rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=841c/1/0x4000000000000000 softirq=90114/90115 fqs=2
	(t=10501 jiffies g=132277 q=176 ncpus=2)
rcu: rcu_preempt kthread starved for 10498 jiffies! g132277 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+0x10e9/0x40d0 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: 17377 Comm: syz.6.3270 Not tainted 6.1.135-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:kvm_sched_clock_read+0x24/0x40 arch/x86/kernel/kvmclock.c:91
Code: 00 00 00 00 66 90 65 ff 05 b1 7c ca 7e 65 48 8b 3d f1 81 ca 7e e8 ac 05 00 00 65 ff 0d 9d 7c ca 7e 74 08 48 2b 05 e4 0d 05 0b <c3> e8 fe 8d c8 ff 48 2b 05 d7 0d 05 0b c3 00 00 cc cc 00 00 cc cc
RSP: 0018:ffffc90000007ef8 EFLAGS: 00000016
RAX: 0000017d9730a2f5 RBX: ffffc90000007f40 RCX: 0000000000000001
RDX: 1ffffffff1ef9800 RSI: ffffffff8f7cc01c RDI: ffffffff8f7cc000
RBP: ffffc90000007fb0 R08: ffffffff8f7cc008 R09: ffffffff8f7cc018
R10: ffffffff8f7cc010 R11: ffffffff8f7cc003 R12: dffffc0000000000
R13: dffffc0000000000 R14: 1ffff92000000fe4 R15: ffffffff8c3cf970
FS:  00007f6903c986c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 00000000663c7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 sched_clock_cpu+0x6e/0x250 kernel/sched/clock.c:369
 irqtime_account_irq+0x6a/0x1b0 kernel/sched/cputime.c:60
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x93/0xc0 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 4e 5b 4a f7 48 89 df e8 a6 20 4b f7 e8 b1 22 6e f7 fb bf 01 00 00 00 <e8> b6 9d 3e f7 65 8b 05 b7 72 e9 75 85 c0 74 02 5b c3 e8 04 84 e7
RSP: 0018:ffffc9000cd07bb8 EFLAGS: 00000286
RAX: f15d981dfa279c00 RBX: ffff8880583dc0c0 RCX: f15d981dfa279c00
RDX: dffffc0000000000 RSI: ffffffff8a6bff00 RDI: 0000000000000001
RBP: ffff8880583dc558 R08: dffffc0000000000 R09: ffffed100b07b819
R10: ffffed100b07b819 R11: 1ffff1100b07b818 R12: 1ffff1100b07b8ab
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: 0033:0x7f6902d8e967
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:00007f6903c98038 EFLAGS: 00000246
RAX: 0000000000000113 RBX: 00007f6902fb5fa0 RCX: 00007f6902d8e969
RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f6902e10ab1 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6902fb5fa0 R15: 00007ffcad798668
 </TASK>
CPU: 1 PID: 17383 Comm: syz.4.3273 Not tainted 6.1.135-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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 4e 5b 4a f7 48 89 df e8 a6 20 4b f7 e8 b1 22 6e f7 fb bf 01 00 00 00 <e8> b6 9d 3e f7 65 8b 05 b7 72 e9 75 85 c0 74 02 5b c3 e8 04 84 e7
RSP: 0018:ffffc9000c76fbb8 EFLAGS: 00000286
RAX: 734e131ee3e48200 RBX: ffff88805760ca00 RCX: 734e131ee3e48200
RDX: dffffc0000000000 RSI: ffffffff8a6bff00 RDI: 0000000000000001
RBP: ffff88805760ce98 R08: dffffc0000000000 R09: ffffed100aec1941
R10: ffffed100aec1941 R11: 1ffff1100aec1940 R12: 1ffff1100aec19d3
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f7b9f2986c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e40aff8 CR3: 00000000579b9000 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: 0033:0x7f7b9e38e967
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:00007f7b9f2980e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f7b9e5b5fa8 RCX: 00007f7b9e38e969
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7b9e5b5fa8
RBP: 00007f7b9e5b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7b9e5b5fac
R13: 0000000000000000 R14: 00007ffd0b3e72e0 R15: 00007ffd0b3e73c8
 </TASK>