Bug 1312738
| Summary: | crash: zero-size memory allocation (aarch64) | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | XiaoNi <xni> |
| Component: | crash | Assignee: | Dave Anderson <anderson> |
| Status: | CLOSED ERRATA | QA Contact: | Emma Wu <xiawu> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 7.3 | CC: | anderson, dwysocha, jbastian, qzhao, ruyang, xiawu |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | aarch64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | crash-7.1.5-1.el7 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2016-11-04 03:46:23 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Comment 2
Dave Anderson
2016-02-29 14:02:28 UTC
> Are you sure?
Ah, I see that in your example you used a vmcore file, so that is presumably
the reason for the type of failure seen. I don't know where the vmcore file
is located on hp-moonshot-02-c11.khw.lab.eng.bos.redhat.com.
(In reply to Dave Anderson from comment #3) > > Are you sure? > > Ah, I see that in your example you used a vmcore file, so that is presumably > the reason for the type of failure seen. I don't know where the vmcore file > is located on hp-moonshot-02-c11.khw.lab.eng.bos.redhat.com. Hi Dave Sorry for the late response. I didn't see the emails. The vmcore is under /var/crash/hp-moonshot-02-c11.khw.lab.eng.bos.redhat.com-yizhan-1239074/10.16.184.139-2016-02-27-14:41:34 Thanks Xiao hp-moonshot-02-c11.khw.lab.eng.bos.redhat.com did not respond to a ping, so I tried accessing it via the console server. It looks like it's doing a complete system reinstallation. OK thanks. For a sanity check, tested here is the upstream git repo version of the crash utility: # ./crash /usr/lib/debug/lib/modules/4.5.0-0.rc5.29.el7.aarch64/vmlinux /var/crash/amd-seattle-06.khw.lab.eng.bos.redhat.com-yizhan-1255595/10.16.184.109-2016-03-09-02:14:43/vmcore crash 7.1.5rc17 Copyright (C) 2002-2016 Red Hat, Inc. Copyright (C) 2004, 2005, 2006, 2010 IBM Corporation Copyright (C) 1999-2006 Hewlett-Packard Co Copyright (C) 2005, 2006, 2011, 2012 Fujitsu Limited Copyright (C) 2006, 2007 VA Linux Systems Japan K.K. Copyright (C) 2005, 2011 NEC Corporation Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc. Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc. This program is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Enter "help copying" to see the conditions. This program has absolutely no warranty. Enter "help warranty" for details. GNU gdb (GDB) 7.6 Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "aarch64-unknown-linux-gnu"... KERNEL: /usr/lib/debug/lib/modules/4.5.0-0.rc5.29.el7.aarch64/vmlinux DUMPFILE: /var/crash/amd-seattle-06.khw.lab.eng.bos.redhat.com-yizhan-1255595/10.16.184.109-2016-03-09-02:14:43/vmcore [PARTIAL DUMP] CPUS: 8 [OFFLINE: 7] DATE: Tue Mar 8 21:14:03 2016 UPTIME: 00:20:46 LOAD AVERAGE: 5.93, 5.12, 4.06 TASKS: 249 NODENAME: amd-seattle-06.khw.lab.eng.bos.redhat.com RELEASE: 4.5.0-0.rc5.29.el7.aarch64 VERSION: #1 SMP Mon Feb 22 13:41:33 EST 2016 MACHINE: aarch64 (unknown Mhz) MEMORY: 16 GB PANIC: "Unable to handle kernel NULL pointer dereference at virtual address 000002a8" PID: 8213 COMMAND: "loop0" TASK: fffffe0000b0cb00 [THREAD_INFO: fffffe0000010000] CPU: 1 STATE: TASK_RUNNING (PANIC) crash> Hi Dave Thanks ;) I can use it now. Another question [ 1248.843392] PC is at super_written+0x34/0x94 [ 1248.847655] LR is at bio_endio+0x90/0xc4 What's meaning of the PC and LR. Is there a doc that I can learn about how to analyze the vmcore. Thanks Xiao The PC is the "program counter" register, which contains the address of the instruction that was running which generated the panic. So in the example above, while executing within the kernel's super_written() function, something occurred at super_written+0x34 that caused the system to panic. The LR is the "link register", which contains the address of the function that called super_written(). If you google for arm64 or aarch64, there are some documents that might be helpful. If you try amazon.com, though, there's pretty much nothing. It's frustrating because, for example, the i386, x86_64, ia64, and ppc64 arches all have full sets of paperback manuals. Thanks for the explanation. *** Bug 1325374 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://rhn.redhat.com/errata/RHBA-2016-2325.html |