Re: [bugzilla:219548] the kernel crashes when storing an EXT4 file system in a ZRAM device

On (24/12/12 04:14), Matthew Wilcox wrote:

quoted

We've got two reports [1] [2] (could be the same person) which
suggest that ext4 may change page content while the page is under
write().  The particular problem here the case when ext4 is on
the zram device.  zram compresses every page written to it, so if
the page content can be modified concurrently with zram's compression
then we can't really use zram with ext4.

Do you set BLK_FEAT_STABLE_WRITES on zram?

Yes, zram sets BLK_FEAT_STABLE_WRITES and BLK_FEAT_SYNCHRONOUS.