rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=6e6c/1/0x4000000000000000 softirq=194465/194466 fqs=5
rcu: 	(t=10502 jiffies g=231917 q=252 ncpus=2)
rcu: rcu_preempt kthread starved for 10492 jiffies! g231917 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27496 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7326
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5620 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: cb 7e 02 e9 9e 8f 3f f5 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d b3 be 18 00 fb f4 <e9> 77 8f 3f f5 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc900034475c8 EFLAGS: 000002d3
RAX: ffffffff8176b19a RBX: 0000000000000003 RCX: ffff88807f45dd00
RDX: 0000000000000000 RSI: ffffffff8e228edb RDI: ffffffff8c4bbf80
RBP: 0000000000000003 R08: ffffffff90574837 R09: 1ffffffff20ae906
R10: dffffc0000000000 R11: fffffbfff20ae907 R12: 0000000000000200
R13: 0000000000000000 R14: ffffffff8e80a140 R15: dffffc0000000000
FS:  0000555576783500(0000) GS:ffff888125055000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555767834e8 CR3: 000000005917c000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline]
 kvm_wait+0x10f/0x150 arch/x86/kernel/kvm.c:1096
 pv_wait arch/x86/include/asm/paravirt-spinlock.h:83 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:466 [inline]
 __pv_queued_spin_lock_slowpath+0x74a/0xbc0 kernel/locking/qspinlock.c:325
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:35 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:66 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x26c/0x2f0 kernel/locking/spinlock_debug.c:116
 spin_lock include/linux/spinlock.h:342 [inline]
 free_pid+0x10a/0x340 kernel/pid.c:120
 free_pids+0x80/0x100 kernel/pid.c:156
 release_task+0x11e7/0x16c0 kernel/exit.c:300
 wait_task_zombie kernel/exit.c:1314 [inline]
 wait_consider_task+0x197d/0x2df0 kernel/exit.c:1541
 do_wait_thread kernel/exit.c:1604 [inline]
 __do_wait+0x148/0x720 kernel/exit.c:1722
 do_wait+0x1e7/0x510 kernel/exit.c:1756
 kernel_wait4+0x232/0x2b0 kernel/exit.c:1915
 __do_sys_wait4 kernel/exit.c:1943 [inline]
 __se_sys_wait4 kernel/exit.c:1939 [inline]
 __x64_sys_wait4+0x166/0x240 kernel/exit.c:1939
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb6a5d5e90e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007ffea260d748 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 0000555576783500 RCX: 00007fb6a5d5e90e
RDX: 0000000040000001 RSI: 00007ffea260d7ec RDI: ffffffffffffffff
RBP: 00007ffea260d7ec R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000007f6
R13: 0000000000000014 R14: 000000000011f4fc R15: 00007ffea260d840
 </TASK>
CPU: 0 UID: 0 PID: 5616 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198
Code: f7 e8 2d ed cf f5 f7 c3 00 02 00 00 74 05 e8 90 cd fb f5 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> c4 00 c1 f5 65 8b 05 bd 40 99 07 85 c0 74 18 5b 41 5e e9 8c d1
RSP: 0018:ffffc90000007e08 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000000000102
RDX: 0000000000000002 RSI: ffffffff8e228edb RDI: 0000000000000001
RBP: ffff8880506c1538 R08: ffffffff90574837 R09: 1ffffffff20ae906
R10: dffffc0000000000 R11: fffffbfff20ae907 R12: ffff8880b86281c0
R13: ffffffff89cdedf0 R14: ffff8880b86281c0 R15: 1ffff110170c50c2
FS:  000055558047c500(0000) GS:ffff888124f55000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3a253c6b52 CR3: 0000000059173000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:2028 [inline]
 __hrtimer_run_queues+0x2bf/0xa10 kernel/time/hrtimer.c:2096
 hrtimer_run_softirq+0x17a/0x240 kernel/time/hrtimer.c:2113
 handle_softirqs+0x225/0x840 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:radix_tree_descend lib/radix-tree.c:88 [inline]
RIP: 0010:__radix_tree_lookup lib/radix-tree.c:766 [inline]
RIP: 0010:radix_tree_delete_item+0xe3/0x400 lib/radix-tree.c:1420
Code: ff ce 4c 8b 3c 24 4c 89 ff 4c 89 f6 e8 e6 46 fb f5 4d 39 f7 0f 87 73 02 00 00 4c 89 e5 48 83 e5 fc 49 c1 ec 03 41 0f b6 04 1c <84> c0 0f 85 b3 00 00 00 44 0f b6 65 00 bf 40 00 00 00 44 89 e6 e8
RSP: 0018:ffffc90003367790 EFLAGS: 00000212
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff888033389f00
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000002
RBP: ffff888082e54580 R08: ffff888033389f00 R09: 0000000000000003
R10: 0000000080000001 R11: 0000000000000000 R12: 1ffff110105ca8b0
R13: 0000000000000021 R14: 0000000000000002 R15: 0000000000000006
 free_pid+0x22f/0x340 kernel/pid.c:139
 free_pids+0x80/0x100 kernel/pid.c:156
 release_task+0x11e7/0x16c0 kernel/exit.c:300
 wait_task_zombie kernel/exit.c:1314 [inline]
 wait_consider_task+0x197d/0x2df0 kernel/exit.c:1541
 do_wait_thread kernel/exit.c:1604 [inline]
 __do_wait+0x148/0x720 kernel/exit.c:1722
 do_wait+0x1e7/0x510 kernel/exit.c:1756
 kernel_wait4+0x232/0x2b0 kernel/exit.c:1915
 __do_sys_wait4 kernel/exit.c:1943 [inline]
 __se_sys_wait4 kernel/exit.c:1939 [inline]
 __x64_sys_wait4+0x166/0x240 kernel/exit.c:1939
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faf5e15e90e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007fffa1593dc8 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 000055558047c500 RCX: 00007faf5e15e90e
RDX: 0000000040000001 RSI: 00007fffa1593e6c RDI: ffffffffffffffff
RBP: 00007fffa1593e6c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000082c
R13: 0000000000000064 R14: 000000000011f947 R15: 00007fffa1593ec0
 </TASK>