rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6030 P5877/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=11985, q=880 ncpus=2)
task:udevd           state:R  running task     stack:22400 pid:5877  tgid:5877  ppid:5193   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5282 [inline]
 __schedule+0x14ed/0x5040 kernel/sched/core.c:6894
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7221
 irqentry_exit+0x5e3/0x670 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
RIP: 0010:rcu_read_lock include/linux/rcupdate.h:850 [inline]
RIP: 0010:class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
RIP: 0010:unwind_next_frame+0xb0/0x23d0 arch/x86/kernel/unwind_orc.c:495
Code: 4f 02 00 00 89 84 24 8c 00 00 00 4c 89 bc 24 90 00 00 00 e8 f2 75 33 00 4c 8d 3d 00 00 00 00 48 c7 c7 a0 ef 13 8e 31 f6 31 d2 <b9> 02 00 00 00 45 31 c0 45 31 c9 41 57 e8 fe f5 29 00 48 83 c4 08
RSP: 0018:ffffc9000417f3f8 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffffff81742658 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e13efa0
RBP: dffffc0000000000 R08: ffffc9000417f501 R09: 0000000000000000
R10: ffffc9000417f528 R11: fffff5200082feb1 R12: 1ffff9200082fea5
R13: ffffc9000417f560 R14: ffffc9000417f528 R15: ffffffff8173fd75
 __unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:773
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 save_stack+0xf5/0x1f0 mm/page_owner.c:165
 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:341
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x23d/0x2a0 mm/page_alloc.c:1887
 prep_new_page mm/page_alloc.c:1895 [inline]
 get_page_from_freelist+0x23a5/0x2440 mm/page_alloc.c:3948
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5257
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3091 [inline]
 allocate_slab+0x86/0x3b0 mm/slub.c:3264
 new_slab mm/slub.c:3318 [inline]
 ___slab_alloc+0xdb6/0x17b0 mm/slub.c:4672
 __slab_alloc+0x65/0x100 mm/slub.c:4795
 __slab_alloc_node mm/slub.c:4871 [inline]
 slab_alloc_node mm/slub.c:5271 [inline]
 kmem_cache_alloc_noprof+0x40f/0x710 mm/slub.c:5290
 getname_flags+0xb8/0x540 fs/namei.c:146
 getname include/linux/fs.h:2505 [inline]
 do_sys_openat2+0xbc/0x200 fs/open.c:1387
 do_sys_open fs/open.c:1397 [inline]
 __do_sys_openat fs/open.c:1413 [inline]
 __se_sys_openat fs/open.c:1408 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1408
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0457ca7407
RSP: 002b:00007ffd26feb510 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f045844f880 RCX: 00007f0457ca7407
RDX: 0000000000080000 RSI: 00007ffd26feb690 RDI: ffffffffffffff9c
RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000560dce1f77f5
R13: 0000560dce1f77f5 R14: 0000000000000001 R15: 00007ffd26feff20
 </TASK>
task:syz.0.19        state:R  running task     stack:24376 pid:6030  tgid:6029  ppid:5832   task_flags:0x400140 flags:0x00080000
Call Trace:
 <IRQ>
 sched_show_task+0x49d/0x630 kernel/sched/core.c:7850
 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:292 [inline]
 print_other_cpu_stall+0xf7a/0x1340 kernel/rcu/tree_stall.h:681
 check_cpu_stall kernel/rcu/tree_stall.h:856 [inline]
 rcu_pending kernel/rcu/tree.c:3679 [inline]
 rcu_sched_clock_irq+0x940/0x1060 kernel/rcu/tree.c:2716
 update_process_times+0x23c/0x2f0 kernel/time/timer.c:2474
 tick_sched_handle kernel/time/tick-sched.c:298 [inline]
 tick_nohz_handler+0x3e9/0x710 kernel/time/tick-sched.c:319
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x4d0/0xc30 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 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:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0x2e/0xb0 kernel/rcu/tree.c:752
Code: 41 57 41 56 53 65 ff 05 a0 cc fa 10 e8 db e8 b6 09 89 c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd d0 dd bb 8d <4c> 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 cc c7 80 00
RSP: 0018:ffffc90005367608 EFLAGS: 00000297
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000080000202
RDX: 0000000000000000 RSI: ffffffff8be08c40 RDI: ffffffff8be08c00
RBP: ffffffff894f81b1 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff940002d962f R12: 0000000000000000
R13: ffff88807b20b5a0 R14: ffffffff8dbbddd8 R15: dffffc0000000000
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x5f/0x340 kernel/locking/lockdep.c:5831
 __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:344 [inline]
 page_pool_producer_lock net/core/page_pool.c:167 [inline]
 page_pool_recycle_in_ring net/core/page_pool.c:799 [inline]
 page_pool_put_unrefed_netmem+0x2e1/0xb40 net/core/page_pool.c:921
 xdp_test_run_batch net/bpf/test_run.c:341 [inline]
 bpf_test_run_xdp_live+0xc4e/0x1b20 net/bpf/test_run.c:379
 bpf_prog_test_run_xdp+0x7de/0x1100 net/bpf/test_run.c:1396
 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4702
 __sys_bpf+0x5ee/0x8a0 kernel/bpf/syscall.c:6224
 __do_sys_bpf kernel/bpf/syscall.c:6319 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6317 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6317
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1afb98f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1af9bf6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f1afbbe5fa0 RCX: 00007f1afb98f749
RDX: 0000000000000050 RSI: 0000200000000240 RDI: 000000000000000a
RBP: 00007f1afba13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1afbbe6038 R14: 00007f1afbbe5fa0 R15: 00007fff139b0e68
 </TASK>
rcu: rcu_preempt kthread starved for 10464 jiffies! g11985 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:28080 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5282 [inline]
 __schedule+0x14ed/0x5040 kernel/sched/core.c:6894
 __schedule_loop kernel/sched/core.c:6976 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6991
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x11b0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9b/0x2d0 kernel/rcu/tree.c:2297
 kthread+0x389/0x480 kernel/kthread.c:467
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </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: cc cc cc cc 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 43 be 2a 00 f3 0f 1e fa fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff8de07dc0 EFLAGS: 000002c2
RAX: 000000000018cb2f RBX: ffffffff8197161e RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8d9a0b7f RDI: ffffffff8be08c60
RBP: ffffffff8de07eb0 R08: ffff8880b863375b R09: 1ffff110170c66eb
R10: dffffc0000000000 R11: ffffed10170c66ec R12: ffffffff8fa25d70
R13: 1ffffffff1bd29b8 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125c07000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb4c01b3492 CR3: 0000000055848000 CR4: 00000000003526f0
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:191 [inline]
 do_idle+0x1be/0x4d0 kernel/sched/idle.c:332
 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:430
 rest_init+0x2de/0x300 init/main.c:757
 start_kernel+0x386/0x3d0 init/main.c:1207
 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>