rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4990/1:b..l..
rcu: (detected by 0, t=10502 jiffies, g=126333, q=1451 ncpus=1)
task:udevd state:R running task stack:24472 pid:4990 tgid:4990 ppid:1 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x125e/0x6990 kernel/sched/core.c:7382
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7662
irqentry_exit_cond_resched arch/x86/include/asm/fred.h:105 [inline]
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:453 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
irqentry_exit+0x33f/0xab0 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:debug_lockdep_rcu_enabled+0x0/0x40 kernel/rcu/update.c:319
Code: 00 00 8b 44 24 04 eb b2 89 44 24 04 e8 29 fa ff ff 8b 44 24 04 eb aa 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 8b 05 9e f4 7d 06 85 c0 74 20 8b 05 60 23 7e 06 85 c0
RSP: 0018:ffffc90003047510 EFLAGS: 00000287
RAX: ffffc90003048001 RBX: ffffc90003047810 RCX: ffffffff931e7601
RDX: ffffc90003047818 RSI: ffffc900030477e0 RDI: ffffc90003047598
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000007
R10: 0000000000000200 R11: 000000000001934f R12: ffffc900030475d8
R13: ffffc90003047588 R14: ffffc90003047810 R15: ffffc900030475bc
rcu_read_unlock include/linux/rcupdate.h:878 [inline]
class_rcu_destructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0x3a8/0x2090 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x162/0x1e0 mm/page_owner.c:183
__reset_page_owner+0x85/0x230 mm/page_owner.c:338
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1403 [inline]
__free_frozen_pages+0x7b4/0x1110 mm/page_alloc.c:2954
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
__kasan_kmalloc+0x8a/0xb0 mm/kasan/common.c:417
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5531 [inline]
__kmalloc_noprof+0x32f/0x840 mm/slub.c:5556
_kmalloc_noprof include/linux/slab.h:995 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
tomoyo_encode2+0xfb/0x3c0 security/tomoyo/realpath.c:45
tomoyo_encode+0x29/0x50 security/tomoyo/realpath.c:80
tomoyo_realpath_from_path+0x18c/0x690 security/tomoyo/realpath.c:283
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x276/0x460 security/tomoyo/file.c:827
security_inode_getattr+0x116/0x280 security/security.c:1917
vfs_getattr fs/stat.c:263 [inline]
vfs_statx_path fs/stat.c:303 [inline]
vfs_statx+0x11f/0x3f0 fs/stat.c:360
vfs_fstatat+0x77/0xe0 fs/stat.c:377
__do_sys_newfstatat+0x9d/0x120 fs/stat.c:542
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f928ad11b0a
RSP: 002b:00007fff43385a08 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 0000562447d58418 RCX: 00007f928ad11b0a
RDX: 00007fff43385a10 RSI: 0000562447d46ef3 RDI: 00000000ffffff9c
RBP: 0000562459ea8668 R08: 00065f0500fdbb8a R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff43385a10 R14: 0000000000000000 R15: 00065f0500fdbb8a
rcu: rcu_preempt kthread starved for 254 jiffies! g126333 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27496 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x125e/0x6990 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7474
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x930 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x179/0x260 kernel/rcu/tree.c:2330
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 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: 3228 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 10/15/2026
Workqueue: bat_events batadv_dat_purge
RIP: 0010:netif_rx_internal+0x3e/0x600 net/core/dev.c:5916
Code: 81 ec a8 00 00 00 48 c7 44 24 08 b3 8a b5 41 48 8d 5c 24 08 48 c7 44 24 10 40 78 89 8e 48 c1 eb 03 48 c7 44 24 18 d0 57 b7 89 <48> 01 d8 c7 00 f1 f1 f1 f1 c7 40 04 f1 f1 04 f2 c7 40 08 00 f2 f2
RSP: 0018:ffffc90000007608 EFLAGS: 00000a02
RAX: dffffc0000000000 RBX: 1ffff92000000ec2 RCX: 0000000000000302
RDX: ffff88803528cb00 RSI: ffffffff89b54aae RDI: ffff8881b4ba0b40
RBP: 0000000000000300 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff9269f55f R11: 000000000000777b R12: ffff8881b4ba0b40
R13: 0000000000000017 R14: ffff8880347b1a00 R15: 0000000000000048
FS: 0000000000000000(0000) GS:ffff88812248e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc8b144ff8 CR3: 0000000052ee8000 CR4: 00000000003526f0
Call Trace:
netif_rx+0x3d/0xb0 net/core/dev.c:5995
vxcan_xmit drivers/net/can/vxcan.c:90 [inline]
vxcan_xmit+0x493/0x8c0 drivers/net/can/vxcan.c:39
__netdev_start_xmit include/linux/netdevice.h:5455 [inline]
netdev_start_xmit include/linux/netdevice.h:5464 [inline]
xmit_one net/core/dev.c:4068 [inline]
dev_hard_start_xmit+0x121/0x760 net/core/dev.c:4084
__dev_queue_xmit+0x1bef/0x48d0 net/core/dev.c:5086
dev_queue_xmit include/linux/netdevice.h:3483 [inline]
can_send+0x5cd/0xbc0 net/can/af_can.c:279
can_can_gw_rcv net/can/gw.c:572 [inline]
can_can_gw_rcv+0x861/0xd10 net/can/gw.c:458
deliver net/can/af_can.c:575 [inline]
can_rcv_filter+0x153/0x890 net/can/af_can.c:602
can_receive+0x1a4/0x3b0 net/can/af_can.c:669
canfd_rcv+0x395/0x420 net/can/af_can.c:730
__netif_receive_skb_one_core+0x1b2/0x1e0 net/core/dev.c:6433
__netif_receive_skb+0x1f/0x120 net/core/dev.c:6546
process_backlog+0x487/0x1600 net/core/dev.c:6897
__napi_poll.constprop.0+0xaf/0x450 net/core/dev.c:7966
napi_poll net/core/dev.c:8029 [inline]
net_rx_action+0xa40/0xf20 net/core/dev.c:8186
handle_softirqs+0x216/0xa20 kernel/softirq.c:669
do_softirq kernel/softirq.c:569 [inline]
do_softirq+0xaf/0xf0 kernel/softirq.c:556
__local_bh_enable_ip+0xff/0x120 kernel/softirq.c:473
spin_unlock_bh include/linux/spinlock.h:407 [inline]
__batadv_dat_purge.part.0+0x294/0x3c0 net/batman-adv/distributed-arp-table.c:252
__batadv_dat_purge net/batman-adv/distributed-arp-table.c:233 [inline]
batadv_dat_purge+0x4b/0xa0 net/batman-adv/distributed-arp-table.c:271
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3495
process_scheduled_works kernel/workqueue.c:3578 [inline]
rescuer_thread+0x951/0x16e0 kernel/workqueue.c:3803
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245