phenom / # mdadm --stop /dev/md2 mdadm: failed to stop array /dev/md2: Device or resource busy Perhaps a running process, mounted filesystem or active volume group? phenom / # lsof /dev/md2 phenom / # Reproducible: Always Steps to Reproduce: 1. unmount a raid0 array 2. try to stop array with mdadm 3. fail Actual Results: stop failed Expected Results: stopped unused array phenom / # emerge --info Portage 2.2_rc41 (unavailable, gcc-4.4.1, glibc-2.10.1-r0, 2.6.30-gentoo-r6 x86_64) ================================================================= System uname: Linux-2.6.30-gentoo-r6-x86_64-AMD_Phenom-tm-_II_X4_955_Processor-with-gentoo-2.0.1 Timestamp of tree: Unknown distcc 3.1 x86_64-pc-linux-gnu [disabled] dev-lang/python: 2.6.2-r1, 3.1.1 sys-devel/autoconf: 2.13, 2.63-r1 sys-devel/automake: 1.10.2, 1.11 sys-devel/binutils: 2.19.1-r1 sys-devel/libtool: 2.2.6a virtual/os-headers: 2.6.30-r1 ACCEPT_KEYWORDS="amd64 ~amd64" CFLAGS="-march=amdfam10 -O2 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/config" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/sandbox.d /etc/terminfo /etc/udev/rules.d" CXXFLAGS="-march=amdfam10 -O2 -pipe" DISTDIR="/usr/portage/distfiles" FEATURES="assume-digests distlocks fixpackages parallel-fetch preserve-libs protect-owned sandbox sfperms strict unmerge-logs unmerge-orphans user-sandbox userfetch userpriv" GENTOO_MIRRORS="http://gentoo.osuosl.org/" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/tmp/portage" PORTDIR_OVERLAY="/usr/local/portage/layman/sunrise" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="3dnow 3dnowext 64bit aften bash-completion blas caps chroot cleartype corefonts css divx djbfft erandom extrafilters faac faad ffmpeg git glib imagemagick kdehiddenvisibility kvm lvm lzma lzo md5sum-external mjpeg mmap mmx mmxext modules mp2 mpi mplayer mysql offensive opencore-amr pcap phonon plasma rar rdp sha512 shm sql sse sse2 sse3 sse4 sse4a subversion theora transcode upnp userlocales wav webdav webkit wma wmp" Unset: EMERGE_DEFAULT_OPTS
Not sure but it looks like mdadm might be opening the raid array before it actually tries to stop it. phenom / # strace mdadm --stop /dev/md2 execve("/sbin/mdadm", ["mdadm", "--stop", "/dev/md2"], [/* 35 vars */]) = 0 brk(0) = 0x1115000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0c57c61000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0c57c60000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=132129, ...}) = 0 mmap(NULL, 132129, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f0c57c3f000 close(3) = 0 open("/lib/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\353\1\0\0\0\0\0@"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1387696, ...}) = 0 mmap(NULL, 3495976, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f0c576f0000 mprotect(0x7f0c5783c000, 2097152, PROT_NONE) = 0 mmap(0x7f0c57a3c000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14c000) = 0x7f0c57a3c000 mmap(0x7f0c57a41000, 18472, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f0c57a41000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0c57c3e000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0c57c3d000 arch_prctl(ARCH_SET_FS, 0x7f0c57c3d6f0) = 0 mprotect(0x7f0c57a3c000, 16384, PROT_READ) = 0 mprotect(0x644000, 4096, PROT_READ) = 0 mprotect(0x7f0c57c62000, 4096, PROT_READ) = 0 munmap(0x7f0c57c3f000, 132129) = 0 getpid() = 10832 brk(0) = 0x1115000 brk(0x1136000) = 0x1136000 open("/etc/mdadm.conf", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=210, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0c57c5f000 read(3, "ARRAY /dev/md1 metadata=0.90 UUID"..., 4096) = 210 read(3, ""..., 4096) = 0 read(3, ""..., 4096) = 0 close(3) = 0 munmap(0x7f0c57c5f000, 4096) = 0 uname({sys="Linux", node="phenom", ...}) = 0 open("/dev/md2", O_RDWR) = 3 fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(9, 2), ...}) = 0 ioctl(3, 0x800c0910, 0x7fff8ab81670) = 0 fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(9, 2), ...}) = 0 ioctl(3, 0x800c0910, 0x7fff8ab81150) = 0 fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(9, 2), ...}) = 0 ioctl(3, 0x800c0910, 0x7fff8ab81150) = 0 fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(9, 2), ...}) = 0 ioctl(3, 0x800c0910, 0x7fff8ab80c60) = 0 fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(9, 2), ...}) = 0 open("/sys/block/md2/md/metadata_version", O_RDONLY) = 4 read(4, "0.90\n"..., 1024) = 5 close(4) = 0 open("/sys/block/md2/md/level", O_RDONLY) = 4 read(4, "raid0\n"..., 1024) = 6 close(4) = 0 ioctl(3, 0x932, 0) = -1 EBUSY (Device or resource busy) write(2, "mdadm: failed to stop array /dev/"..., 62mdadm: failed to stop array /dev/md2: Device or resource busy ) = 62 write(2, "Perhaps a running process, mounte"..., 70Perhaps a running process, mounted filesystem or active volume group? ) = 70 close(3) = 0 exit_group(1) = ?
Had a ghost bindmount going to the system where this raid was previously mounted. That was keeping md2 from stopping.
