rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P15512/3:b..l P9/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=89901, q=97 ncpus=2)
task:kworker/0:0 state:R running task stack:19368 pid:9 tgid:9 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events_power_efficient neigh_periodic_work
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0x1498/0x5140 kernel/sched/core.c:6867
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7051
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
tasklet_action+0xc/0x70 kernel/softirq.c:952
handle_softirqs+0x1de/0x640 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
__local_bh_enable_ip+0x170/0x2b0 kernel/softirq.c:302
local_bh_enable include/linux/bottom_half.h:33 [inline]
spin_unlock_bh include/linux/spinlock_rt.h:111 [inline]
neigh_periodic_work+0xc37/0xe90 net/core/neighbour.c:1039
process_one_work kernel/workqueue.c:3257 [inline]
process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340
worker_thread+0xda6/0x1360 kernel/workqueue.c:3421
kthread+0x726/0x8b0 kernel/kthread.c:463
ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
task:syz.8.2416 state:R running task stack:25592 pid:15512 tgid:15500 ppid:12090 task_flags:0x40054c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0x1498/0x5140 kernel/sched/core.c:6867
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7194
irqentry_exit+0x597/0x620 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__rt_spin_lock kernel/locking/spinlock_rt.c:48 [inline]
RIP: 0010:rt_spin_lock+0xa3/0x400 kernel/locking/spinlock_rt.c:57
Code: 31 c9 ff 75 08 e8 fd d7 8b f6 48 83 c4 08 65 4c 8b 25 09 d4 13 07 4d 8d bc 24 84 04 00 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 28 <84> c0 0f 85 89 02 00 00 41 8b 17 c1 e2 08 48 c7 c7 40 16 2d 8b be
RSP: 0018:ffffc90016fe71c0 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: 1ffff92002dfce3c RCX: 0000000000000046
RDX: 000000003afbea00 RSI: ffffffff8d59cd30 RDI: ffffffff8b862b80
RBP: ffffc90016fe7280 R08: ffffffff822b127e R09: ffff88801aec58f0
R10: dffffc0000000000 R11: fffff9400031a8b9 R12: ffff888039bcbc00
R13: dffffc0000000000 R14: ffff88801aec5898 R15: ffff888039bcc084
spin_lock include/linux/spinlock_rt.h:44 [inline]
folio_lruvec_lock_irqsave+0x21e/0x3c0 mm/memcontrol.c:1256
folio_lruvec_relock_irqsave+0x26a/0x510 include/linux/memcontrol.h:1517
folio_batch_move_lru+0x1a3/0x340 mm/swap.c:171
__folio_batch_add_and_move+0x446/0xa90 mm/swap.c:196
folio_mark_accessed+0x36c/0x4a0 mm/swap.c:480
zap_present_folio_ptes mm/memory.c:1639 [inline]
zap_present_ptes mm/memory.c:1712 [inline]
do_zap_pte_range mm/memory.c:1814 [inline]
zap_pte_range mm/memory.c:1858 [inline]
zap_pmd_range mm/memory.c:1950 [inline]
zap_pud_range mm/memory.c:1978 [inline]
zap_p4d_range mm/memory.c:1999 [inline]
unmap_page_range+0x16b4/0x3cd0 mm/memory.c:2020
unmap_single_vma mm/memory.c:2062 [inline]
unmap_vmas+0x3c0/0x5c0 mm/memory.c:2104
exit_mmap+0x251/0xb30 mm/mmap.c:1277
__mmput+0xcb/0x3d0 kernel/fork.c:1173
exit_mm+0x168/0x220 kernel/exit.c:581
do_exit+0x62e/0x2320 kernel/exit.c:959
do_group_exit+0x21b/0x2d0 kernel/exit.c:1112
get_signal+0x125c/0x1310 kernel/signal.c:3034
arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x2b7/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f53e225af79
RSP: 002b:00007f53e048d0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f53e24d6098 RCX: 00007f53e225af79
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f53e24d6098
RBP: 00007f53e24d6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f53e24d6128 R14: 00007ffeb7560240 R15: 00007ffeb7560328
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g89901 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=61857
rcu: rcu_preempt kthread starved for 10502 jiffies! g89901 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27784 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0x1498/0x5140 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0x164/0x360 kernel/sched/core.c:6964
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+0x726/0x8b0 kernel/kthread.c:463
ret_from_fork+0x51b/0xa40 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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 15507 Comm: syz.7.2419 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:entry_SYSCALL_64_safe_stack+0x2/0xe
Code: fa 0f 01 f8 65 48 89 25 85 7f 25 11 66 90 0f 20 dc 0f 1f 44 00 00 48 81 e4 ff e7 ff ff 0f 22 dc 65 48 8b 25 65 ef 26 11 6a 2b <65> ff 35 60 7f 25 11 41 53 6a 33 51 50 57 56 52 51 6a da 41 50 41
RSP: 0018:ffffc90004c57fe8 EFLAGS: 00000006
RAX: 00000000000000ca RBX: 00007f1a7bdf5fa8 RCX: 00007f1a7bb7af79
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1a7bdf5fa8
RBP: 00007f1a7bdf5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1a7bdf6038 R14: 00007ffe4a3f3390 R15: 00007ffe4a3f3478
FS: 00007f1a79dce6c0(0000) GS:ffff8881266b1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3a7110 CR3: 0000000038156000 CR4: 00000000003526f0
Call Trace: