(-EPROTO which in xhci translates to 'USB transaction error"). If I enable dynamic debug on xhci_hcd and cdc-acm I can see that all transfers have error code -71 This often leads to RCU stalls and sometimes Kernel panics. In the terminal indicating that the xhci event ring is full. When this happens we get a lot of "xhci-cdns3: ERROR unknown event type 37" It is likely that the modem is misbehaving. Sometimes we end up in a situation where all transfers over USB generetes 'USB transaction Errors". The modem presents it self as a cdc-acm device with 4 tty:s. There is a modem connected to the SoC via USB through a USB hub. We are running Linux 4.19.35 from NXP on the SoC. 16:39 ` Greg KH 0 siblings, 1 reply 25+ messages in threadįrom: Jonas Karlsson 15:05 UTC ( / raw) USB transaction errors causing RCU stalls and kernel panics All of help / color / mirror / Atom feed * USB transaction errors causing RCU stalls and kernel panics 15:05 Jonas Karlsson
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