netdev - Re: [Bugme-new] [Bug 8654] New: possible connect() bug

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Message-Id: <20070620095746.5b054da8.akpm@linux-foundation.org>
Date:	Wed, 20 Jun 2007 09:57:46 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	netdev@...r.kernel.org
Cc:	risky@...l.ru,
	"bugme-daemon@...nel-bugs.osdl.org" 
	<bugme-daemon@...nel-bugs.osdl.org>,
	Auke Kok <auke-jan.h.kok@...el.com>
Subject: Re: [Bugme-new] [Bug 8654] New: possible connect() bug

> On Wed, 20 Jun 2007 03:56:28 -0700 (PDT) bugme-daemon@...zilla.kernel.org wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=8654
> 
>            Summary: possible connect() bug
>            Product: Networking
>            Version: 2.5
>      KernelVersion: Linux version 2.6.21.1 (risky@...134.localnet) (gcc
>                     version 3.3.
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: low
>           Priority: P1
>          Component: Other
>         AssignedTo: acme@...stprotocols.net
>         ReportedBy: risky@...l.ru
> 
> 
> ...
>
> 01:01.0 Ethernet controller: Intel Corp. 82547GI Gigabit Ethernet Controller
>         Subsystem: Micro-Star International Co., Ltd.: Unknown device 1490
>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
> Stepping- SERR- FastB2B-
>         Status: Cap+ 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
> <TAbort- <MAbort- >SERR- <PERR-
>         Latency: 0 (63750ns min), cache line size 08
>         Interrupt: pin A routed to IRQ 11
>         Region 0: Memory at fb100000 (32-bit, non-prefetchable) [size=128K]
>         Region 2: I/O ports at b000 [size=32]
>         Capabilities: [dc] Power Management version 2
>                 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
> PME(D0+,D1-,D2-,D3hot+,D3cold+)
>                 Status: D0 PME-Enable- DSel=0 DScale=1 PME-
> 
> ...
> 
> Minimal slackware installation, kernel downloaded from kernel.org
> 
> Problem Description:
> 
> connect() syscall normally reports "no route to host" when is called while
> network cable is
> unplugged, and ethernet interface is up and configured. But it hangs eternally
> and utilizes
> processor up to 100% if one tries to plug ethernet cable in, here two cases:
> a) socket is blocking, connect() is called and did not completed, current
> syscall hangs
> b) socket is non-blocking, connect() normally returns EINPROGRESS, next syscall
> hangs
> 
> Steps to reproduce:
> 
> Just try to plug ethernet cable in while trying to connect()
> 

That might be a device driver bug.  Please generate a kernel profile while
it is occuring (Documentation/basic_profiling.txt) and/or generate a few
sysrq-P traces.  Send them via emailed reply-to-all to this email.

I'll be travelling for the next few days, but hopefully one of the netdev
developers will be able to work with you on this, thanks.  

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