On Tue, Feb 07, 2017 at 07:30:54PM +0900, Tetsuo Handa wrote: > Brian Foster wrote: > > > The workload is to write to a single file on XFS from 10 processes demonstrated at > > > http://lkml.kernel.org/r/201512052133.IAE00551.LSOQFtMFFVOHOJ@xxxxxxxxxxxxxxxxxxx > > > using "while :; do ./oom-write; done" loop on a VM with 4CPUs / 2048MB RAM. > > > With this XFS_FILBLKS_MIN() change applied, I no longer hit assertion failures. > > > > > > > Thanks for testing. Well, that's an interesting workload. I couldn't > > reproduce on a few quick tries in a similarly configured vm. > > It takes 10 to 15 minutes. Maybe some size threshold involved? > > > /tmp/file _is_ on an XFS filesystem in your test, correct? If so and if > > you still have the output file from a test that reproduced, could you > > get the 'xfs_io -c "fiemap -v" <file>' output? > > Here it is. > > [ 720.199748] 0 pages HighMem/MovableOnly > [ 720.199749] 150524 pages reserved > [ 720.199749] 0 pages cma reserved > [ 720.199750] 0 pages hwpoisoned > [ 722.187335] XFS: Assertion failed: oldlen > newlen, file: fs/xfs/libxfs/xfs_bmap.c, line: 2867 > [ 722.201784] ------------[ cut here ]------------ ... > > # ls -l /tmp/file > -rw------- 1 kumaneko kumaneko 43426648064 Feb 7 19:25 /tmp/file > # xfs_io -c "fiemap -v" /tmp/file > /tmp/file: > EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS > 0: [0..262015]: 358739712..359001727 262016 0x0 ... > 187: [84810808..84901119]: 110211736..110302047 90312 0x1 Ok, from the size of the file I realized that I missed you were running in a loop the first time around. I tried playing with it some more and still haven't been able to reproduce. Anyways, the patch intended to fix this has been reviewed[1] and queued for the next release, so it's probably not a big deal since you've already verified it. Thanks again. Brian [1] http://www.spinics.net/lists/linux-xfs/msg04083.html -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
