On 10/17/21 3:40 PM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 7c832d2f9b95 Add linux-next specific files for 20211015 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=10e9df10b00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f6ac42766a768877 > dashboard link: https://syzkaller.appspot.com/bug?extid=005b78d4c45263d656dd > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1154f80cb00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1750eeecb00000 > > The issue was bisected to: > > commit f328476e373a7ce4b4d16c48fe85571044e025f5 > Author: Christoph Hellwig <hch@xxxxxx> > Date: Tue Oct 12 10:40:45 2021 +0000 > > blk-mq: cleanup blk_mq_submit_bio It's a potential use-after-free using rq->mq_hctx after inserting a flush. I'll fold in a fix, as I'm shuffling things around anyway. -- Jens Axboe
