watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.5:9510] Modules linked in: irq event stamp: 3637027 hardirqs last enabled at (3637026): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (3637027): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (43344): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (43999): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (43999): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 9510 Comm: syz-executor.5 Not tainted 4.14.275-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88805790c640 task.stack: ffff888057910000 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_acquire+0x1ec/0x3f0 kernel/locking/lockdep.c:4001 RSP: 0018:ffff8880ba4077b0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e1309 RBX: ffff88805790c640 RCX: 0000000000005891 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286 RBP: ffffffff89d95d48 R08: ffffffff8b9d0f48 R09: 00000000000421a4 R10: ffff88805790cf40 R11: ffff88805790c640 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 FS: 00007ff1665cf700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555611d708 CR3: 000000009bc71000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_write_lock_bh include/linux/rwlock_api_smp.h:203 [inline] _raw_write_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:320 __neigh_create+0x7be/0x19b0 net/core/neighbour.c:534 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:preempt_count arch/x86/include/asm/preempt.h:23 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0xe/0x50 kernel/kcov.c:65 RSP: 0018:ffff888057917770 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: ffff88805790c640 RBX: 0000000000000000 RCX: ffffc900069dd000 RDX: 0000000000023132 RSI: ffffffff818b34a7 RDI: ffff8880b57d2a80 RBP: ffff8880b57d2a80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88805790c640 R12: 0000000000000104 R13: 0000000000000002 R14: 0000000000000001 R15: dffffc0000000000 do_select+0xb08/0x1290 fs/select.c:532 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: 0033:0x7ff167c5a0e9 RSP: 002b:00007ff1665cf168 EFLAGS: 00000246 ORIG_RAX: 000000000000010e RAX: ffffffffffffffda RBX: 00007ff167d6cf60 RCX: 00007ff167c5a0e9 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000040 RBP: 00007ff167cb408d R08: 0000000020000200 R09: 0000000000000000 R10: 0000000020000140 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd57f3eabf R14: 00007ff1665cf300 R15: 0000000000022000 Code: 84 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 ee 01 00 00 48 83 3d b9 c0 ae 07 00 0f 84 4a 01 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9507 Comm: syz-executor.5 Not tainted 4.14.275-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809b188580 task.stack: ffff888058120000 RIP: 0010:apic_timer_interrupt+0x0/0xa0 RSP: 0018:ffff888058127ad8 EFLAGS: 00000097 RAX: ffff88809b188580 RBX: 1ffff1100b024f64 RCX: 1ffff110136311c5 RDX: 0000000000000000 RSI: ffff88809b188e08 RDI: 0000000000000286 RBP: ffff888058127bb0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888058127be0 R14: 0000000000000001 R15: ffff88805790c67c FS: 00005555558b9400(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e72d000 CR3: 000000009bc71000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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:ffff888058127b00 EFLAGS: 00000297 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: 0033:0x7ff167c0cd2b RSP: 002b:00007ffd57f3eb20 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 000000000000000f RCX: 00007ff167c0cd2b RDX: 0000001b2e720000 RSI: 00007ff167aec9e8 RDI: 000000000000000e RBP: 00007ff167d6e960 R08: 0000000000000000 R09: 0000000064a32d66 R10: 00136602a1fe3940 R11: 0000000000000293 R12: 000000000003e9ba R13: 00007ffd57f3ec20 R14: 00007ffd57f3ec40 R15: 0000000000000032 Code: fc e8 c5 03 c0 f9 48 89 e7 e8 ad 3a c0 f9 e8 9c 03 c0 f9 e9 fc f0 ff ff 0f 1f 00 4c 87 c1 e9 38 a2 f0 f9 c3 90 90 90 90 90 90 90 <0f> 01 ca 68 10 ff ff ff fc f6 44 24 10 03 74 10 0f 01 f8 0f 1f ---------------- Code disassembly (best guess): 0: 84 08 test %cl,(%rax) 2: 00 00 add %al,(%rax) 4: 00 00 add %al,(%rax) 6: 00 00 add %al,(%rax) 8: 48 c1 e8 03 shr $0x3,%rax c: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) 10: 0f 85 ee 01 00 00 jne 0x204 16: 48 83 3d b9 c0 ae 07 cmpq $0x0,0x7aec0b9(%rip) # 0x7aec0d7 1d: 00 1e: 0f 84 4a 01 00 00 je 0x16e 24: 48 8b 7c 24 08 mov 0x8(%rsp),%rdi 29: 57 push %rdi 2a: 9d popfq * 2b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction 30: 48 83 c4 18 add $0x18,%rsp 34: 5b pop %rbx 35: 5d pop %rbp 36: 41 5c pop %r12 38: 41 5d pop %r13 3a: 41 5e pop %r14 3c: 41 5f pop %r15 3e: c3 retq 3f: 65 gs