netdev - Re: INFO: task hung in tls_sw

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Date:   Mon, 19 Aug 2019 14:09:59 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     syzbot <syzbot+8a6df99c3b1812093b70@...kaller.appspotmail.com>
Cc:     ast@...nel.org, aviadye@...lanox.com, borisp@...lanox.com,
        bpf@...r.kernel.org, daniel@...earbox.net, davejwatson@...com,
        davem@...emloft.net, john.fastabend@...il.com, kafai@...com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        songliubraving@...com, syzkaller-bugs@...glegroups.com, yhs@...com,
        Eric Biggers <ebiggers@...nel.org>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        linux-crypto@...r.kernel.org
Subject: Re: INFO: task hung in tls_sw_sendmsg

On Mon, 11 Mar 2019 01:20:05 -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    d9862cfb Merge tag 'mips_5.1' of git://git.kernel.org/pub/..
> git tree:       net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=16e9d977200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=73d88a42238825ad
> dashboard link: https://syzkaller.appspot.com/bug?extid=8a6df99c3b1812093b70
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> userspace arch: amd64
> 
> 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+8a6df99c3b1812093b70@...kaller.appspotmail.com

Looks like the TLS bugs which involve pcrypt may be a pcrypt issue.
There seems to be no clear explanation for these in TLS code.

#syz dup: INFO: task hung in aead_recvmsg

This is similar to:
https://syzkaller.appspot.com/bug?id=44ae4b4fa7e6c6e92aa921d2ec20ce9fbee97939
(INFO: task hung in tls_sw_free_resources_tx)