rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P12/2:b..l P29/2:b..l P1509/1:b..l P43/2:b..l P5800/1:b..l P17/1:b..l P4262/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=9641, q=525 ncpus=2)
task:kworker/u8:14 state:R running task stack:23624 pid:4262 tgid:4262 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x14de/0x5210 kernel/sched/core.c:6907
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7091
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
class_preempt_destructor include/linux/preempt.h:468 [inline]
raw_spin_unlock_irqrestore_wake include/linux/sched/wake_q.h:102 [inline]
rtlock_slowlock kernel/locking/rtmutex.c:1896 [inline]
rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
__rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
rt_spin_lock+0x316/0x400 kernel/locking/spinlock_rt.c:57
spin_lock_bh include/linux/spinlock_rt.h:90 [inline]
__ip6_ins_rt net/ipv6/route.c:1350 [inline]
ip6_ins_rt+0xd4/0x160 net/ipv6/route.c:1361
__ipv6_ifa_notify+0x4e8/0xc60 net/ipv6/addrconf.c:6283
ipv6_ifa_notify net/ipv6/addrconf.c:6322 [inline]
addrconf_dad_completed+0x1b5/0xe60 net/ipv6/addrconf.c:4320
addrconf_dad_work+0xdc4/0x1680 include/linux/rwlock_rt.h:-1
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
task:pr/legacy state:R running task stack:28312 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x14de/0x5210 kernel/sched/core.c:6907
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7091
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
class_preempt_destructor include/linux/preempt.h:468 [inline]
__migrate_enable include/linux/sched.h:2384 [inline]
migrate_enable include/linux/sched.h:2424 [inline]
rt_spin_unlock+0xf0/0x200 kernel/locking/spinlock_rt.c:81
spin_unlock_irqrestore include/linux/spinlock_rt.h:129 [inline]
uart_port_unlock_irqrestore include/linux/serial_core.h:788 [inline]
serial8250_console_write+0x108a/0x1b90 drivers/tty/serial/8250/8250_port.c:3371
console_emit_next_record kernel/printk/printk.c:3111 [inline]
console_flush_one_record+0x68b/0xb90 kernel/printk/printk.c:3217
legacy_kthread_func+0x1b6/0x250 kernel/printk/printk.c:3676
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
task:syz-executor state:R running task stack:22296 pid:5800 tgid:5800 ppid:5789 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x14de/0x5210 kernel/sched/core.c:6907
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7091
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
rt_mutex_wake_up_q kernel/locking/rtmutex.c:575 [inline]
rt_mutex_slowunlock+0x681/0x8b0 kernel/locking/rtmutex.c:1469
spin_unlock_irqrestore include/linux/spinlock_rt.h:129 [inline]
unlock_task_sighand include/linux/sched/signal.h:748 [inline]
do_send_sig_info kernel/signal.c:1270 [inline]
group_send_sig_info+0x225/0x250 kernel/signal.c:1419
__kill_pgrp_info kernel/signal.c:1435 [inline]
kill_something_info kernel/signal.c:1585 [inline]
__do_sys_kill kernel/signal.c:3953 [inline]
__se_sys_kill+0x392/0x460 kernel/signal.c:3947
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb18aa9d5a7
RSP: 002b:00007ffee4e1df38 EFLAGS: 00000293 ORIG_RAX: 000000000000003e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fb18aa9d5a7
RDX: 0000000000000bb8 RSI: 0000000000000009 RDI: 00000000fffffffd
RBP: 00007ffee4e1df7c R08: 7fffffffffffffff R09: 0000000000000000
R10: 4000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000064 R14: 0000000000016b74 R15: 00007ffee4e1dfd0
task:kworker/u8:2 state:R running task stack:21728 pid:43 tgid:43 ppid:2 task_flags:0x4208160 flags:0x00080000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x14de/0x5210 kernel/sched/core.c:6907
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234
irqentry_exit+0x599/0x620 kernel/entry/common.c:239
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:batadv_tt_local_set_flags net/batman-adv/translation-table.c:3560 [inline]
RIP: 0010:batadv_tt_local_commit_changes_nolock+0x1ad/0xdb0 net/batman-adv/translation-table.c:3643
Code: f6 45 85 ff 0f 84 00 04 00 00 45 31 f6 48 8b 44 24 38 48 c1 e8 03 48 89 44 24 48 48 89 5c 24 20 48 8b 44 24 48 42 80 3c 28 00 <48> 8b 5c 24 38 74 08 48 89 df e8 64 0f 47 f7 4c 89 74 24 28 4e 8d
RSP: 0018:ffffc90000b477c0 EFLAGS: 00000246
RAX: 1ffff11006ea6f48 RBX: ffff888037537a50 RCX: ffff88801fac3c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000b478d0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100bde9386 R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000000000306 R15: ffff888036812518
batadv_tt_local_commit_changes+0x3c/0x60 net/batman-adv/translation-table.c:3667
batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:819 [inline]
batadv_iv_ogm_schedule+0x29d/0xf60 net/batman-adv/bat_iv_ogm.c:873
batadv_iv_send_outstanding_bat_ogm_packet+0x6c8/0x7e0 net/batman-adv/bat_iv_ogm.c:1709
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
task:kworker/u8:7 state:R running task stack:22272 pid:1509 tgid:1509 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound cfg80211_wiphy_work
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x14de/0x5210 kernel/sched/core.c:6907
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234
irqentry_exit+0x599/0x620 kernel/entry/common.c:239
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x221/0x330 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 71 44 73 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 db a1 89 10 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 80 02 77 09 cc 48 8d 3d b8 33 ad
RSP: 0000:ffffc9000588f1f8 EFLAGS: 00000282
RAX: c22158d2278d3e00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000006405af2e RSI: ffffffff8d5a1617 RDI: ffffffff8b861580
RBP: ffffffff81759245 R08: ffffffff81759245 R09: ffffffff8dbcd480
R10: ffffc9000588f358 R11: ffffffff81ae4380 R12: 0000000000000002
R13: ffffffff8dbcd480 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
rcu_read_lock include/linux/rcupdate.h:850 [inline]
class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
unwind_next_frame+0xc2/0x23c0 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
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:2670 [inline]
slab_free mm/slub.c:6082 [inline]
kfree+0x1c1/0x690 mm/slub.c:6399
ieee80211_ibss_rx_queued_mgmt+0x1acf/0x2c80 net/mac80211/ibss.c:-1
ieee80211_iface_process_skb net/mac80211/iface.c:1740 [inline]
ieee80211_iface_work+0x85e/0x12b0 net/mac80211/iface.c:1794
cfg80211_wiphy_work+0x2ab/0x450 net/wireless/core.c:438
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
task:ktimers/1 state:R running task stack:25112 pid:29 tgid:29 ppid:2 task_flags:0x4208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x14de/0x5210 kernel/sched/core.c:6907
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234
irqentry_exit+0x599/0x620 kernel/entry/common.c:239
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x221/0x330 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 71 44 73 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 db a1 89 10 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 80 02 77 09 cc 48 8d 3d b8 33 ad
RSP: 0018:ffffc90000a3f740 EFLAGS: 00000282
RAX: 8b11ff414e427f00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000a2251b00 RSI: ffffffff8d5a1617 RDI: ffffffff8b861580
RBP: ffffffff88ad8dcc R08: ffffffff88ad8dcc R09: ffff888027cfea70
R10: dffffc0000000000 R11: fffffbfff1e9250f R12: 0000000000000000
R13: ffff888027cfea70 R14: 0000000000000001 R15: 0000000000000246
rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56
spin_lock include/linux/spinlock_rt.h:45 [inline]
class_spinlock_irqsave_constructor include/linux/spinlock.h:618 [inline]
snd_seq_prioq_cell_out+0x3c/0x3e0 sound/core/seq/seq_prioq.c:218
snd_seq_check_queue+0x337/0x580 sound/core/seq/seq_queue.c:264
snd_timer_process_callbacks sound/core/timer.c:785 [inline]
snd_timer_interrupt+0x10a8/0x1360 sound/core/timer.c:901
snd_hrtimer_callback+0x213/0x3a0 sound/core/hrtimer.c:51
__run_hrtimer kernel/time/hrtimer.c:1785 [inline]
__hrtimer_run_queues+0x553/0xd10 kernel/time/hrtimer.c:1849
hrtimer_run_softirq+0x192/0x5d0 kernel/time/hrtimer.c:1866
handle_softirqs+0x1de/0x640 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
run_ktimerd+0x69/0x100 kernel/softirq.c:1138
smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
task:kworker/u8:0 state:R running task stack:21728 pid:12 tgid:12 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound nsim_dev_trap_report_work
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x14de/0x5210 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule_rtlock+0x30/0x70 kernel/sched/core.c:7068
rtlock_slowlock_locked+0x3638/0x3c80 kernel/locking/rtmutex.c:1868
rtlock_slowlock kernel/locking/rtmutex.c:1895 [inline]
rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
__rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
rt_spin_lock+0x165/0x400 kernel/locking/spinlock_rt.c:57
spin_lock include/linux/spinlock_rt.h:45 [inline]
napi_skb_cache_get+0xbf/0x410 net/core/skbuff.c:288
__alloc_skb+0x1a7/0x390 net/core/skbuff.c:673
alloc_skb include/linux/skbuff.h:1383 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:818 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:875 [inline]
nsim_dev_trap_report_work+0x29f/0xbc0 drivers/net/netdevsim/dev.c:921
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 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 10502 jiffies! g9641 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:28248 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x14de/0x5210 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 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: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: 14 4c 02 e9 53 c2 03 00 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 53 32 17 00 fb f4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8d807dc0 EFLAGS: 00000242
RAX: 000000000009ff23 RBX: ffffffff819849cd RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8d34722c RDI: ffffffff8b861580
RBP: ffffffff8d807eb0 R08: ffff8880b8833cdb R09: 1ffff1101710679b
R10: dffffc0000000000 R11: ffffed101710679c R12: ffffffff8f492870
R13: 1ffffffff1b205d8 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888126595000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 000000000d9ba000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/kernel/process.c:766 [inline]
default_idle+0x9/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x1bd/0x500 kernel/sched/idle.c:332
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:430
rest_init+0x2de/0x300 init/main.c:757
start_kernel+0x380/0x3d0 init/main.c:1206
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