IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
rcu: INFO: rcu_sched self-detected stall on CPU
rcu: 	1-...!: (10000 ticks this GP) idle=392/1/0x4000000000000002 softirq=7543/7549 fqs=1 
rcu: 	 (t=10001 jiffies g=777 q=1448)
rcu: rcu_sched kthread starved for 9999 jiffies! g777 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_sched       R  running task    14552    10      2 0x80080000
Call Trace:
 context_switch kernel/sched/core.c:2825 [inline]
 __schedule+0x2dc/0x860 kernel/sched/core.c:3473
 schedule+0x27/0x80 kernel/sched/core.c:3517
 schedule_timeout+0x1f3/0x4a0 kernel/time/timer.c:1804
 rcu_gp_kthread+0x417/0x7e0 kernel/rcu/tree.c:2194
 kthread+0x119/0x130 kernel/kthread.c:246
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:413
NMI backtrace for cpu 1
CPU: 1 PID: 4969 Comm: syz-executor.1 Not tainted 4.19.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x87/0xba lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.0+0x14/0x53 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x9c/0x9e 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:162 [inline]
 rcu_dump_cpu_stacks+0x9c/0xce kernel/rcu/tree.c:1340
 print_cpu_stall kernel/rcu/tree.c:1478 [inline]
 check_cpu_stall kernel/rcu/tree.c:1550 [inline]
 __rcu_pending kernel/rcu/tree.c:3276 [inline]
 rcu_pending kernel/rcu/tree.c:3319 [inline]
 rcu_check_callbacks.cold.61+0x20c/0x363 kernel/rcu/tree.c:2665
 update_process_times+0x2a/0x60 kernel/time/timer.c:1636
 tick_sched_handle.isra.6+0x20/0x60 kernel/time/tick-sched.c:164
 tick_sched_timer+0x3c/0x80 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0x124/0x2e0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0xf1/0x200 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1029 [inline]
 smp_apic_timer_interrupt+0x6d/0x160 arch/x86/kernel/apic/apic.c:1054
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864
 </IRQ>
RIP: 0033:0x7fa3c9da6270
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d 9a 84 04 00 e8 25 78 fa ff 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <83> ff 21 74 0b c3 66 2e 0f 1f 84 00 00 00 00 00 55 53 48 89 f3 48
RSP: 002b:00007fa3c9900bb8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 00007fa3c9e9df88 RCX: 00007fa3c9d7eae9
RDX: 00007fa3c9900bc0 RSI: 00007fa3c9900cf0 RDI: 0000000000000021
RBP: 00007fa3c9e9df80 R08: 00007fa3c99016c0 R09: 00007fa3c99016c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa3c9e9df8c
R13: 0000000000000006 R14: 00007ffcd3e0a130 R15: 00007ffcd3e0a218