* [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) [...] -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. ^ permalink raw reply [flat|nested] 3+ messages in thread
* [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. -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. ^ permalink raw reply [flat|nested] 3+ messages in thread
* [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. -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2011-09-27 15:10 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 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
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