rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7535/1:b.el
rcu: (detected by 0, t=10502 jiffies, g=34381, q=590 ncpus=2)
task:syz-executor state:R running task stack:24672 pid:7535 tgid:7535 ppid:5081 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
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:memset_orig+0x52/0xb0 arch/x86/lib/memset_64.S:75
Code: 06 74 35 0f 1f 44 00 00 48 ff c9 48 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 <48> 8d 7f 40 75 d8 0f 1f 84 00 00 00 00 00 89 d1 83 e1 38 74 14 c1
RSP: 0018:ffffc9000fca76b8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc9000fca7700 RCX: 0000000000000001
RDX: 0000000000000080 RSI: 0000000000000000 RDI: ffffc9000fca7700
RBP: ffffc9000fca77f0 R08: ffffc9000fca777f R09: 0000000000000000
R10: ffffc9000fca7700 R11: fffff52001f94ef0 R12: dffffc0000000000
R13: 1ffff92001f94edc R14: 1ffffd40003f8269 R15: ffff888019231810
save_stack+0x8a/0x1f0 mm/page_owner.c:148
__reset_page_owner+0x75/0x3f0 mm/page_owner.c:297
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1093 [inline]
free_unref_page+0xd22/0xea0 mm/page_alloc.c:2588
vfree+0x186/0x2e0 mm/vmalloc.c:3355
kcov_put kernel/kcov.c:429 [inline]
kcov_close+0x2b/0x50 kernel/kcov.c:525
__fput+0x24a/0x8a0 fs/file_table.c:422
task_work_run+0x24f/0x310 kernel/task_work.c:180
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xa27/0x27e0 kernel/exit.c:876
do_group_exit+0x207/0x2c0 kernel/exit.c:1025
get_signal+0x16a1/0x1740 kernel/signal.c:2909
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xc9/0x360 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff4bb76bed7
RSP: 002b:00007ffdd299b7e0 EFLAGS: 00000293 ORIG_RAX: 000000000000003d
RAX: fffffffffffffe00 RBX: 0000000000001d82 RCX: 00007ff4bb76bed7
RDX: 0000000040000000 RSI: 00007ffdd299b81c RDI: 00000000ffffffff
RBP: 00007ffdd299b81c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000000000c
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000009
rcu: rcu_preempt kthread starved for 4062 jiffies! g34381 f0x0 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:26448 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
__schedule_loop kernel/sched/core.c:6822 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6837
schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
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
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 4211 Comm: kworker/u8:8 Not tainted 6.10.0-rc7-syzkaller-00012-g34afb82a3c67 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
RIP: 0010:queued_write_lock_slowpath+0x15f/0x44a kernel/locking/qrwlock.c:85
Code: 97 e8 6a f6 f0 41 81 0f 00 01 00 00 48 8b 5c 24 08 43 0f b6 04 2e 84 c0 0f 85 94 00 00 00 41 8b 07 3d 00 01 00 00 74 27 f3 90 <43> 0f b6 04 2e 84 c0 74 eb 44 89 f9 80 e1 07 80 c1 03 38 c1 7c de
RSP: 0018:ffffc9000c26f380 EFLAGS: 00000206
RAX: 00000000000001ff RBX: 1ffff9200184de7a RCX: ffffffff8b90f6d9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8f6f9880
RBP: ffffc9000c26f430 R08: ffffffff8f6f9883 R09: 1ffffffff1edf310
R10: dffffc0000000000 R11: fffffbfff1edf311 R12: ffffc9000c26f3d0
R13: dffffc0000000000 R14: 1ffffffff1edf310 R15: ffffffff8f6f9880
FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1abb9ae866 CR3: 000000000e132000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
queued_write_lock include/asm-generic/qrwlock.h:101 [inline]
do_raw_write_lock+0x395/0x4f0 kernel/locking/spinlock_debug.c:211
___neigh_create+0xe7e/0x2470 net/core/neighbour.c:682
ip6_finish_output2+0x1629/0x1670 net/ipv6/ip6_output.c:128
ip6_finish_output+0x41e/0x810 net/ipv6/ip6_output.c:222
ip6tunnel_xmit include/net/ip6_tunnel.h:161 [inline]
udp_tunnel6_xmit_skb+0x590/0x9d0 net/ipv6/ip6_udp_tunnel.c:111
send6+0x6d8/0xaf0 drivers/net/wireguard/socket.c:152
wg_socket_send_skb_to_peer+0x115/0x1d0 drivers/net/wireguard/socket.c:178
wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
wg_packet_handshake_send_worker+0x1dd/0x330 drivers/net/wireguard/send.c:51
process_one_work kernel/workqueue.c:3248 [inline]
process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3329
worker_thread+0x86d/0xd50 kernel/workqueue.c:3409
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