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[Bug 1523606] Re: Incompatibility with 4.2 prints: crash: page excluded: kernel virtual address: ffff88105b1a0000 type: "fill_task_struct"

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** Description changed:

  [Impact]
  
    * Crash prints
  "crash: page excluded: kernel virtual address: ffff8808595a0000  type: "fill_task_struct" "
        on dumps for 4.2 and newer levels of the kernel.
+   * This is related to variable task_struct_size being variable on 4.2 and newer kernels.
  
  [Test Case]
  
  An example of the issue.
  $ crash ddeb/usr/lib/debug/boot/vmlinux-4.2.0-18-generic 00092116-dump.201511300126
  
  crash 7.0.3
  Copyright (C) 2002-2013  Red Hat, Inc.
  Copyright (C) 2004, 2005, 2006, 2010  IBM Corporation
  Copyright (C) 1999-2006  Hewlett-Packard Co
  Copyright (C) 2005, 2006, 2011, 2012  Fujitsu Limited
  Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
  Copyright (C) 2005, 2011  NEC Corporation
  Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
  Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
  This program is free software, covered by the GNU General Public License,
  and you are welcome to change it and/or distribute copies of it under
  certain conditions.  Enter "help copying" to see the conditions.
  This program has absolutely no warranty.  Enter "help warranty" for details.
  
  GNU gdb (GDB) 7.6
  Copyright (C) 2013 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
  and "show warranty" for details.
  This GDB was configured as "x86_64-unknown-linux-gnu"...
  
  please wait... (gathering task table data)
  crash: page excluded: kernel virtual address: ffff88105b1a0000  type: "fill_task_struct"
  
  crash: page excluded: kernel virtual address: ffff881052fa8000  type:
  "fill_task_struct"
  
  crash: page excluded: kernel virtual address: ffff880111770000  type:
  "fill_task_struct"
  
  crash: page excluded: kernel virtual address: ffff880836578000  type:
  "fill_task_struct"
  
  crash: page excluded: kernel virtual address: ffff880859e68000  type:
  "fill_task_struct"
  
  crash: page excluded: kernel virtual address: ffff88085b858000  type:
  "fill_task_struct"
  
  crash: page excluded: kernel virtual address: ffff88084c448000  type:
  "fill_task_struct"
  
  crash: page excluded: kernel virtual address: ffff88105b530000  type:
  "fill_task_struct"
  
  crash: page excluded: kernel virtual address: ffff8808595a0000  type:
  "fill_task_struct"
  
  crash: page excluded: kernel virtual address: ffff8801065a0000  type:
  "fill_task_struct"
  
  crash: page excluded: kernel virtual address: ffff8808488d0000  type:
  "fill_task_struct"
  
  crash: page excluded: kernel virtual address: ffff880859dd0000  type:
  "fill_task_struct"
  
  crash: page excluded: kernel virtual address: ffff880855750000  type:
  "fill_task_struct"
  
  crash: page excluded: kernel virtual address: ffff881058cd0000  type:
  "fill_task_struct"
  
  crash: page excluded: kernel virtual address: ffff880bb5150000  type: "fill_task_struct"
        KERNEL: ddeb/usr/lib/debug/boot/vmlinux-4.2.0-18-generic
      DUMPFILE: 00092116-dump.201511300126  [PARTIAL DUMP]
          CPUS: 24
          DATE: Thu Jan  1 00:00:00 1970
        UPTIME: 3 days, 13:28:22
  LOAD AVERAGE: 528.67, 526.12, 465.03
         TASKS: 1208
      NODENAME: <redacted>
       RELEASE: 4.2.0-18-generic
       VERSION: #22~14.04.1-Ubuntu SMP Fri Nov 6 22:20:11 UTC 2015
       MACHINE: x86_64  (2397 Mhz)
        MEMORY: 63.9 GB
         PANIC: "Kernel panic - not syncing: NMI IOCK error: Not continuing"
           PID: 0
       COMMAND: "swapper/0"
          TASK: ffffffff81c14500  (1 of 24)  [THREAD_INFO: ffffffff81c00000]
           CPU: 0
         STATE: TASK_RUNNING (PANIC)
  
  [Regression Potential]
- 
- [TBD]
-  * discussion of how regressions are most likely to manifest as a result of this change.
- 
-  * It is assumed that any SRU candidate patch is well-tested before
-    upload and has a low overall risk of regression, but it's important
-    to make the effort to think about what ''could'' happen in the
-    event of a regression.
- 
-  * This both shows the SRU team that the risks have been considered,
-    and provides guidance to testers in regression-testing the SRU.
+  * Change is available in upstream crash
+  * This has been tested with both 3.13 and 4.2 crash dumps.
  
  [Other Info]
  
- It looks like
- https://github.com/crash-utility/crash/commit/80b49a879e0ba8ce7c365a2fd88693128a79310f
+  * https://github.com/crash-utility/crash/commit/80b49a879e0ba8ce7c365a2fd88693128a79310f
  is the fix for this issue.
  
- Related conversation on mailing list.
+ * Related conversation on mailing list.
  https://www.redhat.com/archives/crash-utility/2015-November/msg00022.html

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https://bugs.launchpad.net/bugs/1523606

Title:
  Incompatibility with 4.2 prints:  crash: page excluded: kernel virtual
  address: ffff88105b1a0000  type: "fill_task_struct"

Status in crash package in Ubuntu:
  New
Status in crash source package in Trusty:
  New
Status in crash source package in Vivid:
  New
Status in crash source package in Wily:
  New
Status in crash source package in Xenial:
  New

Bug description:
  [Impact]

    * Crash prints
  "crash: page excluded: kernel virtual address: ffff8808595a0000  type: "fill_task_struct" "
        on dumps for 4.2 and newer levels of the kernel.
    * This is related to variable task_struct_size being variable on 4.2 and newer kernels.

  [Test Case]

  An example of the issue.
  $ crash ddeb/usr/lib/debug/boot/vmlinux-4.2.0-18-generic 00092116-dump.201511300126

  crash 7.0.3
  Copyright (C) 2002-2013  Red Hat, Inc.
  Copyright (C) 2004, 2005, 2006, 2010  IBM Corporation
  Copyright (C) 1999-2006  Hewlett-Packard Co
  Copyright (C) 2005, 2006, 2011, 2012  Fujitsu Limited
  Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
  Copyright (C) 2005, 2011  NEC Corporation
  Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
  Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
  This program is free software, covered by the GNU General Public License,
  and you are welcome to change it and/or distribute copies of it under
  certain conditions.  Enter "help copying" to see the conditions.
  This program has absolutely no warranty.  Enter "help warranty" for details.

  GNU gdb (GDB) 7.6
  Copyright (C) 2013 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
  and "show warranty" for details.
  This GDB was configured as "x86_64-unknown-linux-gnu"...

  please wait... (gathering task table data)
  crash: page excluded: kernel virtual address: ffff88105b1a0000  type: "fill_task_struct"

  crash: page excluded: kernel virtual address: ffff881052fa8000  type:
  "fill_task_struct"

  crash: page excluded: kernel virtual address: ffff880111770000  type:
  "fill_task_struct"

  crash: page excluded: kernel virtual address: ffff880836578000  type:
  "fill_task_struct"

  crash: page excluded: kernel virtual address: ffff880859e68000  type:
  "fill_task_struct"

  crash: page excluded: kernel virtual address: ffff88085b858000  type:
  "fill_task_struct"

  crash: page excluded: kernel virtual address: ffff88084c448000  type:
  "fill_task_struct"

  crash: page excluded: kernel virtual address: ffff88105b530000  type:
  "fill_task_struct"

  crash: page excluded: kernel virtual address: ffff8808595a0000  type:
  "fill_task_struct"

  crash: page excluded: kernel virtual address: ffff8801065a0000  type:
  "fill_task_struct"

  crash: page excluded: kernel virtual address: ffff8808488d0000  type:
  "fill_task_struct"

  crash: page excluded: kernel virtual address: ffff880859dd0000  type:
  "fill_task_struct"

  crash: page excluded: kernel virtual address: ffff880855750000  type:
  "fill_task_struct"

  crash: page excluded: kernel virtual address: ffff881058cd0000  type:
  "fill_task_struct"

  crash: page excluded: kernel virtual address: ffff880bb5150000  type: "fill_task_struct"
        KERNEL: ddeb/usr/lib/debug/boot/vmlinux-4.2.0-18-generic
      DUMPFILE: 00092116-dump.201511300126  [PARTIAL DUMP]
          CPUS: 24
          DATE: Thu Jan  1 00:00:00 1970
        UPTIME: 3 days, 13:28:22
  LOAD AVERAGE: 528.67, 526.12, 465.03
         TASKS: 1208
      NODENAME: <redacted>
       RELEASE: 4.2.0-18-generic
       VERSION: #22~14.04.1-Ubuntu SMP Fri Nov 6 22:20:11 UTC 2015
       MACHINE: x86_64  (2397 Mhz)
        MEMORY: 63.9 GB
         PANIC: "Kernel panic - not syncing: NMI IOCK error: Not continuing"
           PID: 0
       COMMAND: "swapper/0"
          TASK: ffffffff81c14500  (1 of 24)  [THREAD_INFO: ffffffff81c00000]
           CPU: 0
         STATE: TASK_RUNNING (PANIC)

  [Regression Potential]
   * Change is available in upstream crash
   * This has been tested with both 3.13 and 4.2 crash dumps.

  [Other Info]

   * https://github.com/crash-utility/crash/commit/80b49a879e0ba8ce7c365a2fd88693128a79310f
  is the fix for this issue.

  * Related conversation on mailing list.
  https://www.redhat.com/archives/crash-utility/2015-November/msg00022.html

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