general protection fault, probably for non-canonical address 0xdffffc00000000b2: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000590-0x0000000000000597] CPU: 0 PID: 8063 Comm: kworker/u4:0 Not tainted 5.14.0-rc6-next-20210819-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:latency_exceeded block/blk-wbt.c:237 [inline] RIP: 0010:wb_timer_fn+0x149/0x1750 block/blk-wbt.c:360 Code: 03 80 3c 02 00 0f 85 79 13 00 00 48 8b 9b c8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 90 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 46 13 00 00 48 8b 9b 90 05 00 00 48 b8 00 00 00 RSP: 0018:ffffc90000007c98 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: 00000000000000b2 RSI: ffffffff83d3ea3d RDI: 0000000000000590 RBP: ffff88801ab83c00 R08: 0000000000000003 R09: ffff88801ab83d83 R10: ffffffff83d3ea32 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000000 R14: ffff88814639c300 R15: ffff88801ab83cd0 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555d7976ca8 CR3: 000000007caa1000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: call_timer_fn+0x1ab/0x6c0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x133/0x190 kernel/softirq.c:636 irq_exit_rcu+0x9/0x30 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:strlen+0x5f/0x90 lib/string.c:582 Code: 00 00 00 00 fc ff df 48 89 e8 48 83 c0 01 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 0f b6 14 1a 38 ca 7f 04 84 d2 75 1f 80 38 00 <75> de 48 83 c4 18 48 29 e8 5b 5d c3 48 83 c4 18 31 c0 5b 5d c3 e8 RSP: 0018:ffffc9000bcef908 EFLAGS: 00000206 RAX: ffffffff898d3f83 RBX: dffffc0000000000 RCX: 0000000000000003 RDX: 0000000000000000 RSI: ffffffff8b97ee00 RDI: ffffffff898d3f80 RBP: ffffffff898d3f80 R08: 0000000000000000 R09: ffffffff8d6e2a57 R10: fffffbfff1adc54a R11: 0000000000000000 R12: ffffffff8b97ee00 R13: ffffffff8b87c280 R14: ffffffff8b97ee00 R15: ffffc9000bcef9e8 strlen include/linux/fortify-string.h:60 [inline] trace_event_get_offsets_lock include/trace/events/lock.h:39 [inline] perf_trace_lock+0xb1/0x4d0 include/trace/events/lock.h:39 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x4a8/0x720 kernel/locking/lockdep.c:5636 rcu_lock_release include/linux/rcupdate.h:272 [inline] rcu_read_unlock include/linux/rcupdate.h:720 [inline] inet_twsk_purge+0x508/0x7d0 net/ipv4/inet_timewait_sock.c:299 ops_exit_list+0x10f/0x160 net/core/net_namespace.c:171 cleanup_net+0x4ef/0xb10 net/core/net_namespace.c:591 process_one_work+0x9c9/0x16b0 kernel/workqueue.c:2297 worker_thread+0x65b/0x1200 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Modules linked in: ---[ end trace 3341dc91f487a1a4 ]--- RIP: 0010:latency_exceeded block/blk-wbt.c:237 [inline] RIP: 0010:wb_timer_fn+0x149/0x1750 block/blk-wbt.c:360 Code: 03 80 3c 02 00 0f 85 79 13 00 00 48 8b 9b c8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 90 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 46 13 00 00 48 8b 9b 90 05 00 00 48 b8 00 00 00 RSP: 0018:ffffc90000007c98 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: 00000000000000b2 RSI: ffffffff83d3ea3d RDI: 0000000000000590 RBP: ffff88801ab83c00 R08: 0000000000000003 R09: ffff88801ab83d83 R10: ffffffff83d3ea32 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000000 R14: ffff88814639c300 R15: ffff88801ab83cd0 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555d7976ca8 CR3: 000000007caa1000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 03 80 3c 02 00 0f add 0xf00023c(%rax),%eax 6: 85 79 13 test %edi,0x13(%rcx) 9: 00 00 add %al,(%rax) b: 48 8b 9b c8 00 00 00 mov 0xc8(%rbx),%rbx 12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 19: fc ff df 1c: 48 8d bb 90 05 00 00 lea 0x590(%rbx),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 46 13 00 00 jne 0x137a 34: 48 8b 9b 90 05 00 00 mov 0x590(%rbx),%rbx 3b: 48 rex.W 3c: b8 .byte 0xb8 3d: 00 00 add %al,(%rax)