rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11330/1:b..l..
rcu: (detected by 0, t=10503 jiffies, g=53045, q=1338558 ncpus=2)
task:syz.1.1327 state:R running task stack:24720 pid:11330 tgid:11308 ppid:5631 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 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:stack_access_ok arch/x86/kernel/unwind_orc.c:409 [inline]
RIP: 0010:deref_stack_reg+0xbb/0x220 arch/x86/kernel/unwind_orc.c:419
Code: 83 3f 00 0f 95 c0 4c 39 c5 0f 96 c1 20 c1 4d 39 c6 0f 97 c0 20 c8 3c 01 75 18 49 8d 40 08 48 39 e8 0f 97 c1 4c 39 f0 0f 96 c0 <84> c1 0f 85 c0 00 00 00 49 8d 7f 28 48 89 f8 48 c1 e8 03 80 3c 30
RSP: 0018:ffffc90004c9e918 EFLAGS: 00000283
RAX: ffffc90004c9f301 RBX: 1ffff92000993d41 RCX: 0000000000000001
RDX: ffffc90004c9ea48 RSI: dffffc0000000000 RDI: ffffc90004c9ea18
RBP: ffffc90004c98000 R08: ffffc90004c9f390 R09: 0000000000000000
R10: ffffc90004c9ea58 R11: fffff52000993d4d R12: 1ffff92000993d42
R13: 1ffff92000993d43 R14: ffffc90004ca0000 R15: ffffc90004c9ea08
unwind_next_frame+0x19bd/0x2550 arch/x86/kernel/unwind_orc.c:-1
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+0x73/0x2a0 mm/page_owner.c:338
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1403 [inline]
__free_frozen_pages+0xc97/0xd90 mm/page_alloc.c:2954
__slab_free+0x269/0x2c0 mm/slub.c:5926
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_kmalloc+0x22/0xb0 mm/kasan/common.c:417
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x31c/0x600 mm/slub.c:5680
_kmalloc_noprof include/linux/slab.h:991 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
crypto_larval_alloc+0x59/0x290 crypto/api.c:108
crypto_larval_add crypto/api.c:132 [inline]
crypto_larval_lookup crypto/api.c:317 [inline]
crypto_alg_mod_lookup+0x1a1/0x5d0 crypto/api.c:354
crypto_find_alg crypto/api.c:546 [inline]
crypto_alloc_tfm_node+0x135/0x3e0 crypto/api.c:583
esp_init_authenc net/ipv4/esp4.c:1059 [inline]
esp_init_state+0x615/0x1220 net/ipv4/esp4.c:1129
__xfrm_init_state+0x9dd/0x1320 net/xfrm/xfrm_state.c:3271
xfrm_state_construct net/xfrm/xfrm_user.c:987 [inline]
xfrm_add_sa+0x2f3f/0x40a0 net/xfrm/xfrm_user.c:1052
xfrm_user_rcv_msg+0x7a8/0xf30 net/xfrm/xfrm_user.c:3899
netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2584
xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3921
netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
netlink_unicast+0x8ef/0xa80 net/netlink/af_netlink.c:1361
netlink_sendmsg+0x7f0/0xb20 net/netlink/af_netlink.c:1920
sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800
__sock_sendmsg net/socket.c:818 [inline]
____sys_sendmsg+0x54e/0x850 net/socket.c:2715
___sys_sendmsg+0x2a5/0x360 net/socket.c:2769
__sys_sendmsg net/socket.c:2801 [inline]
__do_sys_sendmsg net/socket.c:2806 [inline]
__se_sys_sendmsg net/socket.c:2804 [inline]
__x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2804
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: 0033:0x7f0d75d9f559
RSP: 002b:00007f0d76c76028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f0d76026360 RCX: 00007f0d75d9f559
RDX: 0000000000000000 RSI: 0000200000000180 RDI: 0000000000000003
RBP: 00007f0d75e36b50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0d760263f8 R14: 00007f0d76026360 R15: 00007ffcfd3b9518
rcu: rcu_preempt kthread starved for 1229 jiffies! g53045 f0x2 RCU_GP_WAIT_FQS(5) ->state=R ->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:R running task stack:27496 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 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/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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 3324 Comm: kworker/u8:10 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Workqueue: bat_events batadv_tt_purge
RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline]
RIP: 0010:__lock_acquire+0xb06/0x2de0 kernel/locking/lockdep.c:5285
Code: c7 c6 f7 a0 7c 8e 67 48 0f b9 3a 90 31 c0 48 83 78 40 00 0f 84 73 1d 00 00 49 8b 45 20 25 ff 1f 00 00 48 0f a3 05 4a a0 21 14 <73> 10 48 69 c0 c8 00 00 00 48 8d 80 90 c9 66 95 eb 32 83 3d 11 30
RSP: 0018:ffffc90000a07818 EFLAGS: 00000003
RAX: 0000000000000007 RBX: 0000000002fcf7df RCX: 00000000add6e078
RDX: 000000004dbb4af1 RSI: 000000005970cd9e RDI: ffff888033babe80
RBP: 03813abc00000000 R08: ffffffff817879cf R09: 0000000000000000
R10: ffffc90000a07af8 R11: ffffffff81b3a880 R12: 0000000000004000
R13: ffff888033bacaf8 R14: ffff888033bacaf8 R15: 0000000000000005
FS: 0000000000000000(0000) GS:ffff88812371f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557ff05a38 CR3: 000000007eede000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:351 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:377
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4720 [inline]
slab_alloc_node mm/slub.c:5033 [inline]
kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5047
dst_alloc+0x105/0x170 net/core/dst.c:90
rt_dst_alloc net/ipv4/route.c:1690 [inline]
__mkroute_output net/ipv4/route.c:2693 [inline]
ip_route_output_key_hash_rcu+0x14ac/0x2720 net/ipv4/route.c:2913
ip_route_output_key_hash+0x18d/0x2a0 net/ipv4/route.c:2743
__ip_route_output_key include/net/route.h:175 [inline]
ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2970
ip_route_output_key include/net/route.h:185 [inline]
ip_route_me_harder+0x762/0xfe0 net/ipv4/netfilter.c:54
synproxy_send_tcp+0x332/0x670 net/netfilter/nf_synproxy_core.c:434
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:237 [inline]
nft_do_chain+0x48d/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:633
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:6433 [inline]
__netif_receive_skb net/core/dev.c:6546 [inline]
process_backlog+0xa6b/0x18b0 net/core/dev.c:6897
__napi_poll+0xaa/0x330 net/core/dev.c:7977
napi_poll net/core/dev.c:8040 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:8197
handle_softirqs+0x265/0x8d0 kernel/softirq.c:669
do_softirq+0x77/0xd0 kernel/softirq.c:569
__local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
spin_unlock_bh include/linux/spinlock.h:407 [inline]
batadv_tt_local_purge+0x277/0x300 net/batman-adv/translation-table.c:1848
batadv_tt_purge+0x35/0xa40 net/batman-adv/translation-table.c:4332
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/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