Re: [Crash-utility] Kernel Crash Analysis on Android
by Shankar, AmarX
Hi Dave,
Thanks for your info regarding kexec tool.
I am unable to download kexec from below link.
http://www.kernel.org/pub/linux/kernel/people/horms/kexec-tools/kexec-too...
It says HTTP 404 Page Not Found.
Could you please guide me on this?
Thanks & Regards,
Amar Shankar
> On Wed, Mar 21, 2012 at 06:00:00PM +0000, Shankar, AmarX wrote:
>
> > I want to do kernel crash Analysis on Android Merrifield Target.
> >
> > Could someone please help me how to do it?
>
> Merrifield is pretty much similar than Medfield, e.g it has x86 core. So I
> guess you can follow the instructions how to setup kdump on x86 (see
> Documentation/kdump/kdump.txt) unless you already have that configured.
>
> crash should support this directly presuming you have vmlinux/vmcore files to
> feed it. You can configure crash to support x86 on x86_64 host by running:
>
> % make target=X86
> & make
>
> (or something along those lines).
Right -- just the first make command will suffice, i.e., when running
on an x86_64 host:
$ wget http://people.redhat.com/anderson/crash-6.0.4.tar.gz
$ tar xzf crash-6.0.4.tar.gz
...
$ cd crash-6.0.4
$ make target=X86
...
$ ./crash <path-to>/vmlinux <path-to>/vmcore
Dave
From: Shankar, AmarX
Sent: Wednesday, March 21, 2012 11:30 PM
To: 'crash-utility(a)redhat.com'
Subject: Kernel Crash Analysis on Android
Hi,
I want to do kernel crash Analysis on Android Merrifield Target.
Could someone please help me how to do it?
Thanks & Regards,
Amar Shankar
1 year
[PATCH] kmem, snap: iomem/ioport display and vmcore snapshot support
by HATAYAMA Daisuke
Some days ago I was in a situation that I had to convert vmcore in
kvmdump format into ELF since some extension module we have locally
can be used only on relatively old crash utility, around version 4,
but such old crash utility cannot handle kvmdump format.
To do the conversion in handy, I used snap command with some modifications
so that it tries to use iomem information in vmcore instead of host's
/proc/iomem. This patch is its cleaned-up version.
In this development, I naturally got down to also making an interface
for an access to resource objects, and so together with the snap
command's patch, I also extended kmem command for iomem/ioport
support. Actually:
kmem -r displays /proc/iomem
crash> kmem -r
00000000-0000ffff : reserved
00010000-0009dbff : System RAM
0009dc00-0009ffff : reserved
000c0000-000c7fff : Video ROM
...
and kmem -R displays /proc/ioport
crash> kmem -R
0000-001f : dma1
0020-0021 : pic1
0040-0043 : timer0
0050-0053 : timer1
...
Looking into old version of kernel source code back, resource structure
has been unchanged since linux-2.4.0. I borrowed the way of walking on
resouce tree in this patch from the lastest v3.3-rc series, but I
guess the logic is also applicable to old kernels. I expect Dave's
regression testsuite.
Also, there would be another command more sutable for iomem/ioport.
If necessay, I'll repost the patch.
---
HATAYAMA Daisuke (4):
Add vmcore snapshot support
Add kmem -r and -R options
Add dump iomem/ioport functions; a helper for resource objects
Add a helper function for iterating resource objects
defs.h | 9 ++++
extensions/snap.c | 54 ++++++++++++++++++++++-
help.c | 2 +
memory.c | 122 +++++++++++++++++++++++++++++++++++++++++++++++++++--
4 files changed, 180 insertions(+), 7 deletions(-)
--
Thanks.
HATAYAMA Daisuke
1 year
Re: [Crash-utility] question about phys_base
by Dave Anderson
----- Original Message -----
> >
> > OK, so then I don't understand what you mean by "may be the same"?
> >
> > You didn't answer my original question, but if I understand you correctly,
> > it would be impossible for the qemu host to create a PT_LOAD segment that
> > describes an x86_64 guest's __START_KERNEL_map region, because the host
> > doesn't know that what kind of kernel the guest is running.
>
> Yes. Even if the guest is linux, it is still impossible to do it. Because
> the guest maybe in the second kernel.
>
> qemu-dump walks all guest's page table and collect virtual address and
> physical address mapping. If the page is not used by guest, the virtual is set
> to 0. I create PT_LOAD according to such mapping. So if the guest is linux,
> there may be a PT_LOAD segment that describes __START_KERNEL_map region.
> But the information stored in PT_LOAD maybe for the second kernel. If crash
> uses it, crash will see the second kernel, not the first kernel.
Just to be clear -- what do you mean by the "second" kernel? Do you
mean that a guest kernel crashed guest, and did a kdump operation,
and that second kdump kernel failed somehow, and now you're trying
to do a "virsh dump" on the kdump kernel?
Dave
1 year
question about phys_base
by Wen Congyang
Hi, Dave
I am implementing a new dump command in the qemu. The vmcore's
format is elf(like kdump). And I try to provide phys_base in
the PT_LOAD. But if the os uses the first vcpu do kdump, the
value of phys_base is wrong.
I find a function x86_64_virt_phys_base() in crash's code.
Is it OK to call this function first? If the function
successes, we do not calculate phys_base according to PT_LOAD.
Thanks
Wen Congyang
1 year
[PATCH] runq: search current task's runqueue explicitly
by HATAYAMA Daisuke
Currently, runq sub-command doesn't consider CFS runqueue's current
task removed from CFS runqueue. Due to this, the remaining CFS
runqueus that follow the current task's is not displayed. This patch
fixes this by making runq sub-command search current task's runqueue
explicitly.
Note that CFS runqueue exists for each task group, and so does CFS
runqueue's current task, and the above search needs to be done
recursively.
Test
====
On vmcore I made 7 task groups:
root group --- A --- AA --- AAA
+ +- AAB
|
+- AB --- ABA
+- ABB
and then I ran three CPU bound tasks, which is exactly the same as
int main(void) { for (;;) continue; return 0; }
for each task group, including root group; so total 24 tasks. For
readability, I annotated each task name with its belonging group name.
For example, loop.ABA belongs to task group ABA.
Look at CPU0 collumn below. [before] lacks 8 tasks and [after]
successfully shows all tasks on the runqueue, which is identical to
the result of [sched debug] that is expected to ouput correct result.
I'll send this vmcore later.
[before]
crash> runq | cat
CPU 0 RUNQUEUE: ffff88000a215f80
CURRENT: PID: 28263 TASK: ffff880037aaa040 COMMAND: "loop.ABA"
RT PRIO_ARRAY: ffff88000a216098
[no tasks queued]
CFS RB_ROOT: ffff88000a216010
[120] PID: 28262 TASK: ffff880037cc40c0 COMMAND: "loop.ABA"
<cut>
[after]
crash_fix> runq
CPU 0 RUNQUEUE: ffff88000a215f80
CURRENT: PID: 28263 TASK: ffff880037aaa040 COMMAND: "loop.ABA"
RT PRIO_ARRAY: ffff88000a216098
[no tasks queued]
CFS RB_ROOT: ffff88000a216010
[120] PID: 28262 TASK: ffff880037cc40c0 COMMAND: "loop.ABA"
[120] PID: 28271 TASK: ffff8800787a8b40 COMMAND: "loop.ABB"
[120] PID: 28272 TASK: ffff880037afd580 COMMAND: "loop.ABB"
[120] PID: 28245 TASK: ffff8800785e8b00 COMMAND: "loop.AB"
[120] PID: 28246 TASK: ffff880078628ac0 COMMAND: "loop.AB"
[120] PID: 28241 TASK: ffff880078616b40 COMMAND: "loop.AA"
[120] PID: 28239 TASK: ffff8800785774c0 COMMAND: "loop.AA"
[120] PID: 28240 TASK: ffff880078617580 COMMAND: "loop.AA"
[120] PID: 28232 TASK: ffff880079b5d4c0 COMMAND: "loop.A"
<cut>
[sched debug]
crash> runq -d
CPU 0
[120] PID: 28232 TASK: ffff880079b5d4c0 COMMAND: "loop.A"
[120] PID: 28239 TASK: ffff8800785774c0 COMMAND: "loop.AA"
[120] PID: 28240 TASK: ffff880078617580 COMMAND: "loop.AA"
[120] PID: 28241 TASK: ffff880078616b40 COMMAND: "loop.AA"
[120] PID: 28245 TASK: ffff8800785e8b00 COMMAND: "loop.AB"
[120] PID: 28246 TASK: ffff880078628ac0 COMMAND: "loop.AB"
[120] PID: 28262 TASK: ffff880037cc40c0 COMMAND: "loop.ABA"
[120] PID: 28263 TASK: ffff880037aaa040 COMMAND: "loop.ABA"
[120] PID: 28271 TASK: ffff8800787a8b40 COMMAND: "loop.ABB"
[120] PID: 28272 TASK: ffff880037afd580 COMMAND: "loop.ABB"
<cut>
Diff stat
=========
defs.h | 1 +
task.c | 37 +++++++++++++++++--------------------
2 files changed, 18 insertions(+), 20 deletions(-)
Thanks.
HATAYAMA, Daisuke
1 year
[RFC] makedumpfile, crash: LZO compression support
by HATAYAMA Daisuke
Hello,
This is a RFC patch set that adds LZO compression support to
makedumpfile and crash utility. LZO is as good as in size but by far
better in speed than ZLIB, leading to reducing down time during
generation of crash dump and refiltering.
How to build:
1. Get LZO library, which is provided as lzo-devel package on recent
linux distributions, and is also available on author's website:
http://www.oberhumer.com/opensource/lzo/.
2. Apply the patch set to makedumpfile v1.4.0 and crash v6.0.0.
3. Build both using make. But for crash, do the following now:
$ make CFLAGS="-llzo2"
How to use:
I've newly used -l option for lzo compression in this patch. So for
example, do as follows:
$ makedumpfile -l vmcore dumpfile
$ crash vmlinux dumpfile
Request of configure-like feature for crash utility:
I would like configure-like feature on crash utility for users to
select wheather to add LZO feature actually or not in build-time,
that is: ./configure --enable-lzo or ./configure --disable-lzo.
The reason is that support staff often downloads and installs the
latest version of crash utility on machines where lzo library is not
provided.
Looking at the source code, it looks to me that crash does some kind
of configuration processing in a local manner, around configure.c,
and I guess it's difficult to use autoconf tools directly.
Or is there another better way?
Performance Comparison:
Sample Data
Ideally, I must have measured the performance for many enough
vmcores generated from machines that was actually running, but now
I don't have enough sample vmcores, I couldn't do so. So this
comparison doesn't answer question on I/O time improvement. This
is TODO for now.
Instead, I choosed worst and best cases regarding compression
ratio and speed only. Specifically, the former is /dev/urandom and
the latter is /dev/zero.
I get the sample data of 10MB, 100MB and 1GB by doing like this:
$ dd bs=4096 count=$((1024*1024*1024/4096)) if=/dev/urandom of=urandom.1GB
How to measure
Then I performed compression for each block, 4096 bytes, and
measured total compression time and output size. See attached
mycompress.c.
Result
See attached file result.txt.
Discussion
For both kinds of data, lzo's compression was considerably quicker
than zlib's. Compression ratio is about 37% for urandom data, and
about 8.5% for zero data. Actual situation of physical memory
would be in between the two cases, and so I guess average
compression time ratio is between 37% and 8.5%.
Although beyond the topic of this patch set, we can estimate worst
compression time on more data size since compression is performed
block size wise and the compression time increases
linearly. Estimated worst time on 2TB memory is about 15 hours for
lzo and about 40 hours for zlib. In this case, compressed data
size is larger than the original, so they are really not used,
compression time is fully meaningless. I think compression must be
done in parallel, and I'll post such patch later.
Diffstat
* makedumpfile
diskdump_mod.h | 3 +-
makedumpfile.c | 98 +++++++++++++++++++++++++++++++++++++++++++++++++------
makedumpfile.h | 12 +++++++
3 files changed, 101 insertions(+), 12 deletions(-)
* crash
defs.h | 1 +
diskdump.c | 20 +++++++++++++++++++-
diskdump.h | 3 ++-
3 files changed, 22 insertions(+), 2 deletions(-)
TODO
* evaluation including I/O time using actual vmcores
Thanks.
HATAYAMA, Daisuke
1 year
Re: [Crash-utility] [RFI] Support Fujitsu's sadump dump format
by tachibana@mxm.nes.nec.co.jp
Hi Hatayama-san,
On 2011/06/29 12:12:18 +0900, HATAYAMA Daisuke <d.hatayama(a)jp.fujitsu.com> wrote:
> From: Dave Anderson <anderson(a)redhat.com>
> Subject: Re: [Crash-utility] [RFI] Support Fujitsu's sadump dump format
> Date: Tue, 28 Jun 2011 08:57:42 -0400 (EDT)
>
> >
> >
> > ----- Original Message -----
> >> Fujitsu has stand-alone dump mechanism based on firmware level
> >> functionality, which we call SADUMP, in short.
> >>
> >> We've maintained utility tools internally but now we're thinking that
> >> the best is crash utility and makedumpfile supports the sadump format
> >> for the viewpoint of both portability and maintainability.
> >>
> >> We'll be of course responsible for its maintainance in a continuous
> >> manner. The sadump dump format is very similar to diskdump format and
> >> so kdump (compressed) format, so we estimate patch set would be a
> >> relatively small size.
> >>
> >> Could you tell me whether crash utility and makedumpfile can support
> >> the sadump format? If OK, we'll start to make patchset.
I think it's not bad to support sadump by makedumpfile. However I have
several questions.
- Do you want to use makedumpfile to make an existing file that sadump has
dumped small?
- It isn't possible to support the same form as kdump-compressed format
now, is it?
- When the information that makedumpfile reads from a note of /proc/vmcore
(or a header of kdump-compressed format) is added by an extension of
makedumpfile, do you need to modify sadump?
Thanks
tachibana
> >
> > Sure, yes, the crash utility can always support another dumpfile format.
> >
>
> Thanks. It helps a lot.
>
> > It's unclear to me how similar SADUMP is to diskdump/compressed-kdump.
> > Does your internal version patch diskdump.c, or do you maintain your
> > own "sadump.c"? I ask because if your patchset is at all intrusive,
> > I'd prefer it be kept in its own file, primarily for maintainability,
> > but also because SADUMP is essentially a black-box to anybody outside
> > Fujitsu.
>
> What I meant when I used ``similar'' is both literally and
> logically. The format consists of diskdump header-like header, two
> kinds of bitmaps used for the same purpose as those in diskump format,
> and memory data. They can be handled in common with the existing data
> structure, diskdump_data, non-intrusively, so I hope they are placed
> in diskdump.c.
>
> On the other hand, there's a code to be placed at such specific
> area. sadump is triggered depending on kdump's progress and so
> register values to be contained in vmcore varies according to the
> progress: If crash_notes has been initialized when sadump is
> triggered, sadump packs the register values in crash_notes; if not
> yet, packs registers gathered by firmware. This is sadump specific
> processing, so I think putting it in specific sadump.c file is a
> natural and reasonable choise.
>
> Anyway, I have not made any patch set for this. I'll post a patch set
> when I complete.
>
> Again, thanks a lot for the positive answer.
>
> Thanks.
> HATAYAMA, Daisuke
>
>
> _______________________________________________
> kexec mailing list
> kexec(a)lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec
1 year
crash cannot work for the newest qemu's core
by Wen Congyang
Hi, all
When I use crash to deal with the vmcore generated by 'vrish dump', I meet the following
error:
crash: seek error: kernel virtual address: ffffffff8180f1e0 type: "cpu_possible_mask".
When I specify '-d 8' to get more information, I found the following message:
NOTE: KVM/QEMU CPU_SAVE_VERSION 12 is greater than supported version 9
So I guess crash does not support it now. Does anyone have plan to fix it?
Thanks
Wen Congyang
12 years, 4 months
[ANNOUNCE] crash version 6.0.8 is available
by Dave Anderson
Download from: http://people.redhat.com/anderson
Changelog:
- Introduction of a new "tree" command that can be used to dump the
the addresses of all data structure entries in a red-black tree or
a radix tree. Similar in nature to the "list" command, each data
structure in a tree can be dumped in total, or one or more members
in each strucure may be dumped.
(qiaonuohan(a)cn.fujitsu.com, anderson(a)redhat.com)
- If a compressed kdump header contains an invalid "nr_cpus" value,
allow the crash session to continue after printing a warning
message. Without the patch, on non-S390/S390X systems, an invalid
nr_cpus value generates a message such as "crash: compressed kdump:
invalid nr_cpus value: 0", and the session subsequently fails with
the message "crash: vmcore: not a supported file format". However,
compressed kdumps have been seen that have an nr_cpus value of 0,
but the session can still run normally. The patch changes the
message to "WARNING: compressed kdump: invalid nr_cpus value: 0",
and the session is allowed to continue.
(anderson(a)redhat.com)
- Clarify the "help -n" output for compressed kdumps to show the
offsets and sizes of the vmcoreinfo, notes, and eraseinfo sections
in both hexadecimal and decimal, and to cleanly handle compressed
kdumps that have no NR_PRSTATUS notes in the notes section.
(anderson(a)redhat.com)
- Fix for the X86 "bt" command for a possible situation where the
crashing cpu's back trace starts at the "sysrq_handle_crash" stack
frame instead of farther down the stack below the exception at the
"crash_kexec" stack frame.
(anderson(a)redhat.com)
- Fix for the "runq" command for kernels that have the CFS scheduler.
Without the patch, tasks queued on a priority array of a cpu's RT
runqueue may not be displayed.
(anderson(a)redhat.com)
- Fix for analyzing dumpfiles from kernel version 3.5 and later, in
which the kernel log buffer has been converted from a byte-buffer to
a variable-length record buffer. Without the patch, the crash
session fails during initialization with the error message "crash:
cannot determine length of symbol: log_end". If the session is run
on a live system, or if the session is invoked with the "-s" command
line option, the session is not killed, but in those cases the "sys"
and "log" commands will fail with the same error message.
(anderson(a)redhat.com)
- For kernel versions 3.5 and later, in which the kernel log buffer has
been converted from a byte-buffer to a variable-length record buffer,
two new options have been added. The "log -t" option will display
log messages without the timestamp prepended. The "log -d" option
will display the dictionary of key/value pair properties that the
kernel's dev_printk() function optionally appends to a message.
(anderson(a)redhat.com)
- The SIAL extension module has been replaced by the "eppic" facility,
which stands for "Embeddable Pre-Processor and Interpreter for C".
The eppic git tree is located at http://code.google.com/p/eppic.
When "make extensions" is done, the eppic source code will be
downloaded automatically via "git clone", and then the "eppic.so"
extension module will be built. The "eppic.so" extension module
offers the same command set as the older "sial.so" module; the SIAL
extension module source files have been completely removed. If
desired, the eppic sources can be updated by executing "git pull"
from the "extensions/eppic" subdirectory.
(lchouinard(a)s2sys.com)
- Added a new "list -h" option. When used with -h, the "start",
address must be the address of a data structure that contains
an embedded list_head structure. Updated the "list" help page
to more clearly differentiate the difference between using a
"start" address alone, "-H start", or "-h start", and added a
WARNING section to address the problem of "-h start" passing
through an external LIST_HEAD(), or passing though the actual
starting point of the list that is contained within a different
type of data structure from all the entries in the list.
(ptesarik(a)suse.cz, qiaonuohan(a)cn.fujitsu.com, anderson(a)redhat.com)
- Implemented a new "scope" crash environment variable that can alter
the text scope for viewing the definition of data structures. It is
useful in cases where the kernel defines more than one instance of
of a data structure with the same name, and the "wrong" one is
selected by default. The variable takes a kernel or module text
symbol name or address, or an expression evaluating to the same.
If the variable is a module text address, then the command will
attempt to load the module into the crash session if it is not
already loaded; if that fails, then the setting of the variable
will fail.
(anderson(a)redhat.com)
- Update to the extensions/trace.c extension modue to handle a kernel
version 3.4 patch that added a new "ring_buffer_per_cpu.nr_pages"
member, making the trace buffer size per-cpu.
(rabin(a)rab.in, laijs(a)cn.fujitsu.com)
- Fix to recognize a kernel version 3.5 patch that changed the
"qstr.len" member from an unsigned integer into a member of an
anonymous structure within an anonymous union. Without the patch,
the following commands fail, displaying the following error messages:
mount: "mount: invalid structure member offset: qstr_len"
files: "files: invalid structure member offset: qstr_len"
vm: "vm: invalid structure member offset: qstr_len"
swap: "swap: invalid structure member offset: qstr_len
fuser: "files: invalid structure member offset: qstr_len"
The "fuser" command generates the above error because it uses the
"files" command behind the scenes.
(anderson(a)redhat.com)
- Fix for the function that gathers a cpu's register set from an
NT_PRSTATUS note of an x86 or x86_64 compressed kdump header if one
or more cpus were offline when the system crashed. In that case,
if the requested cpu number is equal or greater than the number of
online cpus, the function will fail. When that happens, that cpu's
back trace will not have those registers as a fall-back option if the
starting point cannot be determined otherwise.
(anderson(a)redhat.com)
- Added "ipcs" and "tree" command references to the crash.8 man page.
(anderson(a)redhat.com)
- Redefined the usage of the "struct -o" flag when used in conjunction
with a symbol or address argument. Without this patch, the behavior
has been to print the warning message "struct: -o option not valid
with an address argument", ignore the "-o", and to just display the
structure at that address. With this patch, each structure member
will be proceded by its virtual address.
(anderson(a)redhat.com)
- Added new "bt -s [-xd]" options that will display symbol names plus
their offset in each frame. The default behavior is unchanged, where
only the symbol name is displayed. The symbol offset will be
expressed in the default output format, which can be overridden with
the -x or -d options.
(anderson(a)redhat.com)
- Fix for 32-bit PPC to handle a situation where one or more
NT_PRSTATUS note(s) were not captured in the kdump header due
to cpu(s) not responding to an IPI. Without the patch, the "bt"
command may result in a segmentation violation.
(nakayama.ts(a)ncos.nec.co.jp)
- Fix for building the PPC64 architecture in ppc64 environments where
where applications are built 32-bit by default when -m32 or -m64 are
not specified. This was a regression introduced in the crash-6.0.3
patch that introduced the "make target=PPC" feature that can be
performed on ppc64 hosts. Without the patch, a "make" command would
build a 32-bit PPC crash utility on such ppc64 hosts.
(anderson(a)redhat.com)
- Fix for the 32-bit PPC "irq" command. Without the patch, depending
upon the kernel version, the command would fail with the message
"irq: cannot determine number of IRQs", or "irq: invalid structure
size: irqdesc".
(nakayama.ts(a)ncos.nec.co.jp)
- Fix for the 32-bit PPC "pte" command to properly translate the PTE
bit settings based upon the correct Book3E specifications.
(nakayama.ts(a)ncos.nec.co.jp)
12 years, 5 months