rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=311c/1/0x4000000000000000 softirq=15303/15305 fqs=5168
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:        0          0            0
rcu: 	cputime:      190      52299            8   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=12297 q=1161 ncpus=2)
CPU: 1 UID: 0 PID: 5209 Comm: udevd Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:qdisc_peek_head+0x4/0x40 include/net/sch_generic.h:1114
Code: 38 c1 0f 8c c3 fe ff ff 4c 89 e7 e8 26 cb 21 f8 e9 b6 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <53> 48 89 fb e8 13 96 b9 f7 48 81 c3 d8 00 00 00 48 89 d8 48 c1 e8
RSP: 0018:ffffc90000a08a98 EFLAGS: 00000246
RAX: 1ffffffff20bb783 RBX: ffffffff905dbc18 RCX: dffffc0000000000
RDX: ffff88807e7d8000 RSI: 0000000000000000 RDI: ffff8880348d1000
RBP: ffff8880348d1000 R08: ffffffff8a181c3f R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8a09e0e0 R12: 0000000000000002
R13: ffff8880127ad800 R14: 000000000000026f R15: ffff888060d48000
FS:  00007fb563e9ac80(0000) GS:ffff88812510f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000300a0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 taprio_dequeue_from_txq+0x17f/0x940 net/sched/sch_taprio.c:720
 taprio_dequeue_tc_priority+0x1bb/0x7a0 net/sched/sch_taprio.c:787
 taprio_dequeue+0x186/0x550 net/sched/sch_taprio.c:-1
 dequeue_skb net/sched/sch_generic.c:293 [inline]
 qdisc_restart net/sched/sch_generic.c:398 [inline]
 __qdisc_run+0x272/0x2180 net/sched/sch_generic.c:416
 qdisc_run+0xda/0x270 include/net/pkt_sched.h:127
 net_tx_action+0x898/0xa50 net/core/dev.c:5538
 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:561
 __do_softirq kernel/softirq.c:595 [inline]
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:662
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x167/0x2f0 arch/x86/include/asm/irqflags.h:-1
Code: c7 44 24 10 00 00 00 00 9c 8f 44 24 10 f7 44 24 10 00 02 00 00 0f 85 fd 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 65 48 8b 45 00 <48> 3b 44 24 38 0f 85 72 01 00 00 48 83 c4 40 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90003517cc8 EFLAGS: 00000206
RAX: f90ab59230987d00 RBX: ffffffff8ee4e8e0 RCX: f90ab59230987d00
RDX: 0000000000000000 RSI: ffffffff8e4ca585 RDI: ffffffff8ca0f580
RBP: ffffffff93611020 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000246 R15: 0000000000000000
 fs_reclaim_acquire+0xaf/0x130 mm/page_alloc.c:3870
 might_alloc include/linux/sched/mm.h:318 [inline]
 slab_pre_alloc_hook mm/slub.c:4089 [inline]
 slab_alloc_node mm/slub.c:4167 [inline]
 kmem_cache_alloc_noprof+0x49/0x390 mm/slub.c:4194
 getname_flags+0xb6/0x530 fs/namei.c:146
 do_readlinkat+0xd7/0x380 fs/stat.c:563
 __do_sys_readlink fs/stat.c:601 [inline]
 __se_sys_readlink fs/stat.c:598 [inline]
 __x64_sys_readlink+0x7f/0x90 fs/stat.c:598
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb563b17d47
Code: 73 01 c3 48 8b 0d e1 90 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b1 90 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007ffed3830078 EFLAGS: 00000246 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007ffed3830088 RCX: 00007fb563b17d47
RDX: 0000000000000400 RSI: 00007ffed3830088 RDI: 00007ffed3830568
RBP: 0000000000000400 R08: 00005641ceb7d684 R09: 0000000000000000
R10: 0000000000000812 R11: 0000000000000246 R12: 00007ffed3830568
R13: 00007ffed38304d8 R14: 00005641ceb6d910 R15: 0000000000000000
 </TASK>
sched: DL replenish lagged too much