rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10497 ticks this GP) idle=3df4/1/0x4000000000000000 softirq=23611/23611 fqs=4766
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1203156          0            0
rcu: 	cputime:    25361      27128           76   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=15345 q=2850 ncpus=2)
CPU: 1 UID: 0 PID: 8103 Comm: syz.0.951 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:unwind_next_frame+0x5/0x2390
Code: e1 07 80 c1 03 38 c1 7c 92 48 89 df e8 d4 a1 b0 00 eb 88 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <41> 57 41 56 41 55 41 54 53 48 81 ec 98 00 00 00 49 89 fe 48 bd 00
RSP: 0018:ffffc900001e0798 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffc900001e0860 RCX: a4ee66b6f1026800
RDX: dffffc0000000000 RSI: ffffffff822344c6 RDI: ffffc900001e07a8
RBP: ffffc900001e0830 R08: ffffc900001e0870 R09: 0000000000000001
R10: dffffc0000000000 R11: ffffffff81ad0050 R12: ffff88810972b980
R13: 0000000000000000 R14: ffffffff81ad0050 R15: ffffc900001e07a8
FS:  00007f995bf646c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30d18ff8 CR3: 0000000031ef4000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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
 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_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 8b 2d 21 f6 e8 c6 00 58 f6 fb bf 01 00 00 00 <e8> 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000377f340 EFLAGS: 00000286
RAX: a4ee66b6f1026800 RBX: 0000000000000000 RCX: a4ee66b6f1026800
RDX: 0000000000000000 RSI: ffffffff8d99883e RDI: 0000000000000001
RBP: ffffc9000377f3e0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920006efe68
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__rcu_read_unlock+0x7f/0xe0
Code: 00 75 27 43 0f b6 04 3c 84 c0 75 41 8b 03 3d 00 00 00 40 73 0f 5b 41 5c 41 5d 41 5e 41 5f e9 c8 80 c9 09 cc 90 0f 0b 90 eb eb <e8> 6c 00 00 00 eb d2 89 d9 80 e1 07 80 c1 03 38 c1 7c a5 49 89 fe
RSP: 0018:ffffc9000377f4a8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88810972bdc4 RCX: a4ee66b6f1026800
RDX: 0000000000000000 RSI: ffffffff8db8655b RDI: ffff88810972b980
RBP: dffffc0000000000 R08: ffffc9000377f5f8 R09: 0000000000000000
R10: ffffc9000377f658 R11: fffff520006efecd R12: 1ffff110212e57b8
R13: ffffc90003778000 R14: ffff88810972bdc8 R15: dffffc0000000000
 unwind_next_frame+0x19ae/0x2390
 __unwind_start+0x5b9/0x760
 arch_stack_walk+0xe4/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 copy_signal+0x50/0x630
 copy_process+0x166e/0x3b80
 kernel_clone+0x21e/0x870
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f995b18e9a9
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:00007f995bf63fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f995b3b5fa0 RCX: 00007f995b18e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000011
RBP: 00007f995b210d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f995b3b5fa0 R15: 00007ffe65c43f88
 </TASK>
sched: DL replenish lagged too much
