No ufs remount: panic`ìng aarch64 boot from SD-card vfs_mountroot

[Klaus Küchemann]

panic`ìng aarch64 boot from SD-card since approx. 1-2 weeks on head 13-current:

I could `make installkernel`for months on many boards without problems…
Now panics, whereas 'boot boot / kernel.old' continues to be able to boot,
regardless of submarine version or dtb / dts.

Well, something significantly must have been changed the last days / weeks in GEOM / vfs / mount_ufs
or elsewhere ...
Just a "wild guess" (because of the many changes in that area in src):
--The mountroot issue began with -r356776-- .. just a guess (because that happened on RPI4)



This output is from r358133-xyimage.xz fresh installed / downloaded SD-card ( dd`d zero-cleaned with / dev / zero before) (RockPro64)…
No way to boot with 'ufs: / dev / mmcsd0xxx', `tried every possible combination:


—output----
Loader variables:
  vfs.root.mountfrom=ufs:/dev/ufs/rootfs
  vfs.root.mountfrom.options=rw

Manual root filesystem specification:
  <fstype>:<device> [options]
      Mount <device> using filesystem <fstype>
      and with the specified (optional) option list.

    eg. ufs:/dev/da0s1a
        zfs:zroot/ROOT/default
        cd9660:/dev/cd0 ro
          (which is equivalent to: mount -t cd9660 -o ro /dev/cd0 /)

  ?               List valid disk boot devices
  .               Yield 1 second (for background tasks)
  <empty line>    Abort manual input

mountroot> ?

List of GEOM managed disk devices:
  

mountroot>  „Enter"
mountroot>  filesystem specification:
panic: mountroot: unable to (re-)mount root.
cpuid = 0nt <device> using filesystem <fstype>
time = 105with the specified (optional) option list.
KDB: stack backtrace:
db_trace_self() at db_trace_self_wrapper+0x28
         pc = 0xffff000000750e2c  lr = 0xffff000000106bc8
         sp = 0xffff00004027b370  fp = 0xffff00004027b580
          (which is equivalent to: mount -t cd9660 -o ro /dev/cd0 /)
db_trace_self_wrapper() at vpanic+0x194
  ?      pc = 0xffff000000106bc8  lr = 0xffff00000040e0ac
  .      sp = 0xffff00004027b590  fp = 0xffff00004027b640
  <empty line>    Abort manual input
vpanic() at panic+0x44
mountroo pc = 0xffff00000040e0ac  lr = 0xffff00000040de54
         sp = 0xffff00004027b650  fp = 0xffff00004027b6d0
List of GEOM managed disk devices:
panic() at vfs_mountroot+0x1558
         pc = 0xffff00000040de54  lr = 0xffff0000004d795c
mountroo sp = 0xffff00004027b6e0  fp = 0xffff00004027b880

vfs_mountroot() at start_init+0x28
         pc = 0xffff0000004d795c  lr = 0xffff0000003a3e44
         sp = 0xffff00004027b890  fp = 0xffff00004027b940

start_init() at fork_exit+0x7c
         pc = 0xffff0000003a3e44  lr = 0xffff0000003cb7fc
         sp = 0xffff00004027b950  fp = 0xffff00004027b980

fork_exit() at fork_trampoline+0x10
         pc = 0xffff0000003cb7fc  lr = 0xffff00000076e514
         sp = 0xffff00004027b990  fp = 0x0000000000000000

KDB: enter: panic
[ thread pid 1 tid 100002 ]
Stopped at      0