rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...0: (1 ticks this GP) idle=e5a/1/0x4000000000000000 softirq=32249/32249 fqs=2553 
	(detected by 0, t=10502 jiffies, g=54717, q=41123)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3880 Comm: systemd-udevd Not tainted 5.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__kasan_check_read+0x4/0x10 mm/kasan/common.c:71
Code: 24 14 e9 e5 b4 ff ff 48 8b 73 58 89 c2 48 c7 c7 30 1d 69 89 f7 da e8 2a 5c aa ff e9 3b ef ff ff cc cc cc cc cc cc 48 8b 0c 24 <89> f6 31 d2 e9 73 2a 00 00 0f 1f 00 48 8b 0c 24 89 f6 ba 01 00 00
RSP: 0018:ffffc90000da8b18 EFLAGS: 00000003
RAX: 000000000000002a RBX: 0000000000000aab RCX: ffffffff8159b753
RDX: 1ffff11014c90d53 RSI: 0000000000000008 RDI: ffffffff8c58fb70
RBP: ffff8880a6486a78 R08: 0000000000000000 R09: ffffffff8c58fb77
R10: fffffbfff18b1f6e R11: 0000000000000000 R12: ffff8880a6486180
R13: 0000000000000040 R14: 2be249f3e05d1955 R15: 0000000000000001
FS:  00007f4cf64a98c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005621891e2d98 CR3: 00000000a7e47000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:56 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
 hlock_class kernel/locking/lockdep.c:179 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3127 [inline]
 validate_chain kernel/locking/lockdep.c:3183 [inline]
 __lock_acquire+0x16e3/0x56e0 kernel/locking/lockdep.c:4380
 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:587
RIP: 0010:qlink_to_object mm/kasan/quarantine.c:137 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:142 [inline]
RIP: 0010:qlist_free_all+0x32/0x140 mm/kasan/quarantine.c:167
Code: 55 53 48 8b 1f 48 85 db 0f 84 08 01 00 00 48 89 f5 49 89 fd 48 85 ed 49 89 ee 0f 84 8b 00 00 00 49 63 86 3c 01 00 00 4c 8b 23 <48> 29 c3 48 83 3d 5b cf 01 08 00 0f 84 e6 00 00 00 9c 58 0f 1f 44
RSP: 0018:ffffc90001077bd0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888093e16a80 RCX: ffffea00029fc487
RDX: 0000000000000000 RSI: ffffffff8134589a RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a15ed800
R13: ffffc90001077c08 R14: ffff88821b77e8c0 R15: 0000000000000286
 quarantine_reduce+0x17e/0x200 mm/kasan/quarantine.c:260
 __kasan_kmalloc.constprop.0+0x9e/0xd0 mm/kasan/common.c:475
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x12c/0x3b0 mm/slab.c:3484
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
 getname_flags fs/namei.c:2646 [inline]
 user_path_at_empty+0xa1/0x100 fs/namei.c:2646
 user_path_at include/linux/namei.h:59 [inline]
 vfs_statx+0x14e/0x390 fs/stat.c:202
 vfs_lstat include/linux/fs.h:3301 [inline]
 __do_sys_newlstat+0x91/0x110 fs/stat.c:374
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f4cf531c335
Code: Bad RIP value.
RSP: 002b:00007ffea0546ee8 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
RAX: ffffffffffffffda RBX: 00005621891aa880 RCX: 00007f4cf531c335
RDX: 00007ffea0546f20 RSI: 00007ffea0546f20 RDI: 00005621891a9880
RBP: 00007ffea0546fe0 R08: 00007f4cf55db1f8 R09: 0000000000001010
R10: 00007f4cf55dab58 R11: 0000000000000246 R12: 00005621891a9880
R13: 00005621891a9884 R14: 00005621891b9ec1 R15: 00005621891b9ec4