Deadlocks! help, please!

["Gergely Gábor" <elentirmo.gilgalad-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Hello!

Yesterday I have made the transition from xfs to nilfs on the /home partition of my notebook, and since then, with the same usage as before,i have experienced deadlocks 3 times.

The situations were the following:

using gimp to cut a picture
browsing web with epiphany browser
epiphany again

rtorrent was running in the background.

What I experienced:

suddenly hdd activity starts. possibly because of swapping (i have 512m ram, and only gimp/epiphany are likely to eat much ram, i use wmaker and console based programs mostly)

i can't kill gimp/epi, i can log in at other VT-s with root, but not with user. thing that touch /home (even ls!), sync simply get stuck, and even kill -9 can't kill the stuck program. therefore i must assume it got stuck in some syscall, in kernel mode or something similiar, possibly in the nilfs2 module. I must assume this, as the hangs seemed to be in connection with /home.

i couldn't restart the computer cleanly,had to power-cycle it, and after restart the system got alive as expected (i noticed there is no fsck util. isn't fsck needed? is a roll forward from last cp done at mount? ) The garbage collector couldn't have donethis,, in theory, as i ordered it to have a 3 day long protection interval.

my GC put the following message to the logs:

Jan 16 01:19:00 vosztok nilfs_cleanerd[29597]: start
Jan 16 01:19:00 vosztok nilfs_cleanerd[29597]: cannot create cleanerd on /dev/vosztok_vg/home
Jan 16 01:19:00 vosztok nilfs_cleanerd[29597]: shutdown
Jan 16 17:51:54 vosztok nilfs_cleanerd[4254]: close /var/run/nilfs_cleanerd-dm-1.pid
Jan 16 17:51:54 vosztok nilfs_cleanerd[4254]: unlink /var/run/nilfs_cleanerd-dm-1.pid
Jan 16 17:51:54 vosztok nilfs_cleanerd[4254]: shutdown
Jan 16 17:54:34 vosztok nilfs_cleanerd[9661]: start
Jan 16 17:54:35 vosztok nilfs_cleanerd[9661]: open /var/run/nilfs_cleanerd-dm-1.pid

And the module gave these messages:

Jan 16 17:54:34 vosztok kernel: NILFS warning (device dm-1): nilfs_sync_super: barrier-based sync failed. disabling barriers
Jan 16 17:54:34 vosztok nilfs_cleanerd[9661]: start
Jan 16 17:54:35 vosztok nilfs_cleanerd[9661]: open /var/run/nilfs_cleanerd-dm-1.pid


Please help me, (as tough i love nilfs even after this short interval of use, this quite reduces the user experience :) ) and tell me how, and what information should I provide to help you fix the problem.

Thanks in advance:
-- 
Gergely Gábor <elentirmo.gilgalad-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

* random fortune:
Little girls, like butterflies, need no excuse.
		-- Lazarus Long

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