watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.0:9507] Modules linked in: irq event stamp: 3461763 hardirqs last enabled at (3461762): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (3461763): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (20052): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (20329): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (20329): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 9507 Comm: syz-executor.0 Not tainted 4.14.268-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a1d0a2c0 task.stack: ffff88805d4f0000 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:192 RSP: 0018:ffff8880ba407630 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e1279 RBX: 0000000000000286 RCX: 1ffff110143a158b RDX: dffffc0000000000 RSI: ffff8880a1d0ac38 RDI: 0000000000000286 RBP: ffffffff8bfec448 R08: ffffffff8bfec448 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a198a718 R13: dffffc0000000000 R14: 1ffff11017480ecc R15: ffff8880ba4076e0 FS: 00007f8424977700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020e9e000 CR3: 000000009f9f5000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_object_activate+0x1a0/0x490 lib/debugobjects.c:464 debug_rcu_head_queue kernel/rcu/rcu.h:152 [inline] __call_rcu.constprop.0+0x31/0x7d0 kernel/rcu/tree.c:3050 neigh_destroy+0x343/0x460 net/core/neighbour.c:762 neigh_release include/net/neighbour.h:416 [inline] neigh_cleanup_and_release+0x9e/0xc0 net/core/neighbour.c:108 neigh_del+0x161/0x1f0 net/core/neighbour.c:141 neigh_forced_gc net/core/neighbour.c:190 [inline] neigh_alloc net/core/neighbour.c:315 [inline] __neigh_create+0xc5d/0x19b0 net/core/neighbour.c:499 ip6_finish_output2+0x802/0x1f10 net/ipv6/ip6_output.c:117 ip6_finish_output+0x5c6/0xd50 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x1c5/0x660 net/ipv6/ip6_output.c:209 dst_output include/net/dst.h:470 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] ndisc_send_skb+0x82a/0x1390 net/ipv6/ndisc.c:483 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677 addrconf_rs_timer+0x2bb/0x5a0 net/ipv6/addrconf.c:3769 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319 __run_timers kernel/time/timer.c:1637 [inline] run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1650 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:638 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:unwind_next_frame+0x280/0x17d0 arch/x86/kernel/unwind_orc.c:349 RSP: 0018:ffff88805d4f7170 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: 1ffff1100ba9ee35 RCX: ffffffff8a8fe5ec RDX: 1ffffffff151fcbe RSI: ffffffff8a8fe5c8 RDI: ffffffff8a2cfedc RBP: 0000000000000001 R08: ffffffff8a8fe5f0 R09: ffffffff8a8fe64c R10: 000000000006cc3a R11: 0000000000066071 R12: ffff88805d4f72ad R13: ffff88805d4f72b0 R14: ffff88805d4f72c8 R15: ffff88805d4f7278 perf_callchain_kernel+0x38c/0x520 arch/x86/events/core.c:2344 get_perf_callchain+0x2de/0x740 kernel/events/callchain.c:217 perf_callchain+0x147/0x190 kernel/events/callchain.c:190 perf_prepare_sample+0xc9a/0x1370 kernel/events/core.c:6166 __perf_event_output kernel/events/core.c:6282 [inline] perf_event_output_forward+0xc9/0x1f0 kernel/events/core.c:6300 __perf_event_overflow+0x113/0x310 kernel/events/core.c:7549 perf_swevent_overflow kernel/events/core.c:7625 [inline] perf_swevent_event+0x299/0x460 kernel/events/core.c:7653 do_perf_sw_event kernel/events/core.c:7766 [inline] ___perf_sw_event+0x2a1/0x480 kernel/events/core.c:7797 __perf_sw_event+0x4f/0x100 kernel/events/core.c:7809 perf_sw_event include/linux/perf_event.h:1046 [inline] __do_page_fault+0x692/0xad0 arch/x86/mm/fault.c:1483 page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1123 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:181 RSP: 0018:ffff88805d4f7a60 EFLAGS: 00050202 RAX: ffffed100b91b8d9 RBX: 00000000000046c6 RCX: 0000000000004191 RDX: 00000000000046c6 RSI: 0000000020e9e000 RDI: ffff88805c8d8535 RBP: 0000000020e9dacb R08: 0000000000000001 R09: ffffed100b91b8d8 R10: ffff88805c8dc6c5 R11: 0000000000000000 R12: ffff88805c8d8000 R13: 00007ffffffff000 R14: 0000000020ea2191 R15: ffff88805fe6a1c0 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:55 [inline] copyin+0x99/0xc0 lib/iov_iter.c:146 _copy_from_iter_full+0x19c/0x760 lib/iov_iter.c:610 copy_from_iter_full include/linux/uio.h:126 [inline] skb_do_copy_data_nocache include/net/sock.h:1892 [inline] skb_copy_to_page_nocache include/net/sock.h:1918 [inline] tcp_sendmsg_locked+0x23fc/0x2ef0 net/ipv4/tcp.c:1360 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457 inet_sendmsg+0x11a/0x4e0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 SYSC_sendto net/socket.c:1763 [inline] SyS_sendto+0x1c7/0x2c0 net/socket.c:1731 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f8426002059 RSP: 002b:00007f8424977168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f8426114f60 RCX: 00007f8426002059 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000005 RBP: 00007f842605c08d R08: 0000000000000000 R09: 0000000000000053 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd2122e03f R14: 00007f8424977300 R15: 0000000000022000 Code: fa 48 c7 c0 c8 93 f0 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 2f 48 83 3d 5c 65 cc 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb b2 e8 75 ed db f9 eb c0 0f 0b 0f 0b 48 c7 c7 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9529 Comm: syz-executor.2 Not tainted 4.14.268-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809e96e140 task.stack: ffff88805d120000 RIP: 0010:rcu_is_watching+0x7a/0xb0 kernel/rcu/tree.c:1131 RSP: 0018:ffff8880ba507530 EFLAGS: 00000006 RAX: 0000000000000001 RBX: ffff8880ba52ca80 RCX: 1ffffffff1198fad RDX: 0000000000000000 RSI: ffffffff87ccf440 RDI: ffff8880ba52ca8c RBP: ffff88809e96e140 R08: ffffffff8b9d5270 R09: 0000000000000006 R10: 0000000000000000 R11: ffff88809e96e140 R12: ffff8880ba52ec80 R13: ffff8880a1c36b88 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007f26cbf19700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020f41000 CR3: 000000009fc35000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_lock_sched_held+0xc6/0x1d0 kernel/rcu/update.c:111 trace_hrtimer_cancel include/trace/events/timer.h:278 [inline] debug_deactivate kernel/time/hrtimer.c:454 [inline] __run_hrtimer kernel/time/hrtimer.c:1193 [inline] __hrtimer_run_queues+0x945/0xc80 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1079 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1104 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:__read_once_size include/linux/compiler.h:185 [inline] RIP: 0010:queued_write_lock_slowpath+0x80/0x1d0 kernel/locking/qrwlock.c:130 RSP: 0018:ffff8880ba5077b8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 00000000000000ff RBX: ffffffff89d95630 RCX: 0000000000007f19 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89d95630 RBP: ffffffff89d95634 R08: ffffffff8b9e2388 R09: 00000000000421a4 R10: ffff88809e96ea68 R11: ffff88809e96e140 R12: fffffbfff13b2ac6 R13: 0000000000000001 R14: 0000000000000000 R15: ffff8880a2efb840 queued_write_lock include/asm-generic/qrwlock.h:134 [inline] do_raw_write_lock+0xc2/0x1d0 kernel/locking/spinlock_debug.c:203 neigh_forced_gc net/core/neighbour.c:176 [inline] neigh_alloc net/core/neighbour.c:315 [inline] __neigh_create+0xb34/0x19b0 net/core/neighbour.c:499 ip6_finish_output2+0x802/0x1f10 net/ipv6/ip6_output.c:117 ip6_finish_output+0x5c6/0xd50 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x1c5/0x660 net/ipv6/ip6_output.c:209 dst_output include/net/dst.h:470 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] ndisc_send_skb+0x82a/0x1390 net/ipv6/ndisc.c:483 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677 addrconf_rs_timer+0x2bb/0x5a0 net/ipv6/addrconf.c:3769 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319 __run_timers kernel/time/timer.c:1637 [inline] run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1650 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:638 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:181 RSP: 0018:ffff88805d127a60 EFLAGS: 00050206 ORIG_RAX: ffffffffffffff10 RAX: ffffed100bc61000 RBX: 0000000000003b4c RCX: 0000000000003acb RDX: 0000000000003b4c RSI: 0000000020f42000 RDI: ffff88805e304535 RBP: 0000000020f41f7f R08: 0000000000000001 R09: ffffed100bc60fff R10: ffff88805e307fff R11: 0000000000000000 R12: ffff88805e3044b4 R13: 00007ffffffff000 R14: 0000000020f45acb R15: ffff88805fe6ac80 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:55 [inline] copyin+0x99/0xc0 lib/iov_iter.c:146 _copy_from_iter_full+0x19c/0x760 lib/iov_iter.c:610 copy_from_iter_full include/linux/uio.h:126 [inline] skb_do_copy_data_nocache include/net/sock.h:1892 [inline] skb_copy_to_page_nocache include/net/sock.h:1918 [inline] tcp_sendmsg_locked+0x23fc/0x2ef0 net/ipv4/tcp.c:1360 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457 inet_sendmsg+0x11a/0x4e0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 SYSC_sendto net/socket.c:1763 [inline] SyS_sendto+0x1c7/0x2c0 net/socket.c:1731 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f26cd5a4059 RSP: 002b:00007f26cbf19168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f26cd6b6f60 RCX: 00007f26cd5a4059 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000005 RBP: 00007f26cd5fe08d R08: 0000000000000000 R09: 0000000000000053 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd71f4a1df R14: 00007f26cbf19300 R15: 0000000000022000 Code: 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 22 8b 43 0c d1 e8 83 e0 01 65 ff 0d 96 98 bb 7e <74> 06 48 83 c4 08 5b c3 e8 45 35 b9 ff 48 83 c4 08 5b c3 e8 3e ---------------- Code disassembly (best guess): 0: fa cli 1: 48 c7 c0 c8 93 f0 88 mov $0xffffffff88f093c8,%rax 8: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx f: fc ff df 12: 48 c1 e8 03 shr $0x3,%rax 16: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) 1a: 75 2f jne 0x4b 1c: 48 83 3d 5c 65 cc 01 cmpq $0x0,0x1cc655c(%rip) # 0x1cc6580 23: 00 24: 74 15 je 0x3b 26: 48 89 df mov %rbx,%rdi 29: 57 push %rdi 2a: 9d popfq * 2b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction 30: eb b2 jmp 0xffffffe4 32: e8 75 ed db f9 callq 0xf9dbedac 37: eb c0 jmp 0xfffffff9 39: 0f 0b ud2 3b: 0f 0b ud2 3d: 48 rex.W 3e: c7 .byte 0xc7 3f: c7 .byte 0xc7