rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10496 ticks this GP) idle=2c6c/1/0x4000000000000000 softirq=18867/21701 fqs=4635
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1205840       1299            0
rcu: 	cputime:    24990      27479           85   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=10873 q=3552 ncpus=2)
CPU: 0 UID: 0 PID: 7175 Comm: syz.1.389 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:__alloc_skb+0x14b/0x2d0
Code: 48 85 c0 0f 84 13 01 00 00 41 0f 18 0e 48 8d 7c 24 04 48 8d 4c 24 03 44 89 e6 89 ea e8 7e 08 00 00 48 85 c0 0f 84 f9 00 00 00 <49> 89 c4 44 8b 7c 24 04 42 0f 18 8c 38 c0 fe ff ff ba c8 00 00 00
RSP: 0018:ffffc900000079e8 EFLAGS: 00000286
RAX: ffff88803cf6aa00 RBX: 0000000000000000 RCX: ffff888106229cc0
RDX: 0000000000000100 RSI: ffffffff8be29f20 RDI: ffffffff8be29ee0
RBP: 00000000ffffffff R08: 00000000ffffffff R09: 0000000000000000
R10: ffff88803cf6aa00 R11: fffffbfff1f43d1f R12: 0000000000000820
R13: 0000000000000820 R14: ffff88810e8bd800 R15: ffff8881006c5b40
FS:  00007f29caff66c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000004 CR3: 0000000111dd2000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 ndisc_alloc_skb+0x9f/0x480
 ndisc_send_rs+0x2b5/0x630
 addrconf_rs_timer+0x369/0x670
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_irq_work+0xa3/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+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 1d 21 f6 e8 c6 f0 57 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:ffffc9000298f6a0 EFLAGS: 00000286
RAX: d0d8a4af7037fb00 RBX: 0000000000000000 RCX: d0d8a4af7037fb00
RDX: 0000000000000007 RSI: ffffffff8d99883e RDI: 0000000000000001
RBP: ffffc9000298f740 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000531ed4
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:strlen+0x1f/0x70
Code: 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 54 53 48 c7 c0 ff ff ff ff 49 be 00 00 00 00 00 fc ff df 48 89 fb <49> 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 11 48 ff c3
RSP: 0018:ffffc9000298f800 EFLAGS: 00000202
RAX: 0000000000000057 RBX: ffff88802ba80070 RCX: 0000000000080000
RDX: ffffc90003571000 RSI: 00000000000016c6 RDI: ffff88802ba80018
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff825cf83c
R10: dffffc0000000000 R11: ffffed10036df025 R12: ffff888107038870
R13: 0000000000000001 R14: dffffc0000000000 R15: 0000000000000056
 kernfs_name_hash+0x1d/0x1f0
 kernfs_find_ns+0xf3/0x320
 kernfs_iop_lookup+0x120/0x320
 __lookup_slow+0x297/0x3d0
 lookup_slow+0x53/0x70
 link_path_walk+0x935/0xea0
 __filename_parentat+0x246/0x670
 filename_create+0xcf/0x470
 do_mkdirat+0xa0/0x590
 __x64_sys_mkdir+0x6c/0x80
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f29cd18e9a9
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:00007f29caff6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f29cd3b5fa0 RCX: 00007f29cd18e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000000
RBP: 00007f29cd210d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f29cd3b5fa0 R15: 00007fff1f51ed08
 </TASK>
sched: DL replenish lagged too much
