rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=353/1/0x4000000000000000 softirq=7252/7252 fqs=5248 
	(t=10501 jiffies g=8441 q=44518)
NMI backtrace for cpu 1
CPU: 1 PID: 4462 Comm: syz.0.16 Not tainted 5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x22f/0x380 kernel/rcu/tree_stall.h:349
 print_cpu_stall+0x31d/0x5f0 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+0x6d8/0x1110 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:1818
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1690 [inline]
 __hrtimer_run_queues+0x4fe/0xc40 kernel/time/hrtimer.c:1754
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1816
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:fpu__restore_sig+0x15d/0xf50 arch/x86/kernel/fpu/signal.c:456
Code: 42 0f b6 04 38 84 c0 0f 85 f0 09 00 00 45 8b 36 31 ff 44 89 f6 e8 23 fa 4b 00 45 85 f6 0f 84 d6 06 00 00 e8 b5 f6 4b 00 eb 05 <e8> ae f6 4b 00 44 89 ee 49 89 f6 4d 01 e6 41 0f 92 c7 41 f6 d7 4c
RSP: 0018:ffffc9000327fb40 EFLAGS: 00000246
RAX: ffffffff812bcb27 RBX: 0000000000000000 RCX: ffff88801ddabb80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000327fcf0 R08: dffffc0000000000 R09: fffff5200064ffc4
R10: 0000000000000000 R11: 0000000000000010 R12: 00007ffc2429f700
R13: 0000000000000344 R14: 0000000000000000 R15: dffffc0000000000
 restore_sigcontext arch/x86/kernel/signal.c:139 [inline]
 __ia32_sys_rt_sigreturn+0x649/0x790 arch/x86/kernel/signal.c:674
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f2e8d28c929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc2429fad8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f2e8d4b3fa8 RCX: 00007f2e8d28c929
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f2e8d4b3fac
RBP: 0000000000000000 R08: 0000679e1fd4aad8 R09: 000000072429fdcf
R10: 0000000000000005 R11: 0000000000000246 R12: 00007f2e8d4b3fac
R13: 00007f2e8d4b3fa0 R14: 0000000000000095 R15: 0000000000000003
 </TASK>
sched: RT throttling activated