rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=a4ec/1/0x4000000000000000 softirq=14339/14340 fqs=4484
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1019836          0            0
rcu: 	cputime:    24331      28157           85   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=6289 q=2810 ncpus=2)
CPU: 0 UID: 0 PID: 6189 Comm: syz.0.140 Not tainted 6.16.0-rc6-syzkaller-00434-gcd7c97f4584a-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 92 37 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: e0d7a735c74a9000 RBX: 1ffff92000000ec4 RCX: e0d7a735c74a9000
RDX: 0000000000000003 RSI: ffffffff8d998701 RDI: ffffffff8be29f80
RBP: ffffc900000076d8 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007f0a952436c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2f61086fc8 CR3: 0000000034990000 CR4: 00000000000006f0
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:finish_task_switch+0x26b/0x950
Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 3f 25 df 09 e8 ba b9 35 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90007386d78 EFLAGS: 00000286
RAX: e0d7a735c74a9000 RBX: 0000000000000000 RCX: e0d7a735c74a9000
RDX: 0000000000000007 RSI: ffffffff8d998701 RDI: ffffffff8be29f80
RBP: ffffc90007386dd0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffff88802208d640
R13: dffffc0000000000 R14: ffff88801c6d1cc0 R15: ffff88804b03ab98
 __schedule+0x16fd/0x4d00
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:put_cpu_partial+0x1b4/0x250
Code: 85 b5 00 00 00 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d e9 be 6c 58 09 cc e8 38 92 55 09 f7 c5 00 02 00 00 74 bc fb 4d 85 e4 <75> bb eb c4 90 e8 c2 04 a5 02 85 c0 74 22 83 3d 2b 23 89 0d 00 75
RSP: 0018:ffffc90007387170 EFLAGS: 00000286
RAX: e0d7a735c74a9000 RBX: ffff88801a441780 RCX: e0d7a735c74a9000
RDX: 0000000000000007 RSI: ffffffff8d998701 RDI: ffffffff8be29f80
RBP: 0000000000000282 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffea0000806100
R13: 0000000000000000 R14: ffff88802208d640 R15: ffff88804b03e510
 __slab_free+0x2f7/0x400
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 ptlock_alloc+0x20/0x70
 pte_alloc_one+0x7d/0x170
 __pte_alloc+0x25/0x1a0
 copy_pmd_range+0x68e6/0x7000
 copy_page_range+0xc46/0x1270
 dup_mmap+0xf57/0x1ac0
 copy_mm+0x13c/0x4b0
 copy_process+0x16d3/0x3b80
 kernel_clone+0x21e/0x870
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0a9438eb69
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:00007f0a95242fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f0a945b5fa0 RCX: 00007f0a9438eb69
RDX: 00002000000000c0 RSI: 0000200000000010 RDI: 0000000000000400
RBP: 00007f0a94411df1 R08: 00002000000001c0 R09: 00002000000001c0
R10: 0000200000000100 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f0a945b5fa0 R15: 00007ffef91b0798
 </TASK>
sched: DL replenish lagged too much
