rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=d27/1/0x4000000000000000 softirq=6836/6836 fqs=5248 
	(t=10501 jiffies g=7417 q=16698)
NMI backtrace for cpu 1
CPU: 1 PID: 4324 Comm: syz.0.16 Not tainted 5.15.186-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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x60 kernel/kcov.c:205
Code: 84 00 00 00 00 00 53 48 89 fb e8 17 00 00 00 48 8b 3d d0 ba f1 0b 48 89 de 5b e9 37 af 44 00 00 00 cc cc 00 00 cc 48 8b 04 24 <65> 48 8b 0d a4 ac 8a 7e 65 8b 15 a5 ac 8a 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc900032bfb10 EFLAGS: 00000293
RAX: ffffffff812bdc5a RBX: 00007ffff059cbc0 RCX: ffff88802812d940
RDX: 0000000000000000 RSI: 00007ffff059cf04 RDI: 00007ffffffff000
RBP: ffffc900032bfcb0 R08: dffffc0000000000 R09: ffffed1005025dda
R10: ffffed1005025dda R11: 1ffff11005025dd9 R12: dffffc0000000000
R13: 1ffff11005025e19 R14: 1ffff11005025b28 R15: ffff88802812d940
 local_bh_disable+0xa/0x20 include/linux/bottom_half.h:19
 fpregs_lock arch/x86/include/asm/fpu/api.h:70 [inline]
 copy_fpstate_to_sigframe+0x1fc/0xb90 arch/x86/kernel/fpu/signal.c:198
 get_sigframe arch/x86/kernel/signal.c:295 [inline]
 __setup_rt_frame arch/x86/kernel/signal.c:471 [inline]
 setup_rt_frame arch/x86/kernel/signal.c:780 [inline]
 handle_signal arch/x86/kernel/signal.c:824 [inline]
 arch_do_signal_or_restart+0x67a/0x1300 arch/x86/kernel/signal.c:869
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7ff76e391929
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:00007ffff059cf88 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007ff76e5b8fa8 RCX: 00007ff76e391929
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007ff76e5b8fac
RBP: 0000000000000000 R08: 0033a0fe365e42b8 R09: 00000007f059d27f
R10: 0000000000000005 R11: 0000000000000246 R12: 00007ff76e5b8fac
R13: 00007ff76e5b8fa0 R14: 0000000000000095 R15: 0000000000000003
 </TASK>