rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=9004/1/0x4000000000000000 softirq=29180/29180 fqs=5250
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1039109          0            0
rcu: 	cputime:    24129      28360           88   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=17785 q=792 ncpus=2)
CPU: 1 UID: 0 PID: 9547 Comm: syz.1.1495 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:handle_softirqs+0x1b0/0x870
Code: 89 64 24 30 0f b7 db 48 c7 c7 00 ad 89 8b e8 17 ef e8 09 65 66 c7 05 f5 5b 1a 11 00 00 e8 98 f5 41 00 fb 49 c7 c7 c0 c0 e0 8d <b8> ff ff ff ff 0f bc c3 41 89 c5 41 ff c5 0f 84 c2 03 00 00 89 5c
RSP: 0018:ffffc900001e0e40 EFLAGS: 00000286
RAX: 215fd45217183f00 RBX: 0000000000000200 RCX: 215fd45217183f00
RDX: 0000000000000002 RSI: ffffffff8d9986f9 RDI: ffffffff8be29f80
RBP: ffffc900001e0f50 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 000000000000000a
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffff8de0c0c0
FS:  00007fcd99e3c6c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001084ac000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __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:rcu_read_unlock_special+0x5a/0x4c0
Code: 00 00 00 fc ff df 48 c7 44 24 40 b3 8a b5 41 48 c7 44 24 48 6f 44 9d 8d 48 c7 44 24 50 20 d8 a7 81 48 8d 5c 24 40 48 c1 eb 03 <48> b8 f1 f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3
RSP: 0018:ffffc9000354f280 EFLAGS: 00000a02
RAX: 215fd45217183f00 RBX: 1ffff920006a9e58 RCX: 215fd45217183f00
RDX: 0000000000000003 RSI: ffffffff8db863da RDI: ffff888108da8000
RBP: ffffc9000354f380 R08: ffff88811029c363 R09: 1ffff1102205386c
R10: dffffc0000000000 R11: ffffed102205386d R12: 1ffff110211b5088
R13: dffffc0000000000 R14: ffff888108da8448 R15: dffffc0000000000
 __rcu_read_unlock+0x84/0xe0
 copy_pmd_range+0x67b9/0x7000
 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: 0033:0x7fcd98f8eb69
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:00007fcd99e3bfe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fcd991b5fa0 RCX: 00007fcd98f8eb69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000003000000
RBP: 00007fcd99011df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fcd991b5fa0 R15: 00007fff7639cac8
 </TASK>
sched: DL replenish lagged too much
