On Sun, 14 Feb 2016 13:32:24 -0800 Liu Bo <bo.li....@oracle.com> wrote:
> Hi Mike, > On Sun, Feb 14, 2016 at 12:23:16AM +0500, Михаил Гаврилов wrote: > > Sorry, I have not yet had time to apply your patch. > > > > And get hang again when launch web browser. > > > > Here new logs: > > http://btrfs.sy24.ru/kernel-sysrqw-btrfscleaner770blocked-3.txt > > The logs show, > every hung process is waiting for fs tree root's WRITE_LOCK, but someone who's > holding the WRITE_LOCK is not reflected here. > > Only one suspicious process is > "Chrome_FileThre D ffff8807fe1d7a18 10360 22486 2826 0x00000000" > it's also waiting on btrfs_tree_lock(), but I can't tell whether it > waits for the fs tree root node's lock or the children node's lock. > > Hmm, sorry for not being helpful, but I was wondering if this also > occurs on the latest btrfs(4.5) or is it possible to give it a shot? > > The best result is that it's been fixed by one commit in 4.5. FWIW I had a persistently repeating deadlock on 4.1 and 4.3, but after upgrade to 4.4 it no longer happens. Not sure if it might be related or not, the backtrace seems similar: http://www.spinics.net/lists/linux-btrfs/msg50951.html My advice would be to try 4.4, but don't forget to manually add the nocow/enospc patch: https://patchwork.kernel.org/patch/7967161/ None of the vanilla 4.1, 4.3 or 4.4 should be considered usable with Btrfs at the moment. The latest kernel series which works out of the box was 3.18; patched 4.4 also works fine so far, but I wonder if that patch makes it into 4.4.2 or gets forgotten/etc again. -- With respect, Roman
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