watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.1:9514] Modules linked in: irq event stamp: 3944087 hardirqs last enabled at (3944086): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (3944087): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (3450): [] spin_unlock_bh include/linux/spinlock.h:362 [inline] softirqs last enabled at (3450): [] packet_poll+0x313/0x660 net/packet/af_packet.c:4234 softirqs last disabled at (3523): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (3523): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 9514 Comm: syz-executor.1 Not tainted 4.14.276-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888057ff6340 task.stack: ffff888057808000 RIP: 0010:preempt_count_add+0x20/0x170 kernel/sched/core.c:3102 RSP: 0018:ffff8880ba407750 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff10 RAX: dffffc0000000000 RBX: ffffffff8bed1d40 RCX: 1ffffffff11993ac RDX: 0000000000000004 RSI: ffffffff87ccff40 RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000286 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff8880b3c45040 R14: ffff8880aaa81398 R15: ffff8880aaf7acc0 FS: 00007f653d79e700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f223000 CR3: 0000000094c6f000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1185 [inline] rcu_lockdep_current_cpu_online+0x30/0x140 kernel/rcu/tree.c:1177 rcu_read_lock_sched_held+0xd3/0x1d0 kernel/rcu/update.c:113 trace_net_dev_queue include/trace/events/net.h:120 [inline] __dev_queue_xmit+0x1ae5/0x2480 net/core/dev.c:3487 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip6_finish_output2+0xc6a/0x1f10 net/ipv6/ip6_output.c:120 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 vivid-000: kernel_thread() failed 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: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:ffff88805780f620 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e1311 RBX: 0000000000000286 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286 RBP: ffffffff8bef2ad0 R08: ffffffff8b9cce18 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88805780f688 R13: 0000000000000000 R14: ffff88809edc8080 R15: ffffffff8bef2ac0 spin_unlock_irqrestore include/linux/spinlock.h:372 [inline] ep_call_nested.constprop.0+0x1c2/0x300 fs/eventpoll.c:512 ep_eventpoll_poll+0x111/0x190 fs/eventpoll.c:951 do_select+0xa83/0x1290 fs/select.c:513 core_sys_select+0x32f/0x6a0 fs/select.c:656 do_pselect fs/select.c:733 [inline] SYSC_pselect6 fs/select.c:774 [inline] SyS_pselect6+0x358/0x3c0 fs/select.c:759 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f653ee290e9 RSP: 002b:00007f653d79e168 EFLAGS: 00000246 ORIG_RAX: 000000000000010e RAX: ffffffffffffffda RBX: 00007f653ef3bf60 RCX: 00007f653ee290e9 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000040 RBP: 00007f653ee8308d R08: 0000000020000200 R09: 0000000000000000 R10: 0000000020000140 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc344e146f R14: 00007f653d79e300 R15: 0000000000022000 Code: ff 66 2e 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 55 89 fd 53 48 c7 c3 40 1d ed 8b 48 89 da 48 c1 ea 03 0f b6 14 02 <48> 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 11 01 00 00 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9515 Comm: syz-executor.3 Not tainted 4.14.276-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88805781e380 task.stack: ffff888057820000 RIP: 0010:__read_once_size include/linux/compiler.h:185 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0x181/0x370 kernel/smp.c:302 RSP: 0018:ffff888057827b00 EFLAGS: 00000297 RAX: ffff88805781e380 RBX: 1ffff1100af04f64 RCX: 1ffff1100af03d85 RDX: 0000000000000000 RSI: ffff88805781ec08 RDI: 0000000000000286 RBP: ffff888057827bb0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888057827be0 R14: 0000000000000001 R15: ffff8880579a04fc FS: 0000555555b8d400(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f224000 CR3: 00000000b4d5a000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: task_function_call+0xcc/0x130 kernel/events/core.c:115 event_function_call+0x1e8/0x3c0 kernel/events/core.c:283 perf_remove_from_context+0x89/0x170 kernel/events/core.c:1957 perf_event_release_kernel+0xe4/0x8a0 kernel/events/core.c:4360 perf_release+0x33/0x40 kernel/events/core.c:4443 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f198f00ed2b RSP: 002b:00007ffc6e5f6740 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007f198f00ed2b RDX: 0000001b2f220000 RSI: 00007f198edd6628 RDI: 0000000000000004 RBP: 00007f198f170960 R08: 0000000000000000 R09: 00000000fe87d9d5 R10: 0010786d902a38ae R11: 0000000000000293 R12: 0000000000028b97 R13: 00007ffc6e5f6840 R14: 00007f198f16f030 R15: 0000000000000032 Code: cd 08 00 48 8b 54 24 10 4c 89 e9 8b 7c 24 1c 48 8d 74 24 40 e8 71 fa ff ff 41 89 c4 8b 44 24 58 a8 01 74 0f e8 b1 cd 08 00 f3 90 <8b> 44 24 58 a8 01 75 f1 e8 a2 cd 08 00 e8 9d cd 08 00 bf 01 00 ---------------- Code disassembly (best guess): 0: ff 66 2e jmpq *0x2e(%rsi) 3: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) a: 00 b: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 12: fc ff df 15: 55 push %rbp 16: 89 fd mov %edi,%ebp 18: 53 push %rbx 19: 48 c7 c3 40 1d ed 8b mov $0xffffffff8bed1d40,%rbx 20: 48 89 da mov %rbx,%rdx 23: 48 c1 ea 03 shr $0x3,%rdx 27: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx * 2b: 48 89 d8 mov %rbx,%rax <-- trapping instruction 2e: 83 e0 07 and $0x7,%eax 31: 83 c0 03 add $0x3,%eax 34: 38 d0 cmp %dl,%al 36: 7c 08 jl 0x40 38: 84 d2 test %dl,%dl 3a: 0f 85 11 01 00 00 jne 0x151