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Groups > linux.kernel > #1500613
| From | Dave Jones <davej@codemonkey.org.uk> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: btrfs bio linked list corruption. |
| Date | 2016-10-14 00:30 +0200 |
| Message-ID | <srWFH-180-7@gated-at.bofh.it> (permalink) |
| References | (2 earlier) <srs4V-56s-3@gated-at.bofh.it> <srt10-5LT-21@gated-at.bofh.it> <srSLM-78p-27@gated-at.bofh.it> <srSLM-78p-25@gated-at.bofh.it> <srWFH-180-9@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Thu, Oct 13, 2016 at 05:18:46PM -0400, Chris Mason wrote: > > > > WARNING: CPU: 1 PID: 21706 at fs/btrfs/transaction.c:489 start_transaction+0x40a/0x440 [btrfs] > > > > CPU: 1 PID: 21706 Comm: trinity-c16 Not tainted 4.8.0-think+ #14 > > > > ffffc900019076a8 ffffffffb731ff3c 0000000000000000 0000000000000000 > > > > ffffc900019076e8 ffffffffb707a6c1 000001e9f5806ce0 ffff8804f74c4d98 > > > > 0000000000000801 ffff880501cfa2a8 000000000000008a 000000000000008a > > > > > > This isn't even IO. Uuughhhh. We're going to need a fast enough test > > > that we can bisect. > > > > Progress... > > I've found that this combination of syscalls.. > > > > ./trinity -C64 -q -l off -a64 --enable-fds=testfile -c fsync -c fsetxattr -c lremovexattr -c pwritev2 > > > > hits one of these two bugs in a few minutes runtime. > > > > Just the xattr syscalls + fsync isn't enough, neither is just pwrite + fsync. > > Mix them together though, and something goes awry. > > > > Hasn't triggered here yet. I'll leave it running though. With that combo of params I triggered it 3-4 times in a row within minutes.. Then as soon as I posted, it stopped being so easy to repro. There's some other variable I haven't figured out yet (maybe how the random way that files get opened in fds/testfiles.c), but it does seem to point at the xattr changes. I'll poke at it some more tomorrow. Dave
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Re: btrfs bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-13 20:20 +0200 Re: btrfs bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-14 00:30 +0200 Re: btrfs bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-16 02:50 +0200
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