| Summary: | RHEL7.5 - backtraces no longer work with systemtap but worked in RHEL7.4 - adding 'nokaslr' on kernel commandline makes them work again [rhel-7.5.z] | ||||||
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| Product: | Red Hat Enterprise Linux 7 | Reporter: | Oneata Mircea Teodor <toneata> | ||||
| Component: | systemtap | Assignee: | Frank Ch. Eigler <fche> | ||||
| Status: | CLOSED ERRATA | QA Contact: | Martin Cermak <mcermak> | ||||
| Severity: | unspecified | Docs Contact: | Vladimír Slávik <vslavik> | ||||
| Priority: | urgent | ||||||
| Version: | 7.5 | CC: | alanm, dsmith, dwysocha, fche, fsorenso, jistone, jmoyer, kwalker, lberk, mcermak, mjw, sjohnsto, smakarov, stalexan, tbecker, wcohen | ||||
| Target Milestone: | rc | Keywords: | Regression, ZStream | ||||
| Target Release: | --- | ||||||
| Hardware: | Unspecified | ||||||
| OS: | Unspecified | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | systemtap-3.2-8.el7_5 | Doc Type: | Bug Fix | ||||
| Doc Text: |
Because of changes in the kernel related to address space layout randomization (ASLR), kernel backtraces collected by the SystemTap tool were incomplete. SystemTap has been extended to handle this situation. As a result, SystemTap provides complete kernel backtraces.
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Story Points: | --- | ||||
| Clone Of: | 1567356 | Environment: | |||||
| Last Closed: | 2018-06-26 16:48:44 UTC | Type: | --- | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Bug Depends On: | 1567356 | ||||||
| Bug Blocks: | |||||||
| Attachments: |
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Description
Oneata Mircea Teodor
2018-04-27 07:28:35 UTC
*** Bug 1576845 has been marked as a duplicate of this bug. *** Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2018:1981 Created attachment 1537609 [details]
stap -DDEBUG_UNWIND=1 -DDEBUG_SYMBOLS -DDEBUG_TRANS --all-modules -vwe 'probe kernel.function("kmem_cache_alloc") { print_backtrace(); exit() }' >& stap_results.out
Set more debug variables for systemtap and another run with:
stap -DDEBUG_UNWIND=1 -DDEBUG_SYMBOLS -DDEBUG_TRANS --all-modules -vwe 'probe kernel.function("kmem_cache_alloc") { print_backtrace(); exit() }' >& stap_results.out
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