rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=a454/1/0x4000000000000000 softirq=30104/30104 fqs=5241
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1036540          0            0
rcu: 	cputime:    31877      20612           94   ==> 52500(ms)
rcu: 	(t=10501 jiffies g=20085 q=4443 ncpus=2)
CPU: 1 UID: 0 PID: 8081 Comm: syz.8.482 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:memcpy_orig+0x19/0x130
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 89 f8 48 83 fa 20 72 7e 40 38 fe 7c 35 48 83 ea 20 48 83 ea 20 4c 8b 06 <4c> 8b 4e 08 4c 8b 56 10 4c 8b 5e 18 48 8d 76 20 4c 89 07 4c 89 4f
RSP: 0018:ffffc900001e0c38 EFLAGS: 00000287
RAX: ffffc900001e0c80 RBX: 0000000000000101 RCX: ffffffff81ac1ab6
RDX: ffffffffffffffe8 RSI: ffff88810e23ee90 RDI: ffffc900001e0c80
RBP: ffffc900001e0d30 R08: ffffffff99ab5d40 R09: 1ffff9200003c194
R10: dffffc0000000000 R11: fffff5200003c195 R12: 1ffff9200003c18c
R13: ffff88810e23ee68 R14: 00000000ffffbf28 R15: ffffc900001e0c80
FS:  00007f7c5ce1d6c0(0000) GS:ffff8881a4173000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7c5cdfbfc8 CR3: 00000001164d4000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 call_timer_fn+0xa6/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 do_softirq+0xec/0x180
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x17d/0x1c0
 __inet_stream_connect+0x901/0xe70
 mptcp_sendmsg_fastopen+0x2a5/0x580
 mptcp_sendmsg+0x176c/0x1970
 __sock_sendmsg+0xe5/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7c5bf8ec29
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:00007f7c5ce1d038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f7c5c1d5fa0 RCX: 00007f7c5bf8ec29
RDX: e07e872420dfef8a RSI: 0000200000000b00 RDI: 0000000000000008
RBP: 00007f7c5c011e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7c5c1d6038 R14: 00007f7c5c1d5fa0 R15: 00007ffe64c7bac8
 </TASK>
sched: DL replenish lagged too much
