watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.3:9861] Modules linked in: irq event stamp: 3446427 hardirqs last enabled at (3446426): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (3446427): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (23040): [] spin_unlock_bh include/linux/spinlock.h:362 [inline] softirqs last enabled at (23040): [] tipc_sk_rcv+0x764/0x1660 net/tipc/socket.c:1838 softirqs last disabled at (23675): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (23675): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 9861 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: ffff88808d04e040 task.stack: ffff8880954e8000 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:ffff8880ba4077b8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 00000000000000ff RBX: ffffffff89d96270 RCX: 0000000000000753 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89d96270 RBP: ffffffff89d96274 R08: ffffffff8b9a9558 R09: 00000000000421a4 R10: ffff88808d04e968 R11: ffff88808d04e040 R12: fffffbfff13b2c4e R13: 0000000000000001 R14: 0000000000000000 R15: ffff8880a8bed5c0 FS: 00007fe68e2a8700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2de25000 CR3: 00000000af9e1000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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+0xb48/0x19c0 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:memcmp+0x4f/0xb0 lib/string.c:918 RSP: 0018:ffff8880954ef5e0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 00000000000000ff RBX: ffff8880954ef6a7 RCX: ffff8880b114ab5f RDX: ffff8880b114ab5f RSI: ffff8880b114ab5f RDI: ffff8880954ef680 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: ffff88808d04e040 R12: ffff8880954ef6f0 R13: 000000000000000e R14: ffff8880954ef680 R15: ffff8880b114ab20 find_stack lib/stackdepot.c:180 [inline] depot_save_stack+0x10d/0x3f0 lib/stackdepot.c:229 save_stack mm/kasan/kasan.c:453 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0x139/0x160 mm/kasan/kasan.c:551 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3696 __kmalloc_reserve net/core/skbuff.c:137 [inline] __alloc_skb+0x96/0x510 net/core/skbuff.c:205 alloc_skb_fclone include/linux/skbuff.h:1022 [inline] tipc_buf_acquire+0x28/0xf0 net/tipc/msg.c:66 tipc_msg_build+0xcf/0xec0 net/tipc/msg.c:260 __tipc_sendstream+0x4d5/0x8c0 net/tipc/socket.c:1085 tipc_sendstream+0x4c/0x70 net/tipc/socket.c:1042 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 sock_write_iter+0x22c/0x370 net/socket.c:925 call_write_iter include/linux/fs.h:1780 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x44c/0x630 fs/read_write.c:482 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fe68f9330e9 RSP: 002b:00007fe68e2a8168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fe68fa45f60 RCX: 00007fe68f9330e9 RDX: 000000002000011a RSI: 0000000020000040 RDI: 0000000000000006 RBP: 00007fe68f98d08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff039e9c4f R14: 00007fe68e2a8300 R15: 0000000000022000 Code: 0f 84 d3 00 00 00 49 89 dc 49 89 de 41 bd 01 00 00 00 49 c1 ec 03 41 83 e6 07 48 b8 00 00 00 00 00 fc ff df 49 01 c4 eb 02 f3 90 <41> 0f b6 04 24 44 38 f0 7f 08 84 c0 0f 85 f6 00 00 00 0f b6 03 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9852 Comm: syz-executor.0 Not tainted 4.14.276-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809999e280 task.stack: ffff888090290000 RIP: 0010:__lock_acquire+0x6a9/0x3f20 kernel/locking/lockdep.c:3481 RSP: 0018:ffff8880ba5077a0 EFLAGS: 00000002 RAX: 0000000000000012 RBX: 9dd73c59e563c66e RCX: ffff88809999eb58 RDX: dffffc0000000000 RSI: ffff88809999eb58 RDI: ffffffff8b9ef180 RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000a6012 R10: ffff88809999eb58 R11: ffff88809999e280 R12: ffff88809999eb70 R13: 0000000000000000 R14: 0000000000000012 R15: ffffffff8bed1d40 FS: 00007f131f521700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2db27000 CR3: 00000000a9a15000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:629 [inline] ring_buffer_wakeup+0x36/0x250 kernel/events/core.c:5151 perf_event_wakeup kernel/events/core.c:5575 [inline] perf_pending_event+0x152/0x260 kernel/events/core.c:5602 irq_work_run_list+0xf0/0x160 kernel/irq_work.c:156 irq_work_run+0x4e/0xc0 kernel/irq_work.c:171 smp_irq_work_interrupt+0xa3/0x4e0 arch/x86/kernel/irq_work.c:21 irq_work_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:824 RIP: 0010:ndisc_send_skb+0xb11/0x1390 include/linux/skbuff.h:896 RSP: 0018:ffff8880ba507b50 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff09 RAX: ffff888093c35700 RBX: ffff8880aa849748 RCX: 0000000000000000 RDX: 1ffff1101513a0ab RSI: ffff888093c35700 RDI: ffff888093c35748 RBP: ffff8880ba507cc8 R08: 0000000000000000 R09: 0000000000000000 R10: ffff8880a89d0510 R11: 0000000000000000 R12: ffff8880a89d0500 R13: ffffffff886172e0 R14: ffff8880aa7b0180 R15: ffff8880a89d05d0 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 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1016 do_softirq.part.0+0x154/0x1b0 kernel/softirq.c:332 do_softirq kernel/softirq.c:324 [inline] __local_bh_enable_ip+0x12b/0x170 kernel/softirq.c:185 spin_unlock_bh include/linux/spinlock.h:362 [inline] __release_sock+0xce/0x350 net/core/sock.c:2277 release_sock+0x54/0x1b0 net/core/sock.c:2822 __tipc_sendstream+0x3e5/0x8c0 net/tipc/socket.c:1077 tipc_sendstream+0x4c/0x70 net/tipc/socket.c:1042 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 sock_write_iter+0x22c/0x370 net/socket.c:925 call_write_iter include/linux/fs.h:1780 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x44c/0x630 fs/read_write.c:482 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f1320bac0e9 RSP: 002b:00007f131f521168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f1320cbef60 RCX: 00007f1320bac0e9 RDX: 000000002000011a RSI: 0000000020000040 RDI: 0000000000000006 RBP: 00007f1320c0608d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffeee31806f R14: 00007f131f521300 R15: 0000000000022000 Code: 00 8b 14 24 49 8b 9b 78 08 00 00 85 d2 75 0f 48 85 db 41 bd 01 00 00 00 0f 85 05 0b 00 00 48 ba 00 00 00 00 00 fc ff df 4c 89 d1 <48> c1 e9 03 80 3c 11 00 0f 85 5f 25 00 00 48 8b 4c 24 18 49 89 ---------------- Code disassembly (best guess): 0: 0f 84 d3 00 00 00 je 0xd9 6: 49 89 dc mov %rbx,%r12 9: 49 89 de mov %rbx,%r14 c: 41 bd 01 00 00 00 mov $0x1,%r13d 12: 49 c1 ec 03 shr $0x3,%r12 16: 41 83 e6 07 and $0x7,%r14d 1a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 21: fc ff df 24: 49 01 c4 add %rax,%r12 27: eb 02 jmp 0x2b 29: f3 90 pause * 2b: 41 0f b6 04 24 movzbl (%r12),%eax <-- trapping instruction 30: 44 38 f0 cmp %r14b,%al 33: 7f 08 jg 0x3d 35: 84 c0 test %al,%al 37: 0f 85 f6 00 00 00 jne 0x133 3d: 0f b6 03 movzbl (%rbx),%eax