rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8110/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=37281, q=1110 ncpus=1)
task:syz-executor state:R running task stack:24120 pid:8110 tgid:8110 ppid:8103 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7234
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7556
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x205/0xa00 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:unwind_next_frame+0x16ed/0x2090 arch/x86/kernel/unwind_orc.c:694
Code: 94 07 00 00 49 8b 45 10 48 39 dd 0f 87 f5 f8 ff ff 48 39 d8 0f 86 ec f8 ff ff 48 8d 53 08 48 39 d5 0f 92 c1 48 39 d0 0f 93 c0 <84> c1 0f 84 d4 f8 ff ff 48 39 5c 24 10 0f 82 c9 f8 ff ff 48 b8 00
RSP: 0018:ffffc90004786e38 EFLAGS: 00000216
RAX: ffffc90004788001 RBX: ffffc90004787a10 RCX: ffffffff92793401
RDX: ffffc90004787a18 RSI: ffffc900047879e0 RDI: ffffc90004786eb8
RBP: ffffc90004780000 R08: 0000000000000001 R09: 0000000000000007
R10: 0000000000000200 R11: 00000000000893a9 R12: ffffc90004786ef8
R13: ffffc90004786ea8 R14: ffffc90004787a10 R15: ffffc90004786edc
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
ref_tracker_alloc+0x1d4/0x590 lib/ref_tracker.c:276
__netdev_tracker_alloc include/linux/netdevice.h:4496 [inline]
netdev_hold include/linux/netdevice.h:4525 [inline]
netdev_hold include/linux/netdevice.h:4520 [inline]
rx_queue_add_kobject net/core/net-sysfs.c:1236 [inline]
net_rx_queue_update_kobjects+0x32e/0x760 net/core/net-sysfs.c:1301
register_queue_kobjects net/core/net-sysfs.c:2093 [inline]
netdev_register_kobject+0x2c6/0x410 net/core/net-sysfs.c:2344
register_netdevice+0x15b6/0x25a0 net/core/dev.c:11450
veth_newlink+0x316/0xa00 drivers/net/veth.c:1869
rtnl_newlink_create net/core/rtnetlink.c:3913 [inline]
__rtnl_newlink net/core/rtnetlink.c:4044 [inline]
rtnl_newlink+0x1499/0x2380 net/core/rtnetlink.c:4159
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:7076
netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2556
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1900
sock_sendmsg_nosec net/socket.c:775 [inline]
__sock_sendmsg net/socket.c:790 [inline]
__sys_sendto+0x48b/0x4e0 net/socket.c:2252
__do_sys_sendto net/socket.c:2259 [inline]
__se_sys_sendto net/socket.c:2255 [inline]
__x64_sys_sendto+0xe0/0x1c0 net/socket.c:2255
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2434f5e90e
RSP: 002b:00007ffd1dd849b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00005555736b4500 RCX: 00007f2434f5e90e
RDX: 0000000000000084 RSI: 00007f2435d54670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffd1dd84a34 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f2435d54670 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 227 jiffies! g37281 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:27880 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7326
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 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: 3215 Comm: kworker/R-bat_e Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 96 90 26 f6 48 89 df e8 1e e0 26 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 c5 ed 15 f6 65 8b 05 ee a6 c4 08 85 c0 74 16 5b
RSP: 0018:ffffc90000007c68 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff88802ab10000 RCX: 0000000000000004
RDX: 0000000000000000 RSI: ffffffff8e3aced0 RDI: ffffffff8c600380
RBP: 0000000000000246 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88819f549d10
R13: ffff88819f549d08 R14: ffff88802ac614a3 R15: ffff88802ac61410
FS: 0000000000000000(0000) GS:ffff888123bde000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3649a7731a CR3: 0000000032a5f000 CR4: 00000000003526f0
Call Trace:
spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
dummy_timer+0x1d91/0x36f0 drivers/usb/gadget/udc/dummy_hcd.c:2036
__run_hrtimer kernel/time/hrtimer.c:2032 [inline]
__hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2096
hrtimer_run_softirq+0x17d/0x2c0 kernel/time/hrtimer.c:2113
handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622
do_softirq kernel/softirq.c:523 [inline]
do_softirq+0xac/0xe0 kernel/softirq.c:510
__local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:450
spin_unlock_bh include/linux/spinlock.h:396 [inline]
batadv_forw_packet_queue+0x238/0x2f0 net/batman-adv/send.c:680
batadv_iv_ogm_aggregate_new+0x3cd/0x4b0 net/batman-adv/bat_iv_ogm.c:610
batadv_iv_ogm_queue_add net/batman-adv/bat_iv_ogm.c:698 [inline]
batadv_iv_ogm_schedule_buff+0x95d/0x15e0 net/batman-adv/bat_iv_ogm.c:870
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:918 [inline]
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:911 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x548/0x800 net/batman-adv/bat_iv_ogm.c:1807
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
rescuer_thread+0x905/0x14a0 kernel/workqueue.c:3629
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245