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]
