From: Eric Dumazet <eric.dumazet@gmail.com>
To: Dave Jones <davej@redhat.com>
Cc: netdev@vger.kernel.org,
Fedora Kernel Team <kernel-team@fedoraproject.org>
Subject: Re: WARNING: at net/ipv4/tcp.c:1598 tcp_recvmsg+0x641/0xd30()
Date: Fri, 10 Aug 2012 22:40:18 +0200 [thread overview]
Message-ID: <1344631218.31104.2745.camel@edumazet-glaptop> (raw)
In-Reply-To: <20120810202910.GA19359@redhat.com>
On Fri, 2012-08-10 at 16:29 -0400, Dave Jones wrote:
> On Mon, Aug 06, 2012 at 11:46:16AM -0400, Dave Jones wrote:
> > We just got an automated report of this WARN being hit in 3.5
> >
> > > backtrace:
> > > :WARNING: at net/ipv4/tcp.c:1598 tcp_recvmsg+0x641/0xd30()
> > > :Hardware name: P5Q DELUXE
> > > :recvmsg bug: copied 99F66400 seq 99F6A4A8 rcvnxt 99F6CDAD fl 0
> > > : [<ffffffff811848e6>] do_sync_read+0xe6/0x120
> > > : [<ffffffff81275eea>] ? inode_has_perm.isra.31.constprop.61+0x2a/0x30
> > > : [<ffffffff81272f32>] ? security_file_permission+0x92/0xb0
> > > : [<ffffffff81184d81>] ? rw_verify_area+0x61/0xf0
> > > : [<ffffffff811852cd>] vfs_read+0x15d/0x180
> > > : [<ffffffff8118533a>] sys_read+0x4a/0x90
> > > : [<ffffffff8160fc29>] system_call_fastpath+0x16/0x1b
> >
> > 1594 /* Now that we have two receive queues this
> > 1595 * shouldn't happen.
> > 1596 */
> > 1597 if (WARN(before(*seq, TCP_SKB_CB(skb)->seq),
> > 1598 "recvmsg bug: copied %X seq %X rcvnxt %X fl %X\n",
> > 1599 *seq, TCP_SKB_CB(skb)->seq, tp->rcv_nxt,
> > 1600 flags))
> > 1601 break;
> >
> >
> > Hopefully this means more to you guys than it does to me.
>
> We're getting more reports of this happening too.
>
> This guy managed to hit both of the recvmsg BUG's.
>
> https://bugzilla.redhat.com/show_bug.cgi?id=846996
> https://bugzilla.redhat.com/show_bug.cgi?id=846991
>
> The first reporter claimed to be doing nothing special, just browsing with google chrome.
>
> Anyone ?
Might be a driver issue with LRO / GRO/ TCP coalescing
So we need a _lot_ of details.
next prev parent reply other threads:[~2012-08-10 20:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-06 15:46 WARNING: at net/ipv4/tcp.c:1598 tcp_recvmsg+0x641/0xd30() Dave Jones
2012-08-10 20:29 ` Dave Jones
2012-08-10 20:40 ` Eric Dumazet [this message]
2012-08-20 16:20 ` Dave Jones
2012-08-20 16:42 ` Eric Dumazet
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