rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P18019/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=92309, q=1588 ncpus=2)
task:syz.1.4014      state:R  running task     stack:28808 pid:18019 tgid:18009 ppid:14648  task_flags:0x400040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:unwind_next_frame+0x46e/0x2550 arch/x86/kernel/unwind_orc.c:520
Code: d1 48 89 15 04 5c fb 11 48 85 d2 0f 84 2e 02 00 00 48 8d 5a 04 48 89 54 24 18 4c 8d 6a 05 48 89 d8 48 c1 e8 03 42 0f b6 04 20 <84> c0 0f 85 b4 19 00 00 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0
RSP: 0018:ffffc9000598f760 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: ffffffff917bb614 RCX: ffffffff90ceb7e0
RDX: ffffffff917bb610 RSI: ffffffff917bb610 RDI: ffffffff8c4bd220
RBP: ffffffff89e37b79 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8eb59c20 R12: dffffc0000000000
R13: ffffffff917bb615 R14: ffffc9000598f808 R15: ffffffff90ceb7e0
 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:165
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_frozen_pages+0xc1e/0xd10 mm/page_alloc.c:2950
 __slab_free+0x274/0x2c0 mm/slub.c:5767
 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:406
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5362 [inline]
 __kmalloc_noprof+0x375/0x720 mm/slub.c:5387
 _kmalloc_noprof include/linux/slab.h:973 [inline]
 sk_prot_alloc+0xe7/0x210 net/core/sock.c:2252
 sk_alloc+0x3a/0x390 net/core/sock.c:2308
 __netlink_create+0x62/0x260 net/netlink/af_netlink.c:627
 netlink_create+0x3ca/0x590 net/netlink/af_netlink.c:685
 __sock_create+0x4b3/0x9d0 net/socket.c:1651
 sock_create net/socket.c:1709 [inline]
 __sys_socket_create net/socket.c:1746 [inline]
 __sys_socket+0xd6/0x1b0 net/socket.c:1793
 __do_sys_socket net/socket.c:1807 [inline]
 __se_sys_socket net/socket.c:1805 [inline]
 __x64_sys_socket+0x7a/0x90 net/socket.c:1805
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f63f9d9f6c7
RSP: 002b:00007f63facbef98 EFLAGS: 00000286 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f63fa026270 RCX: 00007f63f9d9f6c7
RDX: 0000000000000010 RSI: 0000000000000003 RDI: 0000000000000010
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000080 R11: 0000000000000286 R12: 0000000000000000
R13: 00007f63fa026308 R14: 00007f63fa026270 R15: 00007ffc96d4c8a8
 </TASK>
rcu: rcu_preempt kthread starved for 9280 jiffies! g92309 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27752 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7326
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
 kthread+0x388/0x470 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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 4947 Comm: jbd2/sda1-8 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__lock_acquire+0x2f1/0x2cf0 kernel/locking/lockdep.c:5175
Code: 00 49 89 54 c7 18 65 8b 15 f8 16 ca 11 31 f6 85 d2 40 0f 95 c6 31 d2 41 83 be 84 0b 00 00 00 0f 95 c2 c1 e2 0d c1 e6 0e 09 d6 <41> c1 e2 0f 41 0f b7 d2 09 f2 41 83 e5 03 41 c1 e5 10 41 09 d5 8b
RSP: 0018:ffffc90000a07bd8 EFLAGS: 00000006
RAX: 000000000000000f RBX: 0000000000000000 RCX: 0000000000000007
RDX: 0000000000002000 RSI: 0000000000002000 RDI: 0000000000000000
RBP: 0000000000000003 R08: ffffffff8176f21f R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8eb59c20 R12: 0000000000000000
R13: 0000000000000002 R14: ffff888036561f00 R15: ffff888036562aa0
FS:  0000000000000000(0000) GS:ffff888125060000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f63facc0d58 CR3: 00000000774da000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
 rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 rcu_read_lock include/linux/rcupdate.h:840 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1183 [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
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4612 [inline]
 slab_alloc_node mm/slub.c:4945 [inline]
 kmem_cache_alloc_node_noprof+0x355/0x610 mm/slub.c:5017
 kmalloc_reserve net/core/skbuff.c:615 [inline]
 __alloc_skb+0x276/0x7a0 net/core/skbuff.c:715
 alloc_skb include/linux/skbuff.h:1384 [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+0x335/0x550 net/netfilter/nft_synproxy.c:141
 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:619
 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:6206 [inline]
 __netif_receive_skb net/core/dev.c:6319 [inline]
 process_backlog+0xa34/0x1860 net/core/dev.c:6670
 __napi_poll+0xaa/0x330 net/core/dev.c:7729
 napi_poll net/core/dev.c:7792 [inline]
 net_rx_action+0x61d/0xf50 net/core/dev.c:7949
 handle_softirqs+0x225/0x840 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198
Code: f7 e8 cd eb d1 f5 f7 c3 00 02 00 00 74 05 e8 90 d0 fd f5 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> d4 01 c3 f5 65 8b 05 ad 22 9b 07 85 c0 74 18 5b 41 5e e9 91 48
RSP: 0018:ffffc9001065f598 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000080000001
RDX: 0000000000000007 RSI: ffffffff8e229452 RDI: 0000000000000001
RBP: ffffc9001065f640 R08: ffffffff905767f7 R09: 1ffffffff20aecfe
R10: dffffc0000000000 R11: fffffbfff20aecff R12: ffff88801d6d6cc0
R13: 0000000000000000 R14: ffff88801d6d6cc0 R15: 0000000000000000
 spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
 __slab_free+0x222/0x2c0 mm/slub.c:-1
 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_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4612 [inline]
 slab_alloc_node mm/slub.c:4945 [inline]
 kmem_cache_alloc_noprof+0x2a0/0x5f0 mm/slub.c:4959
 alloc_buffer_head+0x2a/0x270 fs/buffer.c:2962
 folio_alloc_buffers+0x19b/0x640 fs/buffer.c:845
 grow_dev_folio fs/buffer.c:985 [inline]
 grow_buffers fs/buffer.c:1026 [inline]
 __getblk_slow fs/buffer.c:1044 [inline]
 bdev_getblk+0x2c3/0x6e0 fs/buffer.c:1439
 __getblk include/linux/buffer_head.h:382 [inline]
 jbd2_journal_get_descriptor_buffer+0x147/0x420 fs/jbd2/journal.c:974
 jbd2_journal_commit_transaction+0x13eb/0x5b70 fs/jbd2/commit.c:636
 kjournald2+0x3bc/0x750 fs/jbd2/journal.c:199
 kthread+0x388/0x470 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>