netdev - Re: INFO: task hung in tls_sw_release_resources

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Date:   Mon, 19 Aug 2019 14:12:55 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Steffen Klassert <steffen.klassert@...unet.com>,
        syzbot <syzbot+6a9ff159672dfbb41c95@...kaller.appspotmail.com>,
        ast@...nel.org, aviadye@...lanox.com, borisp@...lanox.com,
        bpf@...r.kernel.org, daniel@...earbox.net, davejwatson@...com,
        davem@...emloft.net, hdanton@...a.com, john.fastabend@...il.com,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        herbert@...dor.apana.org.au, linux-crypto@...r.kernel.org
Subject: Re: INFO: task hung in tls_sw_release_resources_tx

On Fri, 16 Aug 2019 22:47:43 -0700, Eric Biggers wrote:
> [+Steffen, who is the maintainer of pcrypt]
> 
> On Fri, Aug 16, 2019 at 07:02:34PM -0700, Jakub Kicinski wrote:
> > On Thu, 15 Aug 2019 11:06:00 -0700, syzbot wrote:  
> > > syzbot has bisected this bug to:
> > > 
> > > commit 130b392c6cd6b2aed1b7eb32253d4920babb4891
> > > Author: Dave Watson <davejwatson@...com>
> > > Date:   Wed Jan 30 21:58:31 2019 +0000
> > > 
> > >      net: tls: Add tls 1.3 support
> > > 
> > > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=118e8dee600000
> > > start commit:   6d5afe20 sctp: fix memleak in sctp_send_reset_streams
> > > git tree:       net
> > > final crash:    https://syzkaller.appspot.com/x/report.txt?x=138e8dee600000
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=158e8dee600000
> > > kernel config:  https://syzkaller.appspot.com/x/.config?x=a4c9e9f08e9e8960
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=6a9ff159672dfbb41c95
> > > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17cb0502600000
> > > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14d5dc22600000
> > > 
> > > Reported-by: syzbot+6a9ff159672dfbb41c95@...kaller.appspotmail.com
> > > Fixes: 130b392c6cd6 ("net: tls: Add tls 1.3 support")
> > > 
> > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection  
> > 
> > CC Herbert, linux-crypto
> > 
> > This is got to be something in the crypto code :S 
> > 
> > The test case opens a ktls socket and back log writes to it.
> > Then it opens a AF_ALG socket, binds "pcrypt(gcm(aes))" and dies.
> > 
> > The ktls socket upon close waits for async crypto callbacks, but they
> > never come. If I unset CRYPTO_USER_API_AEAD or change the alg to bind
> > to "gcm(aes)" the bug does not trigger.
> > 
> > Any suggestions?  
> 
> Seeing as pcrypt is involved and this is a "task hung" bug, this is probably
> caused by the recursive pcrypt deadlock, which is yet to be fixed.
> 
> See the original thread for more info:
> 
> 	https://groups.google.com/forum/#!msg/syzkaller-bugs/1_CXUd3gBcg/BvsRLH0lAgAJ
> 
> And the syzbot dashboard link:
> 
> 	https://syzkaller.appspot.com/bug?id=178f2528d10720d563091fb51dceb4cb20f75525
> 
> Let's tell syzbot this is a duplicate:
> 
> #syz dup: INFO: task hung in aead_recvmsg

Thanks for the suggestion Eric!

Looks like the dup didn't tickle syzbot the right way. Let me retry
sending this directly to the original report.