linux-block.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Jens Axboe <axboe@kernel.dk>
To: Yanfei Xu <yanfei.xu@windriver.com>, tj@kernel.org
Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
	cgroups@vger.kernel.org
Subject: Re: [PATCH] blkcg: fix memory leak in blk_iolatency_init
Date: Wed, 15 Sep 2021 11:58:09 -0600	[thread overview]
Message-ID: <db4a41c9-9ba6-ea8e-8ebe-cf292d796308@kernel.dk> (raw)
In-Reply-To: <20210915072426.4022924-1-yanfei.xu@windriver.com>

On 9/15/21 1:24 AM, Yanfei Xu wrote:
> BUG: memory leak
> unreferenced object 0xffff888129acdb80 (size 96):
>   comm "syz-executor.1", pid 12661, jiffies 4294962682 (age 15.220s)
>   hex dump (first 32 bytes):
>     20 47 c9 85 ff ff ff ff 20 d4 8e 29 81 88 ff ff   G...... ..)....
>     01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff82264ec8>] kmalloc include/linux/slab.h:591 [inline]
>     [<ffffffff82264ec8>] kzalloc include/linux/slab.h:721 [inline]
>     [<ffffffff82264ec8>] blk_iolatency_init+0x28/0x190 block/blk-iolatency.c:724
>     [<ffffffff8225b8c4>] blkcg_init_queue+0xb4/0x1c0 block/blk-cgroup.c:1185
>     [<ffffffff822253da>] blk_alloc_queue+0x22a/0x2e0 block/blk-core.c:566
>     [<ffffffff8223b175>] blk_mq_init_queue_data block/blk-mq.c:3100 [inline]
>     [<ffffffff8223b175>] __blk_mq_alloc_disk+0x25/0xd0 block/blk-mq.c:3124
>     [<ffffffff826a9303>] loop_add+0x1c3/0x360 drivers/block/loop.c:2344
>     [<ffffffff826a966e>] loop_control_get_free drivers/block/loop.c:2501 [inline]
>     [<ffffffff826a966e>] loop_control_ioctl+0x17e/0x2e0 drivers/block/loop.c:2516
>     [<ffffffff81597eec>] vfs_ioctl fs/ioctl.c:51 [inline]
>     [<ffffffff81597eec>] __do_sys_ioctl fs/ioctl.c:874 [inline]
>     [<ffffffff81597eec>] __se_sys_ioctl fs/ioctl.c:860 [inline]
>     [<ffffffff81597eec>] __x64_sys_ioctl+0xfc/0x140 fs/ioctl.c:860
>     [<ffffffff843fa745>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff843fa745>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
> 
> Once blk_throtl_init() queue init failed, blkcg_iolatency_exit() will
> not be invoked for cleanup. That leads a memory leak. Swap the
> blk_throtl_init() and blk_iolatency_init() calls can solve this.

Applied, thanks.

-- 
Jens Axboe


      parent reply	other threads:[~2021-09-15 17:58 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-15  7:24 Yanfei Xu
2021-09-15 17:43 ` Tejun Heo
2021-09-15 17:58 ` Jens Axboe [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=db4a41c9-9ba6-ea8e-8ebe-cf292d796308@kernel.dk \
    --to=axboe@kernel.dk \
    --cc=cgroups@vger.kernel.org \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=tj@kernel.org \
    --cc=yanfei.xu@windriver.com \
    --subject='Re: [PATCH] blkcg: fix memory leak in blk_iolatency_init' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).