0 Code: ... RSP: 0018:ffa0000003aff910 EFLAGS: 00010206 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000008 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffa0000003aff980 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 00007b2b02ca8000 R14: ff1100014f9cc5c0 R15: 0000000000000009 FS: 00007b2b02e03740(0000) GS:ff11001009000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000000d0 CR3: 000000014f99c001 CR4: 0000000000f71ef0 PKRU: 55555554 Call Trace: ? show_regs+0x6c/0x80 ? __die+0x24/0x80 ? page_fault_oops+0x155/0x570 ? do_user_addr_fault+0x4b2/0x870 ? srso_alias_return_thunk+0x5/0xfbef5 ? get_page_from_freelist+0x3c7/0x1680 ? exc_page_fault+0x82/0x1b0 ? asm_exc_page_fault+0x27/0x30 ? perf_mmap_to_page+0x6/0xc0 ? perf_mmap+0x237/0x710 __mmap_region+0x6d5/0xb90 mmap_region+0x8d/0xc0 do_mmap+0x349/0x630 vm_mmap_pgoff+0xf4/0x1c0 ksys_mmap_pgoff+0x177/0x240 __x64_sys_mmap+0x33/0x70 x64_sys_call+0x24b9/0x2650 do_syscall_64+0x7e/0x170 ? srso_alias_return_thunk+0x5/0xfbef5 ? srso_alias_return_thunk+0x5/0xfbef5 ? sched_tick+0x119/0x320 ? srso_alias_return_thunk+0x5/0xfbef5 ? sysvec_irq_work+0x4f/0xc0 ? srso_alias_return_thunk+0x5/0xfbef5 ? rcu_report_qs_rnp+0xd1/0x140 ? srso_alias_return_thunk+0x5/0xfbef5 ? rcu_core+0x1c2/0x380 ? srso_alias_return_thunk+0x5/0xfbef5 ? rcu_core_si+0xe/0x20 ? srso_alias_return_thunk+0x5/0xfbef5 ? handle_softirqs+0xe7/0x330 ? srso_alias_return_thunk+0x5/0xfbef5 ? srso_alias_return_thunk+0x5/0xfbef5 ? irqentry_exit_to_user_mode+0x43/0x250 ? srso_alias_return_thunk+0x5/0xfbef5 ? irqentry_exit+0x43/0x50 ? srso_alias_return_thunk+0x5/0xfbef5 ? sysvec_apic_timer_interrupt+0x4f/0xc0 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7b2b02b2531c Code: ... RSP: 002b:00007ffc3b177880 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007b2b02b2531c RDX: 0000000000000003 RSI: 0000000000009000 RDI: 0000000000000000 RBP: 00007ffc3b177890 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000636a69c7bb60 R15: 00007b2b02e55000 Modules linked in: ... CR2: 00000000000000d0 ---[ end trace 0000000000000000 ]--- Thanks, Ravi