rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5004/1:b..l..
rcu: (detected by 0, t=10502 jiffies, g=501165, q=899 ncpus=1)
task:udevd state:R running task stack:22408 pid:5004 tgid:5004 ppid:1 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7662
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
irqentry_exit+0x14f/0x9b0 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_release+0x2e1/0x3c0 kernel/locking/lockdep.c:5968
Code: 69 46 13 00 00 00 00 eb b5 e8 3b 98 74 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 43 22 46 13 48 3b 44 24 28 75 48 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d a8 86 1f
RSP: 0018:ffffc900035b7910 EFLAGS: 00000282
RAX: cffd2c047c28b300 RBX: 0000000000000206 RCX: 0000000000000046
RDX: ffffc900035b7a01 RSI: ffffffff8ea7ab24 RDI: ffffffff8c8ff980
RBP: ffff88807f6e8bb0 R08: ffffc900035b7a38 R09: 0000000000000000
R10: ffffc900035b7a98 R11: fffff520006b6f55 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff9015a420 R15: ffff88807f6e8000
rcu_lock_release include/linux/rcupdate.h:319 [inline]
rcu_read_unlock include/linux/rcupdate.h:880 [inline]
class_rcu_destructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0x1baa/0x2550 arch/x86/kernel/unwind_orc.c:709
__unwind_start+0x514/0x660 arch/x86/kernel/unwind_orc.c:787
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24
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
unpoison_slab_object mm/kasan/common.c:351 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:377
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4720 [inline]
slab_alloc_node mm/slub.c:5033 [inline]
kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5047
alloc_filename fs/namei.c:147 [inline]
do_getname+0x2e/0x250 fs/namei.c:187
getname_flags fs/namei.c:230 [inline]
getname include/linux/fs.h:2566 [inline]
class_filename_constructor include/linux/fs.h:2593 [inline]
__do_sys_unlink fs/namei.c:5771 [inline]
__se_sys_unlink+0x1e/0x140 fs/namei.c:5769
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7facfe715937
RSP: 002b:00007ffce0bbb788 EFLAGS: 00000202 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007facfe715937
RDX: 0000000000000000 RSI: 0000000052135a40 RDI: 0000563e1651002e
RBP: 0000000000000000 R08: 0000000052179ad5 R09: 3fffffffffffffff
R10: 4000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000563e1652b100 R14: 0000000000000001 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 235 jiffies! g501165 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:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x1230 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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: 3230 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 10/07/2026
Workqueue: bat_events batadv_tt_purge
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:221
Code: f7 e8 9d 14 89 f5 f7 c3 00 02 00 00 74 05 e8 e0 bc b5 f5 9c 58 a9 00 02 00 00 75 29 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 d4 08 7a f5 65 48 8b 05 ac c1 ce 08 48 85 c0 74 18 5b 41 5e c3
RSP: 0018:ffffc90000007b48 EFLAGS: 00000206
RAX: 0000000000000016 RBX: 0000000000000246 RCX: 8000000000000102
RDX: 0000000000000002 RSI: ffffffff8e7e9c25 RDI: 0000000000000001
RBP: ffffc90000007e48 R08: ffffffff91c0c6bf R09: 1ffffffff23818d7
R10: dffffc0000000000 R11: fffffbfff23818d8 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff88802a278000 R15: ffff88802b361410
FS: 0000000000000000(0000) GS:ffff888123376000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb8122a1fe0 CR3: 000000007f926000 CR4: 00000000003526f0
DR0: 0000000000000008 DR1: 0000000000000002 DR2: 0000000000000081
DR3: ffffffffefffff14 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
spin_unlock_irqrestore include/linux/spinlock.h:425 [inline]
dummy_timer+0x4967/0x4ce0 drivers/usb/gadget/udc/dummy_hcd.c:-1
__run_hrtimer kernel/time/hrtimer.c:2079 [inline]
__hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2136
hrtimer_run_softirq+0x1e3/0x2e0 kernel/time/hrtimer.c:2153
handle_softirqs+0x265/0x8d0 kernel/softirq.c:669
do_softirq+0x77/0xd0 kernel/softirq.c:569
__local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
spin_unlock_bh include/linux/spinlock.h:407 [inline]
batadv_tt_global_purge net/batman-adv/translation-table.c:2880 [inline]
batadv_tt_purge+0x4ee/0xa40 net/batman-adv/translation-table.c:4270
process_one_work kernel/workqueue.c:3495 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
rescuer_thread+0x84a/0x12a0 kernel/workqueue.c:3803
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245