I just pushed a change
<https://github.com/backuppc/backuppc/commit/b0ae4bca583b7882ce1c51f20391b681440a63c6>
to git to make the SMB pipe non-blocking, which is the same change I made
to Tar.pm in 4.1.3 to fix a stall issue with tar reported by Matt Bedynek.
Here's a diff that you could apply with patch:
https://github.com/backuppc/backuppc/commit/b0ae4bca583b7882ce1c51f20391b681440a63c6.diff
.
This might fix Dan's instance of the problem.
However, the log file that Tim sent shows that something else is going
wrong with his setup - smbclient is still running (doing something), but
BackupPC_tarExtract sees no further output. Could Micheal's theory be
correct - smbclient is repeatedly trying to read a dll? Unfortunately, I'm
not familiar with windows or SMB.
Tim - you could test standalone (without BackupPC involved) by running
something like:
/usr/bin/smbclient '\\pelican\C$' -U backup -E -d 1 -c tarmode full -Tc – |
tar tvf -
and waiting until either it completes, or it is stalled with no output from
tar. You could then re-run with higher debug levels on smbclient (increase
the "-d 1" to "-d 3" or so).
Craig
On Thu, Jul 20, 2017 at 8:10 PM, Michael Stowe <[email protected]>
wrote:
> On 2017-07-20 20:13, Tim Evans wrote:
>
> On 07/17/2017 12:21 AM, Craig Barratt wrote:
>
> When the tar backup appears to be stalled, please do the following:
>
> OK, full backup has been running since 11pm last night, and appears hung.
>
> * run ps auxww (options might vary based on which server OS you are
> running), and find the relevant backups processes: BackupPC_dump,
> BackupPC_tarExtract, and the corresponding ssh command that runs
> the
> remote tar.
>
> backuppc 19250 10.4 0.0 397252 15676 ? S Jul19 137:52 /usr/bin/smbclient
> \\pelican\C$ -U backup -E -d 1 -c tarmode full -Tc –
>
>
> -
>
> run “strace -p PID” as root, for each number PID listed by ps above.
> Please send me the output.
>
> strace -p 19250 (smbclient) never stops output, accumulates rapidly; some
> of it is attached.
>
> backuppc 19249 19246 8 Jul19 ? 01:51:40 /usr/bin/perl
> /usr/share/BackupPC/bin/BackupPC_tarExtract -h pelican -s C$ -f
>
> strace -p 19249 (tar) generates no output at all:
>
> # cat strace_tar.out read(0, <detached …>
>
> Xferlog's last modification date is 9:02am (about 12 hours ago and about
> 10 hours since the backup began). Last couple of lines are:
>
> same 644 0/0 11104
>
> Windows/winsxs/x86_netfx-sbs_wminet_utils_dll_31bf3856ad364e35_6.1.7600.
> 16385_none_007147dce7111012/sbs_wminet_utils.dll
>
> same 755 0/0 0
>
> Windows/winsxs/x86_netfx-sbs_wminet_utils_dll_31bf3856ad364e35_6.1.7601.
> 18514_none_02a244dce
>
> There is no line break here on the last line.
>
> It looks like you're backing up files from Windows' side-by-side folder,
> which means that a running program or service could be problematic for
> CIFS/SMB, causing it to hang until the program releases all copies of the
> DLL — in practical terms, until the program or service is stopped.
>
> Have you checked to make sure nothing is running?
>
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