Messages in this thread | | | Date | Tue, 17 Jun 2008 18:15:27 +0900 | From | Daisuke Nishimura <> | Subject | Re: [Bad page] trying to free locked page? (Re: [PATCH][RFC] fix kernel BUG at mm/migrate.c:719! in 2.6.26-rc5-mm3) |
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On Tue, 17 Jun 2008 18:03:14 +0900, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote: > On Tue, 17 Jun 2008 16:47:09 +0900 > Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> wrote: > > > On Tue, 17 Jun 2008 16:35:01 +0900, Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> wrote: > > > Hi. > > > > > > I got this bug while migrating pages only a few times > > > via memory_migrate of cpuset. > > > > > > Unfortunately, even if this patch is applied, > > > I got bad_page problem after hundreds times of page migration > > > (I'll report it in another mail). > > > But I believe something like this patch is needed anyway. > > > > > > > I got bad_page after hundreds times of page migration. > > It seems that a locked page is being freed. > > > Good catch, and I think your investigation in the last e-mail was correct. > I'd like to dig this...but it seems some kind of big fix is necessary. > Did this happen under page-migraion by cpuset-task-move test ? > Yes.
I made 2 cpuset directories, run some processes in each cpusets, and run a script like below infinitely to move tasks and migrate pages.
--- #!/bin/bash
G1=$1 G2=$2
move_task() { for pid in $1 do echo $pid >$2/tasks 2>/dev/null done }
G1_TASK=`cat ${G1}/tasks` G2_TASK=`cat ${G2}/tasks`
move_task "${G1_TASK}" ${G2} & move_task "${G2_TASK}" ${G1} &
wait ---
I got this bad_page after running this script for about 600 times.
Thanks, Daisuke Nishimura.
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