rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6805/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=17233, q=477 ncpus=2)
task:syz.0.177       state:R  running task     stack:27896 pid:6805  tgid:6805  ppid:5839   task_flags:0x400040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5253 [inline]
 __schedule+0x17b2/0x4d40 kernel/sched/core.c:6861
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7188
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:debug_lockdep_rcu_enabled+0xd/0x40 kernel/rcu/update.c:320
Code: 8d 67 48 0f b9 3a 90 eb ca cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 31 c0 83 3d 87 da 39 04 00 <74> 1e 83 3d 8a 09 3a 04 00 74 15 65 48 8b 0c 25 08 b0 75 92 31 c0
RSP: 0018:ffffc90003cb7e90 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc90003cb7ee0 RCX: 8e7153b45f59de00
RDX: 000000005a44979c RSI: ffffffff8d9489f3 RDI: ffffffff8bbfa900
RBP: 0000000000000001 R08: ffffffff818c8218 R09: ffffffff8df414c0
R10: dffffc0000000000 R11: fffffbfff1f0026f R12: 0000000000000027
R13: 0000000000000027 R14: 0000000000000000 R15: ffff88802a980000
 rcu_read_lock include/linux/rcupdate.h:868 [inline]
 __task_pid_nr_ns+0x51/0x490 kernel/pid.c:515
 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/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7eff88b865e7
RSP: 002b:00007ffee1ba8b88 EFLAGS: 00000206 ORIG_RAX: 0000000000000027
RAX: ffffffffffffffda RBX: 00007ffee1ba8cf0 RCX: 00007eff88b865e7
RDX: 00007ffee1ba8bc0 RSI: 00007ffee1ba8cf0 RDI: 0000000000000021
RBP: 0000000000000000 R08: 00007eff88de6038 R09: 00007eff88dd2000
R10: 00007eff885ff008 R11: 0000000000000206 R12: 000000000000000f
R13: 00000000000001b6 R14: ffffffff848a2c77 R15: 0000000000077285
 </TASK>
rcu: rcu_preempt kthread starved for 9848 jiffies! g17233 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:25728 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5253 [inline]
 __schedule+0x17b2/0x4d40 kernel/sched/core.c:6861
 __schedule_loop kernel/sched/core.c:6943 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6958
 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+0x52d/0xa60 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: ce 11 ca 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 63 14 22 00 f3 0f 1e fa fb f4 <e9> a3 11 ca f5 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff8dc07d80 EFLAGS: 000002c6
RAX: 230f940d7f5cfd00 RBX: ffffffff819729e7 RCX: 230f940d7f5cfd00
RDX: 0000000000000001 RSI: ffffffff8d762d2a RDI: ffffffff8bbfa900
RBP: ffffffff8dc07ea8 R08: ffff8880b883341b R09: 1ffff11017106683
R10: dffffc0000000000 R11: ffffed1017106684 R12: ffffffff8f801370
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1b92a50
FS:  0000000000000000(0000) GS:ffff8881260c5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb03475c0c1 CR3: 0000000076f3e000 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:767
 default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:190 [inline]
 do_idle+0x1e7/0x510 kernel/sched/idle.c:330
 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428
 rest_init+0x2de/0x300 init/main.c:757
 start_kernel+0x3ae/0x410 init/main.c:1111
 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
 x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
 common_startup_64+0x13e/0x147
 </TASK>