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[Bug runtime/13210] New: vdso runtime tracking is broken
- From: "mjw at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sourceware dot org
- Date: Wed, 21 Sep 2011 10:37:58 +0000
- Subject: [Bug runtime/13210] New: vdso runtime tracking is broken
- Auto-submitted: auto-generated
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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