On 12/21/2015 10:26 PM, Junichi Nomura wrote:
On 12/22/15 12:59, Kent Overstreet wrote:
reproduced it with 32 bit pae:
1. Exclude memory above 4G line with boot param "max_addr=4G".
doesn't work - max_addr=1G doesn't work either
2. Disable highmem with "highmem=0".
works!
3. Try booting 64bit kernel.
works
blk_queue_bio() does split then bounce, which makes the segment
counting based on pages before bouncing and could go wrong.
Good catch! The blk-mq parts aren't affected by this, the screw up only
happened in the old IO path. I've added this with the appropriate
tested-by from Artem, and CC stable and listed the commit that broke it:
commit 54efd50bfd873e2dbf784e0b21a8027ba4299a3e
Author: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Date: Thu Apr 23 22:37:18 2015 -0700
block: make generic_make_request handle arbitrarily sized bios
Thanks to all involved in nailing this down, it'll go out shortly.
--
Jens Axboe
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