[lxc-devel] LXC container fails to start by complaining that it is unable to unmount the old pivot-root
Ciprian Dorin, Craciun
ciprian.craciun at gmail.com
Mon Feb 1 17:46:04 UTC 2010
Hello all!
I have a quite strange problem: the container fails to start and
complains about being unable to unmount the old pivot root.
(What is strange is that I remember that one moth ago the same
setup worked (lxc binaries and config file, but maybe 2.6.31 kernel).
Now neither the old binaries or the latest ones from Git don't work.)
I also put below the config (lxc.conf) file:
~~~~
lxc.utsname = lxc-test
lxc.rootfs = /tmp/lxc-test
lxc.mount = /dev/null
~~~~
The command used (the `container` command `busybox` is wrong, but
it doesn't even execute it; and I know that I should use something
behaving like init as a command):
~~~~
./lxc-start --name lxc-test --rcfile ./lxc.conf ./busybox
~~~~
Could some one help me?
Thanks,
Ciprian.
And the `strace -f` output:
~~~~
execve("./lxc-start", ["./lxc-start", "--name", "lxc-test",
"--rcfile", "./lxc.conf", "./busybox"], [/* 17 vars */]) = 0
uname({sys="Linux", node="erebus", ...}) = 0
brk(0) = 0x9ba2000
brk(0x9ba2cd0) = 0x9ba2cd0
set_thread_area({entry_number:-1 -> 6, base_addr:0x9ba2830,
limit:1048575, seg_32bit:1, contents:0, read_exec_only:0,
limit_in_pages:1, seg_not_present:0, useable:1}) = 0
brk(0x9bc3cd0) = 0x9bc3cd0
brk(0x9bc4000) = 0x9bc4000
open("/proc/self/fd", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = 3
fcntl64(3, F_GETFD) = 0x1 (flags FD_CLOEXEC)
getdents(3, /* 6 entries */, 32768) = 96
getdents(3, /* 0 entries */, 32768) = 0
close(3) = 0
open("./lxc.conf", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0600, st_size=72, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb78d9000
read(3, "lxc.utsname = lxc-test\nlxc.rootf"..., 4096) = 72
read(3, "", 4096) = 0
close(3) = 0
munmap(0xb78d9000, 4096) = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
socket(PF_FILE, SOCK_DGRAM, 0) = 3
sendto(3, "\0\0\0\0lxc-test\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
4104, 0, {sa_family=AF_FILE, path=@"lxc-monitor"}, 110) = -1
ECONNREFUSED (Connection refused)
close(3) = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
readlink("/proc/self/fd/0", "/dev/pts/2", 4095) = 10
rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
signalfd4(-1, [CHLD], 8, 0) = 3
fcntl64(3, F_SETFD, FD_CLOEXEC) = 0
rt_sigaction(SIGINT, {0x8049130, ~[RTMIN RT_1], SA_SIGINFO}, {SIG_DFL,
[], 0}, 8) = 0
rt_sigaction(SIGQUIT, {0x8049170, ~[RTMIN RT_1], SA_SIGINFO},
{SIG_DFL, [], 0}, 8) = 0
socketpair(PF_FILE, SOCK_STREAM, 0, [4, 5]) = 0
clone(Process 25320 attached (waiting for parent)
Process 25320 resumed (parent 25319 ready)
child_stack=0xbfca71b4, flags=CLONE_NEWNS|0x2c000000|SIGCHLD) = 25320
[pid 25320] getpid( <unfinished ...>
[pid 25319] close(4 <unfinished ...>
[pid 25320] <... getpid resumed> ) = 1
[pid 25319] <... close resumed> ) = 0
[pid 25320] rt_sigprocmask(SIG_SETMASK, [], <unfinished ...>
[pid 25319] read(5, <unfinished ...>
[pid 25320] <... rt_sigprocmask resumed> NULL, 8) = 0
[pid 25320] close(5) = 0
[pid 25320] fcntl64(4, F_SETFD, FD_CLOEXEC) = 0
[pid 25320] write(4, "\310q\312\277", 4) = 4
[pid 25319] <... read resumed> "\310q\312\277", 4) = 4
[pid 25320] read(4, <unfinished ...>
[pid 25319] open("/etc/mtab", O_RDONLY) = 4
[pid 25319] fstat64(4, {st_mode=S_IFREG|0644, st_size=1539, ...}) = 0
[pid 25319] mmap2(NULL, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb78d9000
[pid 25319] read(4, "/dev/sda4 / jfs rw,relatime,erro"..., 4096) = 1539
[pid 25319] read(4, "", 4096) = 0
[pid 25319] close(4) = 0
[pid 25319] munmap(0xb78d9000, 4096) = 0
[pid 25319] access("/mnt/cgroup/lxc-test", F_OK) = -1 ENOENT (No such
file or directory)
[pid 25319] rename("/mnt/cgroup/25320", "/mnt/cgroup/lxc-test") = 0
[pid 25319] write(5, "\310q\312\277", 4) = 4
[pid 25320] <... read resumed> "\310q\312\277", 4) = 4
[pid 25319] read(5, <unfinished ...>
[pid 25320] sethostname("lxc-test", 8) = 0
[pid 25320] open("/dev/null", O_RDONLY) = 5
[pid 25320] fstat64(5, {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 3), ...}) = 0
[pid 25320] ioctl(5, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbfca69c8) = -1
ENOTTY (Inappropriate ioctl for device)
[pid 25320] mmap2(NULL, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb78d9000
[pid 25320] read(5, "", 4096) = 0
[pid 25320] close(5) = 0
[pid 25320] munmap(0xb78d9000, 4096) = 0
[pid 25320] stat64("/tmp", {st_mode=S_IFDIR|S_ISVTX|0777,
st_size=1160, ...}) = 0
[pid 25320] gettimeofday({1265046041, 620159}, NULL) = 0
[pid 25320] open("/tmp/tmpfLf4tiB", O_RDWR|O_CREAT|O_EXCL, 0600) = 5
[pid 25320] unlink("/tmp/tmpfLf4tiB") = 0
[pid 25320] fcntl64(5, F_GETFL) = 0x2 (flags O_RDWR)
[pid 25320] fstat64(5, {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
[pid 25320] mmap2(NULL, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb78d9000
[pid 25320] _llseek(5, 0, [0], SEEK_CUR) = 0
[pid 25320] _llseek(5, 0, [0], SEEK_SET) = 0
[pid 25320] read(5, "", 4096) = 0
[pid 25320] close(5) = 0
[pid 25320] munmap(0xb78d9000, 4096) = 0
[pid 25320] access("/tmp/lxc-test/dev/console", R_OK|W_OK) = 0
[pid 25320] mount("/dev/pts/2", "/tmp/lxc-test/dev/console",
0x80c3ac2, MS_BIND, NULL) = 0
[pid 25320] stat64("/tmp", {st_mode=S_IFDIR|S_ISVTX|0777,
st_size=1160, ...}) = 0
[pid 25320] lstat64("/tmp/lxc-rO81F7k", 0xbfca5fd4) = -1 ENOENT (No
such file or directory)
[pid 25320] mkdir("/tmp/lxc-rO81F7k", 0700) = 0
[pid 25320] mount("/tmp/lxc-test", "/tmp/lxc-rO81F7k", 0x80c3ac2,
MS_BIND|MS_REC, NULL) = 0
[pid 25320] chdir("/tmp/lxc-rO81F7k") = 0
[pid 25320] mkdir("./lxc-oldrootfs-f0F3W4", 0700) = 0
[pid 25320] pivot_root(".", "./lxc-oldrootfs-f0F3W4") = 0
[pid 25320] chdir("/") = 0
[pid 25320] open("//lxc-oldrootfs-f0F3W4/proc/mounts", O_RDONLY) = 5
[pid 25320] fstat64(5, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
[pid 25320] mmap2(NULL, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb78d9000
[pid 25320] read(5, "rootfs / rootfs rw 0 0\n/dev/root"..., 1024) = 1024
[pid 25320] read(5, "d,nodev,relatime,size=1048576k,n"..., 1024) = 1024
[pid 25320] read(5, " devpts rw,relatime,mode=600,ptm"..., 1024) = 182
[pid 25320] read(5, "", 1024) = 0
[pid 25320] close(5) = 0
[pid 25320] munmap(0xb78d9000, 4096) = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/dev") = -1 EBUSY (Device
or resource busy)
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/dev/pts") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/dev/shm") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/proc") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/sys") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/mnt/cgroup") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/boot") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/stores/archlinux") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/stores/erebus-1") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/lib/modules") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/var") = -1 EBUSY (Device
or resource busy)
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/var/run") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/var/tmp") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/usr") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/tmp") = -1 EBUSY (Device
or resource busy)
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/tmp/pacman-packages/vtun--3.0.1--1/rootfs/.workbench/cache/makepkg-pkg")
= 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/tmp/pacman-packages/vtun--3.0.1--1/rootfs/.workbench/cache/makepkg-src")
= 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/tmp/pacman-packages/vtun--3.0.1--1/rootfs/.workbench/tools/pacman/pacman-pkg")
= 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/tmp/pacman-packages/vtun--3.0.1--1/rootfs/.workbench/cache/pacman-mirrors")
= 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/tmp/lxc-test/dev/console") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/dev") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/var") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4/tmp") = 0
[pid 25320] oldumount("/lxc-oldrootfs-f0F3W4") = -1 EBUSY (Device or
resource busy)
[pid 25320] gettimeofday({1265046041, 629159}, NULL) = 0
[pid 25320] write(2, "lxc-start: ", 11lxc-start: ) = 11
[pid 25320] write(2, "Device or resource busy - could "..., 54Device
or resource busy - could not unmount old rootfs) = 54
[pid 25320] write(2, "\n", 1
) = 1
[pid 25320] gettimeofday({1265046041, 629763}, NULL) = 0
[pid 25320] write(2, "lxc-start: ", 11lxc-start: ) = 11
[pid 25320] write(2, "failed to pivot_root to '/tmp/lx"..., 39failed
to pivot_root to '/tmp/lxc-test') = 39
[pid 25320] write(2, "\n", 1
) = 1
[pid 25320] rmdir("/tmp/lxc-rO81F7k") = -1 ENOENT (No such file or directory)
[pid 25320] gettimeofday({1265046041, 630506}, NULL) = 0
[pid 25320] write(2, "lxc-start: ", 11lxc-start: ) = 11
[pid 25320] write(2, "failed to set rootfs for 'lxc-te"..., 35failed
to set rootfs for 'lxc-test') = 35
[pid 25320] write(2, "\n", 1
) = 1
[pid 25320] gettimeofday({1265046041, 631000}, NULL) = 0
[pid 25320] write(2, "lxc-start: ", 11lxc-start: ) = 11
[pid 25320] write(2, "failed to setup the container", 29failed to
setup the container) = 29
[pid 25320] write(2, "\n", 1
) = 1
[pid 25320] write(4, "\377\377\377\377", 4) = 4
[pid 25319] <... read resumed> "\377\377\377\377", 4) = 4
[pid 25320] _exit(-1) = ?
Process 25320 detached
socket(PF_FILE, SOCK_DGRAM, 0) = 4
sendto(4, "\0\0\0\0lxc-test\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
4104, 0, {sa_family=AF_FILE, path=@"lxc-monitor"}, 110) = -1
ECONNREFUSED (Connection refused)
close(4) = 0
close(4) = -1 EBADF (Bad file descriptor)
close(5) = 0
ioctl(2, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbfca71ac) = -1 ENOTTY
(Inappropriate ioctl for device)
close(2) = 0
close(1) = 0
close(0) = 0
epoll_create(2) = 0
epoll_ctl(0, EPOLL_CTL_ADD, 3, {EPOLLIN, {u32=163200968,
u64=577926083638869960}}) = 0
socket(PF_FILE, SOCK_STREAM, 0) = 1
bind(1, {sa_family=AF_FILE,
path=@"/usr/local/var/lib/lxc/lxc-test/command"}, 110) = 0
listen(1, 100) = 0
epoll_ctl(0, EPOLL_CTL_ADD, 1, {EPOLLIN, {u32=163201000, u64=163201000}}) = 0
epoll_wait(0, {{EPOLLIN, {u32=163200968, u64=577926083638869960}}}, 10, -1) = 1
waitpid(25320, [{WIFEXITED(s) && WEXITSTATUS(s) == 255}], 0) = 25320
socket(PF_FILE, SOCK_DGRAM, 0) = 2
sendto(2, "\0\0\0\0lxc-test\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
4104, 0, {sa_family=AF_FILE, path=@"lxc-monitor"}, 110) = -1
ECONNREFUSED (Connection refused)
close(2) = 0
socket(PF_FILE, SOCK_DGRAM, 0) = 2
sendto(2, "\0\0\0\0lxc-test\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
4104, 0, {sa_family=AF_FILE, path=@"lxc-monitor"}, 110) = -1
ECONNREFUSED (Connection refused)
close(2) = 0
open("/etc/mtab", O_RDONLY) = 2
fstat64(2, {st_mode=S_IFREG|0644, st_size=1539, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb78d9000
read(2, "/dev/sda4 / jfs rw,relatime,erro"..., 4096) = 1539
read(2, "", 4096) = 0
close(2) = 0
munmap(0xb78d9000, 4096) = 0
rmdir("/mnt/cgroup/lxc-test") = 0
rt_sigaction(SIGQUIT, {SIG_DFL, [], 0}, NULL, 8) = 0
rt_sigaction(SIGINT, {SIG_DFL, [], 0}, NULL, 8) = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbfca725c) = -1 ENOTTY
(Inappropriate ioctl for device)
exit_group(255) = ?
~~~~
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