rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10393 ticks this GP) idle=260c/1/0x4000000000000000 softirq=38853/38860 fqs=5234
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1150444          0            0
rcu: 	cputime:    33539      18950           39   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=32081 q=5007 ncpus=2)
CPU: 1 UID: 0 PID: 10818 Comm: syz.4.2087 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_read_unlock+0x6/0xe0
Code: c1 03 38 c1 7c dc 48 89 df e8 f6 09 7c 00 eb d2 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 <41> 56 41 55 41 54 53 49 bf 00 00 00 00 00 fc ff df 65 48 8b 3c 25
RSP: 0018:ffffc900001e0528 EFLAGS: 00000286
RAX: b13e649501022100 RBX: ffffffff90325d01 RCX: b13e649501022100
RDX: 0000000000000002 RSI: ffffffff8dba5cac RDI: ffffffff8be33300
RBP: dffffc0000000000 R08: ffffc900001e06f0 R09: 0000000000000000
R10: ffffc900001e06b8 R11: fffff5200003c0d9 R12: ffffc900001e0700
R13: ffffc900001d9000 R14: ffffc900001e0668 R15: ffffffff8172c195
FS:  00007faef02686c0(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31e0fff8 CR3: 000000001cbe0000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0x19ae/0x2390
 __unwind_start+0x5b9/0x760
 arch_stack_walk+0xe4/0x150
 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+0x172/0x4cc0
Code: 00 00 00 00 00 fc ff df 41 80 3c 07 00 74 08 48 89 df e8 b1 11 a9 f6 48 89 5c 24 58 4c 8b 33 49 8d 5e 20 48 89 d8 48 c1 e8 03 <48> b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 86 11
RSP: 0018:ffffc900034dfb60 EFLAGS: 00000a02
RAX: 1ffff11004632734 RBX: ffff8880231939a0 RCX: b13e649501022100
RDX: 0000000000000000 RSI: ffffffff8be332e0 RDI: ffffffff8be332a0
RBP: ffffc900034dfd70 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: ffff8881a3c1c000
R13: 0000000000000001 R14: ffff888023193980 R15: 1ffff11026cc7551
 preempt_schedule_notrace+0xd1/0x110
 preempt_schedule_notrace_thunk+0x16/0x30
 __bpf_trace_sys_enter+0x51/0x60
 trace_sys_enter+0xb0/0x100
 syscall_trace_enter+0xf9/0x160
 do_syscall_64+0xd3/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faeef38ebe9
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:00007faef0268038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007faeef5b5fa0 RCX: 00007faeef38ebe9
RDX: 0000000000000090 RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007faeef411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faeef5b6038 R14: 00007faeef5b5fa0 R15: 00007ffc82173fb8
 </TASK>
