rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=f1cc/1/0x4000000000000000 softirq=14683/14684 fqs=5247
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   993582          0            0
rcu: 	cputime:    24867      27632           91   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=6021 q=2472 ncpus=2)
CPU: 0 UID: 0 PID: 6110 Comm: syz.1.68 Not tainted 6.16.0-rc6-syzkaller-00411-g95993dc3039e-dirty #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:rcu_read_unlock_special+0x87/0x4c0
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 62 2c f8 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900000075e0 EFLAGS: 00000206
RAX: 3874a917c0254800 RBX: 1ffff92000000ec4 RCX: 3874a917c0254800
RDX: 0000000000000000 RSI: ffffffff8d99883e RDI: ffffffff8be29f40
RBP: ffffc900000076d8 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007fc63184e6c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000005a00 CR3: 0000000107254000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 unwind_next_frame+0x19ae/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kmem_cache_free+0x18f/0x400
 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:get_futex_key+0x1290/0x1640
Code: 89 e6 e8 13 9b 0c 00 45 84 f6 74 0f e8 09 98 0c 00 4c 89 ef e8 91 15 47 00 eb 05 e8 fa 97 0c 00 49 bf 00 00 00 00 00 fc ff df <48> c7 84 24 80 00 00 00 0e 36 e0 45 48 8b 44 24 78 4a c7 04 38 00
RSP: 0018:ffffc90004467aa0 EFLAGS: 00000246
RAX: 00007fc630bb5000 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90007539000 RSI: 000000000000508b RDI: 000000000000508c
RBP: ffffc90004467bd0 R08: ffffc90004467c57 R09: 0000000000000000
R10: ffffc90004467c40 R11: fffff5200088cf8b R12: 0000000000000fac
R13: 00007fc630bb5fac R14: ffffc90004467c54 R15: dffffc0000000000
 futex_wake+0xf8/0x500
 do_futex+0x395/0x420
 __se_sys_futex+0x36f/0x400
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc63098e9a9
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:00007fc63184e0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fc630bb5fa8 RCX: 00007fc63098e9a9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fc630bb5fac
RBP: 00007fc630bb5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007fc630bb5fac
R13: 0000000000000000 R14: 00007ffdab704350 R15: 00007ffdab704438
 </TASK>
sched: DL replenish lagged too much
