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Message-ID: <20250730083641.3512-1-hdanton@sina.com>
Date: Wed, 30 Jul 2025 16:36:40 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+9921e319bd6168140b40@...kaller.appspotmail.com>
Cc: Yu Kuai <yukuai1@...weicloud.com>,
Paul Menzel <pmenzel@...gen.mpg.de>,
Xiao Ni <xni@...hat.com>,
linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [fuse?] WARNING: refcount bug in process_scheduled_works
> Date: Tue, 29 Jul 2025 14:58:32 -0700 [thread overview]
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: ced1b9e0392d Merge tag 'ata-6.17-rc1' of git://git.kernel...
> git tree: upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=15c89782580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=d51af648924b64c9
> dashboard link: https://syzkaller.appspot.com/bug?extid=9921e319bd6168140b40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=177f7034580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=165e44a2580000
Test Yu Kuai's fix (https://lore.kernel.org/lkml/20250730073321.2583158-1-yukuai1@huaweicloud.com/)
#syz test
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -636,6 +636,12 @@ static void __mddev_put(struct mddev *mddev)
mddev->ctime || mddev->hold_active)
return;
+ /*
+ * If array is freed by stopping array, MD_DELETED is set by
+ * do_md_stop(), MD_DELETED is still set here in cause mddev is freed
+ * directly by closing a mddev that is created by create_on_open.
+ */
+ set_bit(MD_DELETED, &mddev->flags);
/*
* Call queue_work inside the spinlock so that flush_workqueue() after
* mddev_find will succeed in waiting for the work to be done.
--
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