rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7271/1:b..l
rcu: 	(detected by 0, t=10507 jiffies, g=10989, q=95 ncpus=2)
task:syz-executor    state:R  running task     stack:27096 pid:7271  tgid:7271  ppid:7269   task_flags:0x400140 flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6947
 preempt_schedule+0xae/0xc0 kernel/sched/core.c:6971
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 wp_page_copy mm/memory.c:3579 [inline]
 do_wp_page+0x1cb9/0x5760 mm/memory.c:3939
 handle_pte_fault mm/memory.c:6013 [inline]
 __handle_mm_fault+0x1028/0x5380 mm/memory.c:6140
 handle_mm_fault+0x3f6/0x8c0 mm/memory.c:6309
 do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1337
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f880e539cc7
RSP: 002b:00007ffd4530fbf0 EFLAGS: 00010206
RAX: 00007ffd453102f0 RBX: 00007ffd45310150 RCX: 0000000000000000
RDX: 00007ffd453102d8 RSI: 00007f880e62abe3 RDI: 00007ffd45310150
RBP: 00007ffd45310240 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000044000 R11: 0000000000000246 R12: 00007f880e62abe3
R13: 00007ffd453102d8 R14: 0000000000000000 R15: 00007ffd45310150
 </TASK>
rcu: rcu_preempt kthread starved for 10507 jiffies! g10989 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:27304 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6860
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2248
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted 6.15.0-rc3-syzkaller-00580-g4acf6d4f6afc #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: netns cleanup_net
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 3b 70 6e f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 53 f3 37 f6 65 8b 05 5c f5 1c 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90000117240 EFLAGS: 00000206
RAX: b93369b989aa5e00 RBX: 0000000000000a06 RCX: b93369b989aa5e00
RDX: 0000000000000002 RSI: ffffffff8d74d674 RDI: 0000000000000001
RBP: ffffc900001172d8 R08: ffffffff8f7f1877 R09: 1ffffffff1efe30e
R10: dffffc0000000000 R11: fffffbfff1efe30f R12: dffffc0000000000
R13: ffff8880b8927840 R14: ffff8880b89276c0 R15: 1ffff92000022e48
FS:  0000000000000000(0000) GS:ffff8881260c4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc719d3cd8 CR3: 000000007d028000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 unlock_hrtimer_base kernel/time/hrtimer.c:1020 [inline]
 hrtimer_try_to_cancel+0x3be/0x420 kernel/time/hrtimer.c:1367
 hrtimer_cancel+0x3b/0x50 kernel/time/hrtimer.c:1488
 taprio_reset+0x6d/0x190 net/sched/sch_taprio.c:2001
 qdisc_reset+0x10c/0x580 net/sched/sch_generic.c:1036
 dev_reset_queue+0x102/0x1b0 net/sched/sch_generic.c:1312
 netdev_for_each_tx_queue include/linux/netdevice.h:2649 [inline]
 dev_deactivate_many+0x720/0xd40 net/sched/sch_generic.c:1376
 __dev_close_many+0x162/0x6f0 net/core/dev.c:1738
 dev_close_many+0x225/0x410 net/core/dev.c:1779
 unregister_netdevice_many_notify+0x834/0x2320 net/core/dev.c:12006
 unregister_netdevice_many net/core/dev.c:12099 [inline]
 default_device_exit_batch+0x819/0x890 net/core/dev.c:12601
 ops_exit_list net/core/net_namespace.c:206 [inline]
 ops_undo_list+0x522/0x990 net/core/net_namespace.c:253
 cleanup_net+0x4c5/0x8a0 net/core/net_namespace.c:686
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>