linux-ext4 - [Bug 220594] Online defragmentation has broken in 6.16

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Message-ID: <bug-220594-13602-B787bQ83UU@https.bugzilla.kernel.org/>
Date: Thu, 20 Nov 2025 06:52:18 +0000
From: bugzilla-daemon@...nel.org
To: linux-ext4@...r.kernel.org
Subject: [Bug 220594] Online defragmentation has broken in 6.16

https://bugzilla.kernel.org/show_bug.cgi?id=220594

--- Comment #10 from Artem S. Tashkinov (aros@....com) ---
openat(AT_FDCWD, "/home/birdie/.config/google-chrome/Default/Sync
Data/LevelDB/000435.log", O_RDWR) = 3
ioctl(3, FS_IOC_FIEMAP, {fm_start=0, fm_length=18446744073709551615,
fm_flags=FIEMAP_FLAG_SYNC, fm_extent_count=512} => {fm_flags=FIEMAP_FLAG_SYNC,
fm_mapped_extents=4, ...}) = 0
fstatfs(3, {f_type=EXT2_SUPER_MAGIC, f_bsize=4096, f_blocks=6177397,
f_bfree=4170566, f_bavail=3852103, f_files=1572864, f_ffree=1433202,
f_fsid={val=[0xbbd03838, 0xb062f9ed]}, f_namelen=255, f_frsize=4096,
f_flags=ST_VALID|ST_NOATIME}) = 0
fcntl(3, F_GETLK, {l_type=F_UNLCK, l_whence=SEEK_SET, l_start=0, l_len=0,
l_pid=0}) = 0
fsync(3)                                = 0
openat(AT_FDCWD, "/home/birdie/.config/google-chrome/Default/Sync
Data/LevelDB/000435.log.defrag", O_WRONLY|O_CREAT|O_EXCL, 0400) = 4
unlink("/home/birdie/.config/google-chrome/Default/Sync
Data/LevelDB/000435.log.defrag") = 0
fallocate(4, 0, 0, 139264)              = 0
ioctl(4, FS_IOC_FIEMAP, {fm_start=0, fm_length=18446744073709551615,
fm_flags=FIEMAP_FLAG_SYNC, fm_extent_count=512} => {fm_flags=FIEMAP_FLAG_SYNC,
fm_mapped_extents=1, ...}) = 0
[1/1]/home/birdie/.config/google-chrome/Default/Sync Data/LevelDB/000435.log:  
  0%) = 97
mmap(NULL, 139264, PROT_READ, MAP_SHARED, 3, 0) = 0x7f5541c99000
mincore(0x7f5541c99000, 139264, [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, ...]) = 0
munmap(0x7f5541c99000, 139264)          = 0
ioctl(3, EXT4_IOC_MOVE_EXT, 0x7ffd6bb8ac40) = -1 EBUSY (Device or resource
busy)
sync_file_range(3, 0, 139264,
SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE|SYNC_FILE_RANGE_WAIT_AFTER) =
0
fadvise64(3, 0, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 4096, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 8192, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 12288, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 16384, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 20480, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 24576, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 28672, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 32768, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 36864, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 40960, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 45056, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 49152, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 53248, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 57344, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 61440, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 65536, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 69632, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 73728, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 77824, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 81920, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 86016, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 90112, 4096, POSIX_FADV_DONTNEED) = 0
fadvise64(3, 94208, 4096, POSIX_FADV_DONTNEED) = 0
write(1, "\n", 1
)                       = 1
write(2, "\tFailed to defrag with EXT4_IOC_"..., 62     Failed to defrag with
EXT4_IOC_MOVE_EXT ioctl:Success   [ NG ]
) = 62
ioctl(3, FS_IOC_FIEMAP, {fm_start=0, fm_length=18446744073709551615,
fm_flags=FIEMAP_FLAG_SYNC, fm_extent_count=0} => {fm_flags=FIEMAP_FLAG_SYNC,
fm_mapped_extents=4, ...}) = 0



Device or resource busy? Why? Chrome is not open.

ps ax | grep -i chrome
 967139 pts/1    S+     0:00 grep --color=auto -i chrome


Online defragmentation in both 6.16 and 6.17 is broken.

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