Hi Ard, On Thu, May 26, 2022 at 10:19 AM Ard Biesheuvel <ardb@xxxxxxxxxx> wrote: > > On Thu, 26 May 2022 at 08:20, Tony Lindgren <tony@xxxxxxxxxxx> wrote: > > > > * Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx> [220526 05:45]: > > > On Tue, May 24, 2022 at 4:19 PM Tony Lindgren <tony@xxxxxxxxxxx> wrote: > > > > Maybe also try with CONFIG_MUSB_PIO_ONLY=y to see if it makes things > > > > better or worse :) > > > > > > PIO is always the last resort :-) And now it proves it again. With > > > PIO_ONLY the system doesn't stall. > > > > OK great :) So it has something to do with drivers/dma/ti/cppi41.c, or > > with drivers/usb/musb/cppi_dma.c or whatever the dma for am335x here > > is. Or maybe there's something using stack for buffers being passed to > > dma again that breaks with vmap stack. > > > > In order to confirm this theory, could you please try rebuilding your > kernel with CONFIG_VMAP_STACK disabled, and leave everything else as > before? I have disabled the CONFIG_VMAP_STACK option: # zcat /proc/config.gz | grep VMAP_STACK CONFIG_HAVE_ARCH_VMAP_STACK=y # CONFIG_VMAP_STACK is not set The system stalls.
