Hello all, I've a system with kernel 4.14.127 that is showing unexpected xhci-hcd (ASM1042A) errors with a Qualcomm based modem, when running the following test: - signal strength qmi requests looping every few seconds on /dev/cdc-wdm (driver qmi_wwan) - iperf tcp data connection test on the modem network interface The issue is showing also with kernel 5.0 The issues is showing in three different ways: First one: 2019-07-24 15:17:45.495293 kern.err kernel:xhci_hcd 0000:03:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 28 comp_code 13 2019-07-24 15:17:45.495392 kern.warning kernel:xhci_hcd 0000:03:00.0: Looking for event-dma 000000007725b420 trb-start 000000007725b400 trb-end 000000007725b400 seg-start 000000007725b000 seg-end 000000007725bff0 The full kernel log is available at https://drive.google.com/open?id=1FBjGhnc65vYks4MeOjliwmxA3FmCNbKw usb devices list is availabe at https://drive.google.com/open?id=1UgtwOaxGBcMc71CeOrlhxzPiHIADu1Cr Second one: 2019-07-24 17:24:09.588826 kern.debug kernel:xhci_hcd 0000:03:00.0: Set TR Deq Ptr cmd, new deq seg = ffff95c865e4e340 (0x77729000 dma), new deq ptr = ffff95c877729fc0 (0x77729fc0 dma), new cycle = 0 2019-07-24 17:24:09.588838 kern.warning kernel:xhci_hcd 0000:03:00.0: WARN Cannot submit Set TR Deq Ptr 2019-07-24 17:24:09.588847 kern.warning kernel:xhci_hcd 0000:03:00.0: A Set TR Deq Ptr command is pending. 2019-07-24 17:24:09.588855 kern.debug kernel:xhci_hcd 0000:03:00.0: // Ding dong! 2019-07-24 17:24:09.588863 kern.debug kernel:xhci_hcd 0000:03:00.0: Giveback URB ffff95c84f01e900, len = 0, expected = 1500, status = -71 2019-07-24 17:24:09.650800 kern.debug kernel:xhci_hcd 0000:03:00.0: WARN halted endpoint, queueing URB anyway. 2019-07-24 17:24:09.650861 kern.debug kernel:xhci_hcd 0000:03:00.0: WARN halted endpoint, queueing URB anyway. 2019-07-24 17:24:09.653715 kern.debug kernel:xhci_hcd 0000:03:00.0: Transfer error for slot 3 ep 29 on endpoint 2019-07-24 17:24:09.653774 kern.debug kernel:xhci_hcd 0000:03:00.0: Cleaning up stalled endpoint ring 2019-07-24 17:24:09.653786 kern.debug kernel:xhci_hcd 0000:03:00.0: Finding endpoint context 2019-07-24 17:24:09.653794 kern.debug kernel:xhci_hcd 0000:03:00.0: Cycle state = 0x0 2019-07-24 17:24:09.653802 kern.debug kernel:xhci_hcd 0000:03:00.0: New dequeue segment = ffff95c865e4e340 (virtual) 2019-07-24 17:24:09.653812 kern.debug kernel:xhci_hcd 0000:03:00.0: New dequeue pointer = 0x77729fd0 (DMA) 2019-07-24 17:24:09.653822 kern.debug kernel:xhci_hcd 0000:03:00.0: Queueing new dequeue state 2019-07-24 17:24:09.653863 kern.debug kernel:xhci_hcd 0000:03:00.0: Set TR Deq Ptr cmd, new deq seg = ffff95c865e4e340 (0x77729000 dma), new deq ptr = ffff95c877729fd0 (0x77729fd0 dma), new cycle = 0 The full kernel log is available at https://drive.google.com/open?id=1zNQa-nGLA3F_5yka8c0-syUBcTe4L8W2 usb devices list is availabe at https://drive.google.com/open?id=19bfAUfgF-jtiF--7eHgTo00mfwnLWMyf Third one: 2019-07-24 17:41:45.233364 kern.debug kernel:xhci_hcd 0000:03:00.0: // Ding dong! 2019-07-24 17:41:45.233372 kern.debug kernel:xhci_hcd 0000:03:00.0: Giveback URB ffff95c84d46ce40, len = 0, expected = 1514, status = -71 2019-07-24 17:41:45.234647 kern.debug kernel:xhci_hcd 0000:03:00.0: Ignoring reset ep completion code of 1 2019-07-24 17:41:45.237145 kern.debug kernel:xhci_hcd 0000:03:00.0: Successful Set TR Deq Ptr cmd, deq = @777e7350 2019-07-24 17:41:45.242662 kern.debug kernel:xhci_hcd 0000:03:00.0: Transfer error for slot 3 ep 28 on endpoint 2019-07-24 17:41:45.242698 kern.debug kernel:xhci_hcd 0000:03:00.0: Cleaning up stalled endpoint ring 2019-07-24 17:41:45.242705 kern.debug kernel:xhci_hcd 0000:03:00.0: Finding endpoint context 2019-07-24 17:41:45.242709 kern.debug kernel:xhci_hcd 0000:03:00.0: Cycle state = 0x1 2019-07-24 17:41:45.242712 kern.debug kernel:xhci_hcd 0000:03:00.0: New dequeue segment = ffff95c84f01dcc0 (virtual) 2019-07-24 17:41:45.242717 kern.debug kernel:xhci_hcd 0000:03:00.0: New dequeue pointer = 0x777e7360 (DMA) 2019-07-24 17:41:45.242721 kern.debug kernel:xhci_hcd 0000:03:00.0: Queueing new dequeue state 2019-07-24 17:41:45.242726 kern.debug kernel:xhci_hcd 0000:03:00.0: Set TR Deq Ptr cmd, new deq seg = ffff95c84f01dcc0 (0x777e7000 dma), new deq ptr = ffff95c8777e7360 (0x777e7360 dma), new cycle = 1 The full kernel log is available at https://drive.google.com/file/d/1r4lyF6mcXJXwaAKb2dxIptMTsWCbxALg/view?usp=sharing I'm not expert enough to understand if this is an xhci host issue or a device one. Can someone help on this? Thanks in advance, Daniele
