rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10507 ticks this GP) idle=5174/1/0x4000000000000000 softirq=15996/15996 fqs=4702
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1129032          0            0
rcu: 	cputime:    30423      22066           79   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=9369 q=5780 ncpus=2)
CPU: 1 UID: 0 PID: 6709 Comm: syz.0.277 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:strlen+0x30/0x70
Code: 41 56 41 54 53 48 c7 c0 ff ff ff ff 49 be 00 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 <75> 11 48 ff c3 49 8d 47 01 42 80 7c 3f 01 00 75 de eb 19 89 d9 80
RSP: 0018:ffffc90000a07018 EFLAGS: 00000206
RAX: 0000000000000006 RBX: ffffffff8bce01ad RCX: 000000008bce0104
RDX: ffffffff81767e95 RSI: ffffffff8e75e5e0 RDI: ffffffff8bce01a0
RBP: ffffc90000a07140 R08: ffffc90000a08f28 R09: 0000000000000000
R10: ffffc90000a072d8 R11: fffff52000140e5d R12: dffffc0000000000
R13: ffffffff81767e95 R14: dffffc0000000000 R15: 000000000000000c
FS:  00007feff022e6c0(0000) GS:ffff8882a945a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feff01ebff8 CR3: 0000000176a0e000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 perf_trace_lock+0xd5/0x410
 lock_release+0x392/0x3d0
 unwind_next_frame+0x1aaa/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 __kfence_alloc+0x2ed/0x3e0
 kmem_cache_alloc_node_noprof+0x101/0x690
 __alloc_skb+0x1d0/0x7d0
 alloc_skb_with_frags+0xca/0x890
 sock_alloc_send_pskb+0x878/0x990
 __ip_append_data+0x2bc5/0x3f30
 ip_append_data+0x10d/0x190
 icmp_push_reply+0x86/0x400
 __icmp_send+0x118d/0x1590
 ipv4_link_failure+0x66c/0xa70
 vti_tunnel_xmit+0x10a4/0x1a00
 dev_hard_start_xmit+0x2d8/0x870
 __dev_queue_xmit+0x16d1/0x3890
 ip_finish_output2+0xca9/0x1070
 ip_output+0x29f/0x450
 __ip_queue_xmit+0x116a/0x1bb0
 __tcp_transmit_skb+0x2b30/0x43e0
 __tcp_retransmit_skb+0xaa1/0x1640
 tcp_retransmit_skb+0x33/0x440
 tcp_retransmit_timer+0x1ac7/0x35f0
 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:ffffc9000740f818 EFLAGS: 00000202
RAX: 00000000000002ad RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000007 RSI: ffffffff8def914b RDI: ffffffff8c27ca00
RBP: ffffc9000740f870 R08: ffffffff9011b4b7 R09: 1ffffffff2023696
R10: dffffc0000000000 R11: fffffbfff2023697 R12: ffff888173948000
R13: dffffc0000000000 R14: ffff888172fc57c0 R15: ffff88823c63b998
 __schedule+0x15e5/0x52d0
 preempt_schedule_notrace+0x57/0x90
 preempt_schedule_notrace_thunk+0x16/0x30
 perf_trace_lock+0x38b/0x410
 lock_release+0x392/0x3d0
 up_read+0x16/0x20
 lock_mm_and_find_vma+0x117/0x340
 do_user_addr_fault+0x330/0x1340
 exc_page_fault+0x6a/0xc0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:__put_user_4+0xd/0x20
Code: 66 89 01 31 c9 0f 1f 00 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 89 cb 48 c1 fb 3f 48 09 d9 0f 1f 00 <89> 01 31 c9 0f 1f 00 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000740fe50 EFLAGS: 00010246
RAX: 0000000000000006 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8e169f12 RDI: ffffffff8c27ca00
RBP: 0000000000000006 R08: ffffc9000740fc0f R09: 0000000000000000
R10: ffffc9000740fc00 R11: ffffffffa0000898 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000005
 __sys_socketpair+0xb7/0x560
 __x64_sys_socketpair+0x9b/0xb0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fefef39c819
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:00007feff022e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007fefef615fa0 RCX: 00007fefef39c819
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000001
RBP: 00007fefef432c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fefef616038 R14: 00007fefef615fa0 R15: 00007ffe1b914998
 </TASK>
sched: DL replenish lagged too much
