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> bool detach_rest = false; > > + /* FIXIES vs perf_pmu_unregister() */ > if (event->pmu->event_unmapped) > event->pmu->event_unmapped(event, vma->vm_mm); I assume you are already aware of the race between __pmu_detach_event() and perf_mmap_close() since you have put that comment. In any case, below sequence of operations triggers a splat when perf_mmap_close() tries to access event->rb, event->pmu etc. which were already freed by __pmu_detach_event(). Sequence: Kernel Userspace ------ --------- perf_pmu_register() fd = perf_event_open() p = mmap(fd) perf_pmu_unregister() munmap(p) close(fd) Splat: BUG: kernel NULL pointer dereference, address: 0000000000000088 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 105f90067 P4D 105f90067 PUD 11a94a067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 49 UID: 0 PID: 3456 Comm: perf-event-mmap Tainted: G OE 6.12.0-vanilla-dirty #273 Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: Dell Inc. PowerEdge R6515/07PXPY, BIOS 2.7.3 03/31/2022 RIP: 0010:perf_mmap_close+0x69/0x316 Code: [...] RSP: 0018:ffffc90003773970 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888125c2d400 RSI: ffff88bf7c8a1900 RDI: ffff888125c2d400 RBP: ffff888103ccaf40 R08: 0000000000000000 R09: 0000000000000000 R10: 3030303030303030 R11: 3030303030303030 R12: ffff88811f58d080 R13: ffffc90003773a70 R14: ffffc90003773a28 R15: 00007fcc1df1d000 FS: 00007fcc1e72e6c0(0000) GS:ffff88bf7c880000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000088 CR3: 000000010396c003 CR4: 0000000000f70ef0 PKRU: 55555554 Call Trace: ? __die_body.cold+0x19/0x27 ? page_fault_oops+0x15a/0x2f0 ? exc_page_fault+0x7e/0x180 ? asm_exc_page_fault+0x26/0x30 ? perf_mmap_close+0x69/0x316 remove_vma+0x2f/0x70 vms_complete_munmap_vmas+0xdc/0x190 do_vmi_align_munmap+0x1d7/0x250 do_vmi_munmap+0xd0/0x180 __vm_munmap+0xa2/0x170 ? hrtimer_start_range_ns+0x26f/0x3b0 __x64_sys_munmap+0x1b/0x30 do_syscall_64+0x82/0x160 ? srso_alias_return_thunk+0x5/0xfbef5 ? tty_insert_flip_string_and_push_buffer+0x8d/0xc0 ? srso_alias_return_thunk+0x5/0xfbef5 ? remove_wait_queue+0x24/0x60 ? srso_alias_return_thunk+0x5/0xfbef5 ? n_tty_write+0x36f/0x520 ? srso_alias_return_thunk+0x5/0xfbef5 ? __wake_up+0x44/0x60 ? srso_alias_return_thunk+0x5/0xfbef5 ? file_tty_write.isra.0+0x20c/0x2c0 ? srso_alias_return_thunk+0x5/0xfbef5 ? vfs_write+0x290/0x450 ? srso_alias_return_thunk+0x5/0xfbef5 ? srso_alias_return_thunk+0x5/0xfbef5 ? syscall_exit_to_user_mode+0x10/0x210 ? srso_alias_return_thunk+0x5/0xfbef5 ? do_syscall_64+0x8e/0x160 ? __rseq_handle_notify_resume+0xa6/0x4e0 ? __pfx_hrtimer_wakeup+0x10/0x10 ? srso_alias_return_thunk+0x5/0xfbef5 ? syscall_exit_to_user_mode+0x1d5/0x210 ? srso_alias_return_thunk+0x5/0xfbef5 ? do_syscall_64+0x8e/0x160 ? exc_page_fault+0x7e/0x180 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fcc1e849eab Code: [...] RSP: 002b:00007fcc1e72de08 EFLAGS: 00000202 ORIG_RAX: 000000000000000b RAX: ffffffffffffffda RBX: 00007fcc1e72ecdc RCX: 00007fcc1e849eab RDX: 0000000000011000 RSI: 0000000000011000 RDI: 00007fcc1df1d000 RBP: 00007fcc1e72dec0 R08: 0000000000000000 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000202 R12: 00007fcc1e72e6c0 R13: ffffffffffffff88 R14: 0000000000000000 R15: 00007ffd1a4ce000