linux-kernel - 2.6.22-rc1-mm1 huge pages VM freeze (maybe?)

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Message-Id: <1185918261.6981.13.camel@localhost>
Date:	Tue, 31 Jul 2007 15:44:21 -0600
From:	Zan Lynx <zlynx@....org>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: 2.6.22-rc1-mm1 huge pages VM freeze (maybe?)

I was playing with huge pages and libhugetlbfs.  Small programs like
"ls" work fine.  I tried running Evolution through libhugetlbfs and the
system slowly stops running.  One interesting thing is the "ps" command,
it gets stuck like this:

ps            D ffff81001e57ed40     0 103558 103483
 ffff81001f061dc8 0000000000000096 ffff81003d8586e8 ffff81001cbadc00
 0000000000000006 ffffffff80537009 0000000000000030 ffffffff807ff700
 ffffffff807ff700 ffffffff807ff700 ffffffff807ff700 ffffffff807ff700
Call Trace:
 [<ffffffff80537009>] _spin_unlock+0x29/0x50
 [<ffffffff80536425>] __down_read+0x75/0xaf
 [<ffffffff80295f49>] access_process_vm+0x49/0x190
 [<ffffffff802f3003>] proc_pid_cmdline+0xa3/0x130
 [<ffffffff802f4cea>] proc_info_read+0xba/0x100
 [<ffffffff802b0085>] vfs_read+0xc5/0x180
 [<ffffffff802b0583>] sys_read+0x53/0x90
 [<ffffffff8020c1de>] system_call+0x7e/0x83

and nothing will touch it after that.

Here's my kernel command line:
root=/dev/sda2 rootfstype=reiser4 rootflags=no_write_barrier ro
i8042.nomux elevator=cfq resume=/dev/sda3 panic=5 nmi_watchdog=2,panic
debug hugepages=32

Here's the "huge" script I was using to run programs:
#!/bin/sh
export LD_PRELOAD=libhugetlbfs.so
export HUGETLB_MORECORE=yes
export HUGETLB_PATH=/mnt/huge
export HUGETLB_VERBOSE=1
exec "$@"

I don't have any more info than that at the moment but I could reproduce
it with whatever, on request.

-- 
Zan Lynx <zlynx@....org>

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