rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=a424/1/0x4000000000000000 softirq=19271/19271 fqs=4680
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1134542          0            0
rcu: 	cputime:    25761      26718           80   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=10693 q=2847 ncpus=2)
CPU: 0 UID: 0 PID: 6681 Comm: syz.4.295 Not tainted 6.16.0-rc6-syzkaller-00434-gcd7c97f4584a-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:rcu_read_unlock_special+0x87/0x4c0
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 92 37 f8 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc90000007320 EFLAGS: 00000206
RAX: 3fecf2176a341a00 RBX: 1ffff92000000e6c RCX: 3fecf2176a341a00
RDX: 0000000000000002 RSI: ffffffff8d998701 RDI: ffffffff8be29f80
RBP: ffffc90000007418 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007fe928b8b6c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f219ff8 CR3: 00000000389e4000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 unwind_next_frame+0x19ae/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 __kfence_alloc+0x2b2/0x3b0
 kmem_cache_alloc_node_noprof+0x315/0x3c0
 kmalloc_reserve+0xbd/0x290
 __alloc_skb+0x142/0x2d0
 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_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 5b 22 21 f6 e8 96 f5 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:ffffc90002daf7a0 EFLAGS: 00000286
RAX: 3fecf2176a341a00 RBX: 0000000000000000 RCX: 3fecf2176a341a00
RDX: 0000000000000000 RSI: ffffffff8d998701 RDI: 0000000000000001
RBP: ffffc90002daf840 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920005b5ef4
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:kmem_cache_alloc_noprof+0xaa/0x3c0
Code: 0f 85 78 01 00 00 cc 1f 44 00 00 48 c7 44 24 10 00 00 00 00 41 bc ff ff ff ff 65 48 8b 05 b6 c1 87 10 49 8b 0e 4c 8b 7c 08 08 <4c> 8b 2c 08 48 8b 5c 08 10 66 90 4d 85 ed 0f 84 86 01 00 00 48 85
RSP: 0018:ffffc90002daf900 EFLAGS: 00000246
RAX: ffff8880b861f000 RBX: 0000000000000000 RCX: ffffffff92a21a30
RDX: 0000000000000000 RSI: 0000000000000168 RDI: ffffffff8e260740
RBP: 0000000000000cc0 R08: 0000000000000000 R09: ffffffff8215f69d
R10: ffffc90002dafc20 R11: fffff520005b5f86 R12: 00000000ffffffff
R13: ffff88801f51c230 R14: ffff88801b68fa00 R15: 000000000004f230
 alloc_empty_file+0x55/0x1d0
 path_openat+0x107/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe927d8d310
Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 49 94 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 9c 94 02 00 8b 44
RSP: 002b:00007fe928b8af10 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fe927d8d310
RDX: 0000000000000002 RSI: 00007fe928b8afa0 RDI: 00000000ffffff9c
RBP: 00007fe928b8afa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe927fb5fa0 R15: 00007ffd167c5a78
 </TASK>
sched: DL replenish lagged too much
