On Thu, Nov 21, 2019 at 05:06:45PM +1100, JH wrote: > Hi Peter, > > On 11/21/19, Peter Chen <peter.chen@xxxxxxx> wrote: > > On 19-11-21 07:08:32, JH wrote: > >> 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. > >> > > > > Do you have correct firmware has loaded for your device? > > Not clear what the firmware you were talking about? I used open source > linux-firmware-sd8887, uBlox SARA-R4 and uBlox EMMY on IMX6. Let's say > we have been running this device for about 7 months, we used Kernel > 5.1.0 before, I could not recall any error about the alignment trap in > kernel. We now moved to kernel 4.19.75 LTS, that is what it occurred > often, that worries me. Why did you move to an older kernel? If it all works on a newer one, please stick with that, or use 'git bisect' to find the commit that breaks things. thanks, greg k-h
