BUG: unable to handle page fault for address: ffffffff816b6d15 #PF: supervisor write access in kernel mode #PF: error_code(0x0003) - permissions violation PGD 5c11067 P4D 5c11067 PUD 5c12063 PMD 16001e1 Oops: 0003 [#1] PREEMPT SMP KASAN CPU: 0 PID: 1550 Comm: syz.4.325 Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:__hlist_del include/linux/list.h:791 [inline] RIP: 0010:detach_timer kernel/time/timer.c:824 [inline] RIP: 0010:expire_timers kernel/time/timer.c:1482 [inline] RIP: 0010:__run_timers+0x759/0xb60 kernel/time/timer.c:1817 Code: 74 2e e8 aa dd 0e 00 49 83 c4 08 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 57 d8 3c 00 <4d> 89 2c 24 eb 05 e8 7c dd 0e 00 49 bd 00 00 00 00 00 fc ff df 42 RSP: 0018:ffff8881f6e09d40 EFLAGS: 00010046 RAX: 1ffffffff02d6da2 RBX: 1ffff1103c3eee39 RCX: dffffc0000000000 RDX: 0000000000000102 RSI: 0000000000000004 RDI: ffff8881f6e09cc0 RBP: ffff8881f6e09eb8 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: ffffffff816b6d15 R13: ffff8881f6e09e00 R14: ffff8881e1f771c8 R15: 1ffff1103c3eee38 FS: 00007f882166e6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff816b6d15 CR3: 00000001e2cf3000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000010602 Call Trace: run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830 __do_softirq+0x236/0x660 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x197/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:539 [inline] smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x4/0x80 kernel/kcov.c:275 Code: 03 00 00 00 4a 89 7c 01 10 4a 89 74 01 18 4a 89 44 01 20 48 ff c2 48 89 11 5d c3 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 <48> 8b 45 08 65 48 8b 15 40 0b a3 7e 65 8b 0d 45 0b a3 7e f7 c1 00 RSP: 0018:ffff8881d408fae8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff8881ce060000 RBX: ffff8881d408fbc0 RCX: ffffffff815504e0 RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff8881d408fae8 R08: dffffc0000000000 R09: ffffed1039c0c005 R10: ffffed1039c0c005 R11: 1ffff11039c0c004 R12: ffff8881ce060020 R13: 0000000000000001 R14: dffffc0000000000 R15: ffff8881d47dfb50 refcount_add include/linux/refcount.h:190 [inline] refcount_inc include/linux/refcount.h:228 [inline] get_task_struct include/linux/sched/task.h:112 [inline] mark_wake_futex+0xcd/0x200 kernel/futex.c:1567 futex_wake+0x39a/0x5d0 kernel/futex.c:1717 do_futex+0xc36/0x1290 kernel/futex.c:3893 __do_sys_futex kernel/futex.c:3949 [inline] __se_sys_futex+0x2b4/0x360 kernel/futex.c:3917 __x64_sys_futex+0xe5/0x100 kernel/futex.c:3917 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f8823005969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f882166e0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f882322cfa8 RCX: 00007f8823005969 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f882322cfac RBP: 00007f882322cfa0 R08: 00007ffcf63f60b0 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f882322cfac R13: 0000000000000000 R14: 00007ffcf63aac50 R15: 00007ffcf63aad38 Modules linked in: CR2: ffffffff816b6d15 ---[ end trace 097349a55c197622 ]--- RIP: 0010:__hlist_del include/linux/list.h:791 [inline] RIP: 0010:detach_timer kernel/time/timer.c:824 [inline] RIP: 0010:expire_timers kernel/time/timer.c:1482 [inline] RIP: 0010:__run_timers+0x759/0xb60 kernel/time/timer.c:1817 Code: 74 2e e8 aa dd 0e 00 49 83 c4 08 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 57 d8 3c 00 <4d> 89 2c 24 eb 05 e8 7c dd 0e 00 49 bd 00 00 00 00 00 fc ff df 42 RSP: 0018:ffff8881f6e09d40 EFLAGS: 00010046 RAX: 1ffffffff02d6da2 RBX: 1ffff1103c3eee39 RCX: dffffc0000000000 RDX: 0000000000000102 RSI: 0000000000000004 RDI: ffff8881f6e09cc0 RBP: ffff8881f6e09eb8 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: ffffffff816b6d15 R13: ffff8881f6e09e00 R14: ffff8881e1f771c8 R15: 1ffff1103c3eee38 FS: 00007f882166e6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff816b6d15 CR3: 00000001e2cf3000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000010602 ---------------- Code disassembly (best guess): 0: 74 2e je 0x30 2: e8 aa dd 0e 00 call 0xeddb1 7: 49 83 c4 08 add $0x8,%r12 b: 4c 89 e0 mov %r12,%rax e: 48 c1 e8 03 shr $0x3,%rax 12: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 19: fc ff df 1c: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) 20: 74 08 je 0x2a 22: 4c 89 e7 mov %r12,%rdi 25: e8 57 d8 3c 00 call 0x3cd881 * 2a: 4d 89 2c 24 mov %r13,(%r12) <-- trapping instruction 2e: eb 05 jmp 0x35 30: e8 7c dd 0e 00 call 0xeddb1 35: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 3c: fc ff df 3f: 42 rex.X