[Bug 649099] Re: network freezes when creating tap devices and adding them to a bridge in parallel

[salva]

** Description changed:

  Sometimes when creating several new tap devices and adding them to a
  bridge interface in parallel the network freezes for some seconds.
  
  The attached C program can be used to replicate the problem.
  
  In a host with a bridge interface configured as its main network
  interface, compile the program and then run it from the shell as root as
  follows:
  
-   # while ping -c 1 10.1.0.1; do ./a.out 20 bridge0; done
+   # while ping -c 1 10.1.0.1; do ./a.out 20 bridge0; done
  
  substituting bridge0 by the name of bridge interface and the IP 10.1.0.1
  by the IP of some machine reachable though the bridge (for instance the
  default router).
  
  Also keep pinging the bridge interface from another machine so that the
  problem becomes easily noticeable.
  
- Eventually, the traffic through the bridge interface will stop for some
- seconds (~8s).
+ Eventually, the traffic through the bridge interface will stop for
+ several seconds (~30s).
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-image-2.6.32-24-generic 2.6.32-24.42
  Regression: No
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.32-24.42-generic 2.6.32.15+drm33.5
  Uname: Linux 2.6.32-24-generic x86_64
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  Date: Mon Sep 27 18:42:03 2010
  Lsusb:
-  Bus 002 Device 003: ID 0424:2514 Standard Microsystems Corp. 
-  Bus 002 Device 002: ID 8087:0020  
-  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
-  Bus 001 Device 002: ID 8087:0020  
-  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 002 Device 003: ID 0424:2514 Standard Microsystems Corp.
+  Bus 002 Device 002: ID 8087:0020
+  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 001 Device 002: ID 8087:0020
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. PowerEdge R210
  PciMultimedia:
-  
+ 
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.32-24-generic root=/dev/mapper/qvd--test2-root ro quiet
  ProcEnviron:
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  SourcePackage: linux
  dmi.bios.date: 05/24/2010
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.3.4
  dmi.board.name: 0M877N
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A02
  dmi.chassis.type: 23
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr1.3.4:bd05/24/2010:svnDellInc.:pnPowerEdgeR210:pvr:rvnDellInc.:rn0M877N:rvrA02:cvnDellInc.:ct23:cvr:
  dmi.product.name: PowerEdge R210
  dmi.sys.vendor: Dell Inc.

-- 
network freezes when creating tap devices and adding them to a bridge in parallel
https://bugs.launchpad.net/bugs/649099
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