rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P19760/1:b..l P19761/1:b..l P19664/1:b..l
rcu: 	(detected by 1, t=10738 jiffies, g=111273, q=1683 ncpus=2)
task:udevd           state:R  running task     stack:27056 pid:19664 tgid:19664 ppid:4984   task_flags:0x40014c flags:0x00080800
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5526 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7277
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7599
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:229 [inline]
RIP: 0010:unwind_next_frame+0x205/0x2550 arch/x86/kernel/unwind_orc.c:510
Code: 6c 04 00 00 44 89 f8 4c 8d 2c 85 20 7d c2 91 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 4c 89 e3 0f 85 66 1d 00 00 45 8b 6d 00 <44> 89 f8 ff c0 4c 8d 24 85 20 7d c2 91 4c 89 e0 48 c1 e8 03 0f b6
RSP: 0018:ffffc90004ca7660 EFLAGS: 00000246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 8000000000000000
RDX: 00000000000ae9ca RSI: ffffffff8c6da060 RDI: ffffffff8c6da020
RBP: ffffffff81866417 R08: ffffffff8177f1df R09: 0000000000000000
R10: ffffc90004ca7758 R11: ffffffff81b28ab0 R12: dffffc0000000000
R13: 0000000000019ad0 R14: ffffc90004ca7708 R15: 0000000000008664
 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+0x71/0x1f0 mm/page_owner.c:338
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962
 tlb_batch_list_free mm/mmu_gather.c:161 [inline]
 tlb_finish_mmu+0x13e/0x220 mm/mmu_gather.c:552
 exit_mmap+0x4b2/0x9f0 mm/mmap.c:1328
 __mmput+0x118/0x420 kernel/fork.c:1193
 exit_mm+0x221/0x2d0 kernel/exit.c:617
 do_exit+0x6cd/0x2360 kernel/exit.c:999
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1154
 __do_sys_exit_group kernel/exit.c:1165 [inline]
 __se_sys_exit_group kernel/exit.c:1163 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1163
 x64_sys_call+0x18c6/0x18d0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc30e8f16c5
RSP: 002b:00007ffe8f497ad8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000055d950e9ea40 RCX: 00007fc30e8f16c5
RDX: 00000000000000e7 RSI: fffffffffffffe68 RDI: 0000000000000000
RBP: 000055d950e76910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe8f497b20 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
task:modprobe        state:R  running task     stack:23304 pid:19761 tgid:19761 ppid:43     task_flags:0x400000 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5526 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7277
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7599
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
 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 50 a5 42 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 a2 f0 f1 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 bf a9 45 0a cc 48 8d 3d 97 4e da
RSP: 0018:ffffc9000510f460 EFLAGS: 00000296
RAX: 18309dbb69dbe800 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000006813cef2 RSI: ffffffff8e69cb98 RDI: ffffffff8c6da080
RBP: ffff88802bc05dc0 R08: ffffffff8177f1df R09: 0000000000000000
R10: ffffc9000510f598 R11: ffffffff81b28ab0 R12: ffffffff8ed5c8e0
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
 save_stack+0x122/0x230 mm/page_owner.c:183
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:338
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962
 __slab_free+0x274/0x2c0 mm/slub.c:5823
 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:4683 [inline]
 slab_alloc_node mm/slub.c:4996 [inline]
 kmem_cache_alloc_noprof+0x2b9/0x600 mm/slub.c:5010
 lsm_file_alloc security/security.c:171 [inline]
 security_file_alloc+0x34/0x310 security/security.c:2406
 init_file+0x90/0x2b0 fs/file_table.c:184
 alloc_empty_file+0x74/0x1d0 fs/file_table.c:266
 path_openat+0xa2/0x1d60 fs/namei.c:4986
 do_file_open+0x23e/0x4a0 fs/namei.c:5029
 do_sys_openat2+0x115/0x200 fs/open.c:1417
 do_sys_open fs/open.c:1423 [inline]
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1434
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff978e8b0ba
RSP: 002b:00007ffd2bacf158 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffd2bacf1d0 RCX: 00007ff978e8b0ba
RDX: 0000000000080000 RSI: 00007ffd2bacf1d0 RDI: 00000000ffffff9c
RBP: 00007ffd2bacf1c0 R08: 00007ffd2bacf3c7 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000017
R13: 00007ff978e5f000 R14: 00007ffd2bacf3e0 R15: 0000000000000000
 </TASK>
task:syz.1.3398      state:R  running task     stack:28184 pid:19760 tgid:19757 ppid:17664  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5526 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7277
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7599
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
 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 50 a5 42 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 a2 f0 f1 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 bf a9 45 0a cc 48 8d 3d 97 4e da
RSP: 0018:ffffc900050ff540 EFLAGS: 00000292
RAX: 798396f38adb9e00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000006813cef2 RSI: ffffffff8e69cb98 RDI: ffffffff8c6da080
RBP: ffff88802615ddc0 R08: ffffffff8177f1df R09: 0000000000000000
R10: ffffc900050ff678 R11: ffffffff81b28ab0 R12: ffffffff8ed5c8e0
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
 save_stack+0x122/0x230 mm/page_owner.c:183
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:338
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962
 __slab_free+0x274/0x2c0 mm/slub.c:5823
 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]
 __kmalloc_cache_noprof+0x321/0x600 mm/slub.c:5563
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 call_modprobe kernel/module/kmod.c:84 [inline]
 __request_module+0x2d0/0x630 kernel/module/kmod.c:173
 dev_ioctl+0x680/0x1150 net/core/dev_ioctl.c:734
 sock_do_ioctl+0x23e/0x320 net/socket.c:1339
 sock_ioctl+0x57a/0x7e0 net/socket.c:1446
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3566f9e159
RSP: 002b:00007f3567edf028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3567226180 RCX: 00007f3566f9e159
RDX: 0000200000000100 RSI: 0000000000008933 RDI: 0000000000000008
RBP: 00007f356703506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3567226218 R14: 00007f3567226180 R15: 00007ffc773ddec8
 </TASK>
rcu: rcu_preempt kthread starved for 8728 jiffies! g111273 f0x0 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:27496 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5526 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7277
 __schedule_loop kernel/sched/core.c:7354 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7369
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9e/0x2b0 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8 Comm: kworker/R-netns Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: netns cleanup_net
RIP: 0010:rcu_preempt_read_exit kernel/rcu/tree_plugin.h:396 [inline]
RIP: 0010:__rcu_read_unlock+0x32/0xe0 kernel/rcu/tree_plugin.h:435
Code: 41 55 41 54 53 49 bf 00 00 00 00 00 fc ff df 65 48 8b 3d 19 0a e8 11 48 8d 9f c4 04 00 00 49 89 dc 49 c1 ec 03 43 0f b6 04 3c <84> c0 75 4f ff 0b 75 1d 4c 8d b7 c8 04 00 00 4c 89 f0 48 c1 e8 03
RSP: 0018:ffffc900000067d0 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: ffff88801ded04c4 RCX: 8000000000000100
RDX: ffffc90000006801 RSI: ffffffff8e69cb98 RDI: ffff88801ded0000
RBP: 1ffffffff2242801 R08: ffffc90000006bd0 R09: 0000000000000000
R10: ffffc900000068f8 R11: fffff52000000d21 R12: 1ffff11003bda098
R13: ffffffff8177f1df R14: ffffc900000068a8 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888124cce000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f281c49476a CR3: 00000000765e2000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 rcu_read_unlock include/linux/rcupdate.h:882 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1216 [inline]
 unwind_next_frame+0x1baf/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
 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:359
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436
 alloc_slab_page mm/slub.c:3347 [inline]
 allocate_slab+0x7d/0x620 mm/slub.c:3462
 new_slab mm/slub.c:3513 [inline]
 refill_objects+0x2d5/0x350 mm/slub.c:7417
 refill_sheaf mm/slub.c:2885 [inline]
 __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774
 alloc_from_pcs mm/slub.c:4850 [inline]
 slab_alloc_node mm/slub.c:4984 [inline]
 kmem_cache_alloc_noprof+0x399/0x600 mm/slub.c:5010
 skb_ext_maybe_cow net/core/skbuff.c:7167 [inline]
 skb_ext_add+0x1b6/0x8e0 net/core/skbuff.c:7242
 nf_bridge_unshare net/bridge/br_netfilter_hooks.c:170 [inline]
 br_nf_forward_ip+0xc3/0xa30 net/bridge/br_netfilter_hooks.c:686
 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+0x23e/0x3f0 include/linux/netfilter.h:323
 __br_forward+0x397/0x540 net/bridge/br_forward.c:115
 deliver_clone net/bridge/br_forward.c:131 [inline]
 maybe_deliver net/bridge/br_forward.c:191 [inline]
 br_flood+0x3e3/0x8d0 net/bridge/br_forward.c:245
 br_handle_frame_finish+0x1119/0x1950 net/bridge/br_input.c:229
 br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1
 br_nf_pre_routing_finish_ipv6+0x90c/0xc40 net/bridge/br_netfilter_ipv6.c:-1
 NF_HOOK include/linux/netfilter.h:325 [inline]
 br_nf_pre_routing_ipv6+0x382/0x6f0 net/bridge/br_netfilter_ipv6.c:183
 nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
 br_handle_frame+0x1329/0x1600 net/bridge/br_input.c:451
 __netif_receive_skb_core+0x989/0x30c0 net/core/dev.c:6151
 __netif_receive_skb_one_core net/core/dev.c:6262 [inline]
 __netif_receive_skb net/core/dev.c:6377 [inline]
 process_backlog+0x727/0x18b0 net/core/dev.c:6728
 __napi_poll+0xaa/0x330 net/core/dev.c:7787
 napi_poll net/core/dev.c:7850 [inline]
 net_rx_action+0x61d/0xf50 net/core/dev.c:8007
 handle_softirqs+0x226/0x860 kernel/softirq.c:645
 __do_softirq kernel/softirq.c:679 [inline]
 invoke_softirq kernel/softirq.c:519 [inline]
 __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
 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:arch_try_cmpxchg128 arch/x86/include/asm/cmpxchg_64.h:-1 [inline]
RIP: 0010:__update_freelist_fast mm/slub.c:668 [inline]
RIP: 0010:slab_update_freelist mm/slub.c:734 [inline]
RIP: 0010:__slab_free+0xc3/0x2c0 mm/slub.c:5774
Code: f6 74 41 45 31 e4 41 f6 46 0a 40 74 66 48 8b 44 24 50 48 8b 54 24 58 48 89 de 48 8b 5c 24 40 48 8b 4c 24 48 f0 48 0f c7 4e 20 <48> 89 f3 0f 84 e8 00 00 00 48 89 44 24 50 48 89 54 24 58 f3 90 e9
RSP: 0018:ffffc900000d75e0 EFLAGS: 00000242
RAX: ffff888062233c00 RBX: ffff888062233b00 RCX: 000000020010000c
RDX: 000000020010000d RSI: ffffea0001888cc0 RDI: ffff88801fae6000
RBP: ffffc900000d7680 R08: 0000000000000000 R09: ffffffff8237ec4e
R10: dffffc0000000000 R11: fffffbfff20f4890 R12: 0000000000000000
R13: ffff888062233c00 R14: ffff88801fae6000 R15: 0000000000000000
 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:5414 [inline]
 __kvmalloc_node_noprof+0x50f/0x820 mm/slub.c:7014
 allocate_hook_entries_size net/netfilter/core.c:54 [inline]
 __nf_hook_entries_try_shrink+0x34e/0x720 net/netfilter/core.c:253
 __nf_unregister_net_hook+0x4be/0x6d0 net/netfilter/core.c:513
 nf_unregister_net_hook net/netfilter/core.c:-1 [inline]
 nf_unregister_net_hooks+0xcb/0x140 net/netfilter/core.c:606
 ops_pre_exit_list net/core/net_namespace.c:161 [inline]
 ops_undo_list+0x17d/0x8d0 net/core/net_namespace.c:235
 cleanup_net+0x572/0x810 net/core/net_namespace.c:706
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 rescuer_thread+0x7c5/0x10e0 kernel/workqueue.c:3703
 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>