From mboxrd@z Thu Jan  1 00:00:00 1970
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Subject: Re: INFO: task hung in sync_blockdev
To: Jan Kara <jack@suse.cz>, Dmitry Vyukov <dvyukov@google.com>
Cc: Andi Kleen <ak@linux.intel.com>,
 syzbot <syzbot+283c3c447181741aea28@syzkaller.appspotmail.com>,
 Andrew Morton <akpm@linux-foundation.org>, jlayton@redhat.com,
 LKML <linux-kernel@vger.kernel.org>, Linux-MM <linux-mm@kvack.org>,
 Mel Gorman <mgorman@techsingularity.net>, Ingo Molnar <mingo@kernel.org>,
 rgoldwyn@suse.com, syzkaller-bugs@googlegroups.com,
 linux-fsdevel@vger.kernel.org
References: <001a11447070ac6fcb0564a08cb1@google.com>
 <20180207155229.GC10945@tassilo.jf.intel.com>
 <20180208092839.ebe5rk6mtvkk5da4@quack2.suse.cz>
 <CACT4Y+ZTNDhEhAAP2PYRH5WxEeEM0xHdp4UKqtNaWhU6w4sj_g@mail.gmail.com>
 <20180208140833.lpr4yjn7g3v3cdy3@quack2.suse.cz>
 <CACT4Y+bwnyFmgTNMTa1p8WKecH=OU5Za_hboY7Q=V2Aq+DOsKQ@mail.gmail.com>
 <20180208161821.f7x3gopytdtzgf65@quack2.suse.cz>
From: Andrey Ryabinin <aryabinin@virtuozzo.com>
Message-ID: <22e5e2e1-fd64-1a75-a80c-332a34266717@virtuozzo.com>
Date: Thu, 8 Feb 2018 19:23:44 +0300
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On 02/08/2018 07:18 PM, Jan Kara wrote:

>> By "full kernel crashdump" you mean kdump thing, or something else?
> 
> Yes, the kdump thing (for KVM guest you can grab the memory dump also from
> the host in a simplier way and it should be usable with the crash utility
> AFAIK).
> 

In QEMU monitor 'dump-guest-memory' command:

(qemu) help dump-guest-memory 
dump-guest-memory [-p] [-d] [-z|-l|-s] filename [begin length] -- dump guest memory into file 'filename'.
                        -p: do paging to get guest's memory mapping.
                        -d: return immediately (do not wait for completion).
                        -z: dump in kdump-compressed format, with zlib compression.
                        -l: dump in kdump-compressed format, with lzo compression.
                        -s: dump in kdump-compressed format, with snappy compression.
                        begin: the starting physical address.
                        length: the memory size, in bytes

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