rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6411
rcu: 	(detected by 1, t=10502 jiffies, g=19469, q=592 ncpus=2)
task:syz.2.174       state:R  running task     stack:25320 pid:6411  ppid:5788   flags:0x0000400e
Call Trace:
 <IRQ>
 sched_show_task+0x49b/0x5c0 kernel/sched/core.c:9180
 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:261 [inline]
 print_other_cpu_stall+0xfb8/0x1340 kernel/rcu/tree_stall.h:637
 check_cpu_stall kernel/rcu/tree_stall.h:809 [inline]
 rcu_pending kernel/rcu/tree.c:3950 [inline]
 rcu_sched_clock_irq+0x890/0x1230 kernel/rcu/tree.c:2295
 update_process_times+0x147/0x1b0 kernel/time/timer.c:2072
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x3a2/0x580 kernel/time/tick-sched.c:1492
 __run_hrtimer kernel/time/hrtimer.c:1754 [inline]
 __hrtimer_run_queues+0x4e8/0xc10 kernel/time/hrtimer.c:1818
 hrtimer_interrupt+0x39d/0x980 kernel/time/hrtimer.c:1880
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:check_kcov_mode kernel/kcov.c:178 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x2e/0x60 kernel/kcov.c:212
Code: 48 8b 04 24 65 48 8b 0d a0 2c 7c 7e 65 8b 15 a1 2c 7c 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 24 16 00 00 00 <74> 2c 8b 91 00 16 00 00 83 fa 02 75 21 48 8b 91 08 16 00 00 48 8b
RSP: 0018:ffffc900001f0110 EFLAGS: 00000246
RAX: ffffffff813bcb5e RBX: ffffffff8f8d0b89 RCX: ffff888026e28000
RDX: 0000000000000100 RSI: 0000000000000002 RDI: ffffc900001f0e30
RBP: ffffc900001f0238 R08: ffff888026e28000 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc900001f0cc0
R13: ffffc900001f01e8 R14: ffffffff8f8d0b88 R15: dffffc0000000000
 unwind_next_frame+0x178e/0x2990 arch/x86/kernel/unwind_orc.c:648
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
 slab_alloc_node mm/slub.c:3495 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519
 __skb_ext_alloc net/core/skbuff.c:6681 [inline]
 skb_ext_add+0x145/0x8e0 net/core/skbuff.c:6784
 nf_bridge_alloc include/net/netfilter/br_netfilter.h:12 [inline]
 br_nf_pre_routing_ipv6+0x136/0x6a0 net/bridge/br_netfilter_ipv6.c:172
 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:277 [inline]
 br_handle_frame+0x1240/0x14d0 net/bridge/br_input.c:424
 __netif_receive_skb_core+0xf94/0x3ac0 net/core/dev.c:5564
 __netif_receive_skb_one_core net/core/dev.c:5668 [inline]
 __netif_receive_skb+0x74/0x290 net/core/dev.c:5784
 process_backlog+0x380/0x710 net/core/dev.c:6112
 __napi_poll+0xbb/0x460 net/core/dev.c:6674
 napi_poll net/core/dev.c:6741 [inline]
 net_rx_action+0x65f/0xcc0 net/core/dev.c:6877
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:stack_depot_save+0x0/0x10 lib/stackdepot.c:456
Code: e9 b5 fc ff ff c6 05 63 99 0f 0a 01 48 c7 c7 ed 03 84 8c e8 02 35 ea fc 0f 0b e9 05 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 <f3> 0f 1e fa b9 01 00 00 00 e9 92 f9 ff ff 66 90 f3 0f 1e fa 8b 15
RSP: 0018:ffffc9000c607198 EFLAGS: 00000246
RAX: 0000000000000010 RBX: ffff888026e28578 RCX: 4afe22453f1bc400
RDX: 0000000000002800 RSI: 0000000000000010 RDI: ffffc9000c6071e0
RBP: ffffc9000c6072d0 R08: ffffc9000c607130 R09: 000000000000000f
R10: 0000000000000004 R11: 0000000000000002 R12: dffffc0000000000
R13: 1ffff11004dc50af R14: ffffc9000c6071e0 R15: 1ffff920018c0e38
 save_stack+0x133/0x230 mm/page_owner.c:129
 __reset_page_owner+0x4e/0x190 mm/page_owner.c:149
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1182 [inline]
 free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
 mm_free_pgd kernel/fork.c:811 [inline]
 __mmdrop+0xb4/0x3d0 kernel/fork.c:927
 mmdrop include/linux/sched/mm.h:54 [inline]
 mmdrop_sched include/linux/sched/mm.h:82 [inline]
 mmdrop_lazy_tlb_sched include/linux/sched/mm.h:109 [inline]
 finish_task_switch+0x3da/0x8f0 kernel/sched/core.c:5281
 context_switch kernel/sched/core.c:5385 [inline]
 __schedule+0x15b6/0x4660 kernel/sched/core.c:6701
 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7011
 irqentry_exit+0x67/0x70 kernel/entry/common.c:441
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:should_resched arch/x86/include/asm/preempt.h:104 [inline]
RIP: 0010:__local_bh_enable_ip+0x142/0x1c0 kernel/softirq.c:413
Code: 8a e8 42 84 3e 09 65 66 8b 05 5a db b0 7e 66 85 c0 75 54 bf 01 00 00 00 e8 7b 1d 0a 00 e8 f6 1f 3b 00 fb 65 8b 05 26 db b0 7e <85> c0 75 05 e8 15 c0 ad ff 48 c7 04 24 0e 36 e0 45 4b c7 04 37 00
RSP: 0018:ffffc9000c6077e0 EFLAGS: 00000282
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 4afe22453f1bc400
RDX: dffffc0000000000 RSI: ffffffff8acacce0 RDI: ffffffff8b1d3ba0
RBP: ffffc9000c607870 R08: ffffffff8e8c316f R09: 1ffffffff1d1862d
R10: dffffc0000000000 R11: fffffbfff1d1862e R12: ffffffff88c0b90f
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff920018c0efc
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 xdp_test_run_batch net/bpf/test_run.c:361 [inline]
 bpf_test_run_xdp_live+0x18ce/0x1b30 net/bpf/test_run.c:383
 bpf_prog_test_run_xdp+0x7d8/0x1140 net/bpf/test_run.c:1326
 bpf_prog_test_run+0x31f/0x390 kernel/bpf/syscall.c:4140
 __sys_bpf+0x49d/0x890 kernel/bpf/syscall.c:5509
 __do_sys_bpf kernel/bpf/syscall.c:5595 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5593 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5593
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7faeb439e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007faeb5204028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007faeb4625fa0 RCX: 00007faeb439e159
RDX: 0000000000000048 RSI: 0000200000000600 RDI: 000000000000000a
RBP: 00007faeb443506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faeb4626038 R14: 00007faeb4625fa0 R15: 00007fff946060c8
 </TASK>
rcu: rcu_preempt kthread starved for 950 jiffies! g19469 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:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x15ae/0x4660 kernel/sched/core.c:6701
 schedule+0xbd/0x170 kernel/sched/core.c:6775
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 6411 Comm: syz.2.174 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:178 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x2e/0x60 kernel/kcov.c:212
Code: 48 8b 04 24 65 48 8b 0d a0 2c 7c 7e 65 8b 15 a1 2c 7c 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 24 16 00 00 00 <74> 2c 8b 91 00 16 00 00 83 fa 02 75 21 48 8b 91 08 16 00 00 48 8b
RSP: 0018:ffffc900001f0110 EFLAGS: 00000246
RAX: ffffffff813bcb5e RBX: ffffffff8f8d0b89 RCX: ffff888026e28000
RDX: 0000000000000100 RSI: 0000000000000002 RDI: ffffc900001f0e30
RBP: ffffc900001f0238 R08: ffff888026e28000 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc900001f0cc0
R13: ffffc900001f01e8 R14: ffffffff8f8d0b88 R15: dffffc0000000000
FS:  00007faeb52046c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdac0baedc0 CR3: 00000000756e5000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 unwind_next_frame+0x178e/0x2990 arch/x86/kernel/unwind_orc.c:648
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
 slab_alloc_node mm/slub.c:3495 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519
 __skb_ext_alloc net/core/skbuff.c:6681 [inline]
 skb_ext_add+0x145/0x8e0 net/core/skbuff.c:6784
 nf_bridge_alloc include/net/netfilter/br_netfilter.h:12 [inline]
 br_nf_pre_routing_ipv6+0x136/0x6a0 net/bridge/br_netfilter_ipv6.c:172
 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:277 [inline]
 br_handle_frame+0x1240/0x14d0 net/bridge/br_input.c:424
 __netif_receive_skb_core+0xf94/0x3ac0 net/core/dev.c:5564
 __netif_receive_skb_one_core net/core/dev.c:5668 [inline]
 __netif_receive_skb+0x74/0x290 net/core/dev.c:5784
 process_backlog+0x380/0x710 net/core/dev.c:6112
 __napi_poll+0xbb/0x460 net/core/dev.c:6674
 napi_poll net/core/dev.c:6741 [inline]
 net_rx_action+0x65f/0xcc0 net/core/dev.c:6877
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:stack_depot_save+0x0/0x10 lib/stackdepot.c:456
Code: e9 b5 fc ff ff c6 05 63 99 0f 0a 01 48 c7 c7 ed 03 84 8c e8 02 35 ea fc 0f 0b e9 05 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 <f3> 0f 1e fa b9 01 00 00 00 e9 92 f9 ff ff 66 90 f3 0f 1e fa 8b 15
RSP: 0018:ffffc9000c607198 EFLAGS: 00000246
RAX: 0000000000000010 RBX: ffff888026e28578 RCX: 4afe22453f1bc400
RDX: 0000000000002800 RSI: 0000000000000010 RDI: ffffc9000c6071e0
RBP: ffffc9000c6072d0 R08: ffffc9000c607130 R09: 000000000000000f
R10: 0000000000000004 R11: 0000000000000002 R12: dffffc0000000000
R13: 1ffff11004dc50af R14: ffffc9000c6071e0 R15: 1ffff920018c0e38
 save_stack+0x133/0x230 mm/page_owner.c:129
 __reset_page_owner+0x4e/0x190 mm/page_owner.c:149
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1182 [inline]
 free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
 mm_free_pgd kernel/fork.c:811 [inline]
 __mmdrop+0xb4/0x3d0 kernel/fork.c:927
 mmdrop include/linux/sched/mm.h:54 [inline]
 mmdrop_sched include/linux/sched/mm.h:82 [inline]
 mmdrop_lazy_tlb_sched include/linux/sched/mm.h:109 [inline]
 finish_task_switch+0x3da/0x8f0 kernel/sched/core.c:5281
 context_switch kernel/sched/core.c:5385 [inline]
 __schedule+0x15b6/0x4660 kernel/sched/core.c:6701
 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7011
 irqentry_exit+0x67/0x70 kernel/entry/common.c:441
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:should_resched arch/x86/include/asm/preempt.h:104 [inline]
RIP: 0010:__local_bh_enable_ip+0x142/0x1c0 kernel/softirq.c:413
Code: 8a e8 42 84 3e 09 65 66 8b 05 5a db b0 7e 66 85 c0 75 54 bf 01 00 00 00 e8 7b 1d 0a 00 e8 f6 1f 3b 00 fb 65 8b 05 26 db b0 7e <85> c0 75 05 e8 15 c0 ad ff 48 c7 04 24 0e 36 e0 45 4b c7 04 37 00
RSP: 0018:ffffc9000c6077e0 EFLAGS: 00000282
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 4afe22453f1bc400
RDX: dffffc0000000000 RSI: ffffffff8acacce0 RDI: ffffffff8b1d3ba0
RBP: ffffc9000c607870 R08: ffffffff8e8c316f R09: 1ffffffff1d1862d
R10: dffffc0000000000 R11: fffffbfff1d1862e R12: ffffffff88c0b90f
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff920018c0efc
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 xdp_test_run_batch net/bpf/test_run.c:361 [inline]
 bpf_test_run_xdp_live+0x18ce/0x1b30 net/bpf/test_run.c:383
 bpf_prog_test_run_xdp+0x7d8/0x1140 net/bpf/test_run.c:1326
 bpf_prog_test_run+0x31f/0x390 kernel/bpf/syscall.c:4140
 __sys_bpf+0x49d/0x890 kernel/bpf/syscall.c:5509
 __do_sys_bpf kernel/bpf/syscall.c:5595 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5593 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5593
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7faeb439e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007faeb5204028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007faeb4625fa0 RCX: 00007faeb439e159
RDX: 0000000000000048 RSI: 0000200000000600 RDI: 000000000000000a
RBP: 00007faeb443506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faeb4626038 R14: 00007faeb4625fa0 R15: 00007fff946060c8
 </TASK>