rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P29773/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=129497, q=419 ncpus=2)
task:syz.6.4483      state:R  running task     stack:25128 pid:29773 tgid:29772 ppid:28310  task_flags:0x400140 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:197
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:869 [inline]
RIP: 0010:__task_pid_nr_ns+0x329/0x470 kernel/pid.c:518
Code: 01 00 00 41 8b 2e e8 16 06 ee 09 41 89 c6 31 ff 89 c6 e8 fa 58 33 00 45 85 f6 74 10 e8 10 07 1a 00 84 c0 74 0e e8 a7 54 33 00 <eb> 58 e8 a0 54 33 00 eb 51 e8 e9 05 ee 09 41 89 c6 31 ff 89 c6 e8
RSP: 0018:ffffc90016dc7ea8 EFLAGS: 00000293
RAX: ffffffff818c58e9 RBX: ffff88805c1e1680 RCX: ffff88805826da00
RDX: 0000000000000000 RSI: ffffffff8be33f60 RDI: ffffffff8be33f20
RBP: 0000000000000027 R08: 0000000000000000 R09: ffffffff818c55e8
R10: dffffc0000000000 R11: fffffbfff1f47507 R12: ffff88805c1e1798
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000010
 task_tgid_vnr include/linux/pid.h:298 [inline]
 __ia32_sys_getpid+0x1e/0x30 kernel/sys.c:1001
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc814b85d67
RSP: 002b:00007fc81595aec8 EFLAGS: 00000202 ORIG_RAX: 0000000000000027
RAX: ffffffffffffffda RBX: 00007fc81595b030 RCX: 00007fc814b85d67
RDX: 00007fc81595af00 RSI: 00007fc81595b030 RDI: 0000000000000021
RBP: 0000000000000000 R08: 00007fc80a800000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000202 R12: 0000000000000001
R13: 00007fc814c2db80 R14: 0000000000000000 R15: 00007fc81595b5e0
 </TASK>
rcu: rcu_preempt kthread starved for 409 jiffies! g129497 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:27160 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7058
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148
 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: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: 3e ed 95 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 d9 0d 00 f3 0f 1e fa fb f4 <e9> 13 ed 95 f5 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 000002c2
RAX: 0a63fd35755dc100 RBX: ffffffff819683f8 RCX: 0a63fd35755dc100
RDX: 0000000000000001 RSI: ffffffff8d9ba32d RDI: ffffffff8be33f80
RBP: ffffc90000197f20 R08: ffff8880b8732f9b R09: 1ffff110170e65f3
R10: dffffc0000000000 R11: ffffed10170e65f4 R12: ffffffff8fa3a830
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff1100395bb40
FS:  0000000000000000(0000) GS:ffff888125d12000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f487c6b42e6 CR3: 000000007cecc000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:757
 default_idle_call+0x74/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:190 [inline]
 do_idle+0x1e8/0x510 kernel/sched/idle.c:330
 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:315
 common_startup_64+0x13e/0x147
 </TASK>