rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-....: (2 ticks this GP) idle=f42/1/0x4000000000000000 softirq=42020/42020 fqs=9 
	(detected by 0, t=10502 jiffies, g=77249, q=726)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3878 Comm: systemd-udevd Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4059 [inline]
RIP: 0010:__lock_acquire+0x4d1/0x56e0 kernel/locking/lockdep.c:4330
Code: 0f 83 3d 0c 00 00 4d 69 ff b8 00 00 00 49 81 c7 40 fe 58 8c 48 b8 00 00 00 00 00 fc ff df 48 8b 14 24 48 c1 ea 03 0f b6 04 02 <84> c0 74 08 3c 03 0f 8e c9 0f 00 00 41 8b 94 24 c8 08 00 00 85 d2
RSP: 0018:ffffc90000da8b20 EFLAGS: 00000806
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff8159a50f
RDX: 1ffff11014c6d9c9 RSI: 0000000000000008 RDI: ffffffff8c58fb90
RBP: ffff8880a636cea0 R08: 0000000000000000 R09: ffffffff8c58fb97
R10: fffffbfff18b1f72 R11: 0000000000000001 R12: ffff8880a636c580
R13: 0000000000000002 R14: ffff8880a8cebb00 R15: ffffffff8c614f30
FS:  00007f79e15628c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a1de3ebe78 CR3: 00000000a78e4000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:4959
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:353 [inline]
 advance_sched+0x4f/0x990 net/sched/sch_taprio.c:699
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x6a9/0xfc0 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_apic_timer_interrupt+0xe0/0x120 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:765 [inline]
RIP: 0010:lock_acquire+0x270/0xad0 kernel/locking/lockdep.c:4962
Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 f8 06 00 00 48 83 3d 6d d0 5a 08 00 0f 84 a6 05 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 10 48 c7
RSP: 0018:ffffc90001677848 EFLAGS: 00000282
RAX: 1ffffffff1369c08 RBX: ffff8880a636c580 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000282
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c58fa2f
R10: fffffbfff18b1f45 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88821813d0a0 R14: 0000000000000000 R15: ffff8880a61ca8a8
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:353 [inline]
 lockref_get_not_dead+0x14/0x80 lib/lockref.c:211
 __legitimize_path+0x7f/0x1c0 fs/namei.c:617
 legitimize_path fs/namei.c:627 [inline]
 legitimize_root+0x102/0x160 fs/namei.c:657
 unlazy_walk+0x127/0x3a0 fs/namei.c:693
 may_lookup fs/namei.c:1572 [inline]
 link_path_walk.part.0+0x769/0xc20 fs/namei.c:2125
 link_path_walk fs/namei.c:2112 [inline]
 path_openat+0x25a/0x2750 fs/namei.c:3356
 do_filp_open+0x17e/0x3c0 fs/namei.c:3387
 do_sys_openat2+0x16f/0x3b0 fs/open.c:1179
 do_sys_open fs/open.c:1195 [inline]
 ksys_open include/linux/syscalls.h:1388 [inline]
 __do_sys_open fs/open.c:1201 [inline]
 __se_sys_open fs/open.c:1199 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1199
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f79e03d56f0
Code: Bad RIP value.
RSP: 002b:00007fff71db5cd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000055a1de3e5340 RCX: 00007f79e03d56f0
RDX: 00000000000001b6 RSI: 0000000000080000 RDI: 00007fff71db5e80
RBP: 0000000000000008 R08: 0000000000000008 R09: 0000000000000001
R10: 0000000000080000 R11: 0000000000000246 R12: 000055a1dd74568a
R13: 0000000000000001 R14: 000055a1de3e6410 R15: 00007fff71db5f00
rcu: rcu_preempt kthread starved for 5116 jiffies! g77249 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:
rcu_preempt     R  running task    29552    10      2 0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3453 [inline]
 __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
 schedule+0xd0/0x2a0 kernel/sched/core.c:4253
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1897
 rcu_gp_fqs_loop kernel/rcu/tree.c:1874 [inline]
 rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2044
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293