rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=c814/1/0x4000000000000000 softirq=15343/15347 fqs=4844
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1024491          0            0
rcu: 	cputime:    25440      27048           88   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=8349 q=4196 ncpus=2)
CPU: 1 UID: 0 PID: 6229 Comm: syz.2.151 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:ffffc900001e01a0 EFLAGS: 00000206
RAX: c730e6a1d4c49700 RBX: 1ffff9200003c03c RCX: c730e6a1d4c49700
RDX: 0000000000000002 RSI: ffffffff8d99873a RDI: ffffffff8be29f80
RBP: ffffc900001e0298 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
FS:  00007f0941eab6c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000029c0 CR3: 000000010aeac000 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
 napi_alloc_skb+0x84/0x7d0
 e1000_clean_rx_irq+0x448/0x1170
 e1000_clean+0xca4/0x2b00
 __napi_poll+0xc7/0x480
 net_rx_action+0x707/0xe30
 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:ffffc9000465f458 EFLAGS: 00000282
RAX: c730e6a1d4c49700 RBX: 0000000000000000 RCX: c730e6a1d4c49700
RDX: 0000000000000006 RSI: ffffffff8d99873a RDI: ffffffff8be29f80
RBP: ffffc9000465f4b0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffff888105c0b980
R13: dffffc0000000000 R14: ffff888021f5b980 R15: ffff88813663ab98
 __schedule+0x16fd/0x4d00
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_reschedule_ipi+0x1a/0x20
RIP: 0010:kernfs_link_sibling+0x144/0x3e0
Code: c3 31 ff 89 c6 e8 2c 07 63 ff 85 db 0f 84 99 00 00 00 e8 df 02 63 ff 48 bb 00 00 00 00 00 fc ff df 48 8b 44 24 20 80 3c 18 00 <74> 08 48 89 ef e8 62 26 c6 ff 49 8d 4c 24 c0 48 8b 55 00 44 89 f7
RSP: 0018:ffffc9000465f848 EFLAGS: 00000246
RAX: 1ffff110232d300b RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc900210a2000 RSI: 0000000000002efb RDI: 0000000000002efc
RBP: ffff888119698058 R08: 0000000000000000 R09: ffffffff825cec7c
R10: dffffc0000000000 R11: ffffed1022258a25 R12: ffff8881199f14f0
R13: ffff888119698038 R14: 000000006e9a97f7 R15: ffff8881000cff00
 kernfs_add_one+0x1e0/0x520
 __kernfs_create_file+0x22b/0x2e0
 cgroup_addrm_files+0x7f2/0xb20
 css_populate_dir+0x124/0x3d0
 cgroup_apply_control_enable+0x58a/0xa80
 cgroup_mkdir+0xc40/0xe60
 kernfs_iop_mkdir+0x211/0x350
 vfs_mkdir+0x306/0x510
 do_mkdirat+0x247/0x590
 __x64_sys_mkdirat+0x87/0xa0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0940f8e9a9
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:00007f0941eab038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f09411b6080 RCX: 00007f0940f8e9a9
RDX: 00000000000001ff RSI: 0000200000000180 RDI: ffffffffffffff9c
RBP: 00007f0941010d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f09411b6080 R15: 00007ffcc57845e8
 </TASK>
sched: DL replenish lagged too much
