rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P3488/2:b..l P3537/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=13869, q=629 ncpus=2)
task:kworker/u8:10 state:R running task stack:24408 pid:3537 tgid:3537 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound cfg80211_wiphy_work
Call Trace:
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7193
irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_is_watching+0x0/0xb0 kernel/rcu/tree.c:747
Code: c7 c7 20 42 14 8e e8 2f 65 21 03 eb cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 41 57 41 56 53 65 ff 05 90 18 f8 10 e8 7b 36 b6 09 89
RSP: 0018:ffffc9000c597170 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff90347401 RCX: ffff888031179e80
RDX: ffffc9000c597201 RSI: dffffc0000000000 RDI: ffffc9000c5972b0
RBP: dffffc0000000000 R08: ffffc9000c597330 R09: 0000000000000000
R10: ffffc9000c5972f8 R11: fffff520018b2e61 R12: ffffc9000c597340
R13: ffffc9000c590000 R14: ffffc9000c5972a8 R15: ffffffff81742f85
rcu_read_unlock include/linux/rcupdate.h:895 [inline]
class_rcu_destructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0x1a6d/0x23d0 arch/x86/kernel/unwind_orc.c:695
__unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:773
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6674 [inline]
kfree+0x1c0/0x660 mm/slub.c:6882
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1576 [inline]
ieee80211_ibss_rx_queued_mgmt+0x1206/0x2af0 net/mac80211/ibss.c:1602
ieee80211_iface_process_skb net/mac80211/iface.c:1736 [inline]
ieee80211_iface_work+0x85f/0x12d0 net/mac80211/iface.c:1790
cfg80211_wiphy_work+0x2ab/0x450 net/wireless/core.c:438
process_one_work+0x93a/0x15a0 kernel/workqueue.c:3279
process_scheduled_works kernel/workqueue.c:3362 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3443
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
task:kworker/u8:9 state:R running task stack:24920 pid:3488 tgid:3488 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound linkwatch_event
Call Trace:
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7193
irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:deref_stack_reg+0x1cd/0x230 arch/x86/kernel/unwind_orc.c:424
Code: 8b 5c 24 18 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 e3 0a b4 00 4c 89 33 b0 01 eb 02 31 c0 48 83 c4 20 5b 41 5c <41> 5d 41 5e 41 5f 5d e9 17 45 ec 09 cc 44 89 f9 80 e1 07 80 c1 03
RSP: 0018:ffffc9000bf06c10 EFLAGS: 00000286
RAX: 1ffff920017e0d01 RBX: ffffffff9036eee6 RCX: 0000000000000001
RDX: ffffc9000bf06d48 RSI: dffffc0000000000 RDI: ffffc9000bf07e30
RBP: 1ffff920017e0da1 R08: ffffc9000bf07e30 R09: 0000000000000000
R10: ffffc9000bf06d58 R11: fffff520017e0dad R12: ffffc9000bf06d58
R13: 1ffff920017e0da3 R14: ffffc9000bf07f38 R15: dffffc0000000000
unwind_next_frame+0x18cc/0x23d0 arch/x86/kernel/unwind_orc.c:-1
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
save_netdev_trace_buffer+0xd7/0x5a0 net/core/dev.c:13435
__dev_hold include/linux/netdevice.h:4400 [inline]
netdev_hold include/linux/netdevice.h:4443 [inline]
dev_hold include/linux/netdevice.h:4466 [inline]
dev_get_by_index+0x1b3/0x2f0 net/core/dev.c:983
netdev_get_by_index+0x25/0xb0 net/core/dev.c:1006
fib6_nh_init+0x1cd/0x2020 net/ipv6/route.c:3590
ip6_route_info_create_nh+0x16a/0xab0 net/ipv6/route.c:3890
ip6_route_add+0x6e/0x1b0 net/ipv6/route.c:3942
addrconf_add_mroute net/ipv6/addrconf.c:2552 [inline]
addrconf_add_dev+0x23f/0x320 net/ipv6/addrconf.c:2570
addrconf_dev_config net/ipv6/addrconf.c:3479 [inline]
addrconf_init_auto_addrs+0x511/0xa00 net/ipv6/addrconf.c:3567
addrconf_notify+0xb1e/0x1050 net/ipv6/addrconf.c:3740
notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85
netif_state_change+0x26f/0x380 net/core/dev.c:1584
linkwatch_do_dev+0x124/0x180 net/core/link_watch.c:186
__linkwatch_run_queue+0x56a/0x7e0 net/core/link_watch.c:244
linkwatch_event+0x4c/0x60 net/core/link_watch.c:304
process_one_work+0x93a/0x15a0 kernel/workqueue.c:3279
process_scheduled_works kernel/workqueue.c:3362 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3443
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: rcu_preempt kthread starved for 10597 jiffies! g13869 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:26968 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
__schedule_loop kernel/sched/core.c:6948 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6963
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+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 33 9e 2a 00 f3 0f 1e fa fb f4 48 ee 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff8de07d80 EFLAGS: 000002c6
RAX: 524b4c9621c6ea00 RBX: ffffffff819786ba RCX: 524b4c9621c6ea00
RDX: 0000000000000001 RSI: ffffffff8d997e54 RDI: ffffffff8be07960
RBP: ffffffff8de07ea8 R08: ffff8880b86336db R09: 1ffff110170c66db
R10: dffffc0000000000 R11: ffffed10170c66dc R12: ffffffff8fa22f70
R13: 1ffffffff1bd29b8 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888125c25000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31763fff CR3: 0000000075b42000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x1ea/0x520 kernel/sched/idle.c:332
cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:430
rest_init+0x2de/0x300 init/main.c:758
start_kernel+0x3ac/0x400 init/main.c:1208
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x147