From: Dave Anderson <anderson@redhat.com>
To: kexec@lists.infradead.org
Subject: Re: [PATCH 1/3 v4] x86/kdump: always reserve the low 1MiB when the crashkernel option is specified
Date: Tue, 22 Oct 2019 09:38:03 -0400 (EDT) [thread overview]
Message-ID: <1711321633.7795678.1571751483859.JavaMail.zimbra@redhat.com> (raw)
In-Reply-To: <mailman.5359.1571746554.2486.kexec@lists.infradead.org>
----- Original Message -----
> >
> > [root linux]$ crash vmlinux
> > /var/crash/127.0.0.1-2019-09-19-08\:31\:27/vmcore
> > WARNING: kernel relocated [240MB]: patching 97110 gdb minimal_symbol values
> >
> > KERNEL: /var/crash/127.0.0.1-2019-09-19-08:31:27/vmlinux
> > DUMPFILE: /var/crash/127.0.0.1-2019-09-19-08:31:27/vmcore [PARTIAL DUMP]
> > CPUS: 128
> > DATE: Thu Sep 19 08:31:18 2019
> > UPTIME: 00:01:21
> > LOAD AVERAGE: 0.16, 0.07, 0.02
> > TASKS: 1343
> > NODENAME: amd-ethanol
> > RELEASE: 5.3.0-rc7+
> > VERSION: #4 SMP Thu Sep 19 08:14:00 EDT 2019
> > MACHINE: x86_64 (2195 Mhz)
> > MEMORY: 127.9 GB
> > PANIC: "Kernel panic - not syncing: sysrq triggered crash"
> > PID: 9789
> > COMMAND: "bash"
> > TASK: "ffff89711894ae80 [THREAD_INFO: ffff89711894ae80]"
> > CPU: 83
> > STATE: TASK_RUNNING (PANIC)
> >
> > crash> kmem -s|grep -i invalid
> > kmem: dma-kmalloc-512: slab:ffffd77680001c00 invalid freepointer:a6086ac099f0c5a4
> > kmem: dma-kmalloc-512: slab:ffffd77680001c00 invalid freepointer:a6086ac099f0c5a4
> > crash>
>
> I fail to see what that's trying to tell me? You have invalid pointers?
Correct, because the pointer values are encrypted. The command is walking through the
singly-linked list of free objects in a slab from the dma-kmalloc-512 slab cache. The
slab memory had been allocated from low memory, and because of the problem at hand,
it was was copied to the vmcore in its encrypted state.
Dave
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next parent reply other threads:[~2019-10-22 13:38 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.5359.1571746554.2486.kexec@lists.infradead.org>
2019-10-22 13:38 ` Dave Anderson [this message]
[not found] <55902207.7797907.1571751831873.JavaMail.zimbra@redhat.com>
2019-10-22 13:43 ` [PATCH 1/3 v4] x86/kdump: always reserve the low 1MiB when the crashkernel option is specified Dave Anderson
2019-10-17 9:43 [PATCH 0/3 v4] x86/kdump: Fix 'kmem -s' reported an invalid freepointer when SME was active Lianbo Jiang
2019-10-17 9:43 ` [PATCH 1/3 v4] x86/kdump: always reserve the low 1MiB when the crashkernel option is specified Lianbo Jiang
2019-10-17 9:43 ` Lianbo Jiang
2019-10-22 8:30 ` Borislav Petkov
2019-10-22 8:30 ` Borislav Petkov
2019-10-23 5:23 ` lijiang
2019-10-23 5:23 ` lijiang
2019-10-23 7:43 ` Borislav Petkov
2019-10-23 7:43 ` Borislav Petkov
2019-10-23 5:35 ` lijiang
2019-10-23 5:35 ` lijiang
2019-10-23 7:46 ` Borislav Petkov
2019-10-23 7:46 ` Borislav Petkov
2019-10-23 9:20 ` lijiang
2019-10-23 9:20 ` lijiang
2019-10-24 8:13 ` d.hatayama
2019-10-24 8:13 ` d.hatayama
2019-10-24 9:10 ` Borislav Petkov
2019-10-24 9:10 ` Borislav Petkov
2019-10-24 11:24 ` lijiang
2019-10-24 11:24 ` lijiang
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