linux-kernel - Re: INFO: task hung in sync

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Message-ID: <22e5e2e1-fd64-1a75-a80c-332a34266717@virtuozzo.com>
Date:   Thu, 8 Feb 2018 19:23:44 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Jan Kara <jack@...e.cz>, Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        syzbot <syzbot+283c3c447181741aea28@...kaller.appspotmail.com>,
        Andrew Morton <akpm@...ux-foundation.org>, jlayton@...hat.com,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Ingo Molnar <mingo@...nel.org>, rgoldwyn@...e.com,
        syzkaller-bugs@...glegroups.com, linux-fsdevel@...r.kernel.org
Subject: Re: INFO: task hung in sync_blockdev



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