GNU bug report logs - #10442
maybe a bug for "tail"

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: yukuan <yukuan <at> huawei.com>
To: "bug-coreutils <at> gnu.org" <bug-coreutils <at> gnu.org>
Subject: maybe a bug for "tail"
Date: Fri, 06 Jan 2012 07:27:42 +0000

[Message part 1 (text/plain, inline)]

When I user "tail -f FILENAME" to follow a file, which is continually growing, the output sometimes stops. When I press ctrl-c to quit and right immediately follow the same file, output would continue. And I found the file is growing while the output stops.
(BTW, it's a log file with timestamp, so I am sure the file is growing. And while writing this mail, the file in another window stops, again.)
Maybe it is a bug, or not. Please explain this for me.
Thanks!

[Message part 2 (text/html, inline)]

Message #8 received at 10442 <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: yukuan <yukuan <at> huawei.com>
Cc: 10442 <at> debbugs.gnu.org
Subject: Re: bug#10442: maybe a bug for "tail"
Date: Fri, 06 Jan 2012 10:20:52 +0000

On 01/06/2012 07:27 AM, yukuan wrote:
> When I user "tail -f FILENAME" to follow a file, which is continually growing, the output sometimes stops. When I press ctrl-c to quit and right immediately follow the same file, output would continue. And I found the file is growing while the output stops.
> (BTW, it's a log file with timestamp, so I am sure the file is growing. And while writing this mail, the file in another window stops, again.)
> Maybe it is a bug, or not. Please explain this for me.
> Thanks!
> 

What version of tail?
What file system is the log file on (is it remote for example)?
What kernel version?
Does it work with the undocumented ---disable-inotify option?

cheers,
Pádraig.

Message #11 received at 10442 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: yukuan <yukuan <at> huawei.com>
Cc: 10442 <at> debbugs.gnu.org
Subject: Re: bug#10442: maybe a bug for "tail"
Date: Fri, 06 Jan 2012 11:58:07 +0100

yukuan <yukuan <at> huawei.com> writes:

> When I user "tail -f FILENAME" to follow a file, which is continually growing, the output sometimes stops. When I press ctrl-c to quit and right immediately follow the same file, output would continue. And I found the file is growing while the output stops.

Does it also happen if you use "tail -F"?

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Message #16 received at 10442-done <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: 10442-done <at> debbugs.gnu.org, yukuan <yukuan <at> huawei.com>
Subject: Re: bug#10442: maybe a bug for "tail"
Date: Mon, 09 Jan 2012 09:49:29 +0000

tags 10442 notabug

On 01/06/2012 10:58 AM, Andreas Schwab wrote:
> yukuan <yukuan <at> huawei.com> writes:
> 
>> When I user "tail -f FILENAME" to follow a file, which is continually growing, the output sometimes stops. When I press ctrl-c to quit and right immediately follow the same file, output would continue. And I found the file is growing while the output stops.
> 
> Does it also happen if you use "tail -F"?

In private mails, the user confirmed that
the file is being renamed, and thus -F is required.

cheers,
Pádraig.

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