watchdog: BUG: soft lockup - CPU#0 stuck for 134s! [syz-executor5:9791] Modules linked in: irq event stamp: 29049627 hardirqs last enabled at (29049626): [] restore_regs_and_return_to_kernel+0x0/0x26 hardirqs last disabled at (29049627): [] apic_timer_interrupt+0x98/0xb0 arch/x86/entry/entry_64.S:791 softirqs last enabled at (2020): [] rcu_read_unlock_bh include/linux/rcupdate.h:723 [inline] softirqs last enabled at (2020): [] ip6_finish_output2+0xaf3/0x2310 net/ipv6/ip6_output.c:121 softirqs last disabled at (2021): [] do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:978 CPU: 0 PID: 9791 Comm: syz-executor5 Not tainted 4.14.0+ #126 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801cb70a080 task.stack: ffff8801b3500000 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:777 [inline] RIP: 0010:lock_is_held_type+0x18b/0x210 kernel/locking/lockdep.c:4044 RSP: 0018:ffff8801db405ed0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11 RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 0000000000000000 RDX: 1ffffffff0bd96a9 RSI: ffffffff85f3c000 RDI: 0000000000000286 RBP: ffff8801db405ef0 R08: 0000000000000007 R09: 0000000000000002 R10: 0000000000000000 R11: ffffffff87469d60 R12: ffff8801cb70a080 R13: 0000000000000000 R14: ffff8801d1a6f6b0 R15: ffff8801ca813800 FS: 00007fd7142c2700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020f01ff0 CR3: 00000001c70c6000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:437 [inline] rcu_read_lock_sched_held+0x108/0x120 kernel/rcu/update.c:117 trace_fib_table_lookup include/trace/events/fib.h:13 [inline] fib_table_lookup+0x15c2/0x1a30 net/ipv4/fib_trie.c:1309 fib4_rule_action+0x195/0x2a0 net/ipv4/fib_rules.c:135 fib_rules_lookup+0x38d/0x9d0 net/core/fib_rules.c:279 __fib_lookup+0x167/0x200 net/ipv4/fib_rules.c:93 fib_lookup include/net/ip_fib.h:314 [inline] ip_route_output_key_hash_rcu+0x13bd/0x2c20 net/ipv4/route.c:2406 ip_route_output_key_hash+0x20b/0x370 net/ipv4/route.c:2299 __ip_route_output_key include/net/route.h:125 [inline] ip_route_output_flow+0x26/0xa0 net/ipv4/route.c:2553 ip_route_output_key include/net/route.h:135 [inline] sctp_v4_get_dst+0xeaf/0x1650 net/sctp/protocol.c:513 sctp_transport_route+0xa8/0x430 net/sctp/transport.c:284 sctp_packet_config+0x869/0xc80 net/sctp/output.c:106 sctp_outq_flush+0x7c7/0x4050 net/sctp/outqueue.c:890 sctp_outq_uncork+0x5a/0x70 net/sctp/outqueue.c:772 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1822 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1222 [inline] sctp_do_sm+0x50e/0x6a30 net/sctp/sm_sideeffect.c:1193 sctp_generate_heartbeat_event+0x295/0x3f0 net/sctp/sm_sideeffect.c:406 call_timer_fn+0x246/0x850 kernel/time/timer.c:1312 expire_timers kernel/time/timer.c:1351 [inline] __run_timers+0x7fd/0xb90 kernel/time/timer.c:1654 run_timer_softirq+0x4c/0xb0 kernel/time/timer.c:1680 __do_softirq+0x29d/0xbb2 kernel/softirq.c:285 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:978 do_softirq.part.19+0x14d/0x190 kernel/softirq.c:329 do_softirq kernel/softirq.c:177 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:182 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:727 [inline] ip6_finish_output2+0xb26/0x2310 net/ipv6/ip6_output.c:121 ip6_finish_output+0x2f9/0x920 net/ipv6/ip6_output.c:146 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x1eb/0x840 net/ipv6/ip6_output.c:163 dst_output include/net/dst.h:460 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] ip6_xmit+0xf2f/0x1f90 net/ipv6/ip6_output.c:261 sctp_v6_xmit+0x438/0x630 net/sctp/ipv6.c:225 sctp_packet_transmit+0x2258/0x3750 net/sctp/output.c:637 sctp_outq_flush+0x1216/0x4050 net/sctp/outqueue.c:1191 sctp_outq_uncork+0x5a/0x70 net/sctp/outqueue.c:772 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1822 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1222 [inline] sctp_do_sm+0x50e/0x6a30 net/sctp/sm_sideeffect.c:1193 sctp_assoc_bh_rcv+0x283/0x4b0 net/sctp/associola.c:1065 sctp_inq_push+0x23b/0x300 net/sctp/inqueue.c:95 sctp_backlog_rcv+0x177/0xaa0 net/sctp/input.c:350 sk_backlog_rcv include/net/sock.h:911 [inline] __release_sock+0x124/0x360 net/core/sock.c:2264 release_sock+0xa4/0x2a0 net/core/sock.c:2779 sctp_wait_for_connect+0x346/0x570 net/sctp/socket.c:8150 sctp_sendmsg+0x2977/0x3300 net/sctp/socket.c:2046 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763 sock_sendmsg_nosec net/socket.c:632 [inline] sock_sendmsg+0xca/0x110 net/socket.c:642 SYSC_sendto+0x358/0x5a0 net/socket.c:1749 SyS_sendto+0x40/0x50 net/socket.c:1717 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452879 RSP: 002b:00007fd7142c1be8 EFLAGS: 00000212 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452879 RDX: 0000000000034000 RSI: 0000000020832000 RDI: 0000000000000018 RBP: 0000000000000086 R08: 00000000205e4fe4 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f1888 R13: 00000000ffffffff R14: 00007fd7142c26d4 R15: 0000000000000000 Code: fc ff df 41 c7 84 24 84 08 00 00 00 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 75 63 48 83 3d 54 f1 97 04 00 74 30 48 89 df 57 9d <0f> 1f 44 00 00 48 83 c4 08 44 89 e8 5b 41 5c 41 5d 5d c3 48 83