Public bug reported:

up to date 12.04 internet proxy with squid and privoxy. As soon as another 
machine attempts to use the proxy, it (proxy machine) dies - no reaction to 
keyboard, network, frozen mouse pointer, etc, and no useful messages in syslog; 
but when I try to use internet locally on the proxy machine and via the same 
proxy software it works just fine. 100% repeatable. Booting back to 3.2.0-58 
fixed this issue.
--- 
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  lvm        2583 F.... pulseaudio
 /dev/snd/controlC0:  lvm        2583 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not 
found.
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xfe600000 irq 16'
   Mixer name   : 'Realtek ALC892'
   Components   : 'HDA:10ec0892,18497892,00100302'
   Controls      : 41
   Simple ctrls  : 20
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xfe080000 irq 25'
   Mixer name   : 'Nvidia GPU 0d HDMI/DP'
   Components   : 'HDA:10de000d,10de0101,00100100'
   Controls      : 25
   Simple ctrls  : 5
DistroRelease: Ubuntu 12.04
HibernationDevice: RESUME=UUID=d22ce633-8298-47af-bd3b-b2f2c011e08f
InstallationMedia: Kubuntu 11.04 "Natty Narwhal" - Release i386 (20110427)
IwConfig:
 lo        no wireless extensions.
 
 eth2      no wireless extensions.
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
MarkForUpload: True
NonfreeKernelModules: nvidia
Package: linux (not installed)
ProcFB:
 
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-58-generic-pae 
root=UUID=e5d4b20c-2274-4625-bff0-06fcc27e7755 ro libata.dma=5 quiet splash
ProcVersionSignature: Ubuntu 3.2.0-58.88-generic-pae 3.2.53
PulseList:
 Error: command ['pacmd', 'list'] failed with exit code 1: Home directory 
/home/lvm not ours.
 No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-58-generic-pae N/A
 linux-backports-modules-3.2.0-58-generic-pae  N/A
 linux-firmware                                1.79.9
RfKill:
 
Tags:  precise
Uname: Linux 3.2.0-58-generic-pae i686
UpgradeStatus: Upgraded to precise on 2013-05-14 (284 days ago)
UserGroups:
 
dmi.bios.date: 09/13/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.30
dmi.board.name: 990FX Extreme4
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP1.30:bd09/13/2011:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rn990FXExtreme4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: apport-collected precise

** Tags added: apport-collected precise

** Description changed:

- up to date 12.04 internet proxy with squid and privoxy. As soon as
- another machine attempts to use the proxy, it (proxy machine) dies - no
- reaction to keyboard, network, frozen mouse pointer, etc, and no useful
- messages in syslog; but when I try to use internet locally on the proxy
- machine and via the same proxy software it works just fine. 100%
- repeatable. Booting back to 3.2.0-58 fixed this issue.
+ up to date 12.04 internet proxy with squid and privoxy. As soon as another 
machine attempts to use the proxy, it (proxy machine) dies - no reaction to 
keyboard, network, frozen mouse pointer, etc, and no useful messages in syslog; 
but when I try to use internet locally on the proxy machine and via the same 
proxy software it works just fine. 100% repeatable. Booting back to 3.2.0-58 
fixed this issue.
+ --- 
+ AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
+ ApportVersion: 2.0.1-0ubuntu17.6
+ Architecture: i386
+ AudioDevicesInUse:
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  lvm        2583 F.... pulseaudio
+  /dev/snd/controlC0:  lvm        2583 F.... pulseaudio
+ CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
+ Card0.Amixer.info:
+  Card hw:0 'SB'/'HDA ATI SB at 0xfe600000 irq 16'
+    Mixer name : 'Realtek ALC892'
+    Components : 'HDA:10ec0892,18497892,00100302'
+    Controls      : 41
+    Simple ctrls  : 20
+ Card1.Amixer.info:
+  Card hw:1 'NVidia'/'HDA NVidia at 0xfe080000 irq 25'
+    Mixer name : 'Nvidia GPU 0d HDMI/DP'
+    Components : 'HDA:10de000d,10de0101,00100100'
+    Controls      : 25
+    Simple ctrls  : 5
+ DistroRelease: Ubuntu 12.04
+ HibernationDevice: RESUME=UUID=d22ce633-8298-47af-bd3b-b2f2c011e08f
+ InstallationMedia: Kubuntu 11.04 "Natty Narwhal" - Release i386 (20110427)
+ IwConfig:
+  lo        no wireless extensions.
+  
+  eth2      no wireless extensions.
+ MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
+ MarkForUpload: True
+ NonfreeKernelModules: nvidia
+ Package: linux (not installed)
+ ProcFB:
+  
+ ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-58-generic-pae 
root=UUID=e5d4b20c-2274-4625-bff0-06fcc27e7755 ro libata.dma=5 quiet splash
+ ProcVersionSignature: Ubuntu 3.2.0-58.88-generic-pae 3.2.53
+ PulseList:
+  Error: command ['pacmd', 'list'] failed with exit code 1: Home directory 
/home/lvm not ours.
+  No PulseAudio daemon running, or not running as session daemon.
+ RelatedPackageVersions:
+  linux-restricted-modules-3.2.0-58-generic-pae N/A
+  linux-backports-modules-3.2.0-58-generic-pae  N/A
+  linux-firmware                                1.79.9
+ RfKill:
+  
+ Tags:  precise
+ Uname: Linux 3.2.0-58-generic-pae i686
+ UpgradeStatus: Upgraded to precise on 2013-05-14 (284 days ago)
+ UserGroups:
+  
+ dmi.bios.date: 09/13/2011
+ dmi.bios.vendor: American Megatrends Inc.
+ dmi.bios.version: P1.30
+ dmi.board.name: 990FX Extreme4
+ dmi.board.vendor: ASRock
+ dmi.chassis.asset.tag: To Be Filled By O.E.M.
+ dmi.chassis.type: 3
+ dmi.chassis.vendor: To Be Filled By O.E.M.
+ dmi.chassis.version: To Be Filled By O.E.M.
+ dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP1.30:bd09/13/2011:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rn990FXExtreme4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
+ dmi.product.name: To Be Filled By O.E.M.
+ dmi.product.version: To Be Filled By O.E.M.
+ dmi.sys.vendor: To Be Filled By O.E.M.

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https://bugs.launchpad.net/bugs/1283381

Title:
  system freezes with 3.2.0-59 kernel when serving external internet
  proxy requests

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