[Pkg-samba-maint] Bug#461048: smbfs: "This utility only unmounts cifs filesystems"

[Paolo]

On Wed, Jan 16, 2008 at 07:27:07PM -0800, Steve Langasek wrote:
...
> On Wed, Jan 16, 2008 at 05:18:16PM +0100, Paolo wrote:
> > hm, seems the problem is in 
> 
> >   mount: mount-2.12r
> 
> > as it sees the mentioned cifs mounted volume whereas there is none 
> > (/proc/mounts did not list it).
> 
> >From your description, this sounds like a bug that was fixed in the upload
> of 3.0.25b-2:
> 
>   * cifs-umount-trailing-slashes.patch: canonicalize mount point names when
>     umount.cifs is called, to avoid unnecessarily leaving entries behind in
>     /etc/mtab if invoked with a trailing slash in the mount point name

sounds close indeed, though I did not use a trailing '/'.

> Does it hang before or after the point that the share is unmounted?  (Can be
> checked from another console using cat /proc/mounts)

after. BTW, 'ps x' shows:

20192 ?        D      0:00   /sbin/umount.cifs /home/user/share

> Can you send strace output of this unmount attempt?  After you hit CTRL-C,

attached

> does /etc/mtab get updated, or does the unmount command terminate
> immediately?

seems the latter: num.lines keep growing with mount/umount cycles.
 
> > Not smbfs-related, after all; should be reassigned to pkg mount - sorry 
> > for the noise. 
> 
> Disagree, I think this entirely an smbfs bug.

yep, partly agree here: turns out there's something wrong with umount.cifs 
indeed, though [u]mount(8) is fooled by mtab while it should dbl-check
with a more reliable 


thanks

-- 
 paolo
 
 GPG/PGP id:0x1D5A11A4  - 04FC 8EB9 51A1 5158 1425  BC12 EA57 3382 1D5A 11A4
 - 9/11: the outrageous deception and ongoing coverup: http://911review.org -
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stat64("/sbin/umount.cifs", {st_mode=S_IFREG|S_ISUID|0755, st_size=8888, ...}) = 0
clone(Process 20698 attached (waiting for parent)
Process 20698 resumed (parent 20697 ready)
child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb7d9a9e8) = 20698
[pid 20697] wait4(-1, Process 20697 suspended
 <unfinished ...>
[pid 20698] getgid32()                  = 0
[pid 20698] setgid32(0)                 = 0
[pid 20698] getuid32()                  = 0
[pid 20698] setuid32(0)                 = 0
[pid 20698] execve("/sbin/umount.cifs", ["/sbin/umount.cifs", "/home/user/share", "-f"], [/* 12 vars */]) = 0
[pid 20698] uname({sys="Linux", node="sari", ...}) = 0
[pid 20698] brk(0)                      = 0x804b000
[pid 20698] access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
[pid 20698] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f97000
[pid 20698] access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
[pid 20698] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f96000
[pid 20698] open("/etc/ld.so.cache", O_RDONLY) = 3
[pid 20698] fstat64(3, {st_mode=S_IFREG|0644, st_size=100247, ...}) = 0
[pid 20698] mmap2(NULL, 100247, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f7d000
[pid 20698] close(3)                    = 0
[pid 20698] access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
[pid 20698] open("/lib/tls/i686/cmov/libc.so.6", O_RDONLY) = 3
[pid 20698] read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\240O\1"..., 512) = 512
[pid 20698] fstat64(3, {st_mode=S_IFREG|0644, st_size=1241392, ...}) = 0
[pid 20698] mmap2(NULL, 1247388, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb7e4c000
[pid 20698] mmap2(0xb7f73000, 28672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x127) = 0xb7f73000
[pid 20698] mmap2(0xb7f7a000, 10396, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7f7a000
[pid 20698] close(3)                    = 0
[pid 20698] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7e4b000
[pid 20698] mprotect(0xb7f73000, 20480, PROT_READ) = 0
[pid 20698] set_thread_area({entry_number:-1 -> 6, base_addr:0xb7e4b6c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
[pid 20698] munmap(0xb7f7d000, 100247)  = 0
[pid 20698] geteuid32()                 = 0
[pid 20698] statfs64("/home/user/share", 84, {f_type=0xff534d42, f_bsize=1024, f_blocks=16342484, f_bfree=7757104, f_bavail=7757104, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=4096, f_frsize=1024}) = 0
[pid 20698] getuid32()                  = 0
[pid 20698] umount("/home/user/share", MNT_FORCE