rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10448 ticks this GP) idle=31c4/1/0x4000000000000000 softirq=24090/24114 fqs=5228
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1178454          0            0
rcu: 	cputime:    31177      21302           39   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=16305 q=5156 ncpus=2)
CPU: 1 UID: 0 PID: 7485 Comm: syz.4.388 Not tainted syzkaller #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_is_watching+0x55/0xb0
Code: 2d be 8d 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 3c 74 7d 00 48 c7 c3 98 1f a2 92 49 03 1e 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 34 8b 03 65 ff 0d 99 79 fa 10 74 11 83 e0
RSP: 0018:ffffc900001e0578 EFLAGS: 00000a06
RAX: 1ffff11026cc65f3 RBX: ffff888136632f98 RCX: 34dcefe3e78ab100
RDX: ffffc900001e0601 RSI: ffffffff8be34460 RDI: ffffffff8be34420
RBP: dffffc0000000000 R08: ffffc900001e07a0 R09: 0000000000000000
R10: ffffc900001e06b8 R11: fffff5200003c0d9 R12: ffffc900001e07b0
R13: ffffc900001d9000 R14: ffffffff8dbe2d18 R15: dffffc0000000000
FS:  00007fc21ea1b6c0(0000) GS:ffff8881a3c11000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000029906000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0x1965/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kmem_cache_free+0x18f/0x400
 inet_frag_destroy+0x17b/0x2a0
 ip_expire+0x5b5/0x8f0
 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:__schedule+0x7f/0x4cc0
Code: 16 3d a7 8d 48 c7 84 24 10 01 00 00 b0 ee 7b 8b 48 8d 8c 24 00 01 00 00 48 c1 e9 03 48 b8 f1 f1 f1 f1 04 f2 00 00 4a 89 04 31 <48> b8 f2 f2 f2 f2 f2 00 f2 f2 4a 89 44 31 09 42 c7 44 31 11 f2 00
RSP: 0018:ffffc900041af840 EFLAGS: 00000a06
RAX: 0000f204f1f1f1f1 RBX: 0000000000000000 RCX: 1ffff92000835f28
RDX: 0000000000000007 RSI: ffffffff8d9baf27 RDI: ffffc900041af9d0
RBP: ffffc900041afa50 R08: ffffffff8fa3b537 R09: 1ffffffff1f476a6
R10: dffffc0000000000 R11: fffffbfff1f476a7 R12: 0000000000000000
R13: 0000000000000001 R14: dffffc0000000000 R15: 1ffff92000835f4c
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__slab_free+0x3e/0x3c0
Code: 89 fe 65 48 8b 05 d2 50 87 10 48 89 44 24 48 44 89 44 24 04 48 89 4c 24 18 0f 1f 44 00 00 31 ed 49 bf 00 00 00 00 ff ff ff ff <45> 31 c9 31 ff 48 85 ed 0f 84 e8 00 00 00 e9 b6 00 00 00 4c 89 74
RSP: 0018:ffffc900041afbc8 EFLAGS: 00000246
RAX: 34dcefe3e78ab100 RBX: ffffc900041afc88 RCX: ffff8881060e6800
RDX: ffff8881060e6800 RSI: ffffea0004183980 RDI: ffff888100014a00
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8223fd9c
R10: dffffc0000000000 R11: fffffbfff1f476a7 R12: ffff888100014a00
R13: 0000000000000000 R14: ffff888100014a00 R15: ffffffff00000000
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 alloc_empty_file+0x55/0x1d0
 alloc_file_pseudo+0x13d/0x210
 sock_alloc_file+0xb8/0x2e0
 __sys_socket+0x13d/0x1b0
 __x64_sys_socket+0x7a/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc21db8ec29
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:00007fc21ea1b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007fc21ddd5fa0 RCX: 00007fc21db8ec29
RDX: 000000000000000c RSI: 0000000000000003 RDI: 0000000000000010
RBP: 00007fc21dc11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc21ddd6038 R14: 00007fc21ddd5fa0 R15: 00007ffe23d37ac8
 </TASK>
sched: DL replenish lagged too much
