On Tue, May 10, 2016 at 06:19:20PM -0500, Eric Biggers wrote: > Hello, > > The following warning has been triggering for me since about v4.6-rc3: > > WARN_ON(BTRFS_I(inode)->csum_bytes); > > On one machine the warning has occurred 657 times since v4.6-rc5. On another > it > has occurred 3 times since v4.6-rc3. Both are now on v4.6-rc7, where I have > still observed the warning. The warnings occur in groups, and do_unlinkat() > and > evict() are always in the call stack. > > Is this a known issue? Here is the first occurrence:
Finally tracked this down today, it's a bug in how we deal with page faults in the middle of a write. We're testing the fix here and I'll have a patch on Monday. Strictly speaking this is a regression in one of Chandan's setup patches for PAGE_SIZE > sectorsize, but the code was much much too subtle to blame him. It should be possible to trigger with a non-aligned multi-page write, I'm trying to nail down a reliable test program so we don't make the same mistake again. -chris -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
