rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-....: (10499 ticks this GP) idle=21fc/1/0x4000000000000000 softirq=333298/333298 fqs=5240
rcu: hardirqs softirqs csw/system
rcu: number: 6041 0 0
rcu: cputime: 199 52288 6 ==> 52490(ms)
rcu: (t=10500 jiffies g=226109 q=1422 ncpus=2)
CPU: 0 UID: 0 PID: 6707 Comm: syz.8.8355 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:taprio_dequeue_tc_priority+0x1ac/0x750 net/sched/sch_taprio.c:-1
Code: e8 d9 29 50 f8 42 0f b6 44 25 00 84 c0 0f 85 a6 02 00 00 41 8b 75 00 48 8b 7c 24 48 48 8b 54 24 50 8b 4c 24 1c e8 b4 05 00 00 <48> 89 44 24 10 48 8b 44 24 58 42 0f b6 04 20 84 c0 0f 85 96 02 00
RSP: 0018:ffffc90000007cd8 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888067943d00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff888086a31800
RBP: 1ffff11005cf6a6a R08: ffffffff89702936 R09: ffffffff8df41aa0
R10: 0000000000000001 R11: ffffffff89635210 R12: dffffc0000000000
R13: ffff88802e7b5354 R14: 0000000000000010 R15: 0000000000000002
FS: 00007fd669bf66c0(0000) GS:ffff888125e1c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f81fc1e7dac CR3: 00000000a8f26000 CR4: 00000000003526f0
Call Trace:
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:5795
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:lock_acquire+0x222/0x340 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 70 50 bc 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 5a 4f e2 10 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 3f 2f bf 09 cc 48 8d 3d 17 8d e7
RSP: 0018:ffffc900034973b8 EFLAGS: 00000286
RAX: 2c038b6c94d2a900 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000004e24fd9d RSI: ffffffff8d978268 RDI: ffffffff8bc086e0
RBP: ffffffff8173fdd5 R08: ffffffff8173fdd5 R09: ffffffff8df41aa0
R10: ffffc90003497518 R11: ffffffff81acf4d0 R12: 0000000000000002
R13: ffffffff8df41aa0 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0xc2/0x23d0 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
__call_rcu_common kernel/rcu/tree.c:3119 [inline]
call_rcu+0xee/0x890 kernel/rcu/tree.c:3239
kernfs_put+0x18e/0x470 fs/kernfs/dir.c:591
kernfs_remove_by_name_ns+0xb7/0x130 fs/kernfs/dir.c:1723
kernfs_remove_by_name include/linux/kernfs.h:633 [inline]
remove_files fs/sysfs/group.c:28 [inline]
sysfs_remove_group+0xfc/0x2f0 fs/sysfs/group.c:328
sysfs_remove_groups+0x54/0xb0 fs/sysfs/group.c:352
destroy_port drivers/infiniband/core/sysfs.c:1278 [inline]
ib_free_port_attrs+0x281/0x3b0 drivers/infiniband/core/sysfs.c:1408
remove_one_compat_dev drivers/infiniband/core/device.c:1038 [inline]
rdma_dev_exit_net+0x1d8/0x340 drivers/infiniband/core/device.c:1176
ops_exit_list net/core/net_namespace.c:199 [inline]
ops_undo_list+0x49a/0x990 net/core/net_namespace.c:252
setup_net+0x2e8/0x330 net/core/net_namespace.c:462
copy_net_ns+0x3e3/0x570 net/core/net_namespace.c:581
create_new_namespaces+0x3e7/0x6a0 kernel/nsproxy.c:130
unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:226
ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3171
__do_sys_unshare kernel/fork.c:3242 [inline]
__se_sys_unshare kernel/fork.c:3240 [inline]
__x64_sys_unshare+0x38/0x50 kernel/fork.c:3240
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: 0033:0x7fd66b98f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd669bf6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fd66bbe6090 RCX: 00007fd66b98f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006a040000
RBP: 00007fd66ba13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd66bbe6128 R14: 00007fd66bbe6090 R15: 00007fffe5353388
sched: DL replenish lagged too much