rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-....: (1 GPs behind) idle=c50c/1/0x4000000000000000 softirq=70738/70740 fqs=5244
rcu: hardirqs softirqs csw/system
rcu: number: 6032 0 0
rcu: cputime: 635 51853 5 ==> 52500(ms)
rcu: (t=10501 jiffies g=51525 q=2983 ncpus=2)
CPU: 0 UID: 0 PID: 14183 Comm: syz.1.2100 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x70 kernel/kcov.c:213
Code: 00 00 00 48 8b 3d 54 0e da 0b 48 89 de 5b e9 b3 fb 5a 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <48> 8b 04 24 65 48 8b 0c 25 08 10 80 92 65 8b 15 58 18 bf 10 81 e2
RSP: 0018:ffffc90000007cd0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888044fb8000
RDX: 0000000000000100 RSI: 0000000000000010 RDI: 000000000000000b
RBP: 1ffff1100613ae6a R08: ffffffff896fcc56 R09: ffffffff8df41aa0
R10: 0000000000000001 R11: ffffffff89631050 R12: dffffc0000000000
R13: ffff8880309d7354 R14: 0000000000000010 R15: 0000000000000002
FS: 000055556a002500(0000) GS:ffff888125e1f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa42f7c2d58 CR3: 0000000046b94000 CR4: 00000000003526f0
Call Trace:
taprio_dequeue_tc_priority+0x2d0/0x750 net/sched/sch_taprio.c:803
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 08 a9 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:ffffc90005527958 EFLAGS: 00000202
RAX: 0000000000000c91 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8d792329 RDI: ffffffff8bc08360
RBP: ffffc900055279b0 R08: ffffffff8f822377 R09: 1ffffffff1f0446e
R10: dffffc0000000000 R11: fffffbfff1f0446f R12: ffff888044fb8000
R13: dffffc0000000000 R14: ffff888031d41e80 R15: ffff8880b863b498
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: 0033:0x7f2fbffc2005
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:00007ffc6ca62520 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00007f2fc01e5fa0 RCX: 00007f2fbffc2005
RDX: 00007ffc6ca62560 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f2fc01e7da0 R08: 0000000000000000 R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000046648
R13: 00007f2fc01e5fa0 R14: ffffffffffffffff R15: 00007ffc6ca626a0
sched: DL replenish lagged too much