Hi Greg, On 11/21/19, Greg KH <greg@xxxxxxxxx> wrote: > On Wed, Nov 20, 2019 at 09:28:14PM +1100, JH wrote: >> Hi, >> >> I am running 4G LTE (USB protocol) and WiFi on IMX6 board, the kernel >> is 4.19.75 LTE. It is not clear where the kernel alignment trap came >> from, the only thing I could see is the alignment trap message >> generated immediate after USB GSM communication or mwifiex_sdio. Where >> that the alignment trap came from? Which parts of the program could >> contribute the kernel alignment trap, kernel iteself, or USB GSM or >> mwifiex_sdio? Appreciate clues how to fix it. >> >> Nov 20 05:08:09 solar kernel: usb 1-1: GSM modem (1-port) converter >> now attached to ttyUSB0 >> Nov 20 05:08:09 solar kernel: option 1-1:1.2: GSM modem (1-port) >> converter detected >> Nov 20 05:08:09 solar kernel: usb 1-1: GSM modem (1-port) converter >> now attached to ttyUSB1 >> Nov 20 05:08:10 solar kernel: mwifiex_sdio mmc0:0001:1: info: trying >> to associate to 'Solar Analytics Wifi' bssid 78:8a:20:49:4b:c5 >> Nov 20 05:08:10 solar kernel: mwifiex_sdio mmc0:0001:1: info: >> associated to bssid 78:8a:20:49:4b:c5 successfully >> Nov 20 05:08:10 solar kernel: IPv6: ADDRCONF(NETDEV_CHANGE): mlan0: >> link becomes ready >> Nov 20 05:23:13 solar kernel: mwifiex_sdio mmc0:0001:1: info: >> successfully disconnected from 78:8a:20:49:4b:c5: reason code 3 >> Nov 20 05:23:13 solar kernel: IPv6: ADDRCONF(NETDEV_UP): mlan0: link >> is not ready >> Nov 20 05:23:18 solar kernel: Alignment trap: not handling instruction >> e8532f00 at [<b6c802b6>] >> Nov 20 05:23:18 solar kernel: Unhandled fault: alignment exception >> (0x001) at 0x38626667 >> Nov 20 05:23:18 solar kernel: pgd = 34bdb7e7 >> Nov 20 05:23:18 solar kernel: [38626667] *pgd=00000000 > > You should have a much longer tracedump after this, right? Can you > provide that please? That was the last statement from the kernel log journalctl -t kernel -b at the time. > And why do you think this was a USB issue? No, I was not saying it was a USB issue, nor did I know if it is a kernel issue or mwifiex_sdio issue or something else, I don't have the knowledge to determine it, that was why I have to go this list for help, I did try to connect to Linux network mailing list linux-net or kernel mailing list lkml, but I must get wrong with the mailing list address, I could not get response or subscription frin linux-net or lkml, if you could let me know the correct kernel network mailing address and kernel mailing list address, I'll ask the help there as well. Thanks Greg. - jh
