rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=66f/1/0x4000000000000000 softirq=10973/10974 fqs=12 
	(t=10502 jiffies g=12633 q=299)
rcu: rcu_preempt kthread starved for 10478 jiffies! g12633 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:R  running task     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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4857 Comm: syz-executor.4 Not tainted 5.15.156-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x13/0x60 kernel/kcov.c:197
Code: 48 8b 3d 48 00 64 0c 48 89 de 5b e9 a7 ed 48 00 cc cc cc cc cc cc cc 48 8b 04 24 65 48 8b 0d d4 12 82 7e 65 8b 15 d5 12 82 7e <f7> c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74 35 83 b9 34 16 00 00
RSP: 0018:ffffc900040c7a58 EFLAGS: 00000202
RAX: ffffffff812f0a0d RBX: 0000000000000001 RCX: ffff88801ff68000
RDX: 0000000080000200 RSI: ffffffff8ad8f360 RDI: ffffffff8ad8f320
RBP: ffffc900040c7c01 R08: ffffffff812f09fa R09: fffffbfff1bc8b5e
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 1ffff11003fed2f1 R14: ffff88801ff68000 R15: dffffc0000000000
FS:  00005555572b6480(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa7b7d30d80 CR3: 000000001c40e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 trace_x86_fpu_regs_activated arch/x86/include/asm/trace/fpu.h:57 [inline]
 fpregs_activate+0x8d/0x1c0 arch/x86/include/asm/fpu/internal.h:451
 fpregs_mark_activate+0x23/0x80 arch/x86/kernel/fpu/core.c:429
 restore_fpregs_from_user arch/x86/kernel/fpu/signal.c:299 [inline]
 __fpu_restore_sig arch/x86/kernel/fpu/signal.c:334 [inline]
 fpu__restore_sig+0x83c/0x1100 arch/x86/kernel/fpu/signal.c:466
 restore_sigcontext+0x638/0x710 arch/x86/kernel/signal.c:139
 __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: 0033:0x7fa7b97dfea9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe25916858 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000032 RCX: 00007fa7b97dfea9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fa7b990e05c
RBP: 00007fa7b990e05c R08: 0000000000000010 R09: 00007ffe25916880
R10: 00007ffe259169e0 R11: 0000000000000246 R12: 0000000000017910
R13: 00000000000178de R14: 00007ffe25916a00 R15: 00007fa7b9796cb0
 </TASK>
NMI backtrace for cpu 1
CPU: 1 PID: 4850 Comm: syz-executor.2 Not tainted 5.15.156-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
sched: RT throttling activated
 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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 91 80 f6 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 be b4 3b f7 48 89 df e8 96 08 3d f7 e8 b1 bf 5f f7 fb bf 01 00 00 00 <e8> b6 44 30 f7 65 8b 05 87 52 db 75 85 c0 74 02 5b c3 e8 f4 70 d9
RSP: 0018:ffffc90004117bc0 EFLAGS: 00000282
RAX: 0ced8055ca2ffe00 RBX: ffff888060a19bc0 RCX: ffffffff913edf03
RDX: dffffc0000000000 RSI: ffffffff8a8b2980 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff8186dd10 R09: ffffed100c143379
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000021
R13: dffffc0000000000 R14: ffff888060a1a058 R15: ffff888060a19bc0
 spin_unlock_irq include/linux/spinlock.h:413 [inline]
 get_signal+0x13ee/0x14e0 kernel/signal.c:2892
 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x97/0x130 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+0x5d/0x240 kernel/entry/common.c:307
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f0cc68fba10
Code: 24 eb bf 48 39 f2 72 97 48 39 f0 73 46 49 89 34 24 48 89 ce 48 89 4f f8 49 8b 14 24 49 8b 4c 24 08 eb 85 0f 1f 80 00 00 00 00 <48> 89 fe 4c 89 ea 48 89 df e8 f2 fe ff ff 48 89 d8 4c 29 e0 48 3d
RSP: 002b:00007ffc946cbde0 EFLAGS: 00000212
RAX: 00007f0cc62fbec8 RBX: 00007f0cc62fbed0 RCX: ffffffff81742c67
RDX: ffffffff8174273c RSI: ffffffff81741fe0 RDI: 00007f0cc62ff6d0
RBP: 00007f0cc62fa220 R08: 00007f0cc62fcc70 R09: 00000000000002ca
R10: 0000000081840b89 R11: 0000000000004490 R12: 00007f0cc62fa218
R13: 000000000000001c R14: 00007f0cc6a62000 R15: 00007f0cc6a6e018
 </TASK>