https://bugzilla.samba.org/show_bug.cgi?id=11588

--- Comment #11 from Theodore Ts'o <ty...@mit.edu> ---
Re: #9.  I'm not able to reproduce the described behavior.   If you want to
follow up on what you think is a kernel bug, please send a simple repro program
or script and what version of the kernel you are using to the linux-ext4
mailing list.   Thanks!!

Cheers,

<tytso@callcc> {/usr/projects/docker/dropbox}   (master)
1009% fallocate -o 0 -l 128M test.file
<tytso@callcc> {/usr/projects/docker/dropbox}   (master)
1010% filefrag  -v test.file
Filesystem type is: ef53
File size of test.file is 134217728 (32768 blocks of 4096 bytes)
 ext:     logical_offset:        physical_offset: length:   expected: flags:
   0:        0..    4095:   55990272..  55994367:   4096:             unwritten
   1:     4096..    8191:   56025088..  56029183:   4096:   55994368: unwritten
   2:     8192..   10239:   56170496..  56172543:   2048:   56029184: unwritten
   3:    10240..   14335:   56180736..  56184831:   4096:   56172544: unwritten
   4:    14336..   16383:   56252416..  56254463:   2048:   56184832: unwritten
   5:    16384..   20479:   56229888..  56233983:   4096:   56254464: unwritten
   6:    20480..   28671:   56305664..  56313855:   8192:   56233984: unwritten
   7:    28672..   32767:   56352768..  56356863:   4096:   56313856:
last,unwritten,eof
test.file: 8 extents found
<tytso@callcc> {/usr/projects/docker/dropbox}   (master)
1011% xfs_io -c "fpunch 65536 65536" test.file
<tytso@callcc> {/usr/projects/docker/dropbox}   (master)
1012% filefrag  -v test.file
Filesystem type is: ef53
File size of test.file is 134217728 (32768 blocks of 4096 bytes)
 ext:     logical_offset:        physical_offset: length:   expected: flags:
   0:        0..      15:   55990272..  55990287:     16:             unwritten
   1:       32..    4095:   55990304..  55994367:   4064:             unwritten
   2:     4096..    8191:   56025088..  56029183:   4096:   55994368: unwritten
   3:     8192..   10239:   56170496..  56172543:   2048:   56029184: unwritten
   4:    10240..   14335:   56180736..  56184831:   4096:   56172544: unwritten
   5:    14336..   16383:   56252416..  56254463:   2048:   56184832: unwritten
   6:    16384..   20479:   56229888..  56233983:   4096:   56254464: unwritten
   7:    20480..   28671:   56305664..  56313855:   8192:   56233984: unwritten
   8:    28672..   32767:   56352768..  56356863:   4096:   56313856:
last,unwritten,eof
test.file: 8 extents found
<tytso@callcc> {/usr/projects/docker/dropbox}   (master)
1013% uname -a
Linux callcc 4.8.0-00041-gecd2f69 #3 SMP Mon Oct 3 02:56:05 EDT 2016 x86_64
GNU/Linux

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