I've made it through the initial build and the problem does in fact still
occur. I completed the build with CONFIG_AUFS_DEBUG=y and as one would
expect, the problem still occurs. Â Interestingly, I cannot reproduce 100%
of the time in the way previously described. Here is what does work to
reproduce for me 100% of the time currently:
mkdir -p a/b; cd .; rm -rf a; ls;
The end result is always a stale file handle. If you 'cd .' following this
set of commands the error clears, unless you are in the top level of the
aufs filesystem. If you are in the top level, you must umount/mount the
aufs file system to recover.
For the most part I did not get anything in my kernel debug logs, but after
hammering on it a bit I did get the following in my logs which appears to be
related:
Feb  3 23:54:38 aufs kernel: [ 3577.351197] ------------[ cut here
]------------
Feb  3 23:54:38 aufs kernel: [ 3577.351206] WARNING: CPU: 0 PID: 3725 at
/build/buildd/linux-3.16.0/fs
/inode.c:282 drop_nlink+0x41/0x50()
Feb  3 23:54:38 aufs kernel: [ 3577.351208] Modules linked in: aufs
snd_hda_codec_generic kvm_amd kvm crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel ppdev aesni_intel aes_x86_64 lrw gf128mul glue_helper
ablk_helper cryptd snd_hda_intel snd_hda_controller snd_hda_codec qxl
snd_hwdep snd_pcm ttm drm_kms_helper snd_timer serio_raw drm snd soundcore
parport_pc pvpanic parport i2c_piix4 mac_hid btrfs xor raid6_pq psmouse
floppy pata_acpi
Feb  3 23:54:38 aufs kernel: [ 3577.351233] CPU: 0 PID: 3725 Comm: rm
Tainted: G Â Â Â Â W Â Â 3.16.0-23-generic #31-Ubuntu
Feb  3 23:54:38 aufs kernel: [ 3577.351234] Hardware name: QEMU Standard PC
(i440FX + PIIX, 1996), BIOS 1.7.5-20140531_171129-lamiak 04/01/2014
Feb  3 23:54:38 aufs kernel: [ 3577.351236]  0000000000000009
ffff88003a07fcc8 ffffffff8177fcbc 0000000000000000
Feb  3 23:54:38 aufs kernel: [ 3577.351238]  ffff88003a07fd00
ffffffff8106fd8d ffff88003a742058 ffff88003a742058
Feb  3 23:54:38 aufs kernel: [ 3577.351240]  0000000000000000
ffff88003b3ac240 ffff88003b92b100 ffff88003a07fd10
Feb  3 23:54:38 aufs kernel: [ 3577.351251] Call Trace:
Feb  3 23:54:38 aufs kernel: [ 3577.351257]  [<ffffffff8177fcbc>]
dump_stack+0x45/0x56
Feb  3 23:54:38 aufs kernel: [ 3577.351261]  [<ffffffff8106fd8d>]
warn_slowpath_common+0x7d/0xa0
Feb  3 23:54:38 aufs kernel: [ 3577.351263]  [<ffffffff8106fe6a>]
warn_slowpath_null+0x1a/0x20
Feb  3 23:54:38 aufs kernel: [ 3577.351265]  [<ffffffff811fc5f1>]
drop_nlink+0x41/0x50
Feb  3 23:54:38 aufs kernel: [ 3577.351273]  [<ffffffffc0510c1d>]
au_whtmp_rmdir+0x19d/0x1b0 [aufs]
Feb  3 23:54:38 aufs kernel: [ 3577.351278]  [<ffffffffc050fe5e>] ?
au_whtmp_ren+0x6e/0xe0 [aufs]
Feb  3 23:54:38 aufs kernel: [ 3577.351283]  [<ffffffffc051f2e7>]
aufs_rmdir+0x2b7/0x430 [aufs]
Feb  3 23:54:38 aufs kernel: [ 3577.351285]  [<ffffffff811f7d50>] ?
prepend.constprop.25+0x30/0x30
Feb  3 23:54:38 aufs kernel: [ 3577.351288]  [<ffffffff811eef57>]
vfs_rmdir+0xa7/0x100
Feb  3 23:54:38 aufs kernel: [ 3577.351290]  [<ffffffff811f1a79>]
do_rmdir+0x1d9/0x1f0
Feb  3 23:54:38 aufs kernel: [ 3577.351293]  [<ffffffff811e285e>] ?
____fput+0xe/0x10
Feb  3 23:54:38 aufs kernel: [ 3577.351295]  [<ffffffff810919ac>] ?
task_work_run+0xbc/0xf0
Feb  3 23:54:38 aufs kernel: [ 3577.351299]  [<ffffffff810130f7>] ?
do_notify_resume+0x97/0xb0
Feb  3 23:54:38 aufs kernel: [ 3577.351301]  [<ffffffff811f2d25>]
SyS_unlinkat+0x25/0x40
Feb  3 23:54:38 aufs kernel: [ 3577.351304]  [<ffffffff81787ced>]
system_call_fastpath+0x1a/0x1f
Feb  3 23:54:38 aufs kernel: [ 3577.351391] ---[ end trace d717630435aab60d
]---
I could not get this to occur on a regular basis, but it popped up at some
point. Hopefully that is of some help.
Here are all the aufs config options for my current build:
CONFIG_AUFS_FS=m
CONFIG_AUFS_BRANCH_MAX_127=y
# CONFIG_AUFS_BRANCH_MAX_511 is not set
# CONFIG_AUFS_BRANCH_MAX_1023 is not set
# CONFIG_AUFS_BRANCH_MAX_32767 is not set
CONFIG_AUFS_SBILIST=y
# CONFIG_AUFS_HNOTIFY is not set
CONFIG_AUFS_EXPORT=y
CONFIG_AUFS_INO_T_64=y
# CONFIG_AUFS_RDU is not set
# CONFIG_AUFS_SP_IATTR is not set
# CONFIG_AUFS_SHWH is not set
# CONFIG_AUFS_BR_RAMFS is not set
# CONFIG_AUFS_BR_FUSE is not set
# CONFIG_AUFS_BR_HFSPLUS is not set
CONFIG_AUFS_BDEV_LOOP=y
CONFIG_AUFS_DEBUG=y
CONFIG_AUFS_MAGIC_SYSRQ=y
I have not yet applied the patch, but I will give it a try tomorrow to see
if it makes a difference in behavior or log messages.
On Tue, Feb 3, 2015 at 8:06 PM, <[1]sf...@users.sourceforge.net> wrote:
MJ, Dan,
I appriciate your efforts.
Dan Kegel:
> That failed with "no config found", so I repeated it after doing
> $ cp -vi /boot/config-`uname -r` .config
> It then asked two questions; I said yes to X86_16BIT and no to
> IPMI_SI_PROBE_DEFAULTS.
    :::
 (and about the uppercase in aufsD)
Sorry about that.
I myself didn't use make-kpg to build ubuntu trusty kernel. I did all
manually.
- cd ubuntu-trusty.git
- cp "MJ's config-3.13.0-35-generic" .config
- make menuconfig
 edit CONFIG_LOCALVERSION="aufsD"
- make
- make headers_install
- make modules_install
- cp -p arch/x86/boot/bzImage /boot/vmlinuz-brabra
- cp -p System.map /boot/System.map-brabra
- edit /boot/grub/grub.cfg and add the entry
Essentially these steps and make-kpg should be equivalent, and the
purpose is to build/re-build and install the kernel. If you or any
ubuntu user have a better way to do it, don't hesitate to stop using
make-kpg.
Thanks again
J. R. Okajima
--
Michael Johnson - MJ
References
1. mailto:sf...@users.sourceforge.net
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