https://bugzilla.novell.com/show_bug.cgi?id=772075
https://bugzilla.novell.com/show_bug.cgi?id=772075#c2
--- Comment #2 from Adrian Schröter 2012-08-01 09:04:20 UTC ---
An strace on dmsetup shows that it hangs in semphore handling. So, that might
be a userland problem.
...
stat("/dev/mapper/control", {st_mode=S_IFCHR|0600, st_rdev=makedev(10, 236),
...}) = 0
open("/proc/devices", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f6fafc1c000
read(4, "Character devices:\n 1 mem\n 4 /"..., 1024) = 392
close(4) = 0
munmap(0x7f6fafc1c000, 4096) = 0
ioctl(3, DM_VERSION, 0xcb5380) = 0
stat("/dev/mapper/loop0p1", {st_mode=S_IFBLK|0660, st_rdev=makedev(253, 0),
...}) = 0
stat("/dev/mapper/loop0p1", {st_mode=S_IFBLK|0660, st_rdev=makedev(253, 0),
...}) = 0
semctl(0, 0, SEM_INFO, 0x7fff67b6c1d0) = 0
open("/etc/udev/udev.conf", O_RDONLY|O_CLOEXEC) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=44, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f6fafc1c000
read(4, "# see udev(7) for details\n\n#udev"..., 4096) = 44
read(4, "", 4096) = 0
close(4) = 0
munmap(0x7f6fafc1c000, 4096) = 0
open("/run/udev/queue.bin", O_RDONLY|O_CLOEXEC) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=8, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f6fafc1c000
read(4, "t\3\0\0\0\0\0\0", 4096) = 8
close(4) = 0
munmap(0x7f6fafc1c000, 4096) = 0
open("/dev/urandom", O_RDONLY) = 4
read(4, "@o", 2) = 2
semget(0xd4d6f40, 1, IPC_CREAT|IPC_EXCL|0600) = 0
semctl(0, 0, SETVAL, 0x1) = 0
close(4) = 0
semop(0, {{0, 1, 0}}, 1) = 0
ioctl(3, DM_DEV_REMOVE, 0xcb52d0) = 0
semget(0xd4d6f40, 1, 0) = 0
semop(0, {{0, -1, IPC_NOWAIT}}, 1) = 0
semop(0, {{0, 0, 0}}, 1
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