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: 	0-...!: (9999 ticks this GP) idle=31a/1/0x4000000000000002 softirq=6409/6418 fqs=0 
rcu: 	 (t=10001 jiffies g=1481 q=669)
rcu: rcu_sched kthread starved for 10002 jiffies! g1481 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_sched       R  running task    14848    10      2 0x80080000
Call Trace:
 context_switch kernel/sched/core.c:2825 [inline]
 __schedule+0x2e2/0x870 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+0x11c/0x140 kernel/kthread.c:246
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:413
NMI backtrace for cpu 0
CPU: 0 PID: 4511 Comm: syz-executor.2 Not tainted 4.19.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
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+0x126/0x2f0 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+0x79/0x170 arch/x86/kernel/apic/apic.c:1054
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864
 </IRQ>
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:do_syscall_64+0x2c/0x170 arch/x86/entry/common.c:278
Code: 89 e5 41 54 49 89 f4 53 48 89 fb e9 de 00 00 00 e9 14 01 00 00 48 83 3d 49 7a a8 01 00 0f 84 3c 01 00 00 fb 66 0f 1f 44 00 00 <65> 48 8b 04 25 00 4f 01 00 48 8b 00 a9 c1 01 08 10 0f 85 f7 00 00
RSP: 0018:ffffc9000199ff38 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000027 RCX: ffffc9000199fea4
RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000082
RBP: ffffc9000199ff48 R08: 00000026191d34a4 R09: 000000005a329243
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000199ff58
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f127481d627
Code: 0b e9 68 fe ff ff 48 83 c4 18 48 8d 3d 32 f2 c5 00 5b 5d 41 5c 41 5d 41 5e 41 5f e9 c3 68 fd ff 0f 1f 00 b8 27 00 00 00 0f 05 <c3> 0f 1f 84 00 00 00 00 00 b8 66 00 00 00 0f 05 c3 0f 1f 84 00 00
RSP: 002b:00007f12743a0b88 EFLAGS: 00000206 ORIG_RAX: 0000000000000027
RAX: ffffffffffffffda RBX: 00007f12743a0cf0 RCX: 00007f127481d627
RDX: 00007f12743a0bc0 RSI: 00007f12743a0cf0 RDI: 0000000000000021
RBP: 0000000000000000 R08: 00007f12743a16c0 R09: 00007f12743a16c0
R10: 0000000000000000 R11: 0000000000000206 R12: 00007f127494df8c
R13: 0000000000000006 R14: 00007fff493607d0 R15: 00007fff493608b8