sched: DL replenish lagged too much
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=6434/1/0x4000000000000000 softirq=16274/16277 fqs=1
rcu: 	(detected by 0, t=10506 jiffies, g=10877, q=399 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5955 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0x10/0xb0 kernel/rcu/tree.c:751
Code: 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 65 ff 05 30 85 a5 10 <e8> ab 4b 93 09 89 c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90000a08ce8 EFLAGS: 00000002
RAX: ffffffff81ac8283 RBX: ffff888079b77340 RCX: 0000000000010000
RDX: ffff88801dfe1e40 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000000000001 R08: ffffffff8f5c2237 R09: 1ffffffff1eb8446
R10: dffffc0000000000 R11: fffffbfff1eb8447 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff8880b8927bc0 R15: 0000000000000000
FS:  0000555589705500(0000) GS:ffff888126478000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555637d808 CR3: 000000007d104000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 trace_hrtimer_start include/trace/events/timer.h:222 [inline]
 debug_activate kernel/time/hrtimer.c:478 [inline]
 enqueue_hrtimer+0x9d/0x3a0 kernel/time/hrtimer.c:1081
 __run_hrtimer kernel/time/hrtimer.c:1794 [inline]
 __hrtimer_run_queues+0x656/0xc60 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:debug_lockdep_rcu_enabled+0xd/0x40 kernel/rcu/update.c:320
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 31 c0 83 3d b7 ee 23 04 00 <74> 1e 83 3d 9a 1d 24 04 00 74 15 65 48 8b 0c 25 08 80 4a 92 31 c0
RSP: 0018:ffffc90003ddf088 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88801dfe1e40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888074661be8 R08: ffffc900002ea6f7 R09: 1ffff9200005d4de
R10: dffffc0000000000 R11: fffff5200005d4df R12: dffffc0000000000
R13: ffffc90003ddf1c0 R14: 0000000000000000 R15: ffffffff823b9a96
 rcu_read_unlock include/linux/rcupdate.h:895 [inline]
 __d_lookup+0x629/0x780 fs/dcache.c:2413
 d_lookup+0x48/0xa0 fs/dcache.c:2339
 lookup_dcache fs/namei.c:1663 [inline]
 lookup_noperm+0xbb/0x220 fs/namei.c:3000
 simple_start_creating+0xfd/0x1e0 fs/libfs.c:2303
 debugfs_start_creating+0x10f/0x180 fs/debugfs/inode.c:397
 __debugfs_create_file+0x79/0x4f0 fs/debugfs/inode.c:432
 debugfs_create_file_short+0x3f/0x60 fs/debugfs/inode.c:480
 add_files net/mac80211/debugfs_netdev.c:942 [inline]
 ieee80211_debugfs_add_netdev net/mac80211/debugfs_netdev.c:1009 [inline]
 ieee80211_debugfs_recreate_netdev+0x29c/0x1460 net/mac80211/debugfs_netdev.c:1033
 ieee80211_if_change_type+0x156/0x990 net/mac80211/iface.c:2008
 ieee80211_change_iface+0xd5/0x510 net/mac80211/cfg.c:254
 rdev_change_virtual_intf net/wireless/rdev-ops.h:74 [inline]
 cfg80211_change_iface+0x792/0xef0 net/wireless/util.c:1238
 nl80211_set_interface+0x773/0xaa0 net/wireless/nl80211.c:4633
 genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 __sys_sendto+0x3bd/0x520 net/socket.c:2244
 __do_sys_sendto net/socket.c:2251 [inline]
 __se_sys_sendto net/socket.c:2247 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2247
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9c0ab90d5c
Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
RSP: 002b:00007f9c0af0fdf0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f9c0b914620 RCX: 00007f9c0ab90d5c
RDX: 0000000000000024 RSI: 00007f9c0b914670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007f9c0af0fe44 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f9c0b914670 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10500 jiffies! g10877 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=5775
rcu: rcu_preempt kthread starved for 10501 jiffies! g10877 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:26888 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7026
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>