rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10510 ticks this GP) idle=6a1c/1/0x4000000000000000 softirq=15319/15322 fqs=4638
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   939089          0            0
rcu: 	cputime:    24247      28242          100   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=7697 q=1762 ncpus=2)
CPU: 0 UID: 0 PID: 6115 Comm: syz.1.77 Not tainted 6.16.0-rc6-syzkaller-00411-g95993dc3039e #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 62 2c 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:ffffc900000074e0 EFLAGS: 00000206
RAX: e214e8dcfa49cc00 RBX: 1ffff92000000ea4 RCX: e214e8dcfa49cc00
RDX: 0000000000000002 RSI: ffffffff8d998836 RDI: ffffffff8be29f40
RBP: ffffc900000075d8 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007fc14ab306c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc14ab30d58 CR3: 0000000022ec0000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 unwind_next_frame+0x19ae/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 skb_clone+0x212/0x3a0
 neigh_timer_handler+0xa3f/0x1030
 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 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:ffffc90004c7f380 EFLAGS: 00000282
RAX: e214e8dcfa49cc00 RBX: 0000000000000000 RCX: e214e8dcfa49cc00
RDX: 0000000000000007 RSI: ffffffff8d998836 RDI: 0000000000000001
RBP: ffffc90004c7f430 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200098fe70
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:put_cpu_partial+0x1b4/0x250
Code: 85 b5 00 00 00 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 68 87 55 09 f7 c5 00 02 00 00 74 bc fb 4d 85 e4 <75> bb eb c4 90 e8 d2 04 a5 02 85 c0 74 22 83 3d 5b 18 89 0d 00 75
RSP: 0018:ffffc90004c7f4f8 EFLAGS: 00000286
RAX: e214e8dcfa49cc00 RBX: ffff88801b68f640 RCX: e214e8dcfa49cc00
RDX: 0000000000000007 RSI: ffffffff8d998836 RDI: ffffffff8be29f40
RBP: 0000000000000282 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffea0000877200
R13: 0000000000000000 R14: ffff8880360f1cc0 R15: ffff88804b040960
 __slab_free+0x2f7/0x400
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_noprof+0x224/0x4f0
 sk_prot_alloc+0xe7/0x220
 sk_alloc+0x3a/0x370
 tun_chr_open+0x7a/0x510
 misc_open+0x2bc/0x330
 chrdev_open+0x4cc/0x5e0
 do_dentry_open+0xdf3/0x1970
 vfs_open+0x3b/0x340
 path_openat+0x2ee5/0x3830
 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: 0033:0x7fc149d8e9a9
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:00007fc14ab30038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fc149fb6080 RCX: 00007fc149d8e9a9
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: ffffffffffffff9c
RBP: 00007fc149e10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc149fb6080 R15: 00007ffe261b0088
 </TASK>
sched: DL replenish lagged too much
