Bug 28442

Summary: 2.6.38-rc3: FUSE (sshfs) hangs under load
Product: Drivers Reporter: Maciej Rutecki (maciej.rutecki)
Component: network-wirelessAssignee: drivers_network-wireless (drivers_network-wireless)
Status: CLOSED CODE_FIX    
Severity: normal CC: dmitry.torokhov, maciej.rutecki, rjw
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 2.6.38-rc3 Subsystem:
Regression: Yes Bisected commit-id:
Bug Depends on:    
Bug Blocks: 27352    

Description Maciej Rutecki 2011-02-06 20:18:04 UTC 
Subject    : 2.6.38-rc3: FUSE (sshfs) hangs under load
Submitter  : Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date       : 2011-02-01 17:54
Message-ID : 20110201175452.GB518@core.coreip.homeip.net
References : http://marc.info/?l=linux-kernel&m=129658291703679&w=2

This entry is being used for tracking a regression from 2.6.37. Please don't
close it until the problem is fixed in the mainline.

Caused by:

commit 4cd06a344db752f513437138953af191cbe9a691
Author: Felix Fietkau <nbd@openwrt.org>
Date:   Sat Dec 18 19:30:49 2010 +0100

    mac80211: skip unnecessary pskb_expand_head calls

    If the skb is not cloned and we don't need any extra headroom, there
    is no point in reallocating the skb head.

    Signed-off-by: Felix Fietkau <nbd@openwrt.org>
    Signed-off-by: John W. Linville <linville@tuxdriver.com>

First-Bad-Commit : 4cd06a344db752f513437138953af191cbe9a691
Comment 1 Rafael J. Wysocki 2011-02-13 11:01:52 UTC 
On Sunday, February 13, 2011, Sedat Dilek wrote:
> On Sat, Feb 12, 2011 at 11:57 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > This message contains a list of some regressions from 2.6.37,
> > for which there are no fixes in the mainline known to the tracking team.
> > If any of them have been fixed already, please let us know.
> >
> > If you know of any other unresolved regressions from 2.6.37, please let us
> > know either and we'll add them to the list.  Also, please let us know
> > if any of the entries below are invalid.
> >
> > Each entry from the list will be sent additionally in an automatic reply
> > to this message with CCs to the people involved in reporting and handling
> > the issue.
> >
> >
> > Listed regressions statistics:
> >
> >  Date          Total  Pending  Unresolved
> >  ----------------------------------------
> >  2011-02-12       39       20          18
> >  2011-02-03       19       11           7
> >
> >
> > Unresolved regressions
> > ----------------------
> 
> > Bug-Entry       : http://bugzilla.kernel.org/show_bug.cgi?id=28442
> > Subject         : 2.6.38-rc3: FUSE (sshfs) hangs under load
> > Submitter       : Dmitry Torokhov <dmitry.torokhov@gmail.com>
> > Date            : 2011-02-01 17:54 (12 days old)
> >
> 
> The fix by Felix [1] was accepted already in Linus tree:
> 
> commit fc7c976dc7a565213393ce700d4a6105f037bf20
> "mac80211: fix the skb cloned check in the tx path"
> 
> Please, remove the entry from the list, Thanks.