[Bug 1557673] Re: systemtap does not work on xenial, struct module changes

[Louis Bouchard]

** Tags removed: sts-sru

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Title:
  systemtap does not work on xenial, struct module changes

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[Bug 1557673] Re: systemtap does not work on xenial, struct module changes

[Yang Wei]

sudo dpkg -l | grep systemtap
ii  systemtap   2.3-1ubuntu1.4  
   amd64instrumentation system for Linux
ii  systemtap-common2.3-1ubuntu1.4  
   all  instrumentation system for Linux (common 
component)
ii  systemtap-runtime   2.3-1ubuntu1.4  
   amd64instrumentation system for Linux (runtime 
component)
ii  systemtap-sdt-dev   2.3-1ubuntu1
   amd64statically defined probes development files

➜  cv uname -r
4.4.0-21-generic

The latest systemtap package is still not fixed until now.

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Title:
  systemtap does not work on xenial, struct module changes

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[Bug 1557673] Re: systemtap does not work on xenial, struct module changes

[Yang Wei]

I am using Trusty, so when is it fixed on Trusty?

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  systemtap does not work on xenial, struct module changes

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[Bug 1557673] Re: systemtap does not work on xenial, struct module changes

[Launchpad Bug Tracker]

This bug was fixed in the package systemtap - 2.9-2ubuntu2

---
systemtap (2.9-2ubuntu2) xenial; urgency=medium

  * d/p/0001-Fix-PR9497-by-updating-the-runtime-to-handle-linux-4.patch:
Fix stap compilation after kernel 4.4 commit 7523e4dc50. (LP: #1557673)

 -- Dan Streetman   Wed, 16 Mar 2016
18:46:37 +

** Changed in: systemtap (Ubuntu Xenial)
   Status: In Progress => Fix Released

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  systemtap does not work on xenial, struct module changes

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[Bug 1557673] Re: systemtap does not work on xenial, struct module changes

[Brian Murray]

** Tags added: xenial

** Also affects: systemtap (Ubuntu Xenial)
   Importance: High
 Assignee: Dan Streetman (ddstreet)
   Status: In Progress

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  systemtap does not work on xenial, struct module changes

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[Bug 1557673] Re: systemtap does not work on xenial, struct module changes

[Mathew Hodson]

** Changed in: systemtap (Ubuntu)
   Importance: Undecided => High

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[Bug 1557673] Re: systemtap does not work on xenial, struct module changes

[Frank Ch. Eigler]

> does that cover wily also?

Pre-release systemtap is also being tested with pre-release 4.6 linux, so 
should work fine on wily etc.
I can only speak as upstream, not for ubuntu packaging though.

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  systemtap does not work on xenial, struct module changes

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[Bug 1557673] Re: systemtap does not work on xenial, struct module changes

[Dan Streetman]

** Description changed:

- Systemtap doesn't work on xenial, due to changes in struct module in the
- kernel:
+ [Impact]
  
- ubuntu@xenial:~$ sudo stap test.stap 
+ Attempting to use systemtap on xenial with the 4.4 kernel results in:
+ 
+ ubuntu@xenial:~$ sudo stap test.stap
  In file included from /usr/share/systemtap/runtime/print.c:17:0,
-  from /usr/share/systemtap/runtime/runtime_context.h:22,
-  from 
/tmp/stapxvNfgC/stap_2e27f5927a5796b18cb7b3c2abd24ec4_812_src.c:50:
+  from /usr/share/systemtap/runtime/runtime_context.h:22,
+  from 
/tmp/stapxvNfgC/stap_2e27f5927a5796b18cb7b3c2abd24ec4_812_src.c:50:
  /usr/share/systemtap/runtime/linux/print.c: In function 
‘_stp_print_kernel_info’:
  /usr/share/systemtap/runtime/linux/print.c:242:20: error: ‘struct module’ has 
no member named ‘module_core’
-  THIS_MODULE->module_core,
- ^
+  THIS_MODULE->module_core,
+ ^
  /usr/share/systemtap/runtime/linux/print.c:243:37: error: ‘struct module’ has 
no member named ‘core_size’
-  (unsigned long) (THIS_MODULE->core_size - 
THIS_MODULE->core_text_size)/1024,
-  ^
+  (unsigned long) (THIS_MODULE->core_size - 
THIS_MODULE->core_text_size)/1024,
+  ^
  /usr/share/systemtap/runtime/linux/print.c:243:62: error: ‘struct module’ has 
no member named ‘core_text_size’
-  (unsigned long) (THIS_MODULE->core_size - 
THIS_MODULE->core_text_size)/1024,
-   ^
+  (unsigned long) (THIS_MODULE->core_size - 
THIS_MODULE->core_text_size)/1024,
+   ^
  /usr/share/systemtap/runtime/linux/print.c:244:44: error: ‘struct module’ has 
no member named ‘core_text_size’
- (unsigned long) (THIS_MODULE->core_text_size)/1024,
- ^
+ (unsigned long) (THIS_MODULE->core_text_size)/1024,
+ ^
  scripts/Makefile.build:258: recipe for target 
'/tmp/stapxvNfgC/stap_2e27f5927a5796b18cb7b3c2abd24ec4_812_src.o' failed
  make[1]: *** 
[/tmp/stapxvNfgC/stap_2e27f5927a5796b18cb7b3c2abd24ec4_812_src.o] Error 1
  Makefile:1396: recipe for target '_module_/tmp/stapxvNfgC' failed
  make: *** [_module_/tmp/stapxvNfgC] Error 2
  WARNING: kbuild exited with status: 2
  Pass 4: compilation failed.  [man error::pass4]
  Tip: /usr/share/doc/systemtap/README.Debian should help you get started.
+ 
+ [Test Case]
+ 
+ on a xenial system with the 4.4 kernel installed, and systemtap and
+ kernel dbgsyms installed, simply create a dummy stap script and try to
+ run it, e.g.:
+ 
+ $ cat test.stap 
+ #!/usr/bin/stap
+ 
+ probe begin {
+   println("hello")
+ }
+ $ sudo stap test.stap
+ 
+ the above compilation failure will result.
+ 
+ [Regression Potential]
+ 
+ The commit updates stap to use the kernel module header correctly based
+ on a small test program, so there should be no regression, but possible
+ regression is breaking stap on the xenial 4.3 kernel.
+ 
+ [Other Info]
+ 
+ this requires upstream stap commit
+ 3f040971e7efb4d323fcb63d83b4337f355c60db

** Tags removed: bot-stop-nagging
** Tags added: sts-sru

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  systemtap does not work on xenial, struct module changes

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[Bug 1557673] Re: systemtap does not work on xenial, struct module changes

[Ubuntu Foundations Team Bug Bot]

The attachment "lp1557673.debdiff" seems to be a debdiff.  The ubuntu-
sponsors team has been subscribed to the bug report so that they can
review and hopefully sponsor the debdiff.  If the attachment isn't a
patch, please remove the "patch" flag from the attachment, remove the
"patch" tag, and if you are member of the ~ubuntu-sponsors, unsubscribe
the team.

[This is an automated message performed by a Launchpad user owned by
~brian-murray, for any issue please contact him.]

** Tags added: patch

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  systemtap does not work on xenial, struct module changes

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[Bug 1557673] Re: systemtap does not work on xenial, struct module changes

[Dan Streetman]

debdiff with backported systemtap upstream commit
3f040971e7efb4d323fcb63d83b4337f355c60db.

Note the upstream commit also changes tapset/linux/context.stp, but the
current xenial systemtap source does not include other commits that
require this patch to update context.stp, so I removed the context.stp
section of the patch.

** Patch added: "lp1557673.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/systemtap/+bug/1557673/+attachment/4601396/+files/lp1557673.debdiff

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  systemtap does not work on xenial, struct module changes

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[Bug 1557673] Re: systemtap does not work on xenial, struct module changes

[Dan Streetman]

> Upstream commit 3f040971e7e should fix this.

yep

> (Also, we plan to have a systemtap 3.0 release shortly, with this and
other fixes.)

great; does that cover wily also?  because this is broken there also
with wily/lts-xenial kernel.  (As well as lp bug 1547644.)

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[Bug 1557673] Re: systemtap does not work on xenial, struct module changes

[Frank Ch. Eigler]

Upstream commit 3f040971e7e should fix this.
(Also, we plan to have a systemtap 3.0 release shortly, with this and other 
fixes.)

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[Bug 1557673] Re: systemtap does not work on xenial, struct module changes

[Dan Streetman]

** Changed in: systemtap (Ubuntu)
 Assignee: (unassigned) => Dan Streetman (ddstreet)

** Changed in: systemtap (Ubuntu)
   Status: New => In Progress

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  systemtap does not work on xenial, struct module changes

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