rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10501 ticks this GP) idle=321/1/0x4000000000000000 softirq=6274/6274 fqs=0 
	(t=10502 jiffies g=5421 q=207)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g5421 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=1749
rcu: rcu_preempt kthread starved for 10505 jiffies! g5421 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:27000 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1f0 kernel/sched/core.c:6459
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x2bf/0x1080 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2145
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 1
CPU: 1 PID: 3686 Comm: syz-executor.4 Not tainted 5.15.159-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:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_check_gp_kthread_starvation+0x1d2/0x240 kernel/rcu/tree_stall.h:487
 print_cpu_stall+0x31b/0x600 kernel/rcu/tree_stall.h:631
 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline]
 rcu_pending kernel/rcu/tree.c:3932 [inline]
 rcu_sched_clock_irq+0x8d9/0x1150 kernel/rcu/tree.c:2619
 update_process_times+0x196/0x200 kernel/time/timer.c:1818
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x386/0x550 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1686 [inline]
 __hrtimer_run_queues+0x55b/0xcf0 kernel/time/hrtimer.c:1750
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:copy_user_generic arch/x86/include/asm/uaccess_64.h:46 [inline]
RIP: 0010:raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
RIP: 0010:_copy_from_user+0xf9/0x170 lib/usercopy.c:23
Code: 01 e0 72 63 4c 39 e8 77 5e e8 b3 7f 77 fd 0f ae e8 4c 89 f7 44 89 e6 e8 55 4f c1 fd 4c 89 f7 44 89 e2 4c 89 fe e8 a7 b4 27 00 <89> c3 31 ff 48 89 de e8 6b 83 77 fd 48 85 db 75 12 e8 81 7f 77 fd
RSP: 0018:ffffc900012efc30 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007efc4278fc28 RCX: 0000000000000000
RDX: 00000000000000c0 RSI: 00007efc4278fc28 RDI: ffffc900012efd80
RBP: ffffc900012efe50 R08: dffffc0000000000 R09: fffff5200025dfb0
R10: 0000000000000000 R11: dffffc0000000001 R12: 00000000000000c0
R13: 00007ffffffff000 R14: ffffc900012efcc0 R15: 00007efc4278fb68
 copy_from_user include/linux/uaccess.h:192 [inline]
 restore_sigcontext+0xce/0x710 arch/x86/kernel/signal.c:91
 __do_sys_rt_sigreturn+0x190/0x250 arch/x86/kernel/signal.c:674
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7efc441e0339
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007efc4278fb40 EFLAGS: 00000206 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007efc4434bf80 RCX: 00007efc441e0339
RDX: 00007efc4278fb40 RSI: 00007efc4278fc70 RDI: 0000000000000021
RBP: 00007efc4426949e R08: 0000000008000f28 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007efc4434bf80 R15: 00007ffea9cf8de8
 </TASK>
NMI backtrace for cpu 1
CPU: 1 PID: 3686 Comm: syz-executor.4 Not tainted 5.15.159-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:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x223/0x390 kernel/rcu/tree_stall.h:349
 print_cpu_stall+0x320/0x600 kernel/rcu/tree_stall.h:633
 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline]
 rcu_pending kernel/rcu/tree.c:3932 [inline]
 rcu_sched_clock_irq+0x8d9/0x1150 kernel/rcu/tree.c:2619
 update_process_times+0x196/0x200 kernel/time/timer.c:1818
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x386/0x550 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1686 [inline]
 __hrtimer_run_queues+0x55b/0xcf0 kernel/time/hrtimer.c:1750
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:copy_user_generic arch/x86/include/asm/uaccess_64.h:46 [inline]
RIP: 0010:raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
RIP: 0010:_copy_from_user+0xf9/0x170 lib/usercopy.c:23
Code: 01 e0 72 63 4c 39 e8 77 5e e8 b3 7f 77 fd 0f ae e8 4c 89 f7 44 89 e6 e8 55 4f c1 fd 4c 89 f7 44 89 e2 4c 89 fe e8 a7 b4 27 00 <89> c3 31 ff 48 89 de e8 6b 83 77 fd 48 85 db 75 12 e8 81 7f 77 fd
RSP: 0018:ffffc900012efc30 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007efc4278fc28 RCX: 0000000000000000
RDX: 00000000000000c0 RSI: 00007efc4278fc28 RDI: ffffc900012efd80
RBP: ffffc900012efe50 R08: dffffc0000000000 R09: fffff5200025dfb0
R10: 0000000000000000 R11: dffffc0000000001 R12: 00000000000000c0
R13: 00007ffffffff000 R14: ffffc900012efcc0 R15: 00007efc4278fb68
 copy_from_user include/linux/uaccess.h:192 [inline]
 restore_sigcontext+0xce/0x710 arch/x86/kernel/signal.c:91
 __do_sys_rt_sigreturn+0x190/0x250 arch/x86/kernel/signal.c:674
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7efc441e0339
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007efc4278fb40 EFLAGS: 00000206 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007efc4434bf80 RCX: 00007efc441e0339
RDX: 00007efc4278fb40 RSI: 00007efc4278fc70 RDI: 0000000000000021
RBP: 00007efc4426949e R08: 0000000008000f28 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007efc4434bf80 R15: 00007ffea9cf8de8
 </TASK>
sched: RT throttling activated