rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1):
	(detected by 1, t=10502 jiffies, g=63021, q=26)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294995884-4294985382), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g63021 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=19865
rcu: rcu_preempt kthread starved for 10502 jiffies! g63021 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:29392 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4688 [inline]
 __schedule+0xb38/0x58c0 kernel/sched/core.c:5945
 schedule+0xcf/0x270 kernel/sched/core.c:6024
 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1878
 rcu_gp_fqs_loop kernel/rcu/tree.c:1996 [inline]
 rcu_gp_kthread+0xd21/0x1960 kernel/rcu/tree.c:2169
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8469 Comm: syz-executor.2 Not tainted 5.13.0-rc2-next-20210518-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:match_held_lock+0x0/0x150 kernel/locking/lockdep.c:4961
Code: cc cc cc cc cc cc cc cc cc cc 80 3d 63 05 b8 04 00 74 01 c3 48 c7 c7 20 b2 8b 89 c6 05 52 05 b8 04 01 e8 1e 62 be ff 0f 0b c3 <48> 39 77 10 0f 84 97 00 00 00 66 f7 47 22 f0 ff 74 4b 48 83 ec 08
RSP: 0018:ffffc90000007be0 EFLAGS: 00000093
RAX: 0000000000000005 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8c17af20 RDI: ffff888018ed26d0
RBP: ffffffff8c17af20 R08: 0000000000000000 R09: ffffffff8de9c4d7
R10: fffffbfff1bd389a R11: 0000000000000000 R12: ffff888018ed1c80
R13: ffff888018ed26a8 R14: 00000000ffffffff R15: ffff888018ed26d0
FS:  000000000238d400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7d8ae7bbb8 CR3: 000000007432a000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __lock_is_held kernel/locking/lockdep.c:5255 [inline]
 lock_is_held_type+0xa7/0x140 kernel/locking/lockdep.c:5555
 lock_is_held include/linux/lockdep.h:283 [inline]
 rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125
 trace_lock_release include/trace/events/lock.h:58 [inline]
 lock_release+0x522/0x720 kernel/locking/lockdep.c:5523
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:158 [inline]
 _raw_spin_unlock_irqrestore+0x16/0x70 kernel/locking/spinlock.c:191
 debug_object_activate+0x287/0x3e0 lib/debugobjects.c:684
 debug_hrtimer_activate kernel/time/hrtimer.c:420 [inline]
 debug_activate kernel/time/hrtimer.c:475 [inline]
 enqueue_hrtimer+0x27/0x3e0 kernel/time/hrtimer.c:982
 __run_hrtimer kernel/time/hrtimer.c:1554 [inline]
 __hrtimer_run_queues+0xb02/0xe50 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647
RIP: 0010:finish_task_switch.isra.0+0x31e/0xb80 kernel/sched/core.c:4562
Code: f8 ca cd 07 85 c0 75 02 0f 0b 48 85 db 0f 85 26 01 00 00 4c 89 f7 e8 21 f8 ff ff e8 bc 53 2c 00 fb 65 48 8b 1c 25 00 f0 01 00 <48> 8d bb 48 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc900016cf758 EFLAGS: 00000206
RAX: 000000000044e42b RBX: ffff888018ed1c80 RCX: 1ffffffff208f582
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900016cf7a0 R08: 0000000000000001 R09: ffffffff904409ff
R10: 0000000000000001 R11: 0000000000000001 R12: ffff8880b9c36438
R13: ffff8880828fd580 R14: ffff8880b9c35700 R15: ffff8880b9c36138
 context_switch kernel/sched/core.c:4691 [inline]
 __schedule+0xb40/0x58c0 kernel/sched/core.c:5945
 preempt_schedule_notrace+0x5b/0xd0 kernel/sched/core.c:6184
 preempt_schedule_notrace_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:36
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x572/0x740 kernel/locking/lockdep.c:5483
 rcu_lock_acquire include/linux/rcupdate.h:267 [inline]
 rcu_read_lock include/linux/rcupdate.h:687 [inline]
 ext4_get_group_desc+0x146/0x500 fs/ext4/balloc.c:284
 recently_deleted fs/ext4/ialloc.c:682 [inline]
 find_inode_bit+0x1c4/0x580 fs/ext4/ialloc.c:728
 __ext4_new_inode+0xc4d/0x5620 fs/ext4/ialloc.c:1063
 ext4_mkdir+0x33a/0xb20 fs/ext4/namei.c:2919
 vfs_mkdir+0x52e/0x760 fs/namei.c:3813
 do_mkdirat+0x284/0x310 fs/namei.c:3838
 do_syscall_64+0x31/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4656e7
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffefdbd8158 EFLAGS: 00000202 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007ffefdbd81f0 RCX: 00000000004656e7
RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007ffefdbd81f0
RBP: 00007ffefdbd81cc R08: 0000000000000000 R09: 0000000000000005
R10: 00007ffefdbd7ef5 R11: 0000000000000202 R12: 0000000000000032
R13: 0000000000075adf R14: 0000000000000002 R15: 00007ffefdbd8230