On 10.5.2021 14.05, Naresh Kamboju wrote: > On Mon, 10 May 2021 at 16:22, Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> wrote: >> >> On Mon, 10 May 2021 at 16:02, Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> wrote: >>> >>> The kernel crash reported on arm architecture BeagleBoard-X15 device running >>> Linux next 5.13.0-rc1-next-20210510 while booting the device. >>> >>> [ 4.956085] xhci-hcd xhci-hcd.1.auto: xHCI Host Controller >>> [ 4.961639] xhci-hcd xhci-hcd.1.auto: new USB bus registered, >>> assigned bus number 2 >>> [ 4.969360] xhci-hcd xhci-hcd.1.auto: Host supports USB 3.0 SuperSpeed >>> [ 4.976165] usb usb2: We don't know the algorithms for LPM for this >>> host, disabling LPM. >>> [ 4.985321] hub 2-0:1.0: USB hub found >>> [ 4.989196] hub 2-0:1.0: 1 port detected >>> [ 5.002197] Waiting for root device >>> PARTUUID=6b10e805-12ad-b44e-88b8-3abf3d5f52ed... >>> [ 5.022918] 8<--- cut here --- >>> [ 5.026000] Unhandled fault: imprecise external abort (0x1406) at 0x00000000 >>> [ 5.033root >>> 081] pgd = ff6a1748 >>> [ 5.035797] [00000000] *pgd=00000000 >>> [ 5.039398] Internal error: : 1406 [#1] SMP ARM >>> [ 5.043975] Modules linked in: >>> [ 5.047027] CPU: 0 PID: 22 Comm: kworker/0:1 Not tainted >>> 5.13.0-rc1-next-20210510 #1 >>> [ 5.054809] Hardware name: Generic DRA74X (Flattened Device Tree) >>> [ 5.060943] Workqueue: pm pm_runtime_work >>> [ 5.065002] PC is at xhci_hub_control+0xd00/0x248c >>> [ 5.069824] LR is at arm_heavy_mb+0x44/0x48 >> >> Since, this crash is not easily reproducible I could bisect it. > > sorry, i mean i could *not* > > Since, this crash is not easily reproducible I could not bisect it. Looks like USB SS roothub is trying to runtime suspend early during boot. Any chance you could look up the source line of xhci_hub_control+0xd00/0x248c in your kernel? gdb vmlinux li *(xhci_hub_control+0xd00) Thanks -Mathias
