[+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 <[email protected]>
> > 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: [email protected]
> > 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
Steffen, do you have any plan to fix this?
- Eric
