rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=5544/1/0x4000000000000000 softirq=68258/68259 fqs=5079
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1049922          0            0
rcu: 	cputime:    30474      22014           91   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=64893 q=2571 ncpus=2)
CPU: 1 UID: 0 PID: 18082 Comm: syz.3.3572 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:unwind_next_frame+0x374/0x2390
Code: ea 48 01 d2 48 01 f2 48 bd 00 00 00 00 00 fc ff df 0f 84 37 01 00 00 4c 8d 62 04 4c 8d 6a 05 4c 89 e0 48 c1 e8 03 0f b6 04 28 <84> c0 0f 85 6d 19 00 00 4c 89 e8 48 c1 e8 03 0f b6 04 28 84 c0 0f
RSP: 0018:ffffc900001e05d8 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: ffffffff8fba5524 RCX: ffffffff8fba5528
RDX: ffffffff9037c902 RSI: ffffffff9037c902 RDI: ffffffff8be33320
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff8172c195
R10: ffffc900001e06f8 R11: ffffffff81ac3c20 R12: ffffffff9037c906
R13: ffffffff9037c907 R14: ffffc900001e06a8 R15: ffffffff8fba5524
FS:  00007fa6368486c0(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c36e3fd CR3: 0000000108850000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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
 tcp_write_queue_purge+0x143/0x300
 tcp_done_with_error+0x43/0xd0
 tcp_write_timer_handler+0x6ec/0x9b0
 tcp_write_timer+0x162/0x2e0
 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:_raw_spin_unlock_irqrestore+0xa8/0x110
Code: 74 05 e8 3b 7a 4b f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 83 21 14 f6 65 8b 05 6c 61 24 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90007597aa0 EFLAGS: 00000206
RAX: a941506a7a591f00 RBX: 0000000000000a02 RCX: a941506a7a591f00
RDX: 0000000000000000 RSI: ffffffff8d9b6a61 RDI: 0000000000000001
RBP: ffffc90007597b28 R08: ffffffff8fa38137 R09: 1ffffffff1f47026
R10: dffffc0000000000 R11: fffffbfff1f47027 R12: dffffc0000000000
R13: 1ffff11026cc75be R14: ffff888107bde050 R15: 1ffff92000eb2f54
 try_to_wake_up+0x7b7/0x12b0
 wake_up_q+0x85/0xd0
 futex_wake+0x4a0/0x560
 do_futex+0x395/0x420
 __se_sys_futex+0x36f/0x400
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa63598ebe9
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:00007fa6368480e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fa635bb5fa8 RCX: 00007fa63598ebe9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fa635bb5fac
RBP: 00007fa635bb5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa635bb6038 R14: 00007ffce817c0c0 R15: 00007ffce817c1a8
 </TASK>
