Messages in this thread | | | Date | Sun, 08 Apr 2012 16:49:15 +0800 | From | Liu Bo <> | Subject | Re: [3.4-rc1] attempt to access beyond end of device and livelock |
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On 04/06/2012 07:36 PM, Daniel J Blueman wrote: > Hi Josef, Chris, > > When testing BTRFS with RAID 0 metadata on linux-3.4-rc1, we see > discard ranges exceeding the end of the block device [1], potentially > causing dataloss; when this occurs, filesystem writeback becomes > catatonic due to continual resubmission. > > Simply mounting with discard a raid0 metadata filesystem and copying > some data in [2] provokes the issue. > > Thanks, > Daniel > > --- [1] > > attempt to access beyond end of device > ram0: rw=129, want=8452072, limit=4096000 > ... > > --- [2] > > modprobe brd rd_size=2048000 (or boot with ramdisk_size=2048000) > mkfs.btrfs -m raid0 /dev/ram0 /dev/ram1 > mount /dev/ram0 /mnt -o discard > cd /mnt && tar -xvzf linux.tar.gz > <access beyond end of device and livelock>
Thanks for the report, this bug shows we've miscalculated the length of discard extents.
I'll send a patch for this soon.
thanks, -- liubo
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