On 06/02/2016 08:22 AM, David Drysdale wrote:
FWIW, I'm also seeing kmemleak report a leak with v4.7-rc1, in
a different scenario (just normal desktop use). Not done much
digging so far, but this commit (9082e87bf) looks like it might be
relevant -- lots of the following:
unreferenced object 0xffff8800c288e900 (size 256):
comm "dconf-service", pid 1461, jiffies 4294895636 (age 48.028s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 c0 a4 c0 c6 00 88 ff ff ................
02 20 00 20 00 00 00 00 11 00 00 00 00 00 00 00 . . ............
backtrace:
[<ffffffff81955228>] kmemleak_alloc+0x28/0x50
[<ffffffff81268bdc>] kmem_cache_alloc+0xfc/0x360
[<ffffffff81203275>] mempool_alloc_slab+0x15/0x20
[<ffffffff812030de>] mempool_alloc+0x6e/0x170
[<ffffffff815014e8>] bio_alloc_bioset+0xb8/0x230
[<ffffffff81514174>] next_bio+0x24/0x50
[<ffffffff815145ef>] blkdev_issue_zeroout+0xdf/0x1d0
[<ffffffff8132ce79>] ext4_issue_zeroout+0x39/0x50
[<ffffffff81357abf>] ext4_ext_zeroout+0x2f/0x40
[<ffffffff8135ece0>] ext4_ext_map_blocks+0x1870/0x2190
[<ffffffff8132cfa1>] ext4_map_blocks+0x111/0x620
[<ffffffff81330dc8>] ext4_writepages+0x7c8/0x10a0
[<ffffffff81211851>] do_writepages+0x21/0x30
[<ffffffff812012ba>] __filemap_fdatawrite_range+0xaa/0xf0
[<ffffffff812013fd>] filemap_write_and_wait_range+0x2d/0x70
[<ffffffff81326f6d>] ext4_sync_file+0x18d/0x500
(+Christoph)
With kernel v4.7-rc1 and XFS I see that the blkdev_issue_zeroout() calls
triggered by xfstests make kmemleak complain. I hadn't seen this with
any previous kernel version.
Bart.
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