16248 2026-04-16 06:58:11 +0000 AB-INT: boot hang in qemu (xhci_hcd central error) 2026-10-15 15:03:05 +0000 1 1 10 QA/Testing Runtime Testing general unspecified x86 Multiple RESOLVED WORKSFORME AB-INT Medium normal 6.1 1 mathieu.dubois-briand unassigned randy.macleod --- --- No (bug/feature does not impact docs) oldest_to_newest 105097 0 mathieu.dubois-briand 2026-04-16 06:58:11 +0000 Yet another qemu boot failure: Central error: [ 22.672275] xhci_hcd 0000:00:04.0: Error while assigning device slot ID: Command Ring Stopped *********************** [ 0.842084] Run /sbin/init as init process [ 0.842175] with arguments: [ 0.842176] /sbin/init [ 0.842177] with environment: [ 0.842178] HOME=/ [ 0.842178] TERM=linux [ 21.889260] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 21.891833] rcu: 3-...0: (1 GPs behind) idle=0b84/1/0x4000000000000000 softirq=29/30 fqs=2559 [ 21.894388] rcu: (detected by 0, t=5252 jiffies, g=-1143, q=194 ncpus=4) [ 21.896416] Sending NMI from CPU 0 to CPUs 3: [ 22.672275] xhci_hcd 0000:00:04.0: Error while assigning device slot ID: Command Ring Stopped [ 22.673006] xhci_hcd 0000:00:04.0: Max number of devices this xHCI host supports is 64. [ 22.673364] usb usb1-port1: couldn't allocate usb_device [ 31.904741] rcu: rcu_preempt kthread starved for 2494 jiffies! g-1143 f0x0 RCU_GP_DOING_FQS(6) ->state=0x0 ->cpu=2 [ 31.904745] NMI backtrace for cpu 3 [ 31.904754] CPU: 3 UID: 0 PID: 106 Comm: S04udev Not tainted 6.18.19-yocto-standard #1 PREEMPT [ 31.904757] Hardware name: linux,dummy-virt (DT) [ 31.904758] pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 31.904760] pc : handle_softirqs+0xa4/0x360 [ 31.904765] lr : __do_softirq+0x1c/0x28 [ 31.904767] sp : ffff800081703f30 *********************** Central error: [ 31.923156] xhci_hcd 0000:00:04.0: Error while assigning device slot ID: Command Ring Stopped *********************** [ 31.904809] copy_page+0x48/0xc0 (P) [ 31.904811] copy_user_highpage+0x1c/0x40 [ 31.904813] do_wp_page+0x258/0xb40 [ 31.904816] __handle_mm_fault+0x538/0xc90 [ 31.904819] handle_mm_fault+0x98/0x2b0 [ 31.904821] do_page_fault+0x154/0x768 [ 31.904823] do_mem_abort+0x48/0xa0 [ 31.904825] el0_da+0x2c/0x88 [ 31.904827] el0t_64_sync_handler+0xd0/0xe8 [ 31.904829] el0t_64_sync+0x198/0x1a0 [ 31.923156] xhci_hcd 0000:00:04.0: Error while assigning device slot ID: Command Ring Stopped [ 31.923288] rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. [ 31.927451] xhci_hcd 0000:00:04.0: Max number of devices this xHCI host supports is 64. [ 31.927515] rcu: RCU grace-period kthread stack dump: [ 31.931193] usb usb1-port2: couldn't allocate usb_device [ 31.931243] task:rcu_preempt state:I stack:0 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00000010 [ 31.940533] Call trace: [ 31.940889] __switch_to+0xf0/0x1c8 (T) [ 31.941427] __schedule+0x35c/0xb10 [ 31.941937] schedule+0x3c/0x120 [ 31.942330] schedule_timeout+0x88/0x128 105100 1 mathieu.dubois-briand 2026-04-16 07:10:33 +0000 qemuarm64-musl-ptest ubuntu2204-vk-arm2 mathieu/master-next completed at 2026-04-14 16:35:01+00:00 https://valkyrie.yocto.io/pub/non-release/20260414-91/testresults/qemuarm64-musl-ptest/ https://autobuilder.yoctoproject.org/valkyrie/#/builders/109/builds/273/steps/13/logs/stdio 105404 2 mathieu.dubois-briand 2026-05-11 08:54:21 +0000 pkgman-non-rpm debian11-vk-3 master completed at 2026-05-09 02:29:15+00:00 https://autobuilder.yoctoproject.org/valkyrie/#/builders/67/builds/3763/steps/22/logs/stdio 107080 3 randy.macleod 2026-10-15 15:03:05 +0000 Re-open if it happens again.