rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5526/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=9953, q=749703 ncpus=2)
task:syz.4.60        state:R  running task     stack:26144 pid:5526  tgid:5517  ppid:5235   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5315 [inline]
 __schedule+0x1843/0x4ae0 kernel/sched/core.c:6674
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6996
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 89 fb e8 23 00 00 00 48 8b 3d f4 f8 9a 0c 48 89 de 5b e9 f3 4d 5a 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 80 d7 03 00 65 8b 15 10 1e
RSP: 0018:ffffc9000945f850 EFLAGS: 00000202
RAX: 0000000000000002 RBX: dffffc0000000000 RCX: ffff8880274bbc00
RDX: ffffc9000a6ba000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8207c185 R09: 1ffff110038ae03f
R10: dffffc0000000000 R11: ffffed10038ae040 R12: ffff88801c570200
R13: 1ffffffff347d5a4 R14: 0000000000000003 R15: 0000000000000008
 __page_table_check_zero+0x206/0x350 mm/page_table_check.c:160
 page_table_check_free include/linux/page_table_check.h:41 [inline]
 free_pages_prepare mm/page_alloc.c:1109 [inline]
 free_unref_page+0xce4/0xf00 mm/page_alloc.c:2638
 discard_slab mm/slub.c:2678 [inline]
 __put_partials+0xeb/0x130 mm/slub.c:3146
 put_cpu_partial+0x17c/0x250 mm/slub.c:3221
 __slab_free+0x2ea/0x3d0 mm/slub.c:4450
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_kmalloc+0x23/0xb0 mm/kasan/common.c:385
 kasan_kmalloc include/linux/kasan.h:257 [inline]
 __kmalloc_cache_noprof+0x19c/0x2c0 mm/slub.c:4296
 kmalloc_noprof include/linux/slab.h:878 [inline]
 kzalloc_noprof include/linux/slab.h:1014 [inline]
 ref_tracker_alloc+0x14b/0x490 lib/ref_tracker.c:203
 __netns_tracker_alloc include/net/net_namespace.h:331 [inline]
 netns_tracker_alloc include/net/net_namespace.h:340 [inline]
 get_net_track include/net/net_namespace.h:357 [inline]
 sk_alloc+0x1c8/0x370 net/core/sock.c:2229
 unix_create1+0xb4/0x7a0
 unix_create+0x14e/0x200 net/unix/af_unix.c:1094
 __sock_create+0x490/0x920 net/socket.c:1577
 sock_create net/socket.c:1628 [inline]
 __sys_socketpair+0x2ca/0x720 net/socket.c:1775
 __do_sys_socketpair net/socket.c:1828 [inline]
 __se_sys_socketpair net/socket.c:1825 [inline]
 __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1825
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6ad8b7def9
RSP: 002b:00007f6ad98bd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f6ad8d36058 RCX: 00007f6ad8b7def9
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: 00007f6ad8bf0b76 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6ad8d36058 R15: 00007ffe31863928
 </TASK>
rcu: rcu_preempt kthread starved for 10462 jiffies! g9953 f0x2 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:25912 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5315 [inline]
 __schedule+0x1843/0x4ae0 kernel/sched/core.c:6674
 __schedule_loop kernel/sched/core.c:6751 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6766
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </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: 9 Comm: kworker/0:1 Not tainted 6.11.0-syzkaller-08481-g88264981f208 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: events nsim_dev_trap_report_work
RIP: 0010:synproxy_send_client_synack+0x538/0xf30 net/netfilter/nf_synproxy_core.c:472
Code: 10 84 c0 49 89 d7 0f 85 07 07 00 00 66 41 89 5d 02 48 8b 7c 24 10 4c 89 e6 48 8d 94 24 a0 00 00 00 e8 9c 21 62 00 89 c3 0f cb <4d> 8d 75 04 4c 89 f0 48 c1 e8 03 42 0f b6 04 38 84 c0 4c 89 fa 0f
RSP: 0018:ffffc90000007060 EFLAGS: 00000202
RAX: 000000004bf284fe RBX: 00000000fe84f24b RCX: 00000000009933b7
RDX: 1ffff92000000df4 RSI: 217d549a24dc0dda RDI: 1000000000000000
RBP: ffffc90000007170 R08: ffffffff8a3dc3c8 R09: 1ffff11041b89a5c
R10: dffffc0000000000 R11: ffffed1041b89a5d R12: ffff88820dc4c954
R13: ffff88820dc4d154 R14: dffffc0000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31f11ff8 CR3: 000000000e734000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 nft_synproxy_eval_v4+0x3ca/0x610 net/netfilter/nft_synproxy.c:59
 nft_synproxy_do_eval+0x362/0xa60 net/netfilter/nft_synproxy.c:141
 expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]
 nft_do_chain+0x4ad/0x1da0 net/netfilter/nf_tables_core.c:288
 nft_do_chain_inet+0x418/0x6b0 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:269 [inline]
 NF_HOOK+0x29e/0x450 include/linux/netfilter.h:312
 NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314
 __netif_receive_skb_one_core net/core/dev.c:5662 [inline]
 __netif_receive_skb+0x2bf/0x650 net/core/dev.c:5775
 process_backlog+0x662/0x15b0 net/core/dev.c:6107
 __napi_poll+0xcb/0x490 net/core/dev.c:6771
 napi_poll net/core/dev.c:6840 [inline]
 net_rx_action+0x89b/0x1240 net/core/dev.c:6962
 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
 do_softirq+0x11b/0x1e0 kernel/softirq.c:455
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline]
 nsim_dev_trap_report_work+0x75d/0xaa0 drivers/net/netdevsim/dev.c:850
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>