rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P18950/3:b..l P14652/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=115769, q=216 ncpus=2)
task:syz-executor    state:R  running task     stack:21736 pid:14652 tgid:14652 ppid:14622  task_flags:0x400140 flags:0x00080001
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256
 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:trace_lock_acquire include/trace/events/lock.h:24 [inline]
RIP: 0010:lock_acquire+0x58/0x360 kernel/locking/lockdep.c:5831
Code: 8b 05 5c 9e f3 10 48 89 44 24 58 0f 1f 44 00 00 65 8b 05 5f 9e f3 10 83 f8 08 0f 83 b8 01 00 00 89 c0 48 0f a3 05 88 6a 00 0e <73> 16 e8 c1 fb 08 00 84 c0 75 0d f6 05 f5 76 ea 0d 01 0f 84 d7 01
RSP: 0018:ffffc90003487838 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e13d2e0
RBP: ffffffff8173cd25 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff81ac6cb0 R12: 0000000000000002
R13: ffffffff8e13d2e0 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:867 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
 unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 unpoison_slab_object mm/kasan/common.c:342 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4962 [inline]
 slab_alloc_node mm/slub.c:5272 [inline]
 kmem_cache_alloc_lru_noprof+0x35d/0x6d0 mm/slub.c:5291
 sock_alloc_inode+0x28/0xc0 net/socket.c:322
 alloc_inode+0x6a/0x1b0 fs/inode.c:346
 new_inode_pseudo include/linux/fs.h:3395 [inline]
 sock_alloc net/socket.c:637 [inline]
 __sock_create+0x12d/0x9f0 net/socket.c:1569
 sock_create net/socket.c:1663 [inline]
 __sys_socket_create net/socket.c:1700 [inline]
 __sys_socket+0xd7/0x1b0 net/socket.c:1747
 __do_sys_socket net/socket.c:1761 [inline]
 __se_sys_socket net/socket.c:1759 [inline]
 __x64_sys_socket+0x7a/0x90 net/socket.c:1759
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb3ebd90ee7
RSP: 002b:00007ffe88dceb68 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fb3ebd90ee7
RDX: 0000000000000006 RSI: 0000000000000001 RDI: 000000000000000a
RBP: 00007ffe88dcf29c R08: 00007ffe88dceb8c R09: 0079746972756365
R10: 00007ffe88dcebf0 R11: 0000000000000202 R12: 00007fb3ebfb2ca0
R13: 00000000000927c0 R14: 0000000000142760 R15: 00007fb3ebfb4e60
 </TASK>
task:sed             state:R  running task     stack:26088 pid:18950 tgid:18950 ppid:18948  task_flags:0x400000 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7113
 preempt_schedule+0xae/0xc0 kernel/sched/core.c:7137
 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]
 filemap_map_pages+0x1621/0x1c60 mm/filemap.c:3858
 do_fault_around mm/memory.c:5656 [inline]
 do_read_fault mm/memory.c:5689 [inline]
 do_fault mm/memory.c:5832 [inline]
 do_pte_missing mm/memory.c:4361 [inline]
 handle_pte_fault mm/memory.c:6177 [inline]
 __handle_mm_fault+0x347e/0x5400 mm/memory.c:6318
 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6487
 do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7fafd08c2289
RSP: 002b:00007ffc23f32e70 EFLAGS: 00010202
RAX: 00000000000c0040 RBX: 0000000000000004 RCX: 00007fafd08b0918
RDX: 00007fafd08af040 RSI: 00007fafd07ef000 RDI: 00007fafd08b08d8
RBP: 00007ffc23f32fc0 R08: 00007fafd08b0263 R09: 0000000000000003
R10: 0000000000000812 R11: 00007ffc23f330a8 R12: 00007ffc23f32d50
R13: 00007fafd08b10c0 R14: 00007ffc23f33060 R15: 00007fafd08b0918
 </TASK>
rcu: rcu_preempt kthread starved for 10560 jiffies! g115769 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:27224 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7026
 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+0x4bc/0x870 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:
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 10/02/2025
RIP: 0010:hlist_add_head include/linux/list.h:1040 [inline]
RIP: 0010:kmem_alloc_batch lib/debugobjects.c:382 [inline]
RIP: 0010:fill_pool+0xe7/0x570 lib/debugobjects.c:403
Code: 8b 4d ed 09 0f 83 3f 04 00 00 48 c7 44 24 60 00 00 00 00 41 bd 10 00 00 00 48 8b 1d 2b d8 07 09 45 31 e4 eb 11 48 8d 44 24 60 <49> 89 06 41 ff cd 0f 84 cd 00 00 00 48 89 df be 20 21 00 00 e8 c0
RSP: 0018:ffffc90000006e40 EFLAGS: 00000246
RAX: ffffc90000006ea0 RBX: ffff88813ffb08c0 RCX: dffffc0000000000
RDX: ffff88813ffb08c0 RSI: ffffffff8bc073c0 RDI: ffff88805907c868
RBP: ffffc90000006f20 R08: 00000000ffffffff R09: ffff88805907c850
R10: 0000000000000016 R11: ffffffff81ac6cb0 R12: ffff88805907c850
R13: 0000000000000010 R14: ffff88805907c858 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125d0d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb3ebfb12f8 CR3: 0000000052b21000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 debug_objects_fill_pool lib/debugobjects.c:725 [inline]
 debug_object_activate+0x383/0x420 lib/debugobjects.c:814
 debug_rcu_head_queue kernel/rcu/rcu.h:236 [inline]
 kvfree_call_rcu+0xc4/0x4c0 mm/slab_common.c:1986
 cfg80211_update_known_bss+0x830/0x1590 net/wireless/scan.c:1944
 __cfg80211_bss_update+0x147/0x2120 net/wireless/scan.c:1989
 cfg80211_inform_single_bss_data+0xba9/0x1ac0 net/wireless/scan.c:2381
 cfg80211_inform_bss_data+0x203/0x3b40 net/wireless/scan.c:3240
 cfg80211_inform_bss_frame_data+0x3d7/0x730 net/wireless/scan.c:3331
 ieee80211_bss_info_update+0x749/0x9e0 net/mac80211/scan.c:226
 ieee80211_scan_rx+0x593/0xa20 net/mac80211/scan.c:355
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5194 [inline]
 ieee80211_rx_list+0x210c/0x2b90 net/mac80211/rx.c:5447
 ieee80211_rx_napi+0x1a8/0x3d0 net/mac80211/rx.c:5470
 ieee80211_rx include/net/mac80211.h:5214 [inline]
 ieee80211_handle_queued_frames+0xe8/0x1f0 net/mac80211/main.c:453
 tasklet_action_common+0x36c/0x580 kernel/softirq.c:925
 handle_softirqs+0x286/0x870 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: 5e b3 c3 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 33 a1 1b 00 f3 0f 1e fa fb f4 <e9> 33 b3 c3 f5 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff8de07d80 EFLAGS: 000002c6
RAX: bc2db68855efa100 RBX: ffffffff8196bb87 RCX: bc2db68855efa100
RDX: 0000000000000001 RSI: ffffffff8d7e8114 RDI: ffffffff8bc073e0
RBP: ffffffff8de07ea8 R08: ffff8880b8632fdb R09: 1ffff110170c65fb
R10: dffffc0000000000 R11: ffffed10170c65fc R12: ffffffff8f9dfc70
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1bd2a40
 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>