On Thu, 2025-06-26 at 10:09 +0200, Joakim Tjernlund wrote: > We have an app running on a squashfs RFS(XZ compressed) and a appfs also on squashfs. > Whenever we validate an SW update image(stream a image.xz, uncompress it and on to /dev/null), > the apps are starved/blocked and make almost no progress, system time in top goes up to 99+% > and the console also becomes unresponsive. > > This feels like kernel is stuck/busy in a loop and does not let apps execute. > > Kernel 5.15.185 > > Any ideas/pointers ? > > Jocke This will reproduce the stuck behaviour we see: > cd /tmp (/tmp is an tmpfs) > wget https://fullImage.xz So just downloading it to tmpfs will confuse squashfs, seems to me that squashfs somehow see the xz compressed pages in page cache/VFS and tried to do something with them. kernel 51.15.185 (aarch64) user space: ARM 32 bit with thumb
