Date:	Sun, 13 Mar 2016 22:18:36 -0400
From:	Me <mike.walton33@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: xfsdump is triggering some kind of kernel dump in a VM

Hello Linux mailing list.
First of all let me begin by saying that I don't know if this is the
most appropriate place to send this bug report but I thought I would
start here.

I don't actually know that this is a Virtual machine problem but I've
only seen the problem so far in a VM of mine, specifically when I try
to do an xfsdump. I think 100% of the time when I do and XFS dump
(without changing any kernel paramters from the fedora 23 defaults),
xfsdump fails and I get the following errors pasted below in the log.

I don't know if this is a regression or not but it occurs with kernel
4.4.4 and kernel 4.4.3.
I just booted with the fedora rescue kernel which is 4.2.8.
This problem does not seem to happen with the rescue kernel, either
because the issue is a regression or because there are less modules
doing stuff in the rescue kernel (the cifs module for instance won't be
loaded in the rescue kernel). I have also noticed that if I set
vm.swappiness to 1 or 0, frequency of the problem is reduced but the
problem is not outright solved. If I have posted to the wrong place
then my apologies but please tell me where I really should be sending
this bug report. Thank you for your time.

   Michael Walton

Here are the log entries


Mar 11 22:29:11 ourdeploy kernel: XFS (vdb1): Mounting V5 Filesystem
Mar 11 22:29:11 ourdeploy kernel: XFS (vdb1): Starting recovery
(logdev: internal)
Mar 11 22:29:11 ourdeploy kernel: XFS (vdb1): Ending recovery (logdev:
internal)
Mar 11 22:29:17 ourdeploy audit[1]: SERVICE_STOP pid=1 uid=0
auid=4294967295 ses=4294967295 msg='unit=rolekit comm="systemd"
exe="/us
r/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 11 22:37:14 ourdeploy kernel: page:ffffea00000267c0 count:0
mapcount:-127 mapping:          (null) index:0x0
Mar 11 22:37:14 ourdeploy kernel: flags: 0x1ffff800000000()
Mar 11 22:37:14 ourdeploy kernel: page dumped because:
VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0)
Mar 11 22:37:14 ourdeploy kernel: ------------[ cut here ]------------
Mar 11 22:37:14 ourdeploy kernel: kernel BUG at include/linux/mm.h:342!
Mar 11 22:37:14 ourdeploy kernel: invalid opcode: 0000 [#1] SMP 
Mar 11 22:37:14 ourdeploy kernel: Modules linked in: nls_utf8 cifs
dns_resolver fscache nf_conntrack_netbios_ns nf_conntrack_broadcas
t nf_conntrack_tftp ip6t_rpfilter ip6t_REJECT nf_reject_ipv6
xt_conntrack ip_set nfnetlink ebtable_broute bridge stp llc
ebtable_filt
er ebtable_nat ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6
nf_nat_ipv6 ip6table_raw ip6table_mangle ip6table_security ip6t
able_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4
nf_nat_ipv4 nf_nat nf_conntrack iptable_raw iptable_mangle iptabl
e_security snd_hda_codec_generic snd_hda_intel snd_hda_codec ppdev
snd_hda_core iosf_mbi crct10dif_pclmul snd_hwdep crc32_pclmul snd_
pcm joydev snd_timer virtio_balloon parport_pc snd parport acpi_cpufreq
i2c_piix4 soundcore tpm_tis tpm nfsd nfs_acl lockd grace auth
_rpcgss sunrpc xfs libcrc32c virtio_console
Mar 11 22:37:14 ourdeploy kernel:  virtio_net virtio_blk qxl
drm_kms_helper ttm drm crc32c_intel serio_raw virtio_pci ata_generic
vir
tio_ring virtio pata_acpi
Mar 11 22:37:14 ourdeploy kernel: CPU: 0 PID: 1458 Comm: xfsdump Not
tainted 4.4.4-301.fc23.x86_64 #1
Mar 11 22:37:14 ourdeploy kernel: Hardware name: QEMU Standard PC
(i440FX + PIIX, 1996), BIOS 1.8.2-20150714_191134- 04/01/2014
Mar 11 22:37:14 ourdeploy kernel: task: ffff88003e1d9e00 ti:
ffff880028ccc000 task.ti: ffff880028ccc000
Mar 11 22:37:14 ourdeploy kernel: RIP:
0010:[<ffffffff811b5008>]  [<ffffffff811b5008>] __free_pages+0x38/0x40
Mar 11 22:37:14 ourdeploy kernel: RSP: 0018:ffff880028ccfa48  EFLAGS:
00010246
Mar 11 22:37:14 ourdeploy kernel: RAX: 0000000000000044 RBX:
ffff88003f547900 RCX: 0000000000000006
Mar 11 22:37:14 ourdeploy kernel: RDX: 0000000000000000 RSI:
0000000000000000 RDI: ffff880042c0dff0
Mar 11 22:37:14 ourdeploy kernel: RBP: ffff880028ccfa48 R08:
0000000000000000 R09: 0000000000000254
Mar 11 22:37:14 ourdeploy kernel: R10: 0000000000000001 R11:
0000000000000254 R12: 0000000000000001
Mar 11 22:37:14 ourdeploy kernel: R13: ffffffffa0180d4d R14:
ffff880028ccfb38 R15: 0000000000000001
Mar 11 22:37:14 ourdeploy kernel: FS:  00007f57b020a780(0000)
GS:ffff880042c00000(0000) knlGS:0000000000000000
Mar 11 22:37:14 ourdeploy kernel: CS:  0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Mar 11 22:37:14 ourdeploy kernel: CR2: 00007f21861ec024 CR3:
0000000030025000 CR4: 00000000000406f0
Mar 11 22:37:14 ourdeploy kernel: Stack:
Mar 11 22:37:14 ourdeploy kernel:  ffff880028ccfa70 ffffffffa017fed3
ffff880036d073c0 0000000000000000
Mar 11 22:37:14 ourdeploy kernel:  0000000000010015 ffff880028ccfab0
ffffffffa0180d4d ffff88003f547900
Mar 11 22:37:14 ourdeploy kernel:  0000000000010015 0000000000000001
0000000000010014 ffff880036d073c0
Mar 11 22:37:14 ourdeploy kernel: Call Trace:
Mar 11 22:37:14 ourdeploy kernel:  [<ffffffffa017fed3>]
xfs_buf_free+0x73/0x130 [xfs]
Mar 11 22:37:14 ourdeploy kernel:  [<ffffffffa0180d4d>]
xfs_buf_get_map+0x22d/0x280 [xfs]
Mar 11 22:37:14 ourdeploy kernel:  [<ffffffffa018187d>]
xfs_buf_read_map+0x2d/0x180 [xfs]
Mar 11 22:37:14 ourdeploy kernel:  [<ffffffffa0181a22>]
xfs_buf_readahead_map+0x52/0x70 [xfs]
Mar 11 22:37:14 ourdeploy kernel:  [<ffffffffa0158bc1>]
xfs_btree_reada_bufs+0x61/0x80 [xfs]
Mar 11 22:37:14 ourdeploy kernel:  [<ffffffffa01962d8>]
xfs_bulkstat_ichunk_ra.isra.4+0xe8/0x140 [xfs]
Mar 11 22:37:14 ourdeploy kernel:  [<ffffffffa016e8b3>] ?
xfs_inobt_get_rec+0x33/0xc0 [xfs]
Mar 11 22:37:14 ourdeploy kernel:  [<ffffffffa0196973>]
xfs_bulkstat+0x303/0x670 [xfs]
Mar 11 22:37:14 ourdeploy kernel:  [<ffffffff81244c3d>] ?
__dentry_kill+0x13d/0x1b0
Mar 11 22:37:14 ourdeploy kernel:  [<ffffffffa0196640>] ?
xfs_bulkstat_one_int+0x310/0x310 [xfs]

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