rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P15209/1:b..l.. P15205/1:b..l.. P15200/1:b..l.. P15056/1:b..l..
rcu: 	(detected by 0, t=10502 jiffies, g=252297, q=834105 ncpus=1)
task:kworker/u8:7    state:R  running task     stack:25704 pid:15056 tgid:15056 ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue:  0x0 (bond1)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5830 kernel/sched/core.c:7382
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7662
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
 irqentry_exit+0x14f/0x9b0 kernel/entry/common.c:154
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_release+0x2e1/0x3c0 kernel/locking/lockdep.c:5968
Code: e2 3c 13 00 00 00 00 eb b5 e8 0b 51 5f 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 13 9b 3c 13 48 3b 44 24 28 75 48 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 28 c9 1c
RSP: 0018:ffffc900053f7308 EFLAGS: 00000282
RAX: f9ebbf776a2b5a00 RBX: 0000000000000206 RCX: 0000000000000046
RDX: ffffc900053f7401 RSI: ffffffff8e932d08 RDI: ffffffff8c8ea080
RBP: ffff888035cb0bd8 R08: ffffc900053f7848 R09: 0000000000000000
R10: ffffc900053f7438 R11: fffff52000a7ee89 R12: 0000000000000001
R13: 0000000000000001 R14: ffffffff9015a4a0 R15: ffff888035cb0000
 rcu_lock_release include/linux/rcupdate.h:319 [inline]
 rcu_read_unlock include/linux/rcupdate.h:880 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1216 [inline]
 unwind_next_frame+0x1baa/0x2550 arch/x86/kernel/unwind_orc.c:709
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 save_stack+0x122/0x230 mm/page_owner.c:183
 __reset_page_owner+0x73/0x2a0 mm/page_owner.c:338
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1403 [inline]
 __free_frozen_pages+0xc97/0xd90 mm/page_alloc.c:2954
 __slab_free+0x269/0x2c0 mm/slub.c:5926
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_kmalloc+0x22/0xb0 mm/kasan/common.c:417
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5531 [inline]
 __kmalloc_node_track_caller_noprof+0x4af/0x720 mm/slub.c:5662
 kvasprintf+0xeb/0x1a0 lib/kasprintf.c:25
 __kthread_create_on_node+0x1b3/0x3d0 kernel/kthread.c:491
 kthread_create_on_node+0xeb/0x140 kernel/kthread.c:559
 create_worker+0x2e3/0x7c0 kernel/workqueue.c:3008
 maybe_create_worker kernel/workqueue.c:3276 [inline]
 manage_workers kernel/workqueue.c:3362 [inline]
 worker_thread+0x4c9/0xfb0 kernel/workqueue.c:3634
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
task:syz.0.2962      state:R  running task     stack:26856 pid:15200 tgid:15198 ppid:5634   task_flags:0x40044c flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5830 kernel/sched/core.c:7382
 preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7561
 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:201 [inline]
 _raw_spin_unlock+0x41/0x50 kernel/locking/spinlock.c:213
 spin_unlock include/linux/spinlock.h:401 [inline]
 zap_pte_range mm/memory.c:2058 [inline]
 zap_pmd_range mm/memory.c:2113 [inline]
 zap_pud_range mm/memory.c:2141 [inline]
 zap_p4d_range mm/memory.c:2162 [inline]
 __zap_vma_range+0x3d29/0x4b50 mm/memory.c:2202
 unmap_vmas+0x38b/0x550 mm/memory.c:2271
 exit_mmap+0x290/0xa40 mm/mmap.c:1315
 __mmput+0x118/0x420 kernel/fork.c:1192
 exit_mm+0x18e/0x240 kernel/exit.c:586
 do_exit+0x6a8/0x2360 kernel/exit.c:967
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1123
 get_signal+0x1216/0x12c0 kernel/signal.c:3112
 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd04db9f1eb
RSP: 002b:00007fd04e9e6f00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 00007fd04db9f1eb
RDX: 00007fd04e9e7fd0 RSI: 0000000080085502 RDI: 0000000000000003
RBP: 00007fd04e9e7fd0 R08: 0000000000000001 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000080085502
R13: 0000000800000000 R14: 0000000000000002 R15: 00007fd04dc55a91
 </TASK>
task:syz.3.2968      state:R  running task     stack:26856 pid:15205 tgid:15204 ppid:5637   task_flags:0x40044c flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5830 kernel/sched/core.c:7382
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7662
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
 irqentry_exit+0x14f/0x9b0 kernel/entry/common.c:154
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 a0 83 5f 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 a2 cd 3c 13 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 bf 96 62 0a cc 48 8d 3d 47 f8 1c
RSP: 0018:ffffc90003c8f160 EFLAGS: 00000296
RAX: 675790d72d803800 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000ec6000bf RSI: ffffffff8e932d08 RDI: ffffffff8c8ea080
RBP: ffff88802f150000 R08: ffffffff8178798f R09: 0000000000000000
R10: ffffc90003c8f298 R11: ffffffff81b3ad40 R12: ffffffff9015a4a0
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 rcu_read_lock include/linux/rcupdate.h:849 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:264 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2780 [inline]
 slab_free mm/slub.c:6630 [inline]
 kmem_cache_free+0x182/0x650 mm/slub.c:6757
 anon_vma_chain_free mm/rmap.c:147 [inline]
 unlink_anon_vmas+0x655/0x720 mm/rmap.c:541
 free_pgtables+0x836/0xb70 mm/memory.c:414
 exit_mmap+0x4aa/0xa40 mm/mmap.c:1327
 __mmput+0x118/0x420 kernel/fork.c:1192
 exit_mm+0x18e/0x240 kernel/exit.c:586
 do_exit+0x6a8/0x2360 kernel/exit.c:967
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1123
 get_signal+0x1216/0x12c0 kernel/signal.c:3112
 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4beb79f559
RSP: 002b:00007f4bec5f90e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f4beba25fa8 RCX: 00007f4beb79f559
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f4beba25fa8
RBP: 00007f4beba25fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4beba26038 R14: 00007ffcb7e4f680 R15: 00007ffcb7e4f768
 </TASK>
task:syz.4.2970      state:R  running task     stack:26696 pid:15209 tgid:15207 ppid:13296  task_flags:0x40044c flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5830 kernel/sched/core.c:7382
 preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7561
 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:201 [inline]
 _raw_spin_unlock+0x41/0x50 kernel/locking/spinlock.c:213
 spin_unlock include/linux/spinlock.h:401 [inline]
 zap_pte_range mm/memory.c:2058 [inline]
 zap_pmd_range mm/memory.c:2113 [inline]
 zap_pud_range mm/memory.c:2141 [inline]
 zap_p4d_range mm/memory.c:2162 [inline]
 __zap_vma_range+0x3d29/0x4b50 mm/memory.c:2202
 unmap_vmas+0x38b/0x550 mm/memory.c:2271
 exit_mmap+0x290/0xa40 mm/mmap.c:1315
 __mmput+0x118/0x420 kernel/fork.c:1192
 exit_mm+0x18e/0x240 kernel/exit.c:586
 do_exit+0x6a8/0x2360 kernel/exit.c:967
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1123
 get_signal+0x1216/0x12c0 kernel/signal.c:3112
 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fadee19f559
RSP: 002b:00007fadeefef028 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: fffffffffffffe00 RBX: 00007fadee425fa0 RCX: 00007fadee19f559
RDX: 0000000000000010 RSI: 0000200000000000 RDI: 0000000000000008
RBP: 00007fadee236b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fadee426038 R14: 00007fadee425fa0 R15: 00007ffc11857bf8
 </TASK>
rcu: rcu_preempt kthread starved for 531 jiffies! g252297 f0x2 RCU_GP_WAIT_FQS(5) ->state=R ->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:26848 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5830 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x1230 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 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: 3231 Comm: kworker/R-bat_e Tainted: G             L       syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: bat_events batadv_dat_purge
RIP: 0010:deref_stack_reg+0x1a2/0x220 arch/x86/kernel/unwind_orc.c:422
Code: 39 f0 0f 96 c0 20 c8 3c 01 75 30 4c 89 c7 49 89 f7 e8 12 07 00 00 49 89 c6 48 8b 5c 24 08 48 89 d8 48 c1 e8 03 42 80 3c 38 00 <74> 08 48 89 df e8 e4 49 c7 00 4c 89 33 b0 01 eb 02 31 c0 48 83 c4
RSP: 0018:ffffc90000006d98 EFLAGS: 00000246
RAX: 1ffff92000000dd9 RBX: ffffc90000006ec8 RCX: 0000000000000001
RDX: ffffc90000006ec8 RSI: dffffc0000000000 RDI: ffffc90000007f50
RBP: ffffc90000000000 R08: ffffc90000007f50 R09: 0000000000000000
R10: ffffc90000006ed8 R11: fffff52000000ddd R12: 1ffff92000000dd2
R13: 1ffff92000000dd3 R14: 8000000000000101 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888123411000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557ee314e8 CR3: 000000000ff48000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 unwind_next_frame+0x19bd/0x2550 arch/x86/kernel/unwind_orc.c:-1
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:351 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:377
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4720 [inline]
 slab_alloc_node mm/slub.c:5033 [inline]
 kmem_cache_alloc_node_noprof+0x34f/0x600 mm/slub.c:5105
 kmalloc_reserve net/core/skbuff.c:616 [inline]
 __alloc_skb+0x27a/0x7a0 net/core/skbuff.c:716
 alloc_skb include/linux/skbuff.h:1390 [inline]
 synproxy_send_client_synack+0x175/0xde0 net/netfilter/nf_synproxy_core.c:463
 nft_synproxy_eval_v4+0x362/0x4e0 net/netfilter/nft_synproxy.c:59
 nft_synproxy_do_eval+0x389/0x5d0 net/netfilter/nft_synproxy.c:142
 expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
 nft_do_chain+0x48d/0x1b10 net/netfilter/nf_tables_core.c:285
 nft_do_chain_inet+0x360/0x4b0 net/netfilter/nft_chain_filter.c:162
 nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
 nf_hook_slow+0xc5/0x220 net/netfilter/core.c:633
 nf_hook include/linux/netfilter.h:280 [inline]
 NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:323
 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:325
 __netif_receive_skb_one_core net/core/dev.c:6405 [inline]
 __netif_receive_skb net/core/dev.c:6518 [inline]
 process_backlog+0xa6b/0x18b0 net/core/dev.c:6869
 __napi_poll+0xaa/0x330 net/core/dev.c:7938
 napi_poll net/core/dev.c:8001 [inline]
 net_rx_action+0x61d/0xf50 net/core/dev.c:8158
 handle_softirqs+0x265/0x8d0 kernel/softirq.c:669
 do_softirq+0x77/0xd0 kernel/softirq.c:569
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
 spin_unlock_bh include/linux/spinlock.h:407 [inline]
 __batadv_dat_purge net/batman-adv/distributed-arp-table.c:252 [inline]
 batadv_dat_purge+0x2d7/0x3c0 net/batman-adv/distributed-arp-table.c:271
 process_one_work kernel/workqueue.c:3495 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
 rescuer_thread+0x84a/0x12a0 kernel/workqueue.c:3803
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>