On Thu, Jan 18, 2018 at 05:07:50PM +0100, David Sterba wrote: > On Wed, Jan 17, 2018 at 12:20:24PM -0800, Matthew Wilcox wrote: > > From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx> > > > > This version of the XArray has no known bugs. > > I've booted this patchset on 2 boxes, both had random problems during > boot. On one I was not able to diagnose what went wrong. On the other > one the system booted up to userspace and failed to set up networking. > Serial console worked and the network service complained about wrong > format of /usr/share/wicked/schema/team.xml . That's supposed to be a > text file, though hexdump showed me lots of zeros. Trimmed output: > > 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| > * > (similar output here) > * > 00000a10 00 00 00 00 00 00 00 00 11 03 00 00 00 00 00 00 |................| > 00000a20 20 8b 7f 01 00 00 00 00 a0 84 7d 01 00 00 00 00 | .........}.....| > 00000a30 00 00 00 00 00 00 00 00 10 89 7f 01 00 00 00 00 |................| > 00000a40 a0 84 7d 01 00 00 00 00 00 00 00 00 00 00 00 00 |..}.............| > 00000a50 80 8a 7f 01 00 00 00 00 e0 cf 7d 01 00 00 00 00 |..........}.....| > 00000a60 00 00 00 00 00 00 00 00 60 8a 7f 01 00 00 00 00 |........`.......| > 00000a70 a0 84 7d 01 00 00 00 00 00 00 00 00 00 00 00 00 |..}.............| > 00000a80 30 89 7f 01 00 00 00 00 a0 84 7d 01 00 00 00 00 |0.........}.....| > 00000a90 00 00 00 00 00 00 00 00 60 f2 7f 01 00 00 00 00 |........`.......| > 00000aa0 40 fd 7e 01 00 00 00 00 00 00 00 00 00 00 00 00 |@.~.............| > 00000ab0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| > * > 00001000 3e 0a 20 20 3c 2f 6d 65 74 68 6f 64 3e 0a 3c 2f |>. </method>.</| > 00001010 73 65 72 76 69 63 65 3e 0a |service>.| > > There's something at the end of the file that does look like a xml fragment. > The file size is 4121. This looks to me like exactly the first page of the file > was not read correctly. > > The xml file is supposed to be read-only during startup, so there was no write > in flight. 'rpm -Vv' reported only this file corrupted. Booting to other > kernels was fine, network up, and the file was ok again. So the > corruption happened only in memory, which leads me to conclusion that > there is an unknown bug in your patchset. Thank you! I shall attempt to debug. Was this with a btrfs root filesystem? I'm most suspicious of those patches right now, since they've received next to no testing. I'm going to put together a smaller patchset which just does the page cache conversion and nothing else in the hope that we can get that merged this year.
