watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.1:27307] Modules linked in: irq event stamp: 2927533 hardirqs last enabled at (2927532): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (2927533): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (118): [] skb_record_rx_queue include/linux/skbuff.h:4019 [inline] softirqs last enabled at (118): [] tun_rx_batched.isra.0+0x463/0x740 drivers/net/tun.c:1542 softirqs last disabled at (203): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (203): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 0 PID: 27307 Comm: syz-executor.1 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x50/0x80 kernel/locking/spinlock.c:192 Code: c0 98 82 f1 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d 01 31 d8 01 00 74 25 fb 66 0f 1f 44 00 00 01 00 00 00 e8 26 1b 28 f9 65 8b 05 9f 8d e8 77 85 c0 74 02 5d RSP: 0000:ffff8880ba007de0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3053 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff88809455edc4 RBP: ffff8880ba022b40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff869a4ab0 R13: ffff8880ba022b40 R14: ffff8880ba007e78 R15: 0000000000000000 FS: 00007f00a9a9e700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31222000 CR3: 000000019ad65000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: expire_timers+0x238/0x4e0 kernel/time/timer.c:1374 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0033:0x7f00ab128fe9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f00a9a9e218 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 00007f00ab23bf68 RCX: 00007f00ab128fe9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f00ab23bf6c RBP: 00007f00ab23bf60 R08: 00000163e58c2fee R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00007f00ab23bf6c R13: 00007ffdb6c8b7bf R14: 00007f00a9a9e300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8108 Comm: syz-fuzzer Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0033:0x420e35 Code: 48 8b 5c 24 78 89 ce 4c 8b 44 24 70 4c 8b 8c 24 90 00 00 00 4c 8b 94 24 98 00 00 00 4c 8b 5c 24 58 e9 32 ff ff ff 48 89 04 24 <48> 8b 84 24 90 00 00 00 48 89 44 24 08 48 8b 5c 24 58 48 89 5c 24 RSP: 002b:000000c00003bea8 EFLAGS: 00000206 RAX: 000000c00b916cf0 RBX: 00007fcd223946e0 RCX: 00007fcd223946e0 RDX: 0000000000000045 RSI: 0000000000000045 RDI: ffffffffffffffff RBP: 000000c00003bf28 R08: 000000000000000b R09: ffffffffffffffff R10: 00007fcd223946e0 R11: 0000000000000010 R12: 000000c00b916cf0 R13: 000000c000094a80 R14: 0000000000000200 R15: 0000000000000200 FS: 000000c000304490 GS: 0000000000000000 ---------------- Code disassembly (best guess), 5 bytes skipped: 0: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 7: fc ff df a: 48 c1 e8 03 shr $0x3,%rax e: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) 12: 75 31 jne 0x45 14: 48 83 3d 01 31 d8 01 cmpq $0x0,0x1d83101(%rip) # 0x1d8311d 1b: 00 1c: 74 25 je 0x43 1e: fb sti 1f: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) * 25: bf 01 00 00 00 mov $0x1,%edi <-- trapping instruction 2a: e8 26 1b 28 f9 callq 0xf9281b55 2f: 65 8b 05 9f 8d e8 77 mov %gs:0x77e88d9f(%rip),%eax # 0x77e88dd5 36: 85 c0 test %eax,%eax 38: 74 02 je 0x3c 3a: 5d pop %rbp