netlink: 4 bytes leftover after parsing attributes in process `syz-executor2'. random: crng init done INFO: rcu_sched self-detected stall on CPU 1-...!: (121515 ticks this GP) idle=e7e/1/4611686018427387908 softirq=31362/31362 fqs=7 (t=125000 jiffies g=16439 c=16438 q=668508) rcu_sched kthread starved for 124958 jiffies! g16439 c16438 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 RCU grace-period kthread stack dump: rcu_sched R running task 23768 9 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2848 [inline] __schedule+0x801/0x1e30 kernel/sched/core.c:3490 schedule+0xef/0x430 kernel/sched/core.c:3549 schedule_timeout+0x138/0x240 kernel/time/timer.c:1801 rcu_gp_kthread+0x6b5/0x1940 kernel/rcu/tree.c:2231 kthread+0x345/0x410 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 NMI backtrace for cpu 1 CPU: 1 PID: 4488 Comm: syz-fuzzer Not tainted 4.17.0-rc4+ #45 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:156 [inline] rcu_dump_cpu_stacks+0x175/0x1c2 kernel/rcu/tree.c:1376 print_cpu_stall kernel/rcu/tree.c:1525 [inline] check_cpu_stall.isra.61.cold.80+0x36c/0x59a kernel/rcu/tree.c:1593 __rcu_pending kernel/rcu/tree.c:3356 [inline] rcu_pending kernel/rcu/tree.c:3401 [inline] rcu_check_callbacks+0x21b/0xad0 kernel/rcu/tree.c:2763 update_process_times+0x2d/0x70 kernel/time/timer.c:1636 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0x3e3/0x10a0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 RIP: 0010:rcu_is_watching+0x6/0x140 kernel/rcu/tree.c:1071 RSP: 0000:ffff8801daf06620 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: ffff8801ad526240 RBX: 0000000000000000 RCX: ffffffff86444456 RDX: 0000000000000100 RSI: ffffffff864444b8 RDI: 0000000000000001 RBP: ffff8801daf06628 R08: ffff8801ad526240 R09: 0000000000000002 R10: ffff8801ad526240 R11: 0000000000000000 R12: 1ffff1003b5e0cca R13: ffff88008ff1a100 R14: 0000000000000000 R15: ffff8801daf066d0 rcu_read_unlock include/linux/rcupdate.h:684 [inline] ip_route_output_key_hash+0x2cd/0x390 net/ipv4/route.c:2303 __ip_route_output_key include/net/route.h:124 [inline] ip_route_output_flow+0x28/0xc0 net/ipv4/route.c:2557 ip_route_output_key include/net/route.h:134 [inline] sctp_v4_get_dst+0x50e/0x17a0 net/sctp/protocol.c:447 sctp_transport_route+0x132/0x360 net/sctp/transport.c:303 sctp_packet_config+0x926/0xdd0 net/sctp/output.c:118 sctp_outq_select_transport+0x2bb/0x9c0 net/sctp/outqueue.c:877 sctp_outq_flush_ctrl.constprop.12+0x2ad/0xe60 net/sctp/outqueue.c:911 sctp_outq_flush+0x2ef/0x3430 net/sctp/outqueue.c:1203 sctp_outq_uncork+0x6a/0x80 net/sctp/outqueue.c:776 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1820 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline] sctp_do_sm+0x596/0x7160 net/sctp/sm_sideeffect.c:1191 sctp_generate_heartbeat_event+0x218/0x450 net/sctp/sm_sideeffect.c:406 call_timer_fn+0x230/0x940 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0x79e/0xc50 kernel/time/timer.c:1666 run_timer_softirq+0x4c/0x70 kernel/time/timer.c:1692 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285 invoke_softirq kernel/softirq.c:365 [inline] irq_exit+0x1d1/0x200 kernel/softirq.c:405 exiting_irq arch/x86/include/asm/apic.h:525 [inline] smp_apic_timer_interrupt+0x17e/0x710 arch/x86/kernel/apic/apic.c:1052 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 RIP: 0033:0x40b55d RSP: 002b:000000c424bedca8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: 000000c4244e5470 RBX: 000000004d36768c RCX: 0000000000000000 RDX: 000000c4244e5470 RSI: 000000000000ffff RDI: 0000000000000000 RBP: 000000c424bedcc0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000009466f2 R11: 0000000000000004 R12: 0000000000000000 R13: 0000000000000020 R14: 0000000000000013 R15: 0000000000000034 BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 125s! BUG: workqueue lockup - pool cpus=0-1 flags=0x4 nice=0 stuck for 125s! Showing busy workqueues and worker pools: workqueue events: flags=0x0 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=3/256 in-flight: 2104:do_numa_crng_init pending: drbg_async_seed, cache_reap pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=9/256 pending: defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, check_corruption, vmstat_shepherd, cache_reap workqueue events_power_efficient: flags=0x80 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 pending: do_cache_clean pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256 pending: check_lifetime, gc_worker workqueue writeback: flags=0x4e pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/256 in-flight: 6:wb_workfn workqueue ipv6_addrconf: flags=0x40008 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1 pending: addrconf_verify_work workqueue krdsd: flags=0xe000a pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 in-flight: 43:rds_connect_worker pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=0s workers=4 idle: 24 1980 18 pool 4: cpus=0-1 flags=0x4 nice=0 hung=0s workers=7 idle: 22 8018 287 6751 89