rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=cd6c/1/0x4000000000000000 softirq=11862/11864 fqs=2
	(t=10502 jiffies g=12493 q=447 ncpus=2)
rcu: rcu_preempt kthread starved for 10499 jiffies! g12493 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:27840 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </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: 5051 Comm: syz.1.219 Not tainted 6.1.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__lock_acquire+0x19c8/0x7c50 kernel/locking/lockdep.c:5053
Code: 00 74 12 4c 89 ff e8 57 db 6d 00 49 b8 00 00 00 00 00 fc ff df 4d 89 37 48 8b 44 24 70 42 0f b6 04 00 84 c0 0f 85 96 51 00 00 <8b> 03 ff c0 89 03 83 f8 30 0f 83 6b 40 00 00 c7 44 24 34 01 00 00
RSP: 0018:ffffc90000007a60 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff88807609e418 RCX: ffffffff8162fa00
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90ade248
RBP: ffffc90000007cb0 R08: dffffc0000000000 R09: fffffbfff215bc4a
R10: fffffbfff215bc4a R11: 1ffffffff215bc49 R12: ffffffff90a40d90
R13: 000000000000005f R14: abe92a66ad81a2ce R15: ffff88807609e410
FS:  00007f11d50446c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 00000000684c4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
 hrtimer_interrupt+0xf8/0x9c0 kernel/time/hrtimer.c:1859
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: f5 ff 0f 1f 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 fe f8 42 f7 48 89 df e8 56 be 43 f7 e8 61 b0 66 f7 fb bf 01 00 00 00 <e8> 06 3c 37 f7 65 8b 05 57 05 e2 75 85 c0 74 02 5b c3 e8 a4 16 e0
RSP: 0018:ffffc90004b5fbb8 EFLAGS: 00000286
RAX: 2f7f39c88c9b4600 RBX: ffff888078a2ae40 RCX: 2f7f39c88c9b4600
RDX: dffffc0000000000 RSI: ffffffff8a8c0420 RDI: 0000000000000001
RBP: ffff888078a2b2d8 R08: dffffc0000000000 R09: ffffed100f1455c9
R10: ffffed100f1455c9 R11: 1ffff1100f1455c8 R12: 1ffff1100f14565b
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x1163/0x1350 kernel/signal.c:2874
 arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f11d418ebe7
Code: ff ff 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
RSP: 002b:00007f11d50440e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f11d43b5fa8 RCX: 00007f11d418ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f11d43b5fa8
RBP: 00007f11d43b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f11d43b6038 R14: 00007ffdb3b6c870 R15: 00007ffdb3b6c958
 </TASK>
CPU: 1 PID: 5014 Comm: syz.0.208 Not tainted 6.1.148-syzkaller #0
sched: RT throttling activated
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: f5 ff 0f 1f 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 fe f8 42 f7 48 89 df e8 56 be 43 f7 e8 61 b0 66 f7 fb bf 01 00 00 00 <e8> 06 3c 37 f7 65 8b 05 57 05 e2 75 85 c0 74 02 5b c3 e8 a4 16 e0
RSP: 0018:ffffc900047efbb8 EFLAGS: 00000286
RAX: 897ee166788dd400 RBX: ffff888078a2b780 RCX: 897ee166788dd400
RDX: dffffc0000000000 RSI: ffffffff8a8c0420 RDI: 0000000000000001
RBP: ffff888078a2bc18 R08: dffffc0000000000 R09: ffffed100f1456f1
R10: ffffed100f1456f1 R11: 1ffff1100f1456f0 R12: 1ffff1100f145783
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f18bc9dd6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa2f39dae9c CR3: 00000000278aa000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x1163/0x1350 kernel/signal.c:2874
 arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f18bbb8ebe7
Code: ff ff 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
RSP: 002b:00007f18bc9dd038 EFLAGS: 00000246
RAX: 0000000000000048 RBX: 00007f18bbdb5fa0 RCX: 00007f18bbb8ebe9
RDX: 0000200000000380 RSI: 0000000000000026 RDI: 0000000000000004
RBP: 00007f18bbc11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f18bbdb6038 R14: 00007f18bbdb5fa0 R15: 00007ffd1fdb6038
 </TASK>