linux-kernel - Re: [syzbot] [rdma?] WARNING in gid_table_release

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Date: Fri, 21 Jun 2024 10:05:42 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: syzbot <syzbot+a35b4afb1f00c45977d0@...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?] WARNING in gid_table_release_one

On Wed, Jun 19, 2024 at 11:25:19PM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    a957267fa7e9 Add linux-next specific files for 20240611
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=15a085de980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=9a880e96898e79f8
> dashboard link: https://syzkaller.appspot.com/bug?extid=a35b4afb1f00c45977d0
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/6451759a606b/disk-a957267f.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/7f635dbe5b8a/vmlinux-a957267f.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/33eafd1b8aec/bzImage-a957267f.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+a35b4afb1f00c45977d0@...kaller.appspotmail.com
> 
> infiniband syz1: ib_query_port failed (-19)
> infiniband syz1: Couldn't set up InfiniBand P_Key/GID cache
> ------------[ cut here ]------------
> GID entry ref leak for dev syz1 index 0 ref=1
> WARNING: CPU: 1 PID: 12182 at drivers/infiniband/core/cache.c:809 release_gid_table drivers/infiniband/core/cache.c:806 [inline]
> WARNING: CPU: 1 PID: 12182 at drivers/infiniband/core/cache.c:809 gid_table_release_one+0x33f/0x4d0 drivers/infiniband/core/cache.c:886
> Modules linked in:

Oh look, we changed a dev_err to a WARN_ON and syzkaller immediately
reports that there is some kind of memory leaking bug in rxe :\

Jason