Re: [Moosefs-users] khugepaged/fuse issue on RH6/SL6

[Laurent W. <lw...@hy...>]

Unburying this thread :)
Have you found any working solution about it ?
I've tried 
echo never > /sys/kernel/mm/redhat_transparent_hugepage/defrag
echo no > /sys/kernel/mm/redhat_transparent_hugepage/khugepaged/defrag
but I still get (less though) task stuck etc etc running C6 x86_64.
Even « funnier », a user have been able to trigger it under C5
x86_64, running a user-space program (data processing, data being
located on mfs volume ) ! Here's the C5 trace…

INFO: task polymer-na-spg:17348 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message. polymer-na-sp D ffff810001025e20     0 17348
17347                     (NOTLB) ffff81018b9d5c08 0000000000000086
ffff810210a141d0 ffffffff8863b219 ffff81081e89d000 0000000000000007
ffff81037fb040c0 ffff81042e1f57e0 003ab01ace8dae8c 0000000000007bc3
ffff81037fb042a8 000000048863ff35 Call Trace:
 [<ffffffff8863b219>] :fuse:flush_bg_queue+0x2b/0x48
 [<ffffffff8006e1db>] do_gettimeofday+0x40/0x90
 [<ffffffff80028a85>] sync_page+0x0/0x43
 [<ffffffff800637ea>] io_schedule+0x3f/0x67
 [<ffffffff80028ac3>] sync_page+0x3e/0x43
 [<ffffffff8006392e>] __wait_on_bit_lock+0x36/0x66
 [<ffffffff8003fbc7>] __lock_page+0x5e/0x64
 [<ffffffff800a0a06>] wake_bit_function+0x0/0x23
 [<ffffffff8000c2e4>] do_generic_mapping_read+0x1df/0x359
 [<ffffffff8000d0fd>] file_read_actor+0x0/0x159
 [<ffffffff8000c5aa>] __generic_file_aio_read+0x14c/0x198
 [<ffffffff800c6774>] generic_file_read+0xac/0xc5
 [<ffffffff800a09d8>] autoremove_wake_function+0x0/0x2e
 [<ffffffff8000e129>] do_mmap_pgoff+0x615/0x780
 [<ffffffff8012d629>] selinux_file_permission+0x9f/0xb6
 [<ffffffff8000b69a>] vfs_read+0xcb/0x171
 [<ffffffff80011bac>] sys_read+0x45/0x6e
 [<ffffffff8005d28d>] tracesys+0xd5/0xe0

(and so on)
Thanks !
-- 
Laurent Wandrebeck
HYGEOS, Earth Observation Department / Observation de la Terre
Euratechnologies
165 Avenue de Bretagne
59000 Lille, France
tel: +33 3 20 08 24 98
http://www.hygeos.com
GPG fingerprint/Empreinte GPG: F5CA 37A4 6D03 A90C 7A1D  2A62 54E6 EF2C
D17C F64C