Hi,

Repeated panics on 14-CURRENT/aarch64. This happens e.g. when the nigthly 
backup is started.
# uname -a
FreeBSD rpi4 14.0-CURRENT FreeBSD 14.0-CURRENT #22 main-5f702d6d9a: Mon Feb 28 
06:12:48 CET 2022     
ronald@rpi4:/home/ronald/dev/obj/home/ronald/dev/freebsd/arm64.aarch64/sys/GENERIC-NODEBUG
 arm64

It was stable with all kernels until (and including) "FreeBSD 14.0-CURRENT #21 
main-e11ad014d1-dirty: Sat Feb  5 00:09:08 CET 2022".

It runs ZFS-on-root via an USB disk. No other FS involved.
# gpart show
=>        40  1953458096  da0  GPT  (931G)
         40      102400    1  efi  (50M)
     102440     8388608    2  freebsd-swap  (4.0G)
    8491048  1944967088    3  freebsd-zfs  (927G)


Output on serial console:
x0: ffffa000059c1380 x1: ffffa000059b1600 x2: 3 x3: ffffa001862779a0 x4: 0 x5: 9438238792a1a
 x6:    d217e9df58308
 x7:               14
 x8: ffffa000059c1398
 x9:                1
x10: ffffa000059b1600
x11:                2
x12:                1
x13: f2557a42c5b0f240
x14: 1013e6b85a8ecbe4
x15:     24f981889f30
x16: ffff4afedeb89cb8
x17: fffffffffffffff2
x18: ffff0000fe666800 (g_ctx + fcfa6a54)
x19:                0
x20: ffff0000fec41000 (g_ctx + fd581254)
x21:                3
x22: ffff0000419bb090 (g_ctx + 402fb2e4)
x23: ffff000000c09bb7 (lockstat_enabled + 0)
x24:              180
x25: ffff000000c09000 (sdt_vfs_vop_vop_spare1_entry + 28)
x26: ffff000000c09000 (sdt_vfs_vop_vop_spare1_entry + 28)
x27: ffff000000c09000 (sdt_vfs_vop_vop_spare1_entry + 28)
x28:                0
x29: ffff0000fe666800 (g_ctx + fcfa6a54)
 sp: ffff0000fe666800
 lr: ffff00000154ca38 (zio_dva_throttle + 13c)
elr: ffff00000154ca80 (zio_dva_throttle + 184)
spsr:         20000045
far:     1f24979f8000
panic: Unknown kernel exception 0 esr_el1 2000000
cpuid = 2
time = 1646433952
KDB: stack backtrace:
db_trace_self() at db_trace_self
db_trace_self_wrapper() at db_trace_self_wrapper+0x30
vpanic() at vpanic+0x174
panic() at panic+0x44
do_el1h_sync() at do_el1h_sync+0x184
handle_el1h_sync() at handle_el1h_sync+0x10
--- exception, esr 0x2000000
zio_dva_throttle() at zio_dva_throttle+0x184
zio_execute() at zio_execute+0x58
KDB: enter: panic
[ thread pid 0 tid 100128 ]
Stopped at      kdb_enter+0x44: undefined       f901c11f
db>


I'm going to build a newer kernel to see if the problem persists. I can keep 
the current kernel to reproduce this if needed.

Regards,
Ronald.

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