rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6172/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=13081, q=1365 ncpus=2)
task:kworker/1:7 state:R running task stack:27336 pid:6172 tgid:6172 ppid:2 task_flags:0x4208060 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256
irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_read_lock include/linux/rcupdate.h:868 [inline]
RIP: 0010:class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
RIP: 0010:unwind_next_frame+0xc6/0x2390 arch/x86/kernel/unwind_orc.c:479
Code: 33 00 4c 8d 3d 00 00 00 00 48 c7 c7 e0 d6 f3 8d 31 f6 31 d2 b9 02 00 00 00 45 31 c0 45 31 c9 41 57 e8 ee c4 29 00 48 83 c4 08 65 fc d2 09 85 c0 74 3a e8 9c c2 32 00 84 c0 75 31 e8 53 fc d2
RSP: 0018:ffffc9000b327238 EFLAGS: 00000282
RAX: f0bcec01f22d7700 RBX: ffffffff821a7538 RCX: f0bcec01f22d7700
RDX: 0000000000000000 RSI: ffffffff8d8f50ca RDI: ffffffff8bbf08e0
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff81738c45
R10: ffffc9000b327358 R11: ffffffff81ac2e10 R12: 1ffff92001664e61
R13: ffffc9000b327340 R14: ffffc9000b327308 R15: ffffffff81738c45
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
save_stack+0xf5/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:311
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901
discard_slab mm/slub.c:3330 [inline]
__put_partials+0x146/0x170 mm/slub.c:3876
put_cpu_partial+0x1f2/0x2e0 mm/slub.c:3951
__slab_free+0x2b9/0x390 mm/slub.c:5929
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_kmalloc+0x22/0xb0 mm/kasan/common.c:408
kasan_kmalloc include/linux/kasan.h:262 [inline]
__do_kmalloc_node mm/slub.c:5650 [inline]
__kmalloc_node_track_caller_noprof+0x568/0x800 mm/slub.c:5759
kvasprintf+0xdc/0x190 lib/kasprintf.c:25
__kthread_create_on_node+0x1c6/0x3e0 kernel/kthread.c:519
kthread_create_on_node+0xdd/0x130 kernel/kthread.c:587
create_worker+0x299/0x720 kernel/workqueue.c:2802
maybe_create_worker kernel/workqueue.c:3063 [inline]
manage_workers kernel/workqueue.c:3140 [inline]
worker_thread+0x33e/0xda0 kernel/workqueue.c:3402
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: rcu_preempt kthread starved for 6471 jiffies! g13081 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:27224 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7026
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5148 Comm: kworker/u9:1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: krxrpcd rxrpc_peer_keepalive_worker
RIP: 0010:skb_put+0x128/0x210 net/core/skbuff.c:2584
Code: 85 e5 00 00 00 45 8b 24 24 89 ef 44 89 e6 e8 7f 30 a0 f8 44 39 e5 77 1f e8 b5 2e a0 f8 49 01 df 4c 89 f8 48 83 c4 10 5b 41 5c <41> 5d 41 5e 41 5f 5d e9 7c 8f 29 02 cc e8 96 2e a0 f8 4c 8b 7c 24
RSP: 0018:ffffc90000007138 EFLAGS: 00000286
RAX: ffff88804f38c168 RBX: 0000000000000014 RCX: ffff88803319bc80
RDX: 0000000000000100 RSI: 0000000000000180 RDI: 000000000000017c
RBP: 000000000000017c R08: 00000000000080fe R09: 0c00000000000000
R10: 00000000000080fe R11: 0c00000000000000 R12: dffffc0000000000
R13: 0000000000000014 R14: ffff888050275640 R15: ffff88804f38c168
FS: 0000000000000000(0000) GS:ffff88812613b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000b1030 CR3: 0000000077ca2000 CR4: 00000000003526f0
Call Trace:
synproxy_send_client_synack_ipv6+0x3f9/0xca0 net/netfilter/nf_synproxy_core.c:882
nft_synproxy_eval_v6+0x36e/0x560 net/netfilter/nft_synproxy.c:90
nft_synproxy_do_eval+0x3d7/0x570 net/netfilter/nft_synproxy.c:145
expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
nft_do_chain+0x40c/0x1920 net/netfilter/nf_tables_core.c:285
nft_do_chain_inet+0x25d/0x340 net/netfilter/nft_chain_filter.c:161
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:623
nf_hook include/linux/netfilter.h:273 [inline]
NF_HOOK+0x206/0x3a0 include/linux/netfilter.h:316
ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:500
NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318
__netif_receive_skb_one_core net/core/dev.c:6079 [inline]
__netif_receive_skb+0xd3/0x380 net/core/dev.c:6192
process_backlog+0x60e/0x14f0 net/core/dev.c:6544
__napi_poll+0xc7/0x360 net/core/dev.c:7594
napi_poll net/core/dev.c:7657 [inline]
net_rx_action+0x5f7/0xdf0 net/core/dev.c:7784
handle_softirqs+0x286/0x870 kernel/softirq.c:622
do_softirq+0xec/0x180 kernel/softirq.c:523
__local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:450
spin_unlock_bh include/linux/spinlock.h:396 [inline]
rxrpc_peer_keepalive_worker+0x45a/0xde0 net/rxrpc/peer_event.c:337
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245