rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (9772 ticks this GP) idle=7cc4/1/0x4000000000000000 softirq=15283/15283 fqs=4907
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   938185          0            0
rcu: 	cputime:    25875      26603          105   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=7505 q=3882 ncpus=2)
CPU: 1 UID: 0 PID: 5941 Comm: syz.1.17 Not tainted 6.16.0-rc6-syzkaller-00411-g95993dc3039e-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110
Code: 74 05 e8 cb 9e 56 f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 13 cd 1f f6 65 8b 05 bc f9 2e 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc900001e0b40 EFLAGS: 00000206
RAX: ef4bad0153118800 RBX: 0000000000000a02 RCX: ef4bad0153118800
RDX: 0000000000000000 RSI: ffffffff8d99883e RDI: 0000000000000001
RBP: ffffc900001e0bd0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: dffffc0000000000
R13: ffffffff81a8c254 R14: ffffffff99d27398 R15: 1ffff9200003c168
FS:  00007f306bc296c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010743c000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 rcu_core+0xc1e/0x1710
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 8b 2d 21 f6 e8 c6 00 58 f6 fb bf 01 00 00 00 <e8> 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000398fcc0 EFLAGS: 00000282
RAX: ef4bad0153118800 RBX: 0000000000000000 RCX: ef4bad0153118800
RDX: 0000000000000000 RSI: ffffffff8d99883e RDI: 0000000000000001
RBP: ffffc9000398fd70 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000731f98
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x8/0x90
Code: 48 89 44 11 20 c3 cc cc cc cc cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 08 10 a0 92 65 8b 15 48 e2 df 10 81 e2 00 01 ff 00
RSP: 0018:ffffc9000398fe30 EFLAGS: 00000246
RAX: ffffffff84f63dc6 RBX: ffff888117e4b320 RCX: 0000000000080000
RDX: ffffc90003fb1000 RSI: 0000000000000fe0 RDI: 0000000000000000
RBP: fffffffffffffff8 R08: ffff888117e4c2ff R09: 1ffff11022fc985f
R10: dffffc0000000000 R11: ffffed1022fc9860 R12: 0000000000000000
R13: 0000000000000fe0 R14: 0000000000000fe0 R15: 0000000000000000
 strncpy_from_user+0x1b6/0x290
 getname_flags+0xf3/0x540
 __x64_sys_mkdirat+0x7a/0xa0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f306ad8e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f306bc29038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f306afb5fa0 RCX: 00007f306ad8e9a9
RDX: 00000000000001ff RSI: 0000000000000000 RDI: ffffffffffffff9c
RBP: 00007f306ae10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f306afb5fa0 R15: 00007ffdb0f8c788
 </TASK>
sched: DL replenish lagged too much
