rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=17dc/1/0x4000000000000000 softirq=16151/16152 fqs=4166
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1499820          0            0
rcu: 	cputime:    15810      36679           31   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=11989 q=2222 ncpus=2)
CPU: 1 UID: 0 PID: 6679 Comm: syz.0.250 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:kcov_remote_stop+0x29/0x6d0 kernel/kcov.c:1068
Code: 90 f3 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 38 65 4c 8b 34 25 08 90 8f 92 65 8b 05 4e 59 d0 10 a9 00 00 ff 00 74 14 <48> 83 c4 38 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 c7
RSP: 0000:ffffc90000a08990 EFLAGS: 00000206
RAX: b973bb43ad242700 RBX: 0000000000000246 RCX: b973bb43ad242700
RDX: 0000000000000000 RSI: ffffffff8d7e36cd RDI: ffffffff8bc060e0
RBP: ffffc90000a08c10 R08: ffffffff8f9db437 R09: 1ffffffff1f3b686
R10: dffffc0000000000 R11: fffffbfff1f3b687 R12: ffffffff81bf3738
R13: ffff888076ceea00 R14: ffff888026838000 R15: ffff8880b8728748
FS:  00007f6ba34656c0(0000) GS:ffff888125e27000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2dd503 CR3: 00000000301f4000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 ieee80211_rx_list+0x2282/0x2b40 net/mac80211/rx.c:5450
 ieee80211_rx_napi+0x1a8/0x3d0 net/mac80211/rx.c:5470
 ieee80211_rx include/net/mac80211.h:5214 [inline]
 ieee80211_handle_queued_frames+0xe8/0x1f0 net/mac80211/main.c:453
 tasklet_action_common+0x369/0x580 kernel/softirq.c:925
 handle_softirqs+0x283/0x870 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 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:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7256
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 10 00 00 00 74 64 bf 01 00 00 00 e8 2b b6 46 f6 e8 76 7f 7e f6 fb bf 01 00 00 00 <e8> 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0000:ffffc9001b9dfdc0 EFLAGS: 00000282
RAX: b973bb43ad242700 RBX: 0000000000000000 RCX: b973bb43ad242700
RDX: 0000000000000000 RSI: ffffffff8d7e36cd RDI: 0000000000000001
RBP: ffffc9001b9dfe60 R08: ffffffff8f9db437 R09: 1ffffffff1f3b686
R10: dffffc0000000000 R11: fffffbfff1f3b687 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200373bfb8
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:exit_to_user_mode_loop kernel/entry/common.c:-1 [inline]
RIP: 0010:exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
RIP: 0010:irqentry_exit_to_user_mode+0x51/0x110 kernel/entry/common.c:73
Code: 07 85 c0 0f 85 c0 00 00 00 e8 ab 16 62 f6 65 4c 8b 34 25 08 90 8f 92 49 8b 3e f7 c7 37 03 00 00 74 50 49 89 ff e8 8f 15 62 f6 <4c> 89 f8 a8 30 74 08 e8 83 19 01 00 4c 89 f8 a9 00 01 00 00 74 0b
RSP: 0000:ffffc9001b9dff28 EFLAGS: 00000282
RAX: b973bb43ad242700 RBX: ffffc9001b9dff48 RCX: b973bb43ad242700
RDX: 0000000000000000 RSI: ffffffff8d7e36cd RDI: ffffffff8bc060e0
RBP: 0000000000000000 R08: ffffffff8f9db437 R09: 1ffffffff1f3b686
R10: dffffc0000000000 R11: fffffbfff1f3b687 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888026838000 R15: 0000000000000011
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0033:0x7f6ba2584526
Code: c4 18 c3 e8 2c dc 00 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8b 05 f1 c1 22 00 48 85 c0 74 14 48 83 ec 08 ff d0 85 c0 75 1a <31> c0 48 83 c4 08 c3 0f 1f 00 b8 e4 00 00 00 0f 05 85 c0 75 1d 31
RSP: 002b:00007f6ba3465050 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000046 RCX: 000000000000006d
RDX: 000000000000006d RSI: 00007f6ba34650b0 RDI: 000000002ca51e1a
RBP: 00007f6ba2623ce0 R08: 7fffffffffffffff R09: 3fffffffffffffff
R10: 4000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6ba27e6128 R14: 00007f6ba27e6090 R15: 00007fff2ecd52a8
 </TASK>
sched: DL replenish lagged too much