Re: [syzbot] possible deadlock in blk_request_module

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Hello, Jens.

On 2021/09/23 9:52, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    93ff9f13be91 Merge tag 's390-5.15-3' of git://git.kernel.o..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=15d5b33d300000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=6d93fe4341f98704
> dashboard link: https://syzkaller.appspot.com/bug?extid=384fb45e189bf86b6bb9
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+384fb45e189bf86b6bb9@xxxxxxxxxxxxxxxxxxxxxxxxx

Will you pick up

https://lkml.kernel.org/r/e205f13d-18ff-a49c-0988-7de6ea5ff823@xxxxxxxxxxxxxxxxxxx

which avoids add_disk() with brd_devices_mutex held?

Also, will you pick up

https://lkml.kernel.org/r/692fdc1a-6396-dcf4-c700-2d822f161053@xxxxxxxxxxxxxxxxxxx

which avoids double kfree() ?



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