rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P76/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=13701, q=315 ncpus=2)
task:kworker/u8:5 state:R running task stack:23768 pid:76 tgid:76 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound linkwatch_event
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6863
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190
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:unwind_next_frame+0x484/0x23d0 arch/x86/kernel/unwind_orc.c:520
Code: d2 84 c0 48 0f 45 d1 48 89 15 98 ae 10 11 48 85 d2 0f 84 40 02 00 00 4c 8d 62 04 4c 8d 6a 05 4c 89 e0 48 c1 e8 03 0f b6 04 28 <84> c0 0f 85 6d 18 00 00 4c 89 e8 48 c1 e8 03 0f b6 04 28 84 c0 0f
RSP: 0018:ffffc9000217f198 EFLAGS: 00000212
RAX: 0000000000000000 RBX: ffffffff8fa25580 RCX: ffffffff8fa25584
RDX: ffffffff9021eeae RSI: ffffffff9021eeae RDI: ffffffff8bc08300
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff8df41a20
R10: dffffc0000000000 R11: ffffffff81ada120 R12: ffffffff9021eeb2
R13: ffffffff9021eeb3 R14: ffffc9000217f268 R15: ffffffff8fa25580
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6668 [inline]
kmem_cache_free+0x197/0x620 mm/slub.c:6779
netlink_broadcast_filtered+0xec7/0x1000 net/netlink/af_netlink.c:1535
nlmsg_multicast_filtered include/net/netlink.h:1165 [inline]
nlmsg_multicast include/net/netlink.h:1184 [inline]
nlmsg_notify+0xf0/0x1a0 net/netlink/af_netlink.c:2593
netif_state_change+0x289/0x380 net/core/dev.c:1586
linkwatch_do_dev+0x117/0x170 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 kernel/workqueue.c:3257 [inline]
process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
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 10553 jiffies! g13701 f0x0 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:27200 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6122 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__set_current_blocked kernel/signal.c:3222 [inline]
RIP: 0010:set_current_blocked kernel/signal.c:3206 [inline]
RIP: 0010:signal_delivered kernel/signal.c:3070 [inline]
RIP: 0010:signal_setup_done+0x215/0x3b0 kernel/signal.c:3082
Code: 23 00 74 08 4c 89 ff e8 f9 e8 9f 00 49 8b be 68 09 00 00 e8 2d 27 d6 09 48 8d 74 24 08 4c 89 f7 e8 30 11 00 00 42 80 3c 23 00 <74> 08 4c 89 ff e8 d1 e8 9f 00 49 8b 3f e8 e9 29 d6 09 4d 8d be b0
RSP: 0018:ffffc900036c7d10 EFLAGS: 00000046
RAX: ffffffff81874901 RBX: 1ffff110060898cd RCX: ffffffff8187494c
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88803044bd00
RBP: 0000000000000000 R08: ffff88803044bd07 R09: 1ffff110060897a0
R10: dffffc0000000000 R11: ffffed10060897a1 R12: dffffc0000000000
R13: 0000000000010000 R14: ffff88803044bd00 R15: ffff88803044c668
FS: 000055556cdc1500(0000) GS:ffff888125f35000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe2f29bec4 CR3: 000000006be6d000 CR4: 0000000000350ef0
Call Trace:
handle_signal arch/x86/kernel/signal.c:312 [inline]
arch_do_signal_or_restart+0x465/0x7a0 arch/x86/kernel/signal.c:339
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop+0x87/0x4f0 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+0x2d0/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f057464d6e0
Code: 44 24 20 0f 29 44 24 30 0f 29 44 24 40 48 8b 44 24 08 ff d0 48 83 c4 50 31 c0 5b 5d 41 5c 41 5d 41 5e c3 0f 1f 80 00 00 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 c3 66 66 2e 0f 1f
RSP: 002b:00007ffdac744038 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f05749e5fa8 RCX: 00007f057478f749
RDX: 00007ffdac744040 RSI: 00007ffdac744170 RDI: 0000000000000011
RBP: 0000000000000000 R08: 3fffffffffffffff R09: 00000009ac7448df
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f05749e5fac
R13: 00007f05749e5fa0 R14: 0000000000001da6 R15: 0000000000000004