rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P2/1:b..l P5182/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=30805, q=239 ncpus=2)
task:klogd state:R running task stack:24240 pid:5182 tgid:5182 ppid:1 task_flags:0x400100 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0xf43/0x5890 kernel/sched/core.c:6765
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7087
irqentry_exit+0x36/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:stack_trace_consume_entry+0xf7/0x170 kernel/stacktrace.c:95
Code: 89 ea 48 c1 ea 03 80 3c 02 00 75 64 48 89 75 00 8b 43 08 39 43 10 0f 92 c0 48 83 c4 08 5b 5d c3 cc cc cc cc 83 e8 01 89 43 0c <48> 83 c4 08 b8 01 00 00 00 5b 5d c3 cc cc cc cc 48 89 34 24 e8 a0
RSP: 0018:ffffc900046574a0 EFLAGS: 00000202
RAX: 0000000000000002 RBX: ffffc90004657580 RCX: ffffc90004657558
RDX: 0000000000000000 RSI: ffffffff81a5b155 RDI: ffffc9000465758c
RBP: 0000000000000000 R08: ffffc900046574f4 R09: ffffffff90f48f4a
R10: ffffc900046574c0 R11: 000000000000606d R12: ffffffff81a5adc0
R13: ffffc90004657580 R14: 0000000000000000 R15: ffff88807a97c880
arch_stack_walk+0x86/0x100 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
save_stack+0x162/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x8d/0x400 mm/page_owner.c:297
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1127 [inline]
free_frozen_pages+0x6db/0xfb0 mm/page_alloc.c:2660
__put_partials+0x14c/0x170 mm/slub.c:3153
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
__kasan_kmalloc+0x8a/0xb0 mm/kasan/common.c:385
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4294 [inline]
__kmalloc_node_track_caller_noprof+0x222/0x510 mm/slub.c:4313
kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:537
__alloc_skb+0x164/0x380 net/core/skbuff.c:606
alloc_skb include/linux/skbuff.h:1331 [inline]
alloc_skb_with_frags+0xe4/0x850 net/core/skbuff.c:6522
sock_alloc_send_pskb+0x7f1/0x980 net/core/sock.c:2914
unix_dgram_sendmsg+0x45e/0x1880 net/unix/af_unix.c:2017
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:733 [inline]
__sys_sendto+0x488/0x4f0 net/socket.c:2187
__do_sys_sendto net/socket.c:2194 [inline]
__se_sys_sendto net/socket.c:2190 [inline]
__x64_sys_sendto+0xe0/0x1c0 net/socket.c:2190
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdd565439b5
RSP: 002b:00007ffd337f4308 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdd565439b5
RDX: 000000000000005f RSI: 00005640e38ee770 RDI: 0000000000000003
RBP: 00005640e38e62c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013
R13: 00007fdd566d1212 R14: 00007ffd337f4408 R15: 0000000000000000
task:kthreadd state:R running task stack:26400 pid:2 tgid:2 ppid:0 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0xf43/0x5890 kernel/sched/core.c:6765
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6944
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
unwind_next_frame+0x1776/0x20c0 arch/x86/kernel/unwind_orc.c:672
arch_stack_walk+0x95/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
save_stack+0x162/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x8d/0x400 mm/page_owner.c:297
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1127 [inline]
free_frozen_pages+0x6db/0xfb0 mm/page_alloc.c:2660
__put_partials+0x14c/0x170 mm/slub.c:3153
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4115 [inline]
slab_alloc_node mm/slub.c:4164 [inline]
kmem_cache_alloc_noprof+0x226/0x3d0 mm/slub.c:4171
copy_sighand+0x43/0x2c0 kernel/fork.c:1822
copy_process+0x272c/0x8c50 kernel/fork.c:2397
kernel_clone+0xfd/0x960 kernel/fork.c:2815
kernel_thread+0xd5/0x120 kernel/fork.c:2877
create_kthread kernel/kthread.c:487 [inline]
kthreadd+0x4ef/0x7d0 kernel/kthread.c:847
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: rcu_preempt kthread starved for 10502 jiffies! g30805 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:27072 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0xf43/0x5890 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6857
schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2024
rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2226
kthread+0x3af/0x750 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.14.0-rc7-syzkaller-00069-g81e4f8d68c66 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 a6 ac 3c f6 48 89 df e8 fe 2b 3d f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 45 01 2e f6 65 8b 05 06 d3 a9 74 85 c0 74 16 5b
RSP: 0018:ffffc90000006dd8 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff8880b86404c8 RCX: 1ffffffff20c44d1
RDX: 0000000000000000 RSI: ffffffff8b6cfc80 RDI: ffffffff8bd369a0
RBP: 0000000000000246 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90626a17 R11: 0000000000000005 R12: ffff888226887c80
R13: ffff8880b86404c0 R14: ffff8880b86404b0 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb062781a0a CR3: 0000000077e14000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
backlog_unlock_irq_restore net/core/dev.c:250 [inline]
enqueue_to_backlog+0x373/0xe60 net/core/dev.c:5111
netif_rx_internal+0x108/0x5f0 net/core/dev.c:5419
__netif_rx+0x88/0xb0 net/core/dev.c:5439
loopback_xmit+0x284/0x700 drivers/net/loopback.c:89
__netdev_start_xmit include/linux/netdevice.h:5151 [inline]
netdev_start_xmit include/linux/netdevice.h:5160 [inline]
xmit_one net/core/dev.c:3800 [inline]
dev_hard_start_xmit+0x9a/0x7b0 net/core/dev.c:3816
__dev_queue_xmit+0x7f0/0x43e0 net/core/dev.c:4652
dev_queue_xmit include/linux/netdevice.h:3313 [inline]
neigh_hh_output include/net/neighbour.h:523 [inline]
neigh_output include/net/neighbour.h:537 [inline]
ip6_finish_output2+0xed9/0x20a0 net/ipv6/ip6_output.c:141
__ip6_finish_output net/ipv6/ip6_output.c:215 [inline]
ip6_finish_output+0x3f9/0x1360 net/ipv6/ip6_output.c:226
NF_HOOK_COND include/linux/netfilter.h:303 [inline]
ip6_output+0x1f8/0x540 net/ipv6/ip6_output.c:247
dst_output include/net/dst.h:459 [inline]
ip6_local_out+0xcd/0x4a0 net/ipv6/output_core.c:155
synproxy_send_tcp_ipv6+0x5a5/0x690 net/netfilter/nf_synproxy_core.c:851
synproxy_send_client_synack_ipv6+0x636/0x7e0 net/netfilter/nf_synproxy_core.c:897
nft_synproxy_eval_v6 net/netfilter/nft_synproxy.c:90 [inline]
nft_synproxy_do_eval+0x923/0xd60 net/netfilter/nft_synproxy.c:145
expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]
nft_do_chain+0x2e6/0x18f0 net/netfilter/nf_tables_core.c:288
nft_do_chain_inet+0x18b/0x350 net/netfilter/nft_chain_filter.c:161
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_slow+0xbb/0x200 net/netfilter/core.c:626
nf_hook.constprop.0+0x42e/0x750 include/linux/netfilter.h:269
NF_HOOK include/linux/netfilter.h:312 [inline]
ip6_input+0xe0/0x2f0 net/ipv6/ip6_input.c:491
dst_input include/net/dst.h:469 [inline]
ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
ipv6_rcv+0x265/0x680 net/ipv6/ip6_input.c:309
__netif_receive_skb_one_core+0x12e/0x1e0 net/core/dev.c:5896
__netif_receive_skb+0x1d/0x160 net/core/dev.c:6009
process_backlog+0x443/0x15f0 net/core/dev.c:6357
__napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:7191
napi_poll net/core/dev.c:7260 [inline]
net_rx_action+0xa94/0x1010 net/core/dev.c:7382
handle_softirqs+0x213/0x8f0 kernel/softirq.c:561
__do_softirq kernel/softirq.c:595 [inline]
invoke_softirq kernel/softirq.c:435 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:662
irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:92 [inline]
RIP: 0010:acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:112
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 05 08 38 ac 74 48 8b 00 a8 08 75 0c 66 90 0f 00 2d f8 1b 87 00 fb f4 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff8de07d70 EFLAGS: 00000246
RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff8b578469
RDX: 0000000000000001 RSI: ffff888141693000 RDI: ffff888141693064
RBP: ffff888141693064 R08: 0000000000000001 R09: ffffed10170c6f85
R10: ffff8880b8637c2b R11: 0000000000000000 R12: ffff88801e73b800
R13: ffffffff8ee2eba0 R14: 0000000000000000 R15: 0000000000000000
acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:699
cpuidle_enter_state+0xaa/0x4f0 drivers/cpuidle/cpuidle.c:268
cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:389
cpuidle_idle_call kernel/sched/idle.c:230 [inline]
do_idle+0x310/0x3f0 kernel/sched/idle.c:325
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
rest_init+0x16b/0x2b0 init/main.c:743
start_kernel+0x3e9/0x4d0 init/main.c:1099
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:515
x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:496
common_startup_64+0x13e/0x148