linux-kernel - RE: BUG: sleeping function called from invalid context at net/core/sock.c:LINE (3)

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Date:   Mon, 19 Feb 2018 13:23:50 +0000
From:   Jon Maloy <jon.maloy@...csson.com>
To:     Kirill Tkhai <ktkhai@...tuozzo.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+749d9d87c294c00ca856@...kaller.appspotmail.com>,
        Ying Xue <ying.xue@...driver.com>
CC:     Andrei Vagin <avagin@...tuozzo.com>,
        David Miller <davem@...emloft.net>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Florian Westphal <fw@...len.de>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        "Nicolas Dichtel" <nicolas.dichtel@...nd.com>,
        "roman.kapl@...go.com" <roman.kapl@...go.com>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>,
        "tipc-discussion@...ts.sourceforge.net" 
        <tipc-discussion@...ts.sourceforge.net>
Subject: RE: BUG: sleeping function called from invalid context at
 net/core/sock.c:LINE (3)

I don't understand this one. tipc_topsrv_stop() can only be trigged from a user doing rmmod(), and I double checked that this is running in user mode.
How does the call chain you are reporting occur?

///jon


> -----Original Message-----
> From: Kirill Tkhai [mailto:ktkhai@...tuozzo.com]
> Sent: Saturday, February 17, 2018 23:23
> To: Dmitry Vyukov <dvyukov@...gle.com>; syzbot
> <syzbot+749d9d87c294c00ca856@...kaller.appspotmail.com>; Jon Maloy
> <jon.maloy@...csson.com>; Ying Xue <ying.xue@...driver.com>
> Cc: Andrei Vagin <avagin@...tuozzo.com>; David Miller
> <davem@...emloft.net>; Eric W. Biederman <ebiederm@...ssion.com>;
> Florian Westphal <fw@...len.de>; LKML <linux-kernel@...r.kernel.org>;
> netdev <netdev@...r.kernel.org>; Nicolas Dichtel
> <nicolas.dichtel@...nd.com>; roman.kapl@...go.com; syzkaller-
> bugs@...glegroups.com; tipc-discussion@...ts.sourceforge.net
> Subject: Re: BUG: sleeping function called from invalid context at
> net/core/sock.c:LINE (3)
> 
> On 17.02.2018 11:15, Dmitry Vyukov wrote:
> > On Sat, Feb 17, 2018 at 4:00 AM, syzbot
> > <syzbot+749d9d87c294c00ca856@...kaller.appspotmail.com> wrote:
> >> Hello,
> >>
> >> syzbot hit the following crash on net-next commit
> >> 65bd449c32c2745df61913ab54087e77f9d9b70d (Fri Feb 16 20:26:35 2018
> >> +0000) Merge branch 'tipc-de-generealize-topology-server'
> >
> > +tipc maintainers
> 
> This looks to be caused by commit 0ef897be12b8
> "tipc: separate topology server listener socket from subcsriber sockets"
> 
> Thanks,
> Kirill