data is
recovered once default mirror is damaged or how mirror set is created.
Hopefully my simple idea would help:
AFAIK, RAID is now implemented via device mapper. Precisely, mirror
mapping. Thus, I suggest to lurk into device mapper code for further
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, they react differently on different architecture.
Have you ever considered that situation?
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for 2.6, but it
is far less functional than MD.
I see...so basically DM isn't meant for RAID...?
ie. DM does not support raid 10, 4, 5, or 6. MDRAID supports all of those
including multiple varieties of raid 10.
aha but wait, raid 10? or 1+0?
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that blocks-- boom?
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are available, please? (I am terribly sorry,
but you are only one person I know here.) Thank you in advance.
As far as I can tell, your mail reach kernelnewbies list as well :)
NB: I am available...but not sure if I could help :)
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is
considered valid or not.
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On Fri, Dec 17, 2010 at 11:18, naveen yadav yad.nav...@gmail.com wrote:
Nice document, This document have good info .
Thanks :) If you have feedback or corrections, please let me know so I
could possibly release erratas...
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during fork()
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version), use exactly same gcc
version.
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Please read
/meminfo. Hopefully you can find the answer of your questions by
yourself...
Good luck...and let me know your feedback about that article..
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Hi Hemanth.
On Mon, Dec 13, 2010 at 17:05, Hemanth Kumar hemw...@yahoo.co.in wrote:
Hi Mulaydi Robert,
Below is the info that is requested,
OK let's see
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GCC _
arm-none-linux-gnueabi-gcc
module (.ko) file?
PS: as long as you make sure the kernel config is about the same on
those boards, excluding specific arch config, then I think you might
also need to hunt something out of kernel space.
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doesn't throw it away.
Other (untested and unrealiable) idea is to use volatile
identifier...AFAIK, that would prevent symbols to be optimized out.
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EXPORT_SYMBOL_GPL()? And what I am afraid is that all
those symbol are wiped out due to optimization.
static int __init hi(void)
{
printk(KERN_INFO module m2 being loaded.\n);
So if my above suspicion is right, how about doing
printk(KERN_INFO %d\ rday_3++)
just to cheat...?
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Hi Rob
On Sat, Dec 11, 2010 at 00:23, Robert P. J. Day rpj...@crashcourse.ca wrote:
On Fri, 10 Dec 2010, Mulyadi Santosa wrote:
then i did cat /proc/kallsyms | grep rday_3
i can see the rday_3 in that file,But still I am unable to insmod the
m3.ko
The address you gaveif I
.
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, why? and also, is it possible to use more fine grained
lock...which is specific to both task, thus decreasing lock grab
interval?
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is a list?
Then, how about making a circular list? And insertion/deletion is done via RCU?
Regarding the counter, I think we can create a counter specific lock...
CMIIW
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are enabled?
CONFIG_SYSFS_DEPRECATED=y
CONFIG_SYSFS_DEPRECATED_V2=y
In short, it's a way to make old userspace tools understand the new
way of Linux kernel represents device structuresKindly try it and
tell us if it does fix the problem..
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experience to me as well. lesson learned: lack
of free space could introduce hell lot of problem we could't even
imagine could exist :D
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it even faster in some cases.
The same trick should also apply on qemu-kvm as well AFAIK. Your call :)
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/linux+v2.6.12/kernel/sched.c#L1178 says so
OK, Lalit, it's your chance to submit a patch to LKML to fix this
issue :) What do you think?
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/wiki/Load_balancing#Layer-7_Load_Balancing
would fit your bill :) Have a look :)
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On Wed, Dec 8, 2010 at 23:00, sanoj k.u.sa...@gmail.com wrote:
Hello all,
I want to track the read/write operations for a particular inode at the vfs
layer.
Try inotify
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interrupt is reenabled...thus indirectly trigerring
scheduler_tick. While scheduler_tick itself is called in every timer
tick.
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of network interface some of them are rtl8130 and e1000. The
complete supported model could be seen by using this command:
$ qemu-system-x86_64 -net nic,model=?
qemu: Supported NIC models:
ne2k_pci,i82551,i82557b,i82559er,rtl8139,e1000,pcnet,virtio
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a must nowadays I guess...you already prepare somekind of High
Availability setup between those servers.
And then? Same like you debug your casual user space programs. So I
ask you back, how do you usually do that such job?
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#L519
then I assume it simply detects that it is already freed and returns
immediately.
b) Can kernel detect double kfree() ?
not sure, but I saw a call to kmemleak facility close to the line I
mentioned above...likely it could detect double [k]free()
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to take .
I think you should read hugepage-mmap.c, hugepage-shm.c,map_hugetlb.c
and hugetlbpage.txt in
http://lxr.linux.no/linux+v2.6.36/Documentation/vm/
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with FORTIFY checking. Try to disable it
first...I guess it must be -D_FORTIFY_SOURCE=0.
NB: something is overflowing
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?
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always
running, L1/L2/L3 cache is effectively utilizedeverybody happy :D
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in
the systems with CONFIG_HOTPLUG_CPU enabled!
And this:
http://www.alexonlinux.com/why-interrupt-affinity-with-multiple-cores-is-not-such-a-good-thing
could answer some of your headache regarding the problem :)
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blog
.
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according to current system load isn't a concern for a real time
process.
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)].start)
AFAIK, for example dev is foo, bar is bar, then
pci_resource_start(foo,bar) becomes:
foo-resource[bar].start
Seems like calling a function of field, which in turns is coming from
a pointer, no?
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there (from device driver), then it is
captured and registered in a subsystem...that is kobject..I
think..which is related to sysfs.
Greg KH and others might know better
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On Mon, Nov 22, 2010 at 17:42, Anuz Pratap Singh Tomar
chambilketha...@gmail.com wrote:
So I guess document is ready to be used/uploaded to kerrnelnewbie site if
there are no more points/suggestions or criticism.
You have my support... the document looks good!
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there...
Yes, of course, but it just meant it can, not it must be. This is
strictly design decision IMO
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architecture, thus close as Pentium M?
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I against people who wanna ask when he/she meets trouble? No.
But if he/she asked like he/she wanna be treated like somekind of
messenger of God, please help yourself.
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no real benchmark)
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of Pentium 4.
So, which one is right? I asked this because I wanna optimize my
kernel optimization with the hope of reducing power consumption as
much as possible in kernel space (besides the no_hz and ticks
frequency etc of course).
Thanks in advance..
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On Thu, Nov 18, 2010 at 16:13, Bond jamesbond.2...@gmail.com wrote:
Hi,as mentioned on this link
It's unreadable, at least in my side. I think the best way here is to
just paste the code here or somewhere like pastebin.com
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poll() underneath..
4. If there's indeed input (in buffer) read it...I think it just read
1 byte. If there no input, break the loop altogether.
5. Back to (1).
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multiple times. AFAIK seq lock is unblocking lock, thus to avoid
contention over several reader that might need time read too.
Hopefully I am offering logical explanation...all above are purely my
interpretation based directly from code reading.
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the old days e.g
: RTFM, STFW. Or more economically, like Manish has said take a deep
breath Mulyadithen press Delete.
PS: Now I know why Delete button, at least in my HP laptop, is
positioned in upper rightmost :)
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blog
,
hopefully to optimize the function
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competition but also high laziness among students. They go to CS
but they don't really want to study CS. So, how would that be?
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first?
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:)
well, nice...but uhm, pardon me, cp? Are you sure? cp is copying
content, you know...while mount --bind it's like doing symbolic
link..and IMHO bind mount should be the choice. But maybe I missed
something...
All in all, congrats ! :)
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changes ,data structure changes ,and other stuffs which I need to take care
while porting.
Not so up to update, but hopefully still somewhat useful:
http://lwn.net/Articles/2.6-kernel-api/
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=IFF_UP|IFF_BROADCAST|IFF_RUNNING|IFF_MULTICAST}) = 0
It's ioctl..
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-leaks-in-kernel.html
Personally, I really appreciate your effort. I know it takes time and
energy, but you do help others who might have quite the same problem
in the future.
Great job!
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above suspicions...
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/11/4/94
Oh wait, maybe this patch mean, by restricting it to be readable only
by root, we reduce attack vector, right? Thus, one can't easily
predicts address symbols, right?
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/2010/11/4/94
Well well, I just know that we can overwrite some entries in kallsyms.
Am I correct?
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and then somebody here could give more
precise suggestion?
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Please read
...or chipset)
that send somekind of signal (of announcement). Driver picks it up
since the probe function had been registered before in that bus line
(or irq line).
Since then, driver takes over whenever there are data sent or received...
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on cgroups...who knows it is doable via cgroups.
but regarding the size of memory allocated for a program or programs
launched by a user, you can check ulimit and/or cgroups.
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it into LKD3, simply being too new.
Not sure if it's a feature or not, but I saw in 2.6.36, anticipatory
I/O scheduler is no longer exist. Is that true? And what could be the
reason?
Also, I saw XIP in ext2 filesystem. Quite neat..but again, why?
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works
etc
NB: Does LKD3 mention about Kernel Same page Merge (KSM)? No need to
be deep, but I think it's interesting to mention it since it will
reduce memory consumption done by virtual machine/hypervisor (KVM, for
example).
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) to reduce latency during high I/O... but I
can't recall which patch that is. Try to google...
NB: ftrace might help here please kindly read the ftrace tutorial
posted in lwn.net in few latest editions...
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blog
or email me, whatever you prefer.
I think I'll keep posting in this kernelnewbies' thread for now..if
everybody with this of course
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in ext2 filesystem. Quite neat..but again, why?
hmmm ... not sure, i'll look into that.
I just speculate it is due to fact that ext2 is used in embedded
stuffs..thus execute in place reduce page cache usage..especially for
one time running application.
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limited amount of ram and
your code running in rom or flash.
Make senses to me...thanks for the explanation greg. Anyway, why ext3
doesn't have similar feature?
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2.0.x or at least the beginning of 2.2.x era. LXR
confirms no such functions exist.
I think it's now called copy_from_user() and copy_to_user()
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:
unreferenced object 0xf8211000 (size 512):
comm insmod, pid 9602, jiffies 3666022 (age 1553.469s)
That's because the code path that causes the leak is running on behalf
of insmod process
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it out.
Thanks for sharing your result too... :)
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Please
On Tue, Oct 26, 2010 at 12:09, Ram Sharma ram99.sha...@gmail.com wrote:
How can I edit net/core/Makefile to compile tmp.c without O2?
AFAIK, check the Makefile in the top directory of the kernel source,
then manually delete -O2 in CFLAGS
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?
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that used it once...
- X server/ X org...once use it too...
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word like please? Or is it common in your family to
command somebody like your slave?
Anyway, try Linux Device Driver 3rd edition. Yes it's old...but it's amazing.
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be that the whole code is already in the
same cache line thus subsequent call doesn't fetch anything from RAM.
This is assuming everything is (almost) perfectly cache aligned.
BTW, are all the codes executed? or are we hitting 10/90 percent scenario here?
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Hi..
On Fri, Oct 22, 2010 at 09:11, Andev debian...@gmail.com wrote:
Even after re-enabling MTRR range, the slowdown persists.(check my
other mail for details).
OK then, I think I second that. Quite obvious..at least from your
provided evidence
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. Isn't there something already capable of doing that?
Try oprofile or ltt-ng...you won't be disappointed :)
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section is a big no no
c. in this code path, are we likely to see another process coming to
be runnable?
probably more..the idea is, whenever you see a chance to improve
throughput while reducing latency at the same time, re scheduling is
worth to call IMHO
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description that I have written:
http://dl.fullcirclemagazine.org/issue39_en.pdf
(page 14-20)
Happy reading...
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of direct I/O
Warning: this is a thought from non filesystem guy :D
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On Mon, Oct 18, 2010 at 00:22, Rajat Sharma fs.ra...@gmail.com wrote:
My guess is get_user_pages called to pin pages in memory is not happy with
kernel pages and it is returning -EFAULT.
I second that if not, the function name wouldn't be labeled user...
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? If yes, can you please help with proper link or is there any means to get
hardware information through software.
You mean this?
$ cat /sys/devices/system/clocksource/clocksource0/available_clocksource
hpet acpi_pm
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Mulyadi Santosa
Freelance Linux trainer and consultant
blog
think qemu-devel list is more appropriate place to discuss it
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Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
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? Surely there must be reusable APIs
there or netlink or something...
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Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
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, canary or something like
that...
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Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
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On Sat, Oct 16, 2010 at 23:01, Abu Rasheda rcpilot2...@gmail.com wrote:
Trying once more. It did not show up in my mail box. Any suggestions ?
I am not the guy in this field, but have you considered doing FPGA hacking?
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Mulyadi Santosa
Freelance Linux trainer and consultant
blog
with kernel janitorial..
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Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
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On Fri, Oct 15, 2010 at 16:56, Jason Nymble jason.nym...@gmail.com wrote:
Look at hrtimer API.
Just make sure you have HPET too:
$ cat /sys/devices/system/clocksource/clocksource0/available_clocksource
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Mulyadi Santosa
Freelance Linux trainer and consultant
blog
for sharing... :) This kind of simple typo should be documented
somewhere perhaps you could kindly write it down in kernelnewbies
wiki in FAQ section? or troubleshooting or anything alike?
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Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training
to zero
but again...it's just my raw analysis. Feel free to accept it or
not...
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Mulyadi Santosa
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On Mon, Oct 11, 2010 at 22:20, shivanth m p fordearli...@gmail.com wrote:
Here's my makefile
obj-m +=mydiver.o
^^ sure that's not a typo?
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Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training
the source address is within the ok-ed range..that
is..the user space range.
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Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
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it with people like Greg Kroah
Hartman. Fortunately, he's in kernelnewbies too :)
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Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
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me with your humble but slick analysis! I
back you up! :)
NB: if the above Rik's statement confuse you, let us know so we could
elaborate it...
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Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
lines of
the boot message before it got hung.
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Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
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Please read
,
Mulyadi Santosa
Freelance Linux trainer and consultant
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training: mulyaditraining.blogspot.com
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