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
