rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8073/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=45881, q=1046 ncpus=1)
task:syz.7.496 state:R running task stack:25192 pid:8073 tgid:8072 ppid:7290 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7284
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7606
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x920 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:114 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:140 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline]
RIP: 0010:kasan_check_range+0x7b/0x2c0 mm/kasan/generic.c:200
Code: 00 00 00 00 00 fc ff df 4f 8d 1c 17 49 ff c8 4d 89 c1 49 c1 e9 03 48 bb 01 00 00 00 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc <49> 83 fc 10 7f 29 4d 85 e4 0f 84 3d 01 00 00 4c 89 cb 48 f7 d3 4c
RSP: 0018:ffffc9000469f0a8 EFLAGS: 00000212
RAX: ffffc9000469f801 RBX: dffffc0000000001 RCX: ffffffff81781e54
RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc9000469f1f8
RBP: 0000000000000000 R08: ffffc9000469f207 R09: 1ffff920008d3e40
R10: dffffc0000000000 R11: fffff520008d3e3f R12: 0000000000000002
R13: ffffffff91a30f28 R14: fffff520008d3e41 R15: 1ffff920008d3e3f
__asan_memset+0x22/0x50 mm/kasan/shadow.c:84
unwind_next_frame+0xd04/0x2550 arch/x86/kernel/unwind_orc.c:621
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
save_stack+0x122/0x230 mm/page_owner.c:183
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:338
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1418 [inline]
__free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962
__slab_free+0x274/0x2c0 mm/slub.c:5823
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:361
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4683 [inline]
slab_alloc_node mm/slub.c:4996 [inline]
__kmalloc_cache_noprof+0x29f/0x600 mm/slub.c:5559
_kmalloc_noprof include/linux/slab.h:991 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
call_usermodehelper_setup+0x8e/0x270 kernel/umh.c:360
call_modprobe kernel/module/kmod.c:98 [inline]
__request_module+0x3ba/0x630 kernel/module/kmod.c:173
xt_request_find_target+0xc1/0x130 net/netfilter/x_tables.c:287
find_check_entry net/ipv6/netfilter/ip6_tables.c:563 [inline]
translate_table+0x1777/0x2110 net/ipv6/netfilter/ip6_tables.c:738
do_replace net/ipv6/netfilter/ip6_tables.c:1157 [inline]
do_ip6t_set_ctl+0xa5c/0xe30 net/ipv6/netfilter/ip6_tables.c:1648
nf_setsockopt+0x26f/0x290 net/netfilter/nf_sockopt.c:101
rawv6_setsockopt+0x276/0x5e0 net/ipv6/raw.c:1048
do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2397
__sys_setsockopt net/socket.c:2422 [inline]
__do_sys_setsockopt net/socket.c:2428 [inline]
__se_sys_setsockopt net/socket.c:2425 [inline]
__x64_sys_setsockopt+0x13d/0x1b0 net/socket.c:2425
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: 0033:0x7f296af9e199
RSP: 002b:00007f296bedd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f296b225fa0 RCX: 00007f296af9e199
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000007
RBP: 00007f296b0358e0 R08: 0000000000000590 R09: 0000000000000000
R10: 0000200000000180 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f296b226038 R14: 00007f296b225fa0 R15: 00007ffef6453f58
rcu: rcu_preempt kthread starved for 6524 jiffies! g45881 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27496 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7376
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 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:
CPU: 0 UID: 0 PID: 3220 Comm: kworker/R-bat_e Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Workqueue: bat_events batadv_dat_purge
RIP: 0010:synproxy_send_tcp+0x45a/0x670 net/netfilter/nf_synproxy_core.c:-1
Code: 8b 74 24 10 0f 84 82 00 00 00 bf fe ff ff 7f 89 ee e8 aa ae bb f7 81 fd fe ff ff 7f 77 7a e8 9d a9 bb f7 eb 05 e8 96 a9 bb f7 <49> bf 00 00 00 00 00 fc ff df 43 80 7c 3d 00 00 74 09 48 8d 7b 18
RSP: 0018:ffffc900000072d8 EFLAGS: 00000246
RAX: ffffffff8a0c65a3 RBX: ffff888176906500 RCX: ffff8880320abe80
RDX: 8000000000000100 RSI: 0000000000000100 RDI: 000000007ffffffe
RBP: 0000000000000002 R08: 0000000000000100 R09: 1ffff1100cd02c30
R10: dffffc0000000000 R11: ffffed100cd02c31 R12: 1ffff1102ed20cb0
R13: 1ffff1102ed20ca3 R14: ffff88807f198000 R15: ffff888066816183
FS: 0000000000000000(0000) GS:ffff888124cc6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555575f744e8 CR3: 000000000eb48000 CR4: 0000000000350ef0
Call Trace:
synproxy_send_client_synack+0x89b/0xde0 net/netfilter/nf_synproxy_core.c:487
nft_synproxy_eval_v4+0x362/0x4e0 net/netfilter/nft_synproxy.c:59
nft_synproxy_do_eval+0x389/0x5d0 net/netfilter/nft_synproxy.c:142
expr_call_ops_eval net/netfilter/nf_tables_core.c:232 [inline]
nft_do_chain+0x132b/0x1b10 net/netfilter/nf_tables_core.c:285
nft_do_chain_ipv4+0x195/0x290 net/netfilter/nft_chain_filter.c:24
nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619
nf_hook include/linux/netfilter.h:280 [inline]
NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:323
NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:325
__netif_receive_skb_one_core net/core/dev.c:6297 [inline]
__netif_receive_skb net/core/dev.c:6410 [inline]
process_backlog+0xa6b/0x18b0 net/core/dev.c:6761
__napi_poll+0xaa/0x330 net/core/dev.c:7830
napi_poll net/core/dev.c:7893 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:8050
handle_softirqs+0x226/0x860 kernel/softirq.c:645
do_softirq+0x77/0xd0 kernel/softirq.c:546
__local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
spin_unlock_bh include/linux/spinlock.h:407 [inline]
__batadv_dat_purge net/batman-adv/distributed-arp-table.c:252 [inline]
batadv_dat_purge+0x2d7/0x3c0 net/batman-adv/distributed-arp-table.c:271
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
rescuer_thread+0x7c5/0x10e0 kernel/workqueue.c:3703
kthread+0x38b/0x480 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