[Bug 270811] ZFS/PowerPC: Issue after openzfs/zfs@431083f75 import

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270811

--- Comment #7 from Danilo G. Baio <dbaio@freebsd.org> ---
FYI, I've just tested it again with an updated tree.

- 43c6b7a60aff069da7e0ba6c87d3d7a532e812f6 - clean

Timecounters tick every 1.000 msec

fatal kernel trap:

   exception       = 0x800 (floating-point unavailable)
   srr0            = 0xc0000000033bb0b0 (0x10bb0b0)
   srr1            = 0x9000000000009032
   current msr     = 0x9000000000009032
   lr              = 0xc0000000024df57c (0x1df57c)
   frame           = 0xc00800000000bfd0
   curthread       = 0xc000000003654e80
          pid = 0, comm = swapper

panic: floating-point unavailable trap
cpuid = 0
time = 2
KDB: stack backtrace:
0xc00800000000bbf0: at kdb_backtrace+0x60
0xc00800000000bd00: at vpanic+0x1b8
0xc00800000000bdb0: at panic+0x44
0xc00800000000bde0: at trap+0x324
0xc00800000000bf10: at powerpc_interrupt+0x1cc
0xc00800000000bfa0: kernel FPU trap by zfs_sha256_ppc: srr1=0x9000000000009032
            r1=0xc00800000000c250 cr=0x42200842 xer=0 ctr=0xc0000000024df55c
r2=0xc0000000033f2000 frame=0xc00800000000bfd0
0xc00800000000c250: at -0x4
0xc00800000000c280: at SHA2Update+0x200
0xc00800000000c330: at abd_checksum_sha256+0x128
0xc00800000000c360: at abd_iterate_func+0x170
0xc00800000000c450: at abd_checksum_sha256+0x78
0xc00800000000c5b0: at chksum_fini+0x3e0
0xc00800000000c6b0: at chksum_fini+0x134
0xc00800000000c6f0: at chksum_init+0x23c
0xc00800000000c770: at spa_init+0x184
0xc00800000000c7f0: at zfs_kmod_init+0x38
0xc00800000000c860: at zfsdev_detach+0x478
0xc00800000000c8e0: at module_register_init+0x114
0xc00800000000c980: at mi_startup+0x1f4
0xc00800000000ca50: at __start+0xc4
KDB: enter: panic
[ thread pid 0 tid 100000 ]
Stopped at      kdb_enter+0x70: ori     r0, r0, 0x0
db>



- 43c6b7a60aff069da7e0ba6c87d3d7a532e812f6 - with jhibbits patch


Mounting from zfs:zroot failed with error 6; retrying for 3 more seconds
Mounting from zfs:zroot failed with error 6.

Loader variables:
  vfs.root.mountfrom=zfs:zroot

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>

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