Re: v4.14-rc2/arm64 kernel BUG at net/core/skbuff.c:2626

2017-10-03 Thread Eric Dumazet
On Tue, Oct 3, 2017 at 9:06 AM, Dmitry Vyukov wrote: > On Tue, Oct 3, 2017 at 5:38 PM, 'Eric Dumazet' via syzkaller > wrote: >> On Tue, Oct 3, 2017 at 8:19 AM, Dmitry Vyukov wrote: >>> On Mon, Oct 2, 2017 at 4:42 PM, 'Eric

Re: v4.14-rc2/arm64 kernel BUG at net/core/skbuff.c:2626

2017-10-03 Thread Dmitry Vyukov
On Tue, Oct 3, 2017 at 5:38 PM, 'Eric Dumazet' via syzkaller wrote: > On Tue, Oct 3, 2017 at 8:19 AM, Dmitry Vyukov wrote: >> On Mon, Oct 2, 2017 at 4:42 PM, 'Eric Dumazet' via syzkaller >> wrote: >>> On Mon, Oct 2,

Re: v4.14-rc2/arm64 kernel BUG at net/core/skbuff.c:2626

2017-10-03 Thread Eric Dumazet
On Tue, Oct 3, 2017 at 8:19 AM, Dmitry Vyukov wrote: > On Mon, Oct 2, 2017 at 4:42 PM, 'Eric Dumazet' via syzkaller > wrote: >> On Mon, Oct 2, 2017 at 7:21 AM, Mark Rutland wrote: >>> Hi Eric, >>> >>> On Mon, Oct 02, 2017 at

Re: v4.14-rc2/arm64 kernel BUG at net/core/skbuff.c:2626

2017-10-03 Thread Dmitry Vyukov
On Mon, Oct 2, 2017 at 4:42 PM, 'Eric Dumazet' via syzkaller wrote: > On Mon, Oct 2, 2017 at 7:21 AM, Mark Rutland wrote: >> Hi Eric, >> >> On Mon, Oct 02, 2017 at 06:36:32AM -0700, Eric Dumazet wrote: >>> On Mon, Oct 2, 2017 at 3:49 AM, Mark

Re: v4.14-rc2/arm64 kernel BUG at net/core/skbuff.c:2626

2017-10-02 Thread Mark Rutland
On Mon, Oct 02, 2017 at 10:27:15AM -0700, Eric Dumazet wrote: > On Mon, Oct 2, 2017 at 10:21 AM, Mark Rutland wrote: > > On Mon, Oct 02, 2017 at 07:48:28AM -0700, Eric Dumazet wrote: > >> Please try the following fool proof patch. > >> > >> This is what I had in my local

Re: v4.14-rc2/arm64 kernel BUG at net/core/skbuff.c:2626

2017-10-02 Thread Eric Dumazet
On Mon, Oct 2, 2017 at 10:21 AM, Mark Rutland wrote: > On Mon, Oct 02, 2017 at 07:48:28AM -0700, Eric Dumazet wrote: >> Please try the following fool proof patch. >> >> This is what I had in my local tree back in August but could not >> conclude on the syzkaller bug I was

Re: v4.14-rc2/arm64 kernel BUG at net/core/skbuff.c:2626

2017-10-02 Thread Mark Rutland
On Mon, Oct 02, 2017 at 07:48:28AM -0700, Eric Dumazet wrote: > Please try the following fool proof patch. > > This is what I had in my local tree back in August but could not > conclude on the syzkaller bug I was working on. > > diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c > index >

Re: v4.14-rc2/arm64 kernel BUG at net/core/skbuff.c:2626

2017-10-02 Thread Mark Rutland
On Mon, Oct 02, 2017 at 07:48:28AM -0700, Eric Dumazet wrote: > Please try the following fool proof patch. > > This is what I had in my local tree back in August but could not > conclude on the syzkaller bug I was working on. Thanks, I'll give this a go shortly. I'm currently minimizing the

Re: v4.14-rc2/arm64 kernel BUG at net/core/skbuff.c:2626

2017-10-02 Thread Mark Rutland
On Mon, Oct 02, 2017 at 07:42:17AM -0700, Eric Dumazet wrote: > On Mon, Oct 2, 2017 at 7:21 AM, Mark Rutland wrote: > > Just to check I've understood correctly, are you suggesting that the > > IPv4 code should also check the dev->mtu against a IP_MIN_MTU (which > > doesn't

Re: v4.14-rc2/arm64 kernel BUG at net/core/skbuff.c:2626

2017-10-02 Thread Eric Dumazet
On Mon, 2017-10-02 at 15:21 +0100, Mark Rutland wrote: > Hi Eric, > > On Mon, Oct 02, 2017 at 06:36:32AM -0700, Eric Dumazet wrote: > > On Mon, Oct 2, 2017 at 3:49 AM, Mark Rutland wrote: > > > I hit the below splat at net/core/skbuff.c:2626 while fuzzing v4.14-rc2 > > > on

Re: v4.14-rc2/arm64 kernel BUG at net/core/skbuff.c:2626

2017-10-02 Thread Eric Dumazet
On Mon, Oct 2, 2017 at 7:21 AM, Mark Rutland wrote: > Hi Eric, > > On Mon, Oct 02, 2017 at 06:36:32AM -0700, Eric Dumazet wrote: >> On Mon, Oct 2, 2017 at 3:49 AM, Mark Rutland wrote: >> > I hit the below splat at net/core/skbuff.c:2626 while fuzzing

Re: v4.14-rc2/arm64 kernel BUG at net/core/skbuff.c:2626

2017-10-02 Thread Mark Rutland
Hi Eric, On Mon, Oct 02, 2017 at 06:36:32AM -0700, Eric Dumazet wrote: > On Mon, Oct 2, 2017 at 3:49 AM, Mark Rutland wrote: > > I hit the below splat at net/core/skbuff.c:2626 while fuzzing v4.14-rc2 > > on arm64 with Syzkaller. This is the BUG_ON(len) at the end of > >

Re: v4.14-rc2/arm64 kernel BUG at net/core/skbuff.c:2626

2017-10-02 Thread Eric Dumazet
On Mon, Oct 2, 2017 at 3:49 AM, Mark Rutland wrote: > Hi all, > > I hit the below splat at net/core/skbuff.c:2626 while fuzzing v4.14-rc2 > on arm64 with Syzkaller. This is the BUG_ON(len) at the end of > skb_copy_and_csum_bits(). > > I've uploaded a copy of the splat, my

v4.14-rc2/arm64 kernel BUG at net/core/skbuff.c:2626

2017-10-02 Thread Mark Rutland
Hi all, I hit the below splat at net/core/skbuff.c:2626 while fuzzing v4.14-rc2 on arm64 with Syzkaller. This is the BUG_ON(len) at the end of skb_copy_and_csum_bits(). I've uploaded a copy of the splat, my config, and (full) Syzkaller log to my kernel.org web space [1]. I haven't had the