[schilytools] star hangs randomly during copy from ZFS to ZFS

[Lasse Kliemann]

FreeBSD 14.1-RELEASE-p5 GENERIC amd64

star: star 1.7.0 (amd64-unknown-freebsd14.1) 2023/01/11
Options: acl-POSIX.1e-draft acl-NFSv4 find fflags remote

Installed with 'pkg install star'.

/data1 and /test are mountpoints of encrypted ZFS datasets, where /test is empty initially and /data1 is mounted read-only.

Now, consider:

star -vv -debug -copy -p -xdot -acl -C /data1 . /test

This command hangs, that is, it seemingly stops doing anything after a couple hundred GB have been transferred. Attempted several times. The number of GB copied before this happens is different each time. Output:

star: Block size 20 blocks (10240 bytes).
star: WARNING: fsync() disabled from '/usr/local/etc/default/star'.
star: shared memory segment attached at: 82555E000 size 8413184
pid:      40827 (40827) copy 1 cflag 0 get process
waitchan: 0
putptr:   825561000
getptr:   825561000
base:     825561000
end:      825D63000
size:     8396800
ibs:      8396800
obs:      10240
amt:      0
icnt:     0
ocnt:     0
iblocked: 0
oblocked: 0
mayoblock:0
m1:       0
m2:       0
chreel:   0
reelwait: 0
eflags:   00
pflags:   00
flags:    00
hiw:      5597866
low:      2798933
puts:     0
gets:     0
empty:    0
full:     0
maxfill:  0
moves:    0
mbytes:   0
hdrtype:          exustar (9)
pr_maxsize:       unlimited
pr_flags:         0x5F13
pr_xhdflags:      0x7
pr_xhmask:        0xFFFFFFFF
pr_fillc:         '0'
pr_diffmask:      
pr_nflags:        0x7
pr_maxnamelen:    2147483647
pr_maxlnamelen:   2147483647
pr_maxsname:      100
pr_maxslname:     100
pr_maxprefix:     130
pr_sparse_in_hdr: 0
dev_minorbits:    0
star: Flag/File: '(NULL POINTER)'.
star: Dirp: '(NULL POINTER)' Dir: (NULL POINTER).
closepattern(), maxplen 0
npat: 0 narg: 0
npat: 0 narg: 0
dochdir(/test) = 0
star: Flag/File: '-C'.
star: Dirp: '/data1' Dir: /data1.
dochdir(/root) = 0
dochdir(/data1) = 0
Release     star 1.7.0 (amd64-unknown-freebsd14.1) 2023/01/11
Archtype    exustar
Dumpdate    1730743644.987746742 (Mon Nov  4 19:07:24 2024)
Volno       1
Blocksize   20 records
x       0 drwxr-xr-x+  5 root/wheel Aug  2 07:36 2024 ./

... Here come many filenames ...

The last line is cut-off somewhere in the middle.

star process is still there, but seemingly doing nothing:

USER      PID  %CPU %MEM    VSZ   RSS TT  STAT STARTED       TIME COMMAND
root    40827   0.0  0.1  35012  8636  5  I    19:07      9:16.21 star -vv -debug -copy -p -xdot -acl -C /data1 . /test
root    41086   0.0  0.1  37572  8636  5  I    19:07     18:30.39 star -vv -debug -copy -p -xdot -acl -C /data1 . /test

/var/log/messages is quiet.

'zpool status' is all OK.

bsdtar on the same machine works fine: tar -cf - -C /data1 . | tar -xpf - -C /test

So I did the transfer with bsdtar now, but I wonder what is the issue with star. I have used star for such tasks several times over two decades and never encountered anything like this.

-- 
Kind Regards / MfG
Dr. Lasse Kliemann
Westring 269, 24116 Kiel, Germany
E-Mail: lasse at lassekliemann.de
Telegram.org: @lassekliemann
Signal.org: +49 162 66 88 468
Website: https://lassekliemann.de
OpenPGP key: https://lassekliemann.de/gpg-common.asc
4D69 BC04 CD1F 7589 334B  0B00 9FC2 FEE9 AE69 652A
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