rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6321/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=19305, q=1008 ncpus=2)
task:syz-executor    state:R  running task     stack:23416 pid:6321  tgid:6321  ppid:6317   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0xfee/0x6120 kernel/sched/core.c:6911
 preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7095
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
 _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:389 [inline]
 copy_pte_range mm/memory.c:1344 [inline]
 copy_pmd_range mm/memory.c:1405 [inline]
 copy_pud_range mm/memory.c:1442 [inline]
 copy_p4d_range mm/memory.c:1466 [inline]
 copy_page_range+0x1ecd/0x6600 mm/memory.c:1552
 dup_mmap+0xd25/0x2180 mm/mmap.c:1841
 dup_mm kernel/fork.c:1531 [inline]
 copy_mm kernel/fork.c:1583 [inline]
 copy_process+0x7523/0x7a40 kernel/fork.c:2223
 kernel_clone+0xfc/0x9a0 kernel/fork.c:2653
 __do_sys_clone+0xd9/0x120 kernel/fork.c:2794
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f24d01c3992
RSP: 002b:00007ffc18cd0860 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffc18cd0860 RCX: 00007f24d01c3992
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffc18cd09ec R08: 0000000000000000 R09: 0000000000000001
R10: 000055555f3a67d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 00000000000252c3 R15: 00007ffc18cd0a40
 </TASK>
rcu: rcu_preempt kthread starved for 10523 jiffies! g19305 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:29256 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0xfee/0x6120 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0xdd/0x390 kernel/sched/core.c:7008
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x754/0xd80 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 03/18/2026
RIP: 0010:__lock_acquire+0x34/0x2630 kernel/locking/lockdep.c:5093
Code: 48 83 ec 70 8b 1d 30 22 f5 0e 65 4c 8b 25 2c 8c 29 12 4c 89 64 24 68 4c 8b a4 24 a8 00 00 00 85 db 0f 84 58 03 00 00 48 8b 07 <49> 89 fa 48 3d 40 47 15 94 0f 84 46 03 00 00 44 8b 1d 76 67 89 0c
RSP: 0018:ffffc90000007cc0 EFLAGS: 00000002
RAX: ffffffff9b1e4e60 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888036a46058
RBP: ffff888036a46058 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124339000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 0000000064b7a000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x1cf/0x380 kernel/locking/lockdep.c:5825
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
 _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
 class_spinlock_irqsave_constructor include/linux/spinlock.h:618 [inline]
 posix_timer_fn+0x2f/0x80 kernel/time/posix-timers.c:371
 __run_hrtimer kernel/time/hrtimer.c:1785 [inline]
 __hrtimer_run_queues+0x50e/0xa70 kernel/time/hrtimer.c:1849
 hrtimer_interrupt+0x397/0x8c0 kernel/time/hrtimer.c:1911
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x109/0x490 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:sched_core_balance+0x9f/0xe20 kernel/sched/core.c:6329
Code: 79 7e 8e e8 e3 fd 0d 00 e8 4e 23 ba 09 41 5a 85 c0 0f 85 28 0a 00 00 4c 89 ef e8 fc 2c ff ff e8 07 f0 39 00 fb 48 63 44 24 50 <48> c7 c3 c0 21 10 94 48 89 dd 48 89 44 24 08 48 83 f8 08 0f 83 4c
RSP: 0018:ffffffff8e407b70 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffff8880b843b1c0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8de7a76f RDI: ffffffff8c1b1e20
RBP: ffffffff8e407c88 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8e4975c0
R13: ffff8880b843b1c0 R14: 0000000000000000 R15: dffffc0000000000
 do_balance_callbacks kernel/sched/core.c:4929 [inline]
 __balance_callbacks kernel/sched/core.c:4985 [inline]
 finish_lock_switch kernel/sched/core.c:5034 [inline]
 finish_task_switch.isra.0+0x446/0xb80 kernel/sched/core.c:5153
 context_switch kernel/sched/core.c:5301 [inline]
 __schedule+0xff6/0x6120 kernel/sched/core.c:6911
 schedule_idle+0x54/0x80 kernel/sched/core.c:7034
 do_idle+0x2dd/0x590 kernel/sched/idle.c:381
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:451
 rest_init+0x251/0x260 init/main.c:760
 start_kernel+0x47f/0x480 init/main.c:1210
 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
 x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
 common_startup_64+0x13e/0x148
 </TASK>