rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=1cb/1/0x4000000000000000 softirq=7898/7908 fqs=1 
	(t=10500 jiffies g=7733 q=115)
rcu: rcu_preempt kthread starved for 10498 jiffies! g7733 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:26712 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 schedule+0x11b/0x1f0 kernel/sched/core.c:6456
 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:287
 </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: 4174 Comm: syz-executor.0 Not tainted 5.15.168-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:validate_chain+0xd0/0x5930 kernel/locking/lockdep.c:3755
Code: 89 44 21 23 48 89 8c 24 98 00 00 00 42 c6 44 21 2b f3 48 89 b4 24 a8 00 00 00 4c 8d 6e 20 4c 89 e8 48 c1 e8 03 48 89 44 24 60 <42> 0f b6 04 20 84 c0 0f 85 ab 46 00 00 41 8b 5d 00 89 d8 25 00 80
RSP: 0018:ffffc90002ef7980 EFLAGS: 00000802
RAX: 1ffff11004778c8a RBX: ffffffff8f8fb8c0 RCX: 1ffff920005def50
RDX: 0000000000000001 RSI: ffff888023bc6430 RDI: ffff888023bc5940
RBP: ffffc90002ef7c30 R08: dffffc0000000000 R09: fffffbfff1f82423
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff888023bc6450 R14: b58c8e46b52e12f9 R15: ffff888023bc6450
FS:  00007f2f0b2d96c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2f0b2d8d80 CR3: 0000000062bef000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
 do_write_seqcount_begin_nested include/linux/seqlock.h:519 [inline]
 do_write_seqcount_begin include/linux/seqlock.h:545 [inline]
 vtime_user_enter+0x97/0x2d0 kernel/sched/cputime.c:715
 __context_tracking_enter+0x5f/0x90 kernel/context_tracking.c:82
 user_enter_irqoff include/linux/context_tracking.h:41 [inline]
 __exit_to_user_mode kernel/entry/common.c:136 [inline]
 syscall_exit_to_user_mode+0x1d1/0x240 kernel/entry/common.c:309
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f2f0bf7f470
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d 9a 93 04 00 e8 25 78 fa ff 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <83> ff 21 74 0b c3 66 2e 0f 1f 84 00 00 00 00 00 55 53 48 89 f3 48
RSP: 002b:00007f2f0b2d8bb8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f2f0c076f88 RCX: 00007f2f0bf57ce9
RDX: 00007f2f0b2d8bc0 RSI: 00007f2f0b2d8cf0 RDI: 0000000000000021
RBP: 00007f2f0c076f80 R08: 00007f2f0b2d96c0 R09: 00007f2f0b2d96c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2f0c076f8c
R13: 000000000000000b R14: 00007fff185965d0 R15: 00007fff185966b8
 </TASK>
NMI backtrace for cpu 1
CPU: 1 PID: 4170 Comm: syz-executor.4 Not tainted 5.15.168-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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:1688 [inline]
 __hrtimer_run_queues+0x55b/0xcf0 kernel/time/hrtimer.c:1752
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1814
 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
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1096 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1096
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:93 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x37/0x240 kernel/entry/common.c:114
Code: 49 89 fe 48 8b 7c 24 30 e8 46 f6 ff ff e9 8d 01 00 00 e9 91 01 00 00 e8 b7 b9 66 f7 e8 a2 b7 66 f7 fb 65 4c 8b 3d d9 35 e2 75 <49> 8b 5f 08 f6 c3 3f 0f 84 ce 00 00 00 f6 c3 20 74 17 4c 89 f7 e8
RSP: 0018:ffffc90002f17ef8 EFLAGS: 00000282
RAX: 77b30ddcda999800 RBX: ffffc90002f17f30 RCX: ffffffff913f5f03
RDX: dffffc0000000000 RSI: ffffffff8a8b2a80 RDI: ffffffff8ad90240
RBP: ffffc90002f17f48 R08: ffffffff8186f1b0 R09: fffffbfff1bc925e
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000027 R14: ffffc90002f17f58 R15: ffff888023bc0000
 do_syscall_64+0x1e/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f4148ae1467
Code: 0b e9 68 fe ff ff 48 83 c4 18 48 8d 3d f2 03 c5 00 5b 5d 41 5c 41 5d 41 5e 41 5f e9 b3 68 fd ff 0f 1f 00 b8 27 00 00 00 0f 05 <c3> 0f 1f 84 00 00 00 00 00 b8 66 00 00 00 0f 05 c3 0f 1f 84 00 00
RSP: 002b:00007f4147e64b88 EFLAGS: 00000206 ORIG_RAX: 0000000000000027
RAX: ffffffffffffffda RBX: 00007f4147e64cf0 RCX: 00007f4148ae1467
RDX: 00007f4147e64bc0 RSI: 00007f4147e64cf0 RDI: 0000000000000021
RBP: 0000000000000000 R08: 00007f4147e656c0 R09: 00007f4147e656c0
R10: 0000000000000000 R11: 0000000000000206 R12: 00007f4148c02f8c
R13: 000000000000000b R14: 00007ffe73061110 R15: 00007ffe730611f8
 </TASK>
sched: RT throttling activated