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
