[Filesystems-devel] Bug#884008: aufs-dkms: aufs triggers kernel WARN during boot

[Ralf Jung]

Package: aufs-dkms
Version: 4.9+20161219-1
Severity: normal

Dear Maintainer,

we have aufs installed on our server to be able to run docker.  During boot, I
see the following arror a couple dozen times:

S Sun Dec 10 12:10:27 2017 p4 kernel: aufs au_opts_verify:1607:dockerd[1339]: dirperm1 breaks the protection by the permission bits on the lower branch
S Sun Dec 10 12:10:27 2017 p4 kernel: ------------[ cut here ]------------
S Sun Dec 10 12:10:27 2017 p4 kernel: WARNING: CPU: 0 PID: 1490 at /var/lib/dkms/aufs/4.9+20161219/build/fs/aufs/cpup.c:423 au_cp_regular+0x16c/0x250 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel: .wh..wh.setup_maker_elements-i.ri.0007
Please report this warning to aufs-users ML
S Sun Dec 10 12:10:27 2017 p4 kernel: Modules linked in:
S Sun Dec 10 12:10:27 2017 p4 kernel:  aufs(O) xenfs xen_privcmd joydev hid_generic usbhid hid ppdev sg pcspkr parport_pc parport serio_raw evdev ip_tables x_tables autofs4 ext4 crc16 jbd2 crc32c_generic fscrypto ecb glue_helper lrw gf128mul ablk_helper cryptd aes_x86_64 mbcache sr_mod cdrom ata_generic xen_netfront xen_blkfront crc32c_intel ata_piix psmouse cirrus ttm drm_kms_helper drm i2c_piix4 uhci_hcd ehci_hcd usbcore usb_common libata scsi_mod floppy button
S Sun Dec 10 12:10:27 2017 p4 kernel: CPU: 0 PID: 1490 Comm: auplink Tainted: G           O    4.9.0-4-amd64 #1 Debian 4.9.65-3
S Sun Dec 10 12:10:27 2017 p4 kernel: Hardware name: Xen HVM domU, BIOS 4.4.1-xs116341 01/13/2016
S Sun Dec 10 12:10:27 2017 p4 kernel:  0000000000000000 ffffffffa8928e84 ffffbba581ee7a60 0000000000000000
S Sun Dec 10 12:10:27 2017 p4 kernel:  ffffffffa8675efe ffffbba581ee7d58 ffffbba581ee7ab8 0000000000000000
S Sun Dec 10 12:10:27 2017 p4 kernel:  ffff9512c3ab3800 ffff9512c50e2d00 ffff95128a6ec780 ffffffffa8675f7f
S Sun Dec 10 12:10:27 2017 p4 kernel: Call Trace:
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa8928e84>] ? dump_stack+0x5c/0x78
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa8675efe>] ? __warn+0xbe/0xe0
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa8675f7f>] ? warn_slowpath_fmt+0x5f/0x80
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc064aaec>] ? au_cp_regular+0x16c/0x250 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc064abc1>] ? au_cp_regular+0x241/0x250 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc064ab37>] ? au_cp_regular+0x1b7/0x250 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc064b30c>] ? cpup_entry+0x73c/0x890 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc0648674>] ? vfsub_lookup_one_len+0x44/0xf0 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa8935546>] ? sprintf+0x56/0x70
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc064b5e7>] ? au_cpup_single.constprop.23+0x187/0x760 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa881a658>] ? dput+0x38/0x250
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc064bfeb>] ? au_cpup_simple+0x5b/0xa0 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc064c0ff>] ? au_do_sio_cpup_simple+0xcf/0xf0 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc06609d3>] ? au_pin_and_icpup+0x2a3/0x4e0 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc06610f4>] ? aufs_setattr+0x4e4/0x620 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa88285b2>] ? xattr_resolve_name+0xa2/0xc0
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa882063f>] ? notify_change+0x2ef/0x460
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa87ff0f5>] ? chown_common+0x165/0x1c0
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa8957138>] ? strncpy_from_user+0x48/0x160
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa8800274>] ? SyS_chown+0x94/0xd0
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa8c075fb>] ? system_call_fast_compare_end+0xc/0x9b
S Sun Dec 10 12:10:27 2017 p4 kernel: ---[ end trace fc137d6061ab0b9c ]---
S Sun Dec 10 12:10:27 2017 p4 kernel: ------------[ cut here ]------------
S Sun Dec 10 12:10:27 2017 p4 kernel: WARNING: CPU: 0 PID: 1490 at /var/lib/dkms/aufs/4.9+20161219/build/fs/aufs/cpup.c:423 au_cp_regular+0x16c/0x250 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel: .wh..wh.resources-i.ri.000b
Please report this warning to aufs-users ML
S Sun Dec 10 12:10:27 2017 p4 kernel: Modules linked in:
S Sun Dec 10 12:10:27 2017 p4 kernel:  aufs(O) xenfs xen_privcmd joydev hid_generic usbhid hid ppdev sg pcspkr parport_pc parport serio_raw evdev ip_tables x_tables autofs4 ext4 crc16 jbd2 crc32c_generic fscrypto ecb glue_helper lrw gf128mul ablk_helper cryptd aes_x86_64 mbcache sr_mod cdrom ata_generic xen_netfront xen_blkfront crc32c_intel ata_piix psmouse cirrus ttm drm_kms_helper drm i2c_piix4 uhci_hcd ehci_hcd usbcore usb_common libata scsi_mod floppy button
S Sun Dec 10 12:10:27 2017 p4 kernel: CPU: 0 PID: 1490 Comm: auplink Tainted: G        W  O    4.9.0-4-amd64 #1 Debian 4.9.65-3
S Sun Dec 10 12:10:27 2017 p4 kernel: Hardware name: Xen HVM domU, BIOS 4.4.1-xs116341 01/13/2016
S Sun Dec 10 12:10:27 2017 p4 kernel:  0000000000000000 ffffffffa8928e84 ffffbba581ee7a60 0000000000000000
S Sun Dec 10 12:10:27 2017 p4 kernel:  ffffffffa8675efe ffffbba581ee7d58 ffffbba581ee7ab8 0000000000000000
S Sun Dec 10 12:10:27 2017 p4 kernel:  ffff9512c3ab3800 ffff95128a932000 ffff951289d38300 ffffffffa8675f7f
S Sun Dec 10 12:10:27 2017 p4 kernel: Call Trace:
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa8928e84>] ? dump_stack+0x5c/0x78
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa8675efe>] ? __warn+0xbe/0xe0
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa8675f7f>] ? warn_slowpath_fmt+0x5f/0x80
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc064aaec>] ? au_cp_regular+0x16c/0x250 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc064abc1>] ? au_cp_regular+0x241/0x250 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc064ab37>] ? au_cp_regular+0x1b7/0x250 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc064b30c>] ? cpup_entry+0x73c/0x890 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc0648674>] ? vfsub_lookup_one_len+0x44/0xf0 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa8935546>] ? sprintf+0x56/0x70
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc064b5e7>] ? au_cpup_single.constprop.23+0x187/0x760 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa881a658>] ? dput+0x38/0x250
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc064bfeb>] ? au_cpup_simple+0x5b/0xa0 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc064c0ff>] ? au_do_sio_cpup_simple+0xcf/0xf0 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc06609d3>] ? au_pin_and_icpup+0x2a3/0x4e0 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffc06610f4>] ? aufs_setattr+0x4e4/0x620 [aufs]
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa88285b2>] ? xattr_resolve_name+0xa2/0xc0
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa882063f>] ? notify_change+0x2ef/0x460
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa87ff0f5>] ? chown_common+0x165/0x1c0
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa8957138>] ? strncpy_from_user+0x48/0x160
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa8800274>] ? SyS_chown+0x94/0xd0
S Sun Dec 10 12:10:27 2017 p4 kernel:  [<ffffffffa8c075fb>] ? system_call_fast_compare_end+0xc/0x9b
S Sun Dec 10 12:10:27 2017 p4 kernel: ---[ end trace fc137d6061ab0b9d ]---
S Sun Dec 10 12:10:27 2017 p4 kernel: ------------[ cut here ]------------

The errors stop eventually after 10s, and then docker seems to work fine.

This is with the following kernel:

Linux core.hacksaar.de 4.9.0-4-amd64 #1 SMP Debian 4.9.65-3 (2017-12-03) x86_64 GNU/Linux

I just did an `apt upgrade`, which installed a new kernel.  I have not seen this
error before, but it is possible that I missed it.

Kind regards,
Ralf