On Sat, 7 Aug 2021, Mikael Pettersson wrote: > I updated the 5.10 longterm kernel on one of my m68k/aranym VMs from > 5.10.47 to 5.10.56, and the new kernel failed to boot: > > ARAnyM 1.1.0 > Using config file: 'aranym1.headless.config' > Could not open joystick 0 > ARAnyM RTC Timer: /dev/rtc: Permission denied > ARAnyM LILO: Error loading ramdisk 'root.bin' > Blitter tried to read byte from register ff8a00 at 0077ee > > At this point it kept running, but produced no output to the console, > and would never get to the point of starting user-space. Attaching gdb > to aranym showed nothing interesting, i.e. it seemed to be executing > normally. > > A git bisect identified the following commit between 5.10.52 and > 5.10.53 as the culprit: > # first bad commit: [9e1cf2d1ed37c934c9935f2c0b2f8b15d9355654] > mm/userfaultfd: fix uffd-wp special cases for fork() > That commit appeared in mainline between v5.13 and v5.14-rc1. Is mainline also affected? e.g. v5.14-rc4. > 5.10.52, 5.11.22, 5.12.19, and 5.13.8 all boot fine. 5.10.53 to > 5.10.56 all fail as described above. > > grep ^CONFIG .config below, everything omitted is of course disabled, > including I might add CONFIG_USERFAULTFD. > > /Mikael >
