rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10510 ticks this GP) idle=d83/1/0x4000000000000000 softirq=6327/6329 fqs=5250 
	(t=10501 jiffies g=5785 q=18669)
NMI backtrace for cpu 1
CPU: 1 PID: 4338 Comm: syz.0.16 Not tainted 5.15.189-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:3936 [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:lock_acquire+0xd5/0x3f0 kernel/locking/lockdep.c:5596
Code: 3c c5 a8 6e 69 8d be 08 00 00 00 e8 b5 32 60 00 44 89 f0 48 0f a3 05 62 78 0d 0c 73 0d e8 53 b6 07 00 84 c0 0f 84 17 02 00 00 <48> c7 c0 44 a2 69 8d 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 06 02
RSP: 0018:ffffc9000430f9e0 EFLAGS: 00000202
RAX: 0000000000009d01 RBX: 0000000000000000 RCX: 913eb013c94cfc00
RDX: 0000000000000000 RSI: ffffffff8a599320 RDI: ffffffff8a5992e0
RBP: ffffc9000430faf8 R08: dffffc0000000000 R09: fffffbfff1ad2dd6
R10: fffffbfff1ad2dd6 R11: 1ffffffff1ad2dd5 R12: ffff88802b4d0828
R13: 1ffff92000861f48 R14: 0000000000000001 R15: dffffc0000000000
 __might_fault+0xb3/0x110 mm/memory.c:5357
 __copy_from_user include/linux/uaccess.h:109 [inline]
 check_xstate_in_sigframe arch/x86/kernel/fpu/signal.c:33 [inline]
 __fpu_restore_sig arch/x86/kernel/fpu/signal.c:317 [inline]
 fpu__restore_sig+0x203/0xf50 arch/x86/kernel/fpu/signal.c:466
 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: 0033:0x7faa2690a9a9
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:00007ffc089a0d98 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007faa26b31fa8 RCX: 00007faa2690a9a9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007faa26b31fac
RBP: 0000000000000000 R08: 002cc20a9d44094c R09: 00000007089a108f
R10: 0000000000000005 R11: 0000000000000246 R12: 00007faa26b31fac
R13: 00007faa26b31fa0 R14: 0000000000000095 R15: 0000000000000003
 </TASK>