netdev - Re: [syzbot] [rdma?] INFO: task hung in add_one_compat

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Message-ID: <20241022142901.GA13306@ziepe.ca>
Date: Tue, 22 Oct 2024 11:29:01 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: syzbot <syzbot+6dee15fdb0606ef7b6ba@...kaller.appspotmail.com>
Cc: leon@...nel.org, linux-kernel@...r.kernel.org,
	linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [rdma?] INFO: task hung in add_one_compat_dev (3)

On Tue, Oct 22, 2024 at 12:39:27AM -0700, syzbot wrote:

> 1 lock held by syz-executor/27959:
>  #0: ffffffff8fcbffc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
>  #0: ffffffff8fcbffc8 (rtnl_mutex){+.+.}-{3:3}, at: __rtnl_newlink net/core/rtnetlink.c:3749 [inline]
>  #0: ffffffff8fcbffc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_newlink+0xab7/0x20a0 net/core/rtnetlink.c:3772

There is really something wrong with the new sykzaller reporting, can
someone fix it?

The kernel log that shows the programs:

https://syzkaller.appspot.com/x/log.txt?x=10d72727980000

Doesn't have the word "newlink"/"new"/"link" etc, and yet there is an
executor clearly sitting in a newlink netlink callback when we
crashed.

We need to see the syzkaller programs that are triggering these issues
to get ideas, and for some reason they are missing now.

Jason