[+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@xxxxxx> > > 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@xxxxxxxxxxxxxxxxxxxxxxxxx > > 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
