kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 9 Comm: kworker/u4:1 Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: netns cleanup_net 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+0x74b/0xb60 kernel/time/timer.c:1817 Code: 89 ef e8 88 d8 3c 00 4d 89 65 00 4d 85 e4 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 RSP: 0018:ffff8881f6e09d40 EFLAGS: 00010802 RAX: 1bd5a00000000025 RBX: 1ffff1103cbf6e39 RCX: dffffc0000000000 RDX: 0000000080000102 RSI: 0000000000000004 RDI: ffff8881f6e09cc0 RBP: ffff8881f6e09eb8 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: dead00000000012a R13: ffff8881f6e09e00 R14: ffff8881e5fb71c8 R15: 1ffff1103cbf6e38 FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 00000001e60f5000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 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:__read_once_size include/linux/compiler.h:268 [inline] RIP: 0010:task_cpu include/linux/sched.h:1858 [inline] RIP: 0010:mutex_spin_on_owner+0x148/0x2e0 kernel/locking/mutex.c:581 Code: e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 01 89 45 00 49 f7 06 08 00 00 00 0f 85 7d 01 00 00 48 8b 85 78 ff ff ff 42 0f b6 04 38 <84> c0 0f 85 29 01 00 00 48 8b 45 c8 44 8b 30 48 8b 45 80 42 80 3c RSP: 0018:ffff8881f5dcf7c0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffff8881dfe53f00 RCX: ffffffff8147eff9 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881f5dc6e40 RBP: ffff8881f5dcf850 R08: dffffc0000000000 R09: ffffed103ebb8dc9 R10: ffffed103ebb8dc9 R11: 1ffff1103ebb8dc8 R12: ffffffff8619add0 R13: ffffffff8619adc0 R14: ffff8881f5dc6e40 R15: dffffc0000000000 mutex_optimistic_spin kernel/locking/mutex.c:685 [inline] __mutex_lock_common kernel/locking/mutex.c:1063 [inline] __mutex_lock+0x661/0xe30 kernel/locking/mutex.c:1114 __mutex_lock_slowpath+0xe/0x10 kernel/locking/mutex.c:1375 mutex_lock+0xcf/0xe0 kernel/locking/mutex.c:296 rtnl_lock+0x15/0x20 net/core/rtnetlink.c:72 netdev_run_todo+0xa84/0xc70 net/core/dev.c:9482 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:112 vti6_exit_batch_net+0x26f/0x2b0 net/ipv6/ip6_vti.c:1177 ops_exit_list net/core/net_namespace.c:187 [inline] cleanup_net+0x5fd/0xb40 net/core/net_namespace.c:612 process_one_work+0x73b/0xcc0 kernel/workqueue.c:2290 worker_thread+0xa5c/0x13b0 kernel/workqueue.c:2436 kthread+0x31e/0x3a0 kernel/kthread.c:288 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354 Modules linked in: ---[ end trace 5a457f73b4160d59 ]--- 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+0x74b/0xb60 kernel/time/timer.c:1817 Code: 89 ef e8 88 d8 3c 00 4d 89 65 00 4d 85 e4 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 RSP: 0018:ffff8881f6e09d40 EFLAGS: 00010802 RAX: 1bd5a00000000025 RBX: 1ffff1103cbf6e39 RCX: dffffc0000000000 RDX: 0000000080000102 RSI: 0000000000000004 RDI: ffff8881f6e09cc0 RBP: ffff8881f6e09eb8 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: dead00000000012a R13: ffff8881f6e09e00 R14: ffff8881e5fb71c8 R15: 1ffff1103cbf6e38 FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 00000001e60f5000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 89 ef mov %ebp,%edi 2: e8 88 d8 3c 00 call 0x3cd88f 7: 4d 89 65 00 mov %r12,0x0(%r13) b: 4d 85 e4 test %r12,%r12 e: 74 2e je 0x3e 10: e8 aa dd 0e 00 call 0xeddbf 15: 49 83 c4 08 add $0x8,%r12 19: 4c 89 e0 mov %r12,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 57 d8 3c 00 call 0x3cd88f 38: 4d 89 2c 24 mov %r13,(%r12) 3c: eb 05 jmp 0x43 3e: e8 .byte 0xe8 3f: 7c .byte 0x7c