rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=5f74/1/0x4000000000000000 softirq=178036/178038 fqs=4692
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1067304          0            0
rcu: 	cputime:    35335      17154           86   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=145253 q=4198 ncpus=2)
CPU: 1 UID: 0 PID: 3580 Comm: syz.8.12309 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:_raw_spin_unlock_irqrestore+0x47/0x80
Code: f7 e8 1d c1 f0 f5 f7 c3 00 02 00 00 74 05 e8 d0 1a 1c f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> e4 7d e2 f5 65 8b 05 0d f0 6a 07 85 c0 74 18 5b 41 5e c3 cc cc
RSP: 0018:ffffc90000a08958 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000282 RCX: 0000000000000103
RDX: 0000000000000002 RSI: ffffffff8def914b RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff9011b4b7 R09: 1ffffffff2023696
R10: dffffc0000000000 R11: fffffbfff2023697 R12: ffff888174046be8
R13: ffff888174046a00 R14: ffffffff9a515d08 R15: 0000000000000001
FS:  00007f2ce9f7b6c0(0000) GS:ffff8882a945a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ef1eff8 CR3: 0000000114598000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 debug_check_no_obj_freed+0x52e/0x550
 kmem_cache_free+0x100/0x630
 tcp_write_queue_purge+0x143/0x360
 tcp_done_with_error+0x43/0xd0
 tcp_retransmit_timer+0x1f0e/0x35f0
 tcp_write_timer+0x15c/0x2d0
 call_timer_fn+0x192/0x640
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x22a/0x870
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:finish_task_switch+0x245/0x920
Code: 00 00 48 85 db 0f 85 e8 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 49 83 c4 48 4c 89 e7 e8 d5 65 1c 0a e8 30 81 38 00 fb 4c 8b 65 c0 <49> 8d bc 24 80 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc9000981fbb8 EFLAGS: 00000202
RAX: 000000000000ddcb RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8def914b RDI: ffffffff8c27ca00
RBP: ffffc9000981fc10 R08: ffffffff9011b4b7 R09: 1ffffffff2023696
R10: dffffc0000000000 R11: fffffbfff2023697 R12: ffff88816a5b0000
R13: dffffc0000000000 R14: ffff8881bae58000 R15: ffff88823c63b998
 __schedule+0x15e5/0x52d0
 preempt_schedule_common+0x82/0xd0
 preempt_schedule_thunk+0x16/0x30
 fput+0xb6/0xd0
 __se_sys_ioctl+0x168/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2ce919c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2ce9f7b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2ce9415fa0 RCX: 00007f2ce919c819
RDX: 0000000000000008 RSI: 0000000040042408 RDI: 0000000000000009
RBP: 00007f2ce9232c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2ce9416038 R14: 00007f2ce9415fa0 R15: 00007fffab8cf8b8
 </TASK>
clocksource: Long readout interval, skipping watchdog check: cs_nsec: 104685163282 wd_nsec: 104685165718
sched: DL replenish lagged too much
