rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=e634/1/0x4000000000000000 softirq=16591/16592 fqs=5247
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   977305          0            0
rcu: 	cputime:    25373      27126           95   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=9953 q=2078 ncpus=2)
CPU: 1 UID: 0 PID: 6467 Comm: syz.2.189 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 d2 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:ffffc900001e04c0 EFLAGS: 00000206
RAX: b0a96e7dcae8da00 RBX: 1ffff9200003c0a0 RCX: b0a96e7dcae8da00
RDX: 0000000000000002 RSI: ffffffff8d998874 RDI: ffffffff8be29f40
RBP: ffffc900001e05b8 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
FS:  00007fba19b3e6c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2d13b0 CR3: 0000000022680000 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_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 kmalloc_reserve+0xbd/0x290
 __alloc_skb+0x142/0x2d0
 wg_packet_send_keepalive+0x65/0x2c0
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 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 1b 2d 21 f6 e8 56 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:ffffc90002b8eda0 EFLAGS: 00000286
RAX: b0a96e7dcae8da00 RBX: 0000000000000000 RCX: b0a96e7dcae8da00
RDX: 0000000000000006 RSI: ffffffff8d998874 RDI: 0000000000000001
RBP: ffffc90002b8ee50 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000571db4
 irqentry_exit+0x6f/0x90
 asm_common_interrupt+0x26/0x40
RIP: 0010:kernel_text_address+0x25/0xe0
Code: 90 90 90 90 90 66 0f 1f 00 55 41 56 53 48 81 ff 00 00 00 81 0f 93 c0 48 81 ff ac 4b 72 8b 0f 92 c1 bd 01 00 00 00 84 c8 75 0c <48> 89 fb e8 13 58 a6 ff 85 c0 74 0c 89 e8 5b 41 5e 5d c3 cc cc cc
RSP: 0018:ffffc90002b8ef18 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fba18d8e9a9 RCX: b0a96e7dcae8da01
RDX: 0000000000000004 RSI: ffffffff8db86591 RDI: 00007fba18d8e9a9
RBP: 0000000000000001 R08: ffffc90002b8ec4f R09: 0000000000000000
R10: ffffc90002b8ec40 R11: ffffffffa00008d0 R12: ffff8881076e9cc0
R13: ffff88801a441500 R14: dffffc0000000000 R15: 1ffff92000571df6
 __kernel_text_address+0xd/0x40
 unwind_get_return_address+0x4d/0x90
 arch_stack_walk+0xfc/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_node_track_caller_noprof+0x271/0x4e0
 kstrdup+0x42/0x100
 __kernfs_new_node+0x9c/0x7e0
 kernfs_new_node+0x102/0x210
 __kernfs_create_file+0x4b/0x2e0
 cgroup_addrm_files+0x7f2/0xb20
 css_populate_dir+0x124/0x3d0
 cgroup_apply_control_enable+0x58a/0xa80
 cgroup_apply_control+0x92/0x6e0
 cgroup_subtree_control_write+0xaa1/0x1090
 cgroup_file_write+0x39e/0x740
 kernfs_fop_write_iter+0x378/0x4f0
 vfs_write+0x54b/0xa90
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fba18d8e9a9
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:00007fba19b3e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fba18fb5fa0 RCX: 00007fba18d8e9a9
RDX: 0000000000000005 RSI: 0000200000000080 RDI: 0000000000000010
RBP: 00007fba18e10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fba18fb5fa0 R15: 00007ffc0e78deb8
 </TASK>
sched: DL replenish lagged too much
