Hi all It needs to use the latest upstream mdadm https://github.com/md-raid-utilities/mdadm/ which has fixed this problem. And for fedora, it hasn't updated to the latest upstream. So it has this problem. I'll update fedora mdadm to latest upstream. Best Regards Xiao On Wed, Aug 6, 2025 at 11:28 PM Mikulas Patocka <mpatocka@xxxxxxxxxx> wrote: > > Hi > > I report that the commit 9e59d609763f70a992a8f3808dabcce60f14eb5c causes > problem with this mdadm script: > > modprobe brd rd_size=1048576 > mdadm --create /dev/md/mdmirror --name mdmirror --uuid aaaaaaaa:bbbbbbbb:cccccccc:00000001 /dev/ram0 /dev/ram1 -v -f --level=1 --raid-devices=2 > mdadm -v --stop /dev/md/mdmirror > mdadm --assemble /dev/md/mdmirror --name mdmirror -v > > Prior to this commit, the last command successfully assembles the array. > After this commit, it reports an error "mdadm: Unable to initialize > sysfs". > > See https://bugzilla.redhat.com/show_bug.cgi?id=2385871 > > This is the strace of the failed mdadm --assemble command: > > mknodat(AT_FDCWD, "/dev/.tmp.md.2512:9:127", S_IFBLK|0600, makedev(0x9, 0x7f)) = 0 > openat(AT_FDCWD, "/dev/.tmp.md.2512:9:127", O_RDWR|O_EXCL|O_DIRECT) = 4 > unlink("/dev/.tmp.md.2512:9:127") = 0 > fstat(4, {st_mode=S_IFBLK|0600, st_rdev=makedev(0x9, 0x7f), ...}) = 0 > readlink("/sys/dev/block/9:127", "../../devices/virtual/block/md12"..., 199) = 33 > openat(AT_FDCWD, "/proc/mdstat", O_RDONLY) = 5 > fcntl(5, F_SETFD, FD_CLOEXEC) = 0 > fstat(5, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 > read(5, "Personalities : [raid1] \nunused "..., 1024) = 48 > read(5, "", 1024) = 0 > close(5) = 0 > ioctl(4, STOP_ARRAY, 0) = 0 > openat(AT_FDCWD, "/dev/ram1", O_RDWR|O_EXCL|O_DIRECT) = 5 > ioctl(5, BLKSSZGET, [512]) = 0 > fstat(5, {st_mode=S_IFBLK|0660, st_rdev=makedev(0x1, 0x1), ...}) = 0 > ioctl(5, BLKGETSIZE64, [1073741824]) = 0 > lseek(5, 4096, SEEK_SET) = 4096 > read(5, "\374N+\251\1\0\0\0\0\0\0\0\0\0\0\0\252\252\252\252\273\273\273\273\314\314\314\314\0\0\0\1"..., 4096) = 4096 > lseek(5, 0, SEEK_CUR) = 8192 > fstat(5, {st_mode=S_IFBLK|0660, st_rdev=makedev(0x1, 0x1), ...}) = 0 > close(5) = 0 > write(2, "mdadm: /dev/ram1 is identified a"..., 72) = 72 > openat(AT_FDCWD, "/dev/ram0", O_RDWR|O_EXCL|O_DIRECT) = 5 > ioctl(5, BLKSSZGET, [512]) = 0 > fstat(5, {st_mode=S_IFBLK|0660, st_rdev=makedev(0x1, 0), ...}) = 0 > ioctl(5, BLKGETSIZE64, [1073741824]) = 0 > lseek(5, 4096, SEEK_SET) = 4096 > read(5, "\374N+\251\1\0\0\0\0\0\0\0\0\0\0\0\252\252\252\252\273\273\273\273\314\314\314\314\0\0\0\1"..., 4096) = 4096 > lseek(5, 0, SEEK_CUR) = 8192 > fstat(5, {st_mode=S_IFBLK|0660, st_rdev=makedev(0x1, 0), ...}) = 0 > close(5) = 0 > write(2, "mdadm: /dev/ram0 is identified a"..., 72) = 72 > openat(AT_FDCWD, "/dev/ram0", O_RDONLY|O_EXCL|O_DIRECT) = 5 > ioctl(5, BLKSSZGET, [512]) = 0 > fstat(5, {st_mode=S_IFBLK|0660, st_rdev=makedev(0x1, 0), ...}) = 0 > ioctl(5, BLKGETSIZE64, [1073741824]) = 0 > lseek(5, 4096, SEEK_SET) = 4096 > read(5, "\374N+\251\1\0\0\0\0\0\0\0\0\0\0\0\252\252\252\252\273\273\273\273\314\314\314\314\0\0\0\1"..., 4096) = 4096 > lseek(5, 0, SEEK_CUR) = 8192 > close(5) = 0 > fstat(4, {st_mode=S_IFBLK|0600, st_rdev=makedev(0x9, 0x7f), ...}) = 0 > readlink("/sys/dev/block/9:127", 0x7ffcd3ed18b0, 199) = -1 ENOENT (Adresář nebo soubor neexistuje) !!! FAILURE !!! > newfstatat(AT_FDCWD, "/sys/block/md127/md", 0x7ffcd3ed1a30, 0) = -1 ENOENT (Adresář nebo soubor neexistuje) > write(2, "mdadm: Unable to initialize sysf"..., 34) = 34 > unlink("/run/mdadm/map.lock") = 0 > close(3) = 0 > close(4) = 0 > exit_group(1) = ? > > See the line that is marked "!!! FAILURE !!!". Prior to the commit > 9e59d609763f70a992a8f3808dabcce60f14eb5c, mdadm is able to read the > /sys/dev/block/9:127 symlink. > > Mikulas
