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Old 07-04-2012, 06:34 AM
ŤčŹŚłÖ
 
Default crash seek error, kernel_config_data and cpu_possible_mask

Hi, I'm happy to ask developers for help , I'm really confused for my crash error.

My computer room is running 60 nodes,OS: suse 11 sp1 x86_64¬* Kernel:2.6.32.12-0.7-default¬*¬* Crash:crash-5.0.1-1.5.5

recently , server often kernel crash, Kdump service dump the vmcore in /var/crash/happen-date/vmcore,


I installed the kernel-debuginfo so that check out why crash ,but I got this:



¬*linux:~/bb # crash -d8 vmlinux-2.6.32.12-0.7-default vmlinux-2.6.32.12-0.7-default.debug vmcore

crash 5.0.1
Copyright (C) 2002-2010¬* Red Hat, Inc.

Copyright (C) 2004, 2005, 2006¬* IBM Corporation
Copyright (C) 1999-2006¬* Hewlett-Packard Co
Copyright (C) 2005, 2006¬* Fujitsu Limited
Copyright (C) 2006, 2007¬* VA Linux Systems Japan K.K.
Copyright (C) 2005¬* 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.

compressed kdump: header->utsname.machine:

diskdump_data:
¬*¬*¬*¬*¬*¬*¬*¬*¬* filename: (null)
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* flags: 6 (KDUMP_CMPRS_LOCAL|ERROR_EXCLUDED)
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* dfd: 3
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* ofp: 0
¬*¬*¬*¬*¬* machine_type: 62 (EM_X86_64)

¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* header: ccdfe0

¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* signature: "KDUMP¬*¬* "
¬*¬*¬*¬*¬* header_version: 1
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* utsname:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* sysname:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* nodename:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* release:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* version:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* machine:

¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* domainname:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* timestamp:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* tv_sec: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* tv_usec: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* status: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬* block_size: 4096
¬*¬*¬*¬*¬*¬*¬* sub_hdr_size: 1
¬*¬*¬*¬*¬*¬* bitmap_blocks: 400

¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* max_mapnr: 6553600
¬*¬*¬* total_ram_blocks: 0
¬*¬*¬*¬*¬*¬* device_blocks: 0
¬*¬*¬*¬*¬* written_blocks: 0
¬*¬*¬*¬*¬*¬*¬*¬* current_cpu: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* nr_cpus: 1
¬*¬*¬*¬*¬* tasks[nr_cpus]: 0

¬*¬*¬*¬*¬*¬*¬* sub_header: 0 (n/a)


¬* sub_header_kdump: cceff0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* phys_base: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬* dump_level: 0 (0x0)

¬*¬*¬*¬*¬*¬* data_offset: 192000
¬*¬*¬*¬*¬*¬*¬* block_size: 4096
¬*¬*¬*¬*¬*¬* block_shift: 12
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* bitmap: 7fcca1e01010
¬*¬*¬*¬*¬*¬*¬* bitmap_len: 1638400

¬*¬* dumpable_bitmap: 7fcca1002010
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* byte: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* bit: 0
¬*¬* compressed_page: ce3220
¬*¬*¬*¬*¬*¬*¬*¬* curbufptr: 0

¬*page_cache_hdr[0]:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0

¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: cd3210
¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0
¬*page_cache_hdr[1]:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: cd4210
¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0
¬*page_cache_hdr[2]:

¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: cd5210
¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0
¬*page_cache_hdr[3]:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: cd6210

¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0
¬*page_cache_hdr[4]:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: cd7210
¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0
¬*page_cache_hdr[5]:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0

¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: cd8210
¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0
¬*page_cache_hdr[6]:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: cd9210
¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0
¬*page_cache_hdr[7]:

¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: cda210
¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0
¬*page_cache_hdr[8]:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: cdb210

¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0
¬*page_cache_hdr[9]:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: cdc210
¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0
page_cache_hdr[10]:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0

¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: cdd210
¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0
page_cache_hdr[11]:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: cde210
¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0
page_cache_hdr[12]:

¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: cdf210
¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0
page_cache_hdr[13]:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: ce0210

¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0
page_cache_hdr[14]:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: ce1210
¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0
page_cache_hdr[15]:
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_flags: 0 ()
¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_addr: 0

¬*¬*¬*¬*¬*¬*¬*¬*¬*¬* pg_bufptr: ce2210
¬*¬*¬*¬*¬*¬*¬* pg_hit_count: 0

¬*¬*¬* page_cache_buf: cd3210
¬*¬*¬*¬*¬*¬* evict_index: 0
¬*¬*¬*¬*¬*¬*¬*¬* evictions: 0
¬*¬*¬*¬*¬*¬*¬*¬*¬* accesses: 0
¬*¬*¬*¬*¬* cached_reads: 0
¬*¬*¬*¬*¬*¬* valid_pages: cd0000

crash: pv_init_ops exists: ARCH_PVOPS
compressed kdump: phys_base: 0
gdb vmlinux-2.6.32.12-0.7-default.debug
GNU gdb (GDB) 7.0
Copyright (C) 2009 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 "x86_64-unknown-linux-gnu"...

GETBUF(248 -> 0)
¬* GETBUF(1500 -> 1)

¬* FREEBUF(1)
FREEBUF(0)
<readmem: ffffffff8141ae40, KVADDR, "kernel_config_data", 32768, (ROE), 1ab66b0>
¬*¬*¬* addr: ffffffff8141ae40¬* paddr: 141ae40¬* cnt: 448

crash: seek error: kernel virtual address: ffffffff8141ae40¬* type: "kernel_config_data"
WARNING: cannot read kernel_config_data
GETBUF(248 -> 0)
FREEBUF(0)
GETBUF(512 -> 0)
<readmem: ffffffff81413640, KVADDR, "cpu_possible_mask", 8, (FOE), 7fff84995368>

¬*¬*¬* addr: ffffffff81413640¬* paddr: 1413640¬* cnt: 8
crash: seek error: kernel virtual address: ffffffff81413640¬* type: "cpu_possible_mask"

if I¬* use¬* --minimal can got¬*¬* crash>¬*¬* but It limits a lot..


something like crash can't find cpu_possible_mask and cpu_possible_mask¬* in vmcore I guess,

I Google it and find some email talking about this , read the whitepaper writed by anderson, but I can't resolve it.


any help I am really appreciated. Any other infomation need I provide, please tell me ,I'll reply as soon as possible.




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Crash-utility@redhat.com
https://www.redhat.com/mailman/listinfo/crash-utility
 
Old 07-05-2012, 02:06 PM
Dave Anderson
 
Default crash seek error, kernel_config_data and cpu_possible_mask

----- Original Message -----
>
> Hi, I'm happy to ask developers for help , I'm really confused for my
> crash error.
>
> My computer room is running 60 nodes,OS: suse 11 sp1 x86_64
> Kernel:2.6.32.12-0.7-default Crash:crash-5.0.1-1.5.5
>
> recently , server often kernel crash, Kdump service dump the vmcore
> in /var/crash/happen-date/vmcore,
>
> I installed the kernel-debuginfo so that check out why crash ,but I
> got this:
>
>
>
> linux:~/bb # crash -d8 vmlinux-2.6.32.12-0.7-default vmlinux-2.6.32.12-0.7-default.debug vmcore
>
> crash 5.0.1
> Copyright (C) 2002-2010 Red Hat, Inc.
> Copyright (C) 2004, 2005, 2006 IBM Corporation
> Copyright (C) 1999-2006 Hewlett-Packard Co
> Copyright (C) 2005, 2006 Fujitsu Limited
> Copyright (C) 2006, 2007 VA Linux Systems Japan K.K.
> Copyright (C) 2005 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.
>
> compressed kdump: header->utsname.machine:
> diskdump_data:
> filename: (null)
> flags: 6 (KDUMP_CMPRS_LOCAL|ERROR_EXCLUDED)
> dfd: 3
> ofp: 0
> machine_type: 62 (EM_X86_64)
>
> header: ccdfe0
> signature: "KDUMP "
> header_version: 1
> utsname:
> sysname:
> nodename:
> release:
> version:
> machine:
> domainname:
> timestamp:
> tv_sec: 0
> tv_usec: 0
> status: 0 ()
> block_size: 4096
> sub_hdr_size: 1
> bitmap_blocks: 400
> max_mapnr: 6553600
> total_ram_blocks: 0
> device_blocks: 0
> written_blocks: 0
> current_cpu: 0
> nr_cpus: 1
> tasks[nr_cpus]: 0
>
> sub_header: 0 (n/a)
>
> sub_header_kdump: cceff0
> phys_base: 0
> dump_level: 0 (0x0)
>
> data_offset: 192000
> block_size: 4096
> block_shift: 12
> bitmap: 7fcca1e01010
> bitmap_len: 1638400
> dumpable_bitmap: 7fcca1002010
> byte: 0
> bit: 0
> compressed_page: ce3220
> curbufptr: 0
>
> page_cache_hdr[0]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: cd3210
> pg_hit_count: 0
> page_cache_hdr[1]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: cd4210
> pg_hit_count: 0
> page_cache_hdr[2]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: cd5210
> pg_hit_count: 0
> page_cache_hdr[3]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: cd6210
> pg_hit_count: 0
> page_cache_hdr[4]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: cd7210
> pg_hit_count: 0
> page_cache_hdr[5]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: cd8210
> pg_hit_count: 0
> page_cache_hdr[6]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: cd9210
> pg_hit_count: 0
> page_cache_hdr[7]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: cda210
> pg_hit_count: 0
> page_cache_hdr[8]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: cdb210
> pg_hit_count: 0
> page_cache_hdr[9]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: cdc210
> pg_hit_count: 0
> page_cache_hdr[10]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: cdd210
> pg_hit_count: 0
> page_cache_hdr[11]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: cde210
> pg_hit_count: 0
> page_cache_hdr[12]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: cdf210
> pg_hit_count: 0
> page_cache_hdr[13]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: ce0210
> pg_hit_count: 0
> page_cache_hdr[14]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: ce1210
> pg_hit_count: 0
> page_cache_hdr[15]:
> pg_flags: 0 ()
> pg_addr: 0
> pg_bufptr: ce2210
> pg_hit_count: 0
>
> page_cache_buf: cd3210
> evict_index: 0
> evictions: 0
> accesses: 0
> cached_reads: 0
> valid_pages: cd0000
> crash: pv_init_ops exists: ARCH_PVOPS
> compressed kdump: phys_base: 0
> gdb vmlinux-2.6.32.12-0.7-default.debug
> GNU gdb (GDB) 7.0
> Copyright (C) 2009 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 "x86_64-unknown-linux-gnu"...
> GETBUF(248 -> 0)
> GETBUF(1500 -> 1)
>
> FREEBUF(1)
> FREEBUF(0)
> <readmem: ffffffff8141ae40, KVADDR, "kernel_config_data", 32768, ROE), 1ab66b0>
> addr: ffffffff8141ae40 paddr: 141ae40 cnt: 448
> crash: seek error: kernel virtual address: ffffffff8141ae40 type: "kernel_config_data"
> WARNING: cannot read kernel_config_data
> GETBUF(248 -> 0)
> FREEBUF(0)
> GETBUF(512 -> 0)
> <readmem: ffffffff81413640, KVADDR, "cpu_possible_mask", 8, (FOE), 7fff84995368>
> addr: ffffffff81413640 paddr: 1413640 cnt: 8
> crash: seek error: kernel virtual address: ffffffff81413640 type: "cpu_possible_mask"
>
> if I use --minimal can got crash> but It limits a lot..
>
> something like crash can't find cpu_possible_mask and
> cpu_possible_mask in vmcore I guess,
>
> I Google it and find some email talking about this , read the
> whitepaper writed by anderson, but I can't resolve it.
>
> any help I am really appreciated . Any other infomation need I
> provide, please tell me ,I'll reply as soon as possible.

Well for starters, crash-5.0.1 is quite old, and crash-5.0.1-1.5.5 is
a SUSE derivative, and typically I prefer to not get involved too
deeply into debugging issues with (1) older, and (2) derivative versions
of crash.

That being said, for some reason, when trying to access the physical pages
at 141ae40 and 1413640, the compressed kdump is returning SEEK_ERRORs,
which means that those two pages could not be found in the dumpfile.
Since they are both static kernel symbols that are below "edata", one
would expect that they would be there, even if the compressed kdump
had filtered out user pages, cache pages, zero-pages, etc.

A couple things you can try:

(1) Run "crash --minimal ..." on the vmcore, and enter:

crash> rd linux_banner 30

When I run it on RHEL6 2.6.32-based system it looks like this:

crash> rd linux_banner 30
ffffffff81600020: 65762078756e694c 2e32206e6f697372 Linux version 2.
ffffffff81600030: 3032322d32332e36 3638782e366c652e 6.32-220.el6.x86
ffffffff81600040: 636f6d282034365f 7840646c6975626b _64 (mockbuild@x
ffffffff81600050: 622e3430302d3638 736f622e646c6975 86-004.build.bos
ffffffff81600060: 2e7461686465722e 63672820296d6f63 .redhat.com) (gc
ffffffff81600070: 6f69737265762063 20352e342e34206e c version 4.4.5
ffffffff81600080: 3431323031313032 6148206465522820 20110214 (Red Ha
ffffffff81600090: 2d352e342e342074 2943434728202936 t 4.4.5-6) (GCC)
ffffffff816000a0: 4d53203123202920 6f4e206465572050 ) #1 SMP Wed No
ffffffff816000b0: 303a383020392076 5453452033313a33 v 9 08:03:13 EST
ffffffff816000c0: 00000a3131303220 0000000000000000 2011...........
ffffffff816000d0: 0000000000000000 0000000000000000 ................
ffffffff816000e0: 6973726576207325 6d28207325206e6f %s version %s (m
ffffffff816000f0: 646c6975626b636f 3430302d36387840 ockbuild@x86-004
ffffffff81600100: 622e646c6975622e 61686465722e736f .build.bos.redha
crash>

The "Linux version..." string should line up as shown above. What happens
when you do that?

(2) Log onto the machine that crashed -- which is still presumably running
the vmlinux-2.6.32.12-0.7-default kernel -- and try to bring up crash
on the live system:

$ crash vmlinux-2.6.32.12-0.7-default vmlinux-2.6.32.12-0.7-default.debug

What happens then?

Dave

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