On Mon, 2013-04-08 at 01:11 +0200, Thanatermesis wrote: > I have recently found that aufs sometimes fails when installing > packages with the default debian/wheezy kernel, the release of debian > is very near so I think that is important to see how important is this > problem, I found it after to see that "strange things happens on live > mode" (sorry, I dont remember them right now) which conducted me to > found these messages in dmesg: > > [ 254.060377] ------------[ cut here ]------------ > [ 254.060439] WARNING: > at /build/buildd-linux_3.2.39-2-i386-4VFKqr/linux-3.2.39/fs/aufs/plink.c:418 > au_plink_append+0xed/0x272 [aufs]() > [ 254.060441] Hardware name: VirtualBox > [ 254.060442] unexpectedly many pseudo links, 101
This doesn't look like a failure, it looks like a warning about a case where aufs is not very efficient. Whenever you upgrade a package, dpkg creates temporary hard links to preserve the files from the old version in case it needs to abort the upgrade. It is not possible to create hard links between filesystems, so if you create a hard link to a file that has not been copied-up, aufs will create a 'pseudo link' on the upper filesystem which seems to be similar to a whiteout entry. aufs appears to maintain a single list of pseudo links per aufs filesystem, which will make it slow whenever there are a lot of them. Hence the warning. Ben. > [ 254.060444] Modules linked in: snd_pcm_oss snd_mixer_oss psmouse > serio_raw evdev pcspkr snd_intel8x0 snd_ac97_codec snd_pcm > snd_page_alloc snd_timer i2c_piix4 parport_pc snd parport i2c_core > soundcore ac97_bus ac power_supply processor button thermal_sys > squashfs loop aufs(C) nls_utf8 isofs sd_mod crc_t10dif sg sr_mod cdrom > ohci_hcd ata_generic ehci_hcd ahci usbcore libahci ata_piix usb_common > libata e1000 scsi_mod [last unloaded: scsi_wait_scan] > [ 254.060479] Pid: 3739, comm: dpkg Tainted: G C > 3.2.0-4-686-pae #1 Debian 3.2.39-2 > [ 254.060480] Call Trace: > [ 254.060497] [<c10383c4>] ? warn_slowpath_common+0x68/0x79 > [ 254.060503] [<f833e649>] ? au_plink_append+0xed/0x272 [aufs] > [ 254.060506] [<c103843d>] ? warn_slowpath_fmt+0x29/0x2d > [ 254.060520] [<f833e649>] ? au_plink_append+0xed/0x272 [aufs] > [ 254.060534] [<f833243d>] ? au_sio_cpup_single+0xa0/0xb4 [aufs] > [ 254.060543] [<c10da517>] ? dput+0x21/0xc2 > [ 254.060549] [<f833bb24>] ? aufs_link+0x36a/0x67c [aufs] > [ 254.060554] [<f833a651>] ? h_permission.isra.20+0x8e/0xda [aufs] > [ 254.060557] [<c10d5128>] ? vfs_link+0x9d/0xde > [ 254.060558] [<c10d69af>] ? sys_linkat+0x147/0x180 > [ 254.060560] [<c10d69fb>] ? sys_link+0x13/0x17 > [ 254.060568] [<c12c2644>] ? syscall_call+0x7/0xb > [ 254.060571] [<c12c0000>] ? ec_install_handlers+0x74/0x85 > [ 254.060573] ---[ end trace 8049851b73698197 ]--- > > Please contact me for any possible test required with the issue, Im > also available on IRC freenode at the Thanatermesis nickname > > Thanks > Thanatermesis -- Ben Hutchings Life would be so much easier if we could look at the source code.
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