linux-kernel - Re: [GIT PULL] Btrfs

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Message-ID: <pan$d33a5$fc604a73$666289c2$1a5e803f@cox.net>
Date:	Mon, 21 Jul 2014 03:07:06 +0000 (UTC)
From:	Duncan <1i5t5.duncan@....net>
To:	linux-kernel@...r.kernel.org
Cc:	linux-btrfs@...r.kernel.org
Subject: Re: [GIT PULL] Btrfs

Chris Mason posted on Sun, 20 Jul 2014 10:33:24 -0400 as excerpted:

> I was hoping to also include a fix for a btrfs deadlock with compression
> enabled, but we're still nailing that one down.

FWIW, I might be (rarely but twice, now) hitting that one myself, 
compress=lzo, but /not/ with the rsync that has been your current primary 
trigger.

The last time I hit it, it was trying to start firefox shortly after a 
fresh boot.  Firefox didn't come up, and when I tried starting it again, 
I got the dialog saying it was already running, quit the running instance 
and try again, or reboot.

But the running firefox instance was stuck unkillable in D state, with a 
zombie child.  Three of my six cores were stuck in 100% IO-wait.

I finished what I was doing and shut down X, but of course the D-state 
and zombie firefox reparented to systemd.  The time before when that 
happened with firefox, I ended up losing several of the firefox state 
files and it forgot my extensions, which I had to restore from backup.  
So this time I mounted a reiserfs I use for other things and did a backup 
of the entire ~/.mozilla/ subdir before finishing the shutdown and 
reboot.  That backup went fine (surprised me, I thought it might hang 
too), and I umounted the reiserfs.  But when I went to finish the 
shutdown of course the affected btrfs wouldn't umount due to the stuck 
firefox.  So I did the magic-SRQ REISUB thing, and saw the emergency sync 
and the remount-read-only complete.

After that I force-rebooted.  Luckily, this time I didn't need that 
backup of the ~/.mozilla subfolder I had made -- firefox came up fine 
after the reboot.  But I did lose the read state on a few messages in my 
feed (rss/atom) and news (nntp) readers, so I think btrfs did lose the 
log from after the last root-tree commit point.

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

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