[Bug 653388] Re: 10.10 RC: serial8250: too much work for irq (Motorola SM56 modem, RS480, SB400)

Sat Oct 2 17:56:26 UTC 2010

Trouble with bug-reporting towards local midnight: "I lied" in a couple
important ways:

1. I noticed this because it was *continually* flooding dmesg in my
first boot into 10.10 RC; the halt of the messages at [ 335.695389] was
seen on a later boot, and suggests this is an intermittent issue;

2. After announcing that it only occurs with 10.10 RC, I caught a flash
of it while booting back into 9.10, so it may not be a regression and
just have been drowned out by https://bugs.launchpad.net/bugs/475704 .
However, I've never noticed it mixed in with that bug's noise before, so
the *continuous* complaining first observed must be a rare or new case.

What I did *not* do was properly check the logs under 9.10 to confirm
'that really happened' and I was not just seeing something left in the
framebuffer from the warm reboot.  I'll have to take a look next time
I'm near those machines.

** Description changed:

  Previous attempt to file resulted in a Launchpad timeout and lost screed, so here's the "talk-like-the-Micro-Machines-guy" version:
  10.10 RC i386 Linux ubuntu 2.6.35-22-generic #33-Ubuntu SMP Sun Sep 19 20:34:50 UTC 2010 i686 GNU/Linux

  dmesg clogs with:
  [  326.566996] serial8250: too much work for irq17
  [  326.580318] serial8250: too much work for irq17
  [  326.593635] serial8250: too much work for irq17
  [  326.606966] serial8250: too much work for irq17
  [  326.620285] serial8250: too much work for irq17
  [  326.633606] serial8250: too much work for irq17
  oddly only until:
  [  335.695389] serial8250: too much work for irq17
+ on the boot I was reporting from; see comment #2 re: noticing this at all because it was ongoing under a different session and drowning out dmesg.

  Hardware:  Compaq SR1611NX desktop

- Not a problem under 9.10 using 2.6.31-22-generic #65-Ubuntu SMP Thu Sep
- 16 15:48:58 UTC 2010 i686 GNU/Linux
+ Never observed as a continuous problem under 9.10 using
+ 2.6.31-22-generic #65-Ubuntu SMP Thu Sep 16 15:48:58 UTC 2010 i686
+ GNU/Linux ; noise from https://bugs.launchpad.net/bugs/475704 may have
+ blocked ever noticing a short burst as above.

  All SR1611NXs put the modem, radeon, and AC97 controller on IRQ17;
  Forum folklore suggests pulling the modem could be the mindless fix but that would be annoying across multiple machines.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: linux-image-2.6.35-22-generic 2.6.35-22.33
  Regression: Yes
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
  Uname: Linux 2.6.35-22-generic i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: i386
  ArecordDevices:
-  **** List of CAPTURE Hardware Devices ****
-  card 0: IXP [ATI IXP], device 0: ATI IXP AC97 [ATI IXP AC97]
-    Subdevices: 1/1
-    Subdevice #0: subdevice #0
+  **** List of CAPTURE Hardware Devices ****
+  card 0: IXP [ATI IXP], device 0: ATI IXP AC97 [ATI IXP AC97]
+    Subdevices: 1/1
+    Subdevice #0: subdevice #0
  AudioDevicesInUse:
-  Cannot stat file /proc/4366/fd/40: Stale NFS file handle
-                       USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  ubuntu     2885 F.... pulseaudio
+  Cannot stat file /proc/4366/fd/40: Stale NFS file handle
+                       USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  ubuntu     2885 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
-  Card hw:0 'IXP'/'ATI IXP rev 2 with ALC658D at 0xfe02a000, irq 17'
-    Mixer name	: 'Realtek ALC658D'
-    Components	: 'AC97a:414c4781'
-    Controls      : 38
-    Simple ctrls  : 24
+  Card hw:0 'IXP'/'ATI IXP rev 2 with ALC658D at 0xfe02a000, irq 17'
+    Mixer name	: 'Realtek ALC658D'
+    Components	: 'AC97a:414c4781'
+    Controls      : 38
+    Simple ctrls  : 24
  Date: Sat Oct  2 01:46:01 2010
  IwConfig:
-  lo        no wireless extensions.
-  
-  eth0      no wireless extensions.
+  lo        no wireless extensions.
+ 
+  eth0      no wireless extensions.
  LiveMediaBuild: Ubuntu 10.10 "Maverick Meerkat" - Release Candidate i386 (20100928)
  MachineType: Compaq Presario 061 ED866AA-ABA SR1611NX NA541
  ProcCmdLine: file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  ProcEnviron:
-  PATH=(custom, no user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  PATH=(custom, no user)
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.38
  RfKill:
-  0: hci0: Bluetooth
-  	Soft blocked: no
-  	Hard blocked: no
+  0: hci0: Bluetooth
+   Soft blocked: no
+   Hard blocked: no
  SourcePackage: linux
  dmi.bios.date: 01/25/2007
  dmi.bios.vendor: Phoenix Technologies, LTD
  dmi.bios.version: 3.15
  dmi.board.name: Amberine M
  dmi.board.vendor: ASUSTek Computer INC.
  dmi.board.version: 1.03
  dmi.chassis.type: 3
  dmi.chassis.version: 1111
  dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr3.15:bd01/25/2007:svnCompaqPresario061:pnED866AA-ABASR1611NXNA541:pvr0nx1411RE101AMBEM00:rvnASUSTekComputerINC.:rnAmberineM:rvr1.03:cvn:ct3:cvr1111:
  dmi.product.name: ED866AA-ABA SR1611NX NA541
  dmi.product.version: 0nx1411RE101AMBEM00
  dmi.sys.vendor: Compaq Presario 061

-- 
10.10 RC: serial8250: too much work for irq (Motorola SM56 modem, RS480, SB400)
https://bugs.launchpad.net/bugs/653388
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