crash zfs_clone_range()

Hi,

Had this crash today on RPI4/15-CURRENT.

FreeBSD rpi4 15.0-CURRENT FreeBSD 15.0-CURRENT #19 main-b0203aaa46-dirty: Sat Nov  4 11:48:33 CET 2023     ronald@rpi4:/home/ronald/dev/freebsd/obj/home/ronald/dev/freebsd/src/arm64.aarch64/sys/GENERIC-NODEBUG arm64

$ sysctl -a | grep bclon
vfs.zfs.bclone_enabled: 1

I started a jail with poudriere to build a package. The jail uses null mounts over ZFS.

[root]# cu -s 115200 -l /dev/cuaU0
Connected

db> bt
Tracing pid 95213 tid 100438 td 0xffff0000e1e97900
db_trace_self() at db_trace_self
db_stack_trace() at db_stack_trace+0x120
db_command() at db_command+0x2e4
db_command_loop() at db_command_loop+0x58
db_trap() at db_trap+0x100
kdb_trap() at kdb_trap+0x334
handle_el1h_sync() at handle_el1h_sync+0x18
--- exception, esr 0xf2000000
kdb_enter() at kdb_enter+0x48
vpanic() at vpanic+0x1dc
panic() at panic+0x48
data_abort() at data_abort+0x2fc
handle_el1h_sync() at handle_el1h_sync+0x18
--- exception, esr 0x96000004
rms_rlock() at rms_rlock+0x1c
zfs_clone_range() at zfs_clone_range+0x68
zfs_freebsd_copy_file_range() at zfs_freebsd_copy_file_range+0x19c
null_bypass() at null_bypass+0x118
vn_copy_file_range() at vn_copy_file_range+0x18c
kern_copy_file_range() at kern_copy_file_range+0x36c
sys_copy_file_range() at sys_copy_file_range+0x8c
do_el0_sync() at do_el0_sync+0x634
handle_el0_sync() at handle_el0_sync+0x48
--- exception, esr 0x56000000


Oh.. While typing this I rebooted the machine and it happened again. I didn't start anything in particular although the machine runs some jails.

x0: 0x00000000000000e0
  x1: 0xffffa00090317a48
  x2: 0xffffa000f79d4f00
  x3: 0xffffa000c61a44a8
  x4: 0xffff0000deefe460 ($d.2 + 0xdd776560)
  x5: 0xffffa001250e4c00
  x6: 0xffff0000e54025b5 ($d.5 + 0xc)
  x7: 0x000000000000030a
  x8: 0xffff0000e1559000 ($d.2 + 0xdfdd1100)
  x9: 0x0000000000000001
 x10: 0x0000000000000000
 x11: 0x0000000000000001
 x12: 0x0000000000000002
 x13: 0x0000000000000000
 x14: 0x0000000000000001
 x15: 0x0000000000000000
 x16: 0xffff0000016dce88 (__stop_set_modmetadata_set + 0x1310)
 x17: 0xffff0000004e0d44 (rms_rlock + 0x0)
 x18: 0xffff0000deefe280 ($d.2 + 0xdd776380)
 x19: 0x0000000000000000
 x20: 0xffff0000deefe460 ($d.2 + 0xdd776560)
 x21: 0x7fffffffffffffff
 x22: 0xffffa00090317a48
 x23: 0xffffa000f79d4f00
 x24: 0xffffa001067ef910
 x25: 0x00000000000000e0
 x26: 0xffffa000158a8000
 x27: 0x0000000000000000
 x28: 0xffffa000158a8000
 x29: 0xffff0000deefe280 ($d.2 + 0xdd776380)
  sp: 0xffff0000deefe280
  lr: 0xffff000001623564 (zfs_clone_range + 0x6c)
 elr: 0xffff0000004e0d60 (rms_rlock + 0x1c)
spsr: 0x00000000a0000045
 far: 0x0000000000000108
 esr: 0x0000000096000004
panic: data abort in critical section or under mutex
cpuid = 1
time = 1699610885
KDB: stack backtrace:
db_trace_self() at db_trace_self
db_trace_self_wrapper() at db_trace_self_wrapper+0x38
vpanic() at vpanic+0x1a0
panic() at panic+0x48
data_abort() at data_abort+0x2fc
handle_el1h_sync() at handle_el1h_sync+0x18
--- exception, esr 0x96000004
rms_rlock() at rms_rlock+0x1c
zfs_clone_range() at zfs_clone_range+0x68
zfs_freebsd_copy_file_range() at zfs_freebsd_copy_file_range+0x19c
null_bypass() at null_bypass+0x118
vn_copy_file_range() at vn_copy_file_range+0x18c
kern_copy_file_range() at kern_copy_file_range+0x36c
sys_copy_file_range() at sys_copy_file_range+0x8c
do_el0_sync() at do_el0_sync+0x634
handle_el0_sync() at handle_el0_sync+0x48
--- exception, esr 0x56000000
KDB: enter: panic
[ thread pid 3792 tid 100394 ]
Stopped at      kdb_enter+0x48: str     xzr, [x19, #768]
db>

I'll keep the debugger open for a while. Can I type something for additional info?

Regards,
Ronald.