rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=4c8c/1/0x4000000000000000 softirq=17537/17537 fqs=5250
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1027794          0            0
rcu: 	cputime:    24080      28409           86   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=9561 q=1335 ncpus=2)
CPU: 1 UID: 0 PID: 6932 Comm: syz.0.476 Not tainted 6.16.0-rc6-syzkaller-00434-gcd7c97f4584a #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_start+0x5d2/0x760
Code: 39 04 24 0f 87 1b fb ff ff 48 89 df e8 f7 d1 ff ff 48 be 00 00 00 00 00 fc ff df 48 8b 04 24 0f b6 04 30 84 c0 75 0e 83 3b 00 <0f> 85 4a ff ff ff e9 ef fa ff ff 89 d9 80 e1 07 80 c1 03 38 c1 7c
RSP: 0018:ffffc900001e0748 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc900001e07a8 RCX: f0571c948bd60500
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffffffff8be29f80
RBP: 1ffff9200003c0f6 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffc900001e07e0
R13: ffffc900001e07b8 R14: 1ffff9200003c0f7 R15: ffffc900001e07b0
FS:  00007fce7bbe96c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8614ce56c0 CR3: 000000003c5c8000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 arch_stack_walk+0xe4/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kfree+0x18e/0x440
 slab_free_after_rcu_debug+0x60/0x2a0
 rcu_core+0xca8/0x1710
 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:preempt_count_add+0xa7/0x1a0
Code: ff ff 7f 39 f8 75 43 48 8b 5c 24 18 48 89 df e8 8f e8 0d 00 85 c0 74 09 31 db 31 ff e8 82 e8 0d 00 65 4c 8b 34 25 08 10 a0 92 <49> 81 c6 e0 14 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c
RSP: 0018:ffffc9000665fdf8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff823c40c0 RCX: ffffffff99ab5200
RDX: ffff888028230000 RSI: 0000000000000000 RDI: ffffffff823c40c0
RBP: dffffc0000000000 R08: ffff888100aba820 R09: ffff888119ce1be8
R10: ffff888100aba820 R11: ffff888119ce1be8 R12: ffff88810e11f200
R13: 000000000000000b R14: ffff888028230000 R15: dffffc0000000000
 fd_install+0x90/0x540
 __sys_socketpair+0x49e/0x560
 __x64_sys_socketpair+0x9b/0xb0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fce7ad8e9a9
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:00007fce7bbe9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007fce7afb6080 RCX: 00007fce7ad8e9a9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: 00007fce7ae10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fce7afb6080 R15: 00007ffecacb6198
 </TASK>
sched: DL replenish lagged too much
