rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=21cc/1/0x4000000000000000 softirq=20291/20292 fqs=5247
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   870128          0            0
rcu: 	cputime:    28344      24145          112   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=11605 q=13275 ncpus=2)
CPU: 0 UID: 0 PID: 6857 Comm: syz.3.371 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: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:ffffc900000077a0 EFLAGS: 00000206
RAX: c6279936f6d8e700 RBX: 1ffff92000000efc RCX: c6279936f6d8e700
RDX: 0000000000000002 RSI: ffffffff8d99883e RDI: ffffffff8be29f40
RBP: ffffc900000078a0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007fe1b14206c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe1b13ffd58 CR3: 0000000032dc2000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 ndisc_send_skb+0xd12/0x1400
 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 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:ffffc90002aff9a0 EFLAGS: 00000286
RAX: c6279936f6d8e700 RBX: 0000000000000000 RCX: c6279936f6d8e700
RDX: 0000000000000007 RSI: ffffffff8d99883e RDI: 0000000000000001
RBP: ffffc90002affa50 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200055ff34
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:qlist_free_all+0x75/0x140
Code: 49 01 c4 0f 1f 44 00 00 41 0f b6 44 24 33 c1 e0 18 3d 00 00 00 f5 4d 0f 45 e5 4d 8b 64 24 08 49 8b 2f 49 63 84 24 c0 00 00 00 <49> 29 c7 4c 89 e7 4c 89 fe e8 bd e3 ff ff 66 90 48 8d 15 00 00 00
RSP: 0018:ffffc90002affb10 EFLAGS: 00000246
RAX: 00000000000004e8 RBX: ffffc90002affb48 RCX: ffffea0004582500
RDX: ffffc9002408a000 RSI: 0000000000000875 RDI: 0000000000000876
RBP: ffff888116051608 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffff888100027640
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888116095a28
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_lru_noprof+0x1c6/0x3d0
 pidfs_alloc_inode+0x28/0x90
 alloc_inode+0x6a/0x1b0
 path_from_stashed+0x299/0x8f0
 pidfs_register_pid+0x108/0x1b0
 unix_socketpair+0xdc/0x6f0
 __sys_socketpair+0x2bb/0x560
 __x64_sys_socketpair+0x9b/0xb0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe1b058e9a9
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:00007fe1b1420038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007fe1b07b5fa0 RCX: 00007fe1b058e9a9
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: 00007fe1b0610d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000040 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe1b07b5fa0 R15: 00007ffec043d348
 </TASK>
sched: DL replenish lagged too much
