watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor833:8263] Modules linked in: irq event stamp: 5797 hardirqs last enabled at (5796): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (5797): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (254): [] read_pnet include/net/net_namespace.h:282 [inline] softirqs last enabled at (254): [] sock_net include/net/sock.h:2347 [inline] softirqs last enabled at (254): [] unix_create1+0x424/0x4f0 net/unix/af_unix.c:838 softirqs last disabled at (299): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (299): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 8263 Comm: syz-executor833 Not tainted 4.14.267-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880afb4a440 task.stack: ffff8880afd70000 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:ffff8880ba406f28 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e1279 RBX: ffff8880afb4a440 RCX: 0000000000000d7c RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286 RBP: ffff88809e752160 R08: ffffffff8b9a96a0 R09: 00000000000425cf R10: ffff8880afb4ae30 R11: ffff8880afb4a440 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 FS: 00005555570db300(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000080 CR3: 000000009b859000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] tcf_act_police+0x6c/0xd90 net/sched/act_police.c:209 tcf_action_exec net/sched/act_api.c:491 [inline] tcf_action_exec+0x13f/0x330 net/sched/act_api.c:471 tcf_exts_exec include/net/pkt_cls.h:223 [inline] route4_classify+0x708/0x1110 net/sched/cls_route.c:186 tcf_classify+0xfd/0x300 net/sched/cls_api.c:337 prio_classify net/sched/sch_prio.c:46 [inline] prio_enqueue+0x30c/0x670 net/sched/sch_prio.c:77 __dev_xmit_skb net/core/dev.c:3225 [inline] __dev_queue_xmit+0x121d/0x2480 net/core/dev.c:3489 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip_finish_output2+0x9db/0x1340 net/ipv4/ip_output.c:237 ip_finish_output+0x37c/0xc50 net/ipv4/ip_output.c:325 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip_output+0x1cd/0x510 net/ipv4/ip_output.c:413 dst_output include/net/dst.h:470 [inline] ip_local_out+0x93/0x170 net/ipv4/ip_output.c:125 iptunnel_xmit+0x5cc/0x950 net/ipv4/ip_tunnel_core.c:91 geneve_xmit_skb drivers/net/geneve.c:867 [inline] geneve_xmit+0xf15/0x2ca0 drivers/net/geneve.c:948 __netdev_start_xmit include/linux/netdevice.h:4052 [inline] netdev_start_xmit include/linux/netdevice.h:4061 [inline] xmit_one net/core/dev.c:3005 [inline] dev_hard_start_xmit+0x188/0x890 net/core/dev.c:3021 __dev_queue_xmit+0x1d7f/0x2480 net/core/dev.c:3521 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 dst_output include/net/dst.h:470 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] mld_sendpack+0x5fe/0xea0 net/ipv6/mcast.c:1657 mld_send_cr net/ipv6/mcast.c:1953 [inline] mld_ifc_timer_expire+0x57c/0xcd0 net/ipv6/mcast.c:2452 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:___might_sleep+0x10/0x2b0 kernel/sched/core.c:6006 RSP: 0018:ffff8880afd77a38 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: ffff8880afb4a440 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000001279 RDI: ffffffff87916300 RBP: ffffffff87916300 R08: 0000000000037b28 R09: 0000000000000008 R10: ffffffffffffffe8 R11: ffff8880afb4a440 R12: 0000000000001279 R13: ffffea00022d0000 R14: 0000000000000000 R15: dffffc0000000000 clear_huge_page+0xc4/0x7b0 mm/memory.c:4729 __do_huge_pmd_anonymous_page mm/huge_memory.c:574 [inline] do_huge_pmd_anonymous_page+0x93b/0x1700 mm/huge_memory.c:731 create_huge_pmd mm/memory.c:3984 [inline] __handle_mm_fault+0x2ac4/0x4620 mm/memory.c:4187 handle_mm_fault+0x455/0x9c0 mm/memory.c:4253 __do_page_fault+0x549/0xad0 arch/x86/mm/fault.c:1442 page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1123 RIP: 0010:__put_user_4+0x1c/0x30 arch/x86/lib/putuser.S:70 RSP: 0018:ffff8880afd77e50 EFLAGS: 00050293 RAX: 0000000000000004 RBX: 00007fffffffeffd RCX: 0000000020000080 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000286 RBP: 0000000000000004 R08: ffffffff8b9cc828 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8880afb4a440 R12: 1ffff11015faefcd R13: ffff8880a9b91340 R14: 0000000000000005 R15: ffff8880a893cd40 SYSC_socketpair net/socket.c:1423 [inline] SyS_socketpair+0x25e/0x480 net/socket.c:1366 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f9243500e99 RSP: 002b:00007ffff89fc198 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 00007ffff89fc1c0 RCX: 00007f9243500e99 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d R10: 0000000020000080 R11: 0000000000000246 R12: 00007ffff89fc1b0 R13: 00000000000f4240 R14: 0000000000012d96 R15: 00007ffff89fc1a4 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 f9 bb 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 ---------------- 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 f9 bb ae 07 cmpq $0x0,0x7aebbf9(%rip) # 0x7aebc17 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