* [Bug runtime/13210] New: vdso runtime tracking is broken
@ 2011-09-21 10:38 mjw at redhat dot com
2011-09-21 10:48 ` [Bug runtime/13210] " mjw at redhat dot com
2011-09-27 15:10 ` mjw at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: mjw at redhat dot com @ 2011-09-21 10:38 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=13210
Bug #: 13210
Summary: vdso runtime tracking is broken
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: runtime
AssignedTo: systemtap@sourceware.org
ReportedBy: mjw@redhat.com
Classification: Unclassified
vdso tracking is broken, which means user backtraces of kernel probes that get
accessed through the vdso are broken (since they cannot unwind through the
vdso).
This seems to be caused by buildid checking, which always fails.
-DDEBUG_TASK_FINDER_VMA will show:
_stp_vma_init:211: registering vmcb (_stap_target: 32045)
_stp_vma_exec_cb:88: tsk 32045:32045 , register_p: 1, process_p: 1
_stp_vma_match_vdso:32: tsk: 32045 vdso: 0x2c5000
_stp_vma_match_vdso:44: notes_addr vdso32-int80.so: 0x2c51d8
_stp_vma_match_vdso:57: darn, not equal (rc=0) at 0 (40 != 132)
[...]
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* [Bug runtime/13210] vdso runtime tracking is broken
2011-09-21 10:38 [Bug runtime/13210] New: vdso runtime tracking is broken mjw at redhat dot com
@ 2011-09-21 10:48 ` mjw at redhat dot com
2011-09-27 15:10 ` mjw at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: mjw at redhat dot com @ 2011-09-21 10:48 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=13210
--- Comment #1 from Mark Wielaard <mjw at redhat dot com> 2011-09-21 10:47:31 UTC ---
Added a testcase for this that uses umodname(uaddr()) to check whether the vma
tracker at least got the name (of either the vdso or another vma that initiated
the syscall).
commit d0d7bd5fd8ebe136c7afca43e157f04c1abed243
Author: Mark Wielaard <mjw@redhat.com>
Date: Wed Sep 21 12:38:24 2011 +0200
PR13210 vma/vdso tracking is broken testcase
Add a generic testcase to see if we can track the vma from which a syscall
was made. This might or might not come in through the vdso on the
particular
(compat) arch, but should always at least be able to get the vma name.
Currently it fails some of the tests in different ways for different arches
and/or kernel versions.
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* [Bug runtime/13210] vdso runtime tracking is broken
2011-09-21 10:38 [Bug runtime/13210] New: vdso runtime tracking is broken mjw at redhat dot com
2011-09-21 10:48 ` [Bug runtime/13210] " mjw at redhat dot com
@ 2011-09-27 15:10 ` mjw at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: mjw at redhat dot com @ 2011-09-27 15:10 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=13210
Mark Wielaard <mjw at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #2 from Mark Wielaard <mjw at redhat dot com> 2011-09-27 15:09:54 UTC ---
commit 31d50137fa93d9ff81d76584a870e664c0e3560a
Author: Mark Wielaard <mjw@redhat.com>
Date: Tue Sep 27 16:21:15 2011 +0200
_stp_vma_match_vdso: Don't subtract build_id_len from notes_addr.
Older (pre-0.138) elfutils would erroneously return the address of the
build id note address with the length added. Newer ones never do this.
And we only support elfutils 0.142+ now anyway. Fixes vma_vdso.exp.
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