linux-kernel - Re: WARNING in cma_exit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20190403051140.GU3201@mtr-leonro.mtl.com>
Date:   Wed, 3 Apr 2019 08:11:40 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     Jason Gunthorpe <jgg@...pe.ca>,
        syzbot <syzbot+2e3e485d5697ea610460@...kaller.appspotmail.com>,
        Matthew Wilcox <willy@...radead.org>, danielj@...lanox.com,
        danitg@...lanox.com, dledford@...hat.com,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        parav@...lanox.com, swise@...ngridcomputing.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in cma_exit_net

On Tue, Apr 02, 2019 at 04:39:12PM -0700, Bart Van Assche wrote:
> On Mon, 2019-04-01 at 21:29 +0300, Leon Romanovsky wrote:
> > On Mon, Apr 01, 2019 at 02:45:54PM -0300, Jason Gunthorpe wrote:
> > > On Mon, Apr 01, 2019 at 10:36:05AM -0700, syzbot wrote:
> > > > Hello,
> > > >
> > > > syzbot found the following crash on:
> > > >
> > > > HEAD commit:    e3ecb83e Add linux-next specific files for 20190401
> > > > git tree:       linux-next
> > > > console output: https://syzkaller.appspot.com/x/log.txt?x=13bc36cd200000
> > > > kernel config:  https://syzkaller.appspot.com/x/.config?x=db6c9f2bfeb91a99
> > > > dashboard link: https://syzkaller.appspot.com/bug?extid=2e3e485d5697ea610460
> > > > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > > >
> > > > Unfortunately, I don't have any reproducer for this crash yet.
> > > >
> > > > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > > > Reported-by: syzbot+2e3e485d5697ea610460@...kaller.appspotmail.com
> > > >
> > > > WARNING: CPU: 1 PID: 7 at drivers/infiniband/core/cma.c:4674
> > > > cma_exit_net+0x327/0x390 drivers/infiniband/core/cma.c:4674
> > > > Kernel panic - not syncing: panic_on_warn set ...
> > >
> > > Matt: This is why the WARN_ON(!xa_empty()) is so valuable. Magically
> > > syzkaller can find something in this code is buggy.
> > >
> > > Mellanox is also showing a different testing failure over the weekend
> > > (use after free or something) from your 'cma: Convert portspace IDRs
> > > to XArray'
> >
> > This is what I see in my environment.

Bart,

This patch [1] will fix it.

Thanks

[1] https://patchwork.kernel.org/patch/10881501/

Download attachment "signature.asc" of type "application/pgp-signature" (802 bytes)