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For every boot on my Dell R7625, I get one of these: bnxt_en 0000:01:00.2 eno12419np2: renamed from eth2 usb 1-1.2: new low-speed USB device number 3 using xhci_hcd usb 1-1.2: New USB device found, idVendor=047b, idProduct=0011, bcdDevice= 1.00 usb 3-1: New USB device found, idVendor=1604, idProduct=10c0, bcdDevice= 0.00 usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 rcu: INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 96-.... } 3 jiffies s: 53 root: 0x40/. rcu: blocking rcu_node structures (internal RCU debug): l=1:96-111:0x1/. Sending NMI from CPU 0 to CPUs 96: NMI backtrace for cpu 96 CPU: 96 UID: 0 PID: 3241 Comm: kworker/96:1 Not tainted 6.15.0-rc7+ #254 NONE Hardware name: Dell Inc. PowerEdge R7625/06444F, BIOS 1.11.2 12/18/2024 Workqueue: usb_hub_wq hub_event [usbcore] RIP: 0010:vprintk_emit+0x360/0x430 Code: 87 01 0f 84 91 00 00 00 c6 05 36 ec 8a 01 01 c6 05 3c ec 8a 01 00 0f b6 05 28 ec 8a 01 84 c0 74 0d f3 90 0f b6 05 1b ec 8a 01 <84> c0 75 f3 e8 47 0d 00 00 80 e7 02 74 01 fb c7 05 bb ec 8c 01 00 RSP: 0018:ffffbe47220c7b78 EFLAGS: 00000002 RAX: 0000000000000001 RBX: 0000000000000246 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffffffff93019c48 RBP: ffffbe47220c7c48 R08: 00000000fffdffff R09: ffffa1bf658fffa8 R10: ffffa1bf64e00000 R11: 0000000000000002 R12: ffffbe47220c7be0 R13: ffffffff9260f8ee R14: ffffbe47220c7c58 R15: 0000000000000043 FS: 0000000000000000(0000) GS:ffffa14dd4a34000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000561066512398 CR3: 00000090a0a11002 CR4: 0000000000370ef0 Call Trace: dev_vprintk_emit+0x130/0x140 dev_printk_emit+0x3e/0x40 ? __dev_printk+0x2d/0x70 _dev_info+0x5c/0x5e usb_new_device.cold+0x87/0x3a0 [usbcore] hub_event+0x1113/0x1900 [usbcore] ? __schedule+0x4e5/0xaf0 process_one_work+0x140/0x2b0 worker_thread+0x2ea/0x430 ? process_one_work+0x2b0/0x2b0 kthread+0xd4/0x1d0 ? kthreads_online_cpu+0xf0/0xf0 ret_from_fork+0x2d/0x50 ? kthreads_online_cpu+0xf0/0xf0 ret_from_fork_asm+0x11/0x20 usb 3-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-1.2: Product: Standard USB Keyboard hub 3-1:1.0: USB hub found usb 1-1.2: Manufacturer: Silitek which appears to be this spin section: /* We spin waiting for the owner to release us */ spin_acquire(&console_owner_dep_map, 0, 0, _THIS_IP_); /* Owner will clear console_waiter on hand off */ while (READ_ONCE(console_waiter)) cpu_relax(); spin_release(&console_owner_dep_map, _THIS_IP_); Box is a 2-socket, with 2: AMD EPYC 9754 128-Core Processor CPUs installed. -- Jens Axboe