They are allocated in blkcg_css_alloc().
This bug is reported by the kmemleak subsystem:
unreferenced object 0xffff88007d004d60 (size 32):
comm "systemd", pid 1, jiffies 4294668449 (age 34.455s)
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 f4 01 00 00 f4 01 00 00 ................
backtrace:
[<ffffffff816ce9ce>] kmemleak_alloc+0x4e/0xb0
[<ffffffff811baf94>] __kmalloc+0x1e4/0x290
[<ffffffff8133eb5d>] blkcg_css_alloc+0x6d/0x120
[<ffffffff81108124>] create_css+0x44/0x220
[<ffffffff8110bcf0>] cgroup_mkdir+0x220/0x2c0
[<ffffffff812513fa>] kernfs_iop_mkdir+0x5a/0x80
[<ffffffff811dfddb>] vfs_mkdir+0xbb/0x150
[<ffffffff811e50ea>] SyS_mkdir+0x7a/0xe0
[<ffffffff816d822e>] entry_SYSCALL_64_fastpath+0x12/0x71
[<ffffffffffffffff>] 0xffffffffffffffff
Fixes: e48453c386f3 ('block, cgroup: implement policy-specific per-blkcg data')
Signed-off-by: Andrey Vagin <[email protected]>
---
block/blk-cgroup.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 9f97da5..aa04821 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -821,6 +821,10 @@ static void blkcg_css_offline(struct cgroup_subsys_state
*css)
static void blkcg_css_free(struct cgroup_subsys_state *css)
{
struct blkcg *blkcg = css_to_blkcg(css);
+ int i;
+
+ for (i = 0; i < BLKCG_MAX_POLS ; i++)
+ kfree(blkcg->pd[i]);
if (blkcg != &blkcg_root)
kfree(blkcg);
--
2.1.0
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