rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-....: (1 GPs behind) idle=e7fc/1/0x4000000000000000 softirq=16185/16186 fqs=5248
rcu: hardirqs softirqs csw/system
rcu: number: 8679 0 0
rcu: cputime: 144 52345 4 ==> 52500(ms)
rcu: (t=10502 jiffies g=11605 q=2299 ncpus=2)
CPU: 1 UID: 0 PID: 5824 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:taprio_dequeue_from_txq+0x12c/0x980 net/sched/sch_taprio.c:726
Code: 04 20 84 c0 0f 85 bb 06 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 f5 a6 50 f8 83 e3 01 0f 85 62 01 00 00 48 89 6c 24 18 4c 89 f3 <4d> 8d 7e 18 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8
RSP: 0018:ffffc90000a08c70 EFLAGS: 00000246
RAX: ffffffff8970550b RBX: ffff8880791ee000 RCX: 0000000000000100
RDX: ffff8880278e0000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffffffff896fa876 R09: ffffffff8df41aa0
R10: 0000000000000001 R11: ffffffff8962ec10 R12: dffffc0000000000
R13: ffff888027ebc000 R14: ffff8880791ee000 R15: ffff88806ba52290
FS: 0000555562c1e500(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000f2000 CR3: 0000000060540000 CR4: 00000000003526f0
Call Trace:
taprio_dequeue_tc_priority+0x1ac/0x750 net/sched/sch_taprio.c:793
taprio_dequeue+0x186/0x550 net/sched/sch_taprio.c:-1
dequeue_skb net/sched/sch_generic.c:297 [inline]
qdisc_restart net/sched/sch_generic.c:402 [inline]
__qdisc_run+0x23f/0x1510 net/sched/sch_generic.c:420
qdisc_run+0xc7/0x300 include/net/pkt_sched.h:120
net_tx_action+0x717/0x900 net/core/dev.c:5782
handle_softirqs+0x22b/0x7c0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x60/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:finish_task_switch+0x242/0x940 kernel/sched/core.c:5114
Code: 0f 84 c2 01 00 00 48 85 db 0f 85 e9 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 c8 88 ca 09 e8 b3 10 37 00 fb 4c 8b 65 c0 <49> 8d bc 24 48 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc9000412f958 EFLAGS: 00000206
RAX: 000000000003d3a9 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8d792065 RDI: ffffffff8bc083e0
RBP: ffffc9000412f9b0 R08: ffffffff8f822277 R09: 1ffffffff1f0444e
R10: dffffc0000000000 R11: fffffbfff1f0444f R12: ffff8880278e0000
R13: dffffc0000000000 R14: ffff88802d913d00 R15: ffff8880b873b498
context_switch kernel/sched/core.c:5259 [inline]
__schedule+0x14a3/0x4fd0 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
do_nanosleep+0x1c5/0x610 kernel/time/hrtimer.c:2116
hrtimer_nanosleep+0x169/0x360 kernel/time/hrtimer.c:2163
__do_sys_clock_nanosleep kernel/time/posix-timers.c:1398 [inline]
__se_sys_clock_nanosleep+0x339/0x390 kernel/time/posix-timers.c:1375
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb2d27c2005
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007ffc0ce79e80 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 000000000000004a RCX: 00007fb2d27c2005
RDX: 00007ffc0ce79ec0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffc0ce79f2c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388
R13: 00000000000927c0 R14: 000000000001693d R15: 00007ffc0ce79f80
sched: DL replenish lagged too much