rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5907/4:b..l.. P5598/3:b..l..
rcu: (detected by 0, t=10505 jiffies, g=16797, q=355 ncpus=2)
task:syz-executor state:R running task stack:23304 pid:5598 tgid:5598 ppid:5590 task_flags:0x40050c flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x171d/0x56f0 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:page_table_check_clear+0x2b8/0x540 mm/page_table_check.c:85
Code: be 04 00 00 00 e8 88 d3 f8 ff 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 0f 85 4d 01 00 00 45 8b 26 <31> ff 44 89 e6 e8 ae 37 86 ff 45 85 e4 0f 85 4c 02 00 00 49 8d 7e
RSP: 0018:ffffc90004d57350 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88801e187448
RBP: ffff88801e187400 R08: ffff88801e18744b R09: 1ffff11003c30e89
R10: dffffc0000000000 R11: ffffed1003c30e8a R12: 0000000000000000
R13: 0000000000000001 R14: ffff88801e187448 R15: 000000000005ce40
ptep_get_and_clear_full arch/x86/include/asm/jump_label.h:-1 [inline]
get_and_clear_full_ptes include/linux/pgtable.h:879 [inline]
zap_present_folio_ptes mm/memory.c:1742 [inline]
zap_present_ptes mm/memory.c:1824 [inline]
do_zap_pte_range mm/memory.c:1926 [inline]
zap_pte_range mm/memory.c:2028 [inline]
zap_pmd_range mm/memory.c:2114 [inline]
zap_pud_range mm/memory.c:2142 [inline]
zap_p4d_range mm/memory.c:2163 [inline]
__zap_vma_range+0x34c6/0x4a50 mm/memory.c:2203
unmap_vmas+0x38b/0x550 mm/memory.c:2272
exit_mmap+0x290/0xa40 mm/mmap.c:1315
__mmput+0xcb/0x3d0 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+0x136a/0x1430 kernel/signal.c:3113
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: 0033:0x7f263991a6d7
RSP: 002b:00007ffc87accd30 EFLAGS: 00000202 ORIG_RAX: 000000000000003d
RAX: fffffffffffffe00 RBX: 000055555db6c500 RCX: 00007f263991a6d7
RDX: 0000000040000000 RSI: 00007ffc87accd8c RDI: ffffffffffffffff
RBP: 00007ffc87accd8c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffc87accfe8 R15: 0000000000000000
task:kworker/0:8 state:R running task stack:24216 pid:5907 tgid:5907 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: wg-crypt-wg1 wg_packet_tx_worker
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x171d/0x56f0 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:__seqprop_spinlock_sequence include/linux/seqlock.h:228 [inline]
RIP: 0010:read_seqbegin include/linux/seqlock.h:838 [inline]
RIP: 0010:neigh_hh_output include/net/neighbour.h:508 [inline]
RIP: 0010:neigh_output include/net/neighbour.h:552 [inline]
RIP: 0010:ip_finish_output2+0x889/0x1100 net/ipv4/ip_output.c:236
Code: 02 00 00 0f 85 09 02 00 00 e8 93 5c f2 f7 48 8b 5c 24 48 4d 85 ff 75 07 e8 84 5c f2 f7 eb 06 e8 7d 5c f2 f7 fb 48 8b 44 24 50 <0f> b6 04 28 84 c0 0f 85 99 00 00 00 48 8b 44 24 08 44 8b 20 44 89
RSP: 0018:ffffc90005c37660 EFLAGS: 00000293
RAX: 1ffff110057cfe57 RBX: ffff88802be7f2b0 RCX: ffff888032f78000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff21ab298 R12: 0000000000000000
R13: ffff888061167000 R14: ffff88802be7f2c0 R15: 0000000000000200
NF_HOOK_COND include/linux/netfilter.h:314 [inline]
ip_output+0x29f/0x450 net/ipv4/ip_output.c:437
iptunnel_xmit+0x61b/0xd70 net/ipv4/ip_tunnel_core.c:97
udp_tunnel_xmit_skb+0x29b/0x3e0 net/ipv4/udp_tunnel_core.c:187
send4+0xa47/0xec0 drivers/net/wireguard/socket.c:85
wg_socket_send_skb_to_peer+0xe8/0x200 drivers/net/wireguard/socket.c:174
wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline]
wg_packet_tx_worker+0x1c3/0x7d0 drivers/net/wireguard/send.c:276
process_one_work kernel/workqueue.c:3495 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
kthread+0x38b/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
rcu: rcu_preempt kthread timer wakeup didn't happen for 10148 jiffies! g16797 f0x0 RCU_GP_WAIT_FQS(5) ->state=I
rcu: Possible timer handling issue on cpu=1 timer-softirq=7071
rcu: rcu_preempt kthread starved for 10151 jiffies! g16797 f0x0 RCU_GP_WAIT_FQS(5) ->state=I ->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:I stack:27784 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x171d/0x56f0 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/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
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: 6143 Comm: syz.4.68 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:127 [inline]
RIP: 0010:lock_release+0x93/0x3c0 kernel/locking/lockdep.c:5960
Code: 0f 85 17 02 00 00 65 4c 8b 3d d1 b4 2d 12 41 83 bf 0c 0c 00 00 00 0f 85 01 02 00 00 49 81 3e a0 69 92 94 0f 84 f4 01 00 00 9c <5b> fa 48 c7 c7 a6 61 b1 8d e8 df 49 d1 09 65 ff 05 48 fd 2d 12 c7
RSP: 0018:ffffc90004f17370 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88801bbda588 RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8bed2a60 RDI: ffffffff8bed2a20
RBP: 0000000000000002 R08: ffffffff90d594bf R09: 1ffffffff21ab297
R10: dffffc0000000000 R11: fffffbfff21ab298 R12: 1ffff110056ecc50
R13: ffffffff8b768a99 R14: ffffffff8f3c1600 R15: ffff88802b765dc0
FS: 00007f5ee413e6c0(0000) GS:ffff888124816000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5c3b368ea7 CR3: 000000003530c000 CR4: 00000000003526f0
Call Trace:
rcu_lock_release include/linux/rcupdate.h:319 [inline]
rcu_read_unlock include/linux/rcupdate.h:880 [inline]
rt_spin_unlock+0x165/0x200 kernel/locking/spinlock_rt.c:102
page_pool_producer_unlock include/linux/ptr_ring.h:-1 [inline]
page_pool_recycle_in_ring net/core/page_pool.c:802 [inline]
page_pool_put_unrefed_netmem+0x74c/0xa30 net/core/page_pool.c:920
dev_map_enqueue_multi+0x10c3/0x11f0 kernel/bpf/devmap.c:700
__xdp_do_redirect_frame net/core/filter.c:4676 [inline]
xdp_do_redirect_frame+0x4db/0x650 net/core/filter.c:4734
xdp_test_run_batch net/bpf/test_run.c:329 [inline]
bpf_test_run_xdp_live+0xdf0/0x1c20 net/bpf/test_run.c:378
bpf_prog_test_run_xdp+0x7d8/0x11d0 net/bpf/test_run.c:1469
bpf_prog_test_run+0x2cb/0x340 kernel/bpf/syscall.c:4860
__sys_bpf+0xb1e/0xe00 kernel/bpf/syscall.c:6478
__do_sys_bpf kernel/bpf/syscall.c:6582 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6579 [inline]
__x64_sys_bpf+0xba/0xd0 kernel/bpf/syscall.c:6579
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: 0033:0x7f5ee5eef559
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:00007f5ee413e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f5ee6175fa0 RCX: 00007f5ee5eef559
RDX: 0000000000000050 RSI: 0000200000000540 RDI: 000000000000000a
RBP: 00007f5ee5f86b50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5ee6176038 R14: 00007f5ee6175fa0 R15: 00007fffb1499578