rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: (detected by 0, t=10502 jiffies, g=183149, q=845 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295052360-4295041857), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g183149 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:28040 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7322
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
kthread+0x388/0x470 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: 7318 Comm: ipvs-e:43:0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__in6_dev_get include/net/addrconf.h:348 [inline]
RIP: 0010:ip6_ignore_linkdown+0x29/0x140 include/net/addrconf.h:452
Code: 90 55 41 56 53 48 89 fb 49 be 00 00 00 00 00 fc ff df e8 2a 86 6f f7 48 81 c3 c0 00 00 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 <74> 08 48 89 df e8 ad da da f7 48 8b 1b e8 65 8a 51 01 89 c5 31 ff
RSP: 0018:ffffc90000a07658 EFLAGS: 00000246
RAX: 1ffff1101023a818 RBX: ffff8880811d40c0 RCX: ffff88807d0c0000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8880811d4000
RBP: 1ffff11007bdd819 R08: ffffc90000a07980 R09: ffffc90000a07990
R10: ffffc90000a077e0 R11: fffff52000140efe R12: 0000000000000003
R13: ffff88803deec0c8 R14: dffffc0000000000 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff88812537b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563fe5620120 CR3: 000000000e746000 CR4: 00000000003526f0
Call Trace:
find_match+0x9c/0xb40 net/ipv6/route.c:783
__find_rr_leaf+0x243/0x740 net/ipv6/route.c:872
find_rr_leaf net/ipv6/route.c:893 [inline]
rt6_select net/ipv6/route.c:937 [inline]
fib6_table_lookup+0x3c6/0xae0 net/ipv6/route.c:2255
ip6_pol_route+0x229/0x14d0 net/ipv6/route.c:2292
pol_lookup_func include/net/ip6_fib.h:669 [inline]
__fib6_rule_action net/ipv6/fib6_rules.c:240 [inline]
fib6_rule_action+0x9d7/0xc00 net/ipv6/fib6_rules.c:278
fib_rules_lookup+0x770/0xeb0 net/core/fib_rules.c:340
fib6_rule_lookup+0x1a0/0x730 net/ipv6/fib6_rules.c:115
ip6_route_input_lookup net/ipv6/route.c:2363 [inline]
ip6_route_input+0x78d/0xb20 net/ipv6/route.c:2666
ip6_rcv_finish+0x141/0x280 net/ipv6/ip6_input.c:117
ip_sabotage_in+0x1e1/0x270 net/bridge/br_netfilter_hooks.c:988
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619
nf_hook include/linux/netfilter.h:273 [inline]
NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:316
__netif_receive_skb_one_core net/core/dev.c:6206 [inline]
__netif_receive_skb net/core/dev.c:6319 [inline]
netif_receive_skb_internal net/core/dev.c:6405 [inline]
netif_receive_skb+0x278/0xbf0 net/core/dev.c:6464
NF_HOOK+0xa4/0x3a0 include/linux/netfilter.h:318
br_handle_frame_finish+0x1192/0x1990 net/bridge/br_input.c:-1
br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1
br_nf_pre_routing_finish_ipv6+0x90c/0xc40 net/bridge/br_netfilter_ipv6.c:-1
NF_HOOK include/linux/netfilter.h:318 [inline]
br_nf_pre_routing_ipv6+0x382/0x6f0 net/bridge/br_netfilter_ipv6.c:183
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
br_handle_frame+0x127f/0x1510 net/bridge/br_input.c:442
__netif_receive_skb_core+0x989/0x30b0 net/core/dev.c:6093
__netif_receive_skb_one_core net/core/dev.c:6204 [inline]
__netif_receive_skb net/core/dev.c:6319 [inline]
process_backlog+0x706/0x1860 net/core/dev.c:6670
__napi_poll+0xaa/0x330 net/core/dev.c:7729
napi_poll net/core/dev.c:7792 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:7949
handle_softirqs+0x225/0x840 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__asan_memset+0x26/0x50 mm/kasan/shadow.c:87
Code: 90 90 90 90 f3 0f 1e fa 55 41 56 53 48 89 d3 89 f5 49 89 fe 48 8b 4c 24 18 48 89 d6 ba 01 00 00 00 e8 1e e5 ff ff 84 c0 74 11 <4c> 89 f7 89 ee 48 89 da 5b 41 5e 5d e9 c9 ce 76 09 31 c0 5b 41 5e
RSP: 0018:ffffc900031af940 EFLAGS: 00000202
RAX: 1e36474c15577001 RBX: 0000000000000010 RCX: ffffffff84bc9936
RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc900031af978
RBP: 0000000000000000 R08: ffffc900031af987 R09: 1ffff92000635f30
R10: dffffc0000000000 R11: fffff52000635f31 R12: 0000000000000004
R13: ffffc900031afaa0 R14: ffffc900031af978 R15: ffffc900031afaa0
debug_object_assert_init+0x36/0x370 lib/debugobjects.c:1050
debug_timer_assert_init kernel/time/timer.c:803 [inline]
debug_assert_init kernel/time/timer.c:848 [inline]
__mod_timer+0x4b/0xed0 kernel/time/timer.c:1025
schedule_timeout+0x14d/0x2c0 kernel/time/sleep_timeout.c:98
ip_vs_estimation_kthread+0x29a6/0x38f0 net/netfilter/ipvs/ip_vs_est.c:213
kthread+0x388/0x470 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