linux-kernel - Re: [uml-devel] [PATCH] x86, hweight: Fix UML boot crash

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Date:	Mon, 14 Jun 2010 12:26:11 +0200
From:	Paolo Giarrusso <p.giarrusso@...il.com>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	Borislav Petkov <borislav.petkov@....com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Borislav Petkov <bp@...en8.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"user-mode-linux-devel@...ts.sourceforge.net" 
	<user-mode-linux-devel@...ts.sourceforge.net>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [uml-devel] [PATCH] x86, hweight: Fix UML boot crash

2010/6/14 Toralf Förster <toralf.foerster@....de>:
>
> Borislav Petkov wrote at 16:10:58
>> Did you do 'make mrproper' before rebuilding UML with it?
>
> Today I started with a clean git tree (cloned Linus tree) and got this :
>
> foerste@n22 ~ $ start_uml.sh

Can you enable frame pointers to get an accurate stack trace? x86 can
be accurate without, but I don't think this was ever implemented for
UML.
Because I'm not sure if below cfq_close_cooperator is being called
again, or if it's just garbage (as I guess). Anyway, it's still likely
that the crash is on hweight32.

Also, it'd be interesting to diff your configuration with the one used
by people the patch works for. Say,
$ grep HWEIGHT .config
(if there are any CFLAGS set in ARcH_HWEIGHT_CFLAGS, that would be a
problem as far as I see).

> EIP: 0073:[<081c4fcb>] CPU: 0 Not tainted ESP: 007b:08300b40 EFLAGS: 00010297
>    Not tainted
> EAX: 00000000 EBX: 190d2000 ECX: ffff8aea EDX: 00000000
> ESI: 191f4930 EDI: 191ef900 EBP: 191f4930 DS: 007b ES: 007b
> 08300794:  [<0805e65f>] segv_handler+0x3f/0x60
> 083007a4:  [<081c4fcb>] cfq_close_cooperator+0x4b/0x180
> 083007b0:  [<0806eec5>] sig_handler_common+0x55/0xa0
> 083007f0:  [<081c4fcb>] cfq_close_cooperator+0x4b/0x180
> 08300828:  [<0806f063>] sig_handler+0x23/0x40
> 08300830:  [<0806f2bd>] handle_signal+0x5d/0xa0
> 08300850:  [<080715f7>] hard_handler+0x17/0x20
> 0830089c:  [<081c4fcb>] cfq_close_cooperator+0x4b/0x180
> 08300a4c:  [<0807a3eb>] T.696+0x9b/0xc0
> 08300a74:  [<08079425>] enqueue_task+0x45/0x60
> 08300a94:  [<0807945f>] activate_task+0x1f/0x30
> 08300aa0:  [<080794d8>] try_to_wake_up+0x68/0xa0
> 08300acc:  [<0809369f>] autoremove_wake_function+0x2f/0x60
> 08300ae8:  [<0807754f>] __wake_up_common+0x4f/0x80
> 08300b18:  [<08077837>] __wake_up+0x47/0x60
> 08300b3c:  [<081c4fc6>] cfq_close_cooperator+0x46/0x180
> 08300b58:  [<081c5440>] cfq_completed_request+0x2a0/0x560
> 08300b90:  [<081b7fce>] elv_completed_request+0x7e/0xf0
> 08300ba8:  [<081b98f6>] __blk_put_request+0x36/0xf0
> 08300bc0:  [<081b9b26>] blk_finish_request+0x176/0x1d0
> 08300be0:  [<081b9ea1>] blk_end_bidi_request+0x41/0x60
> 08300bf4:  [<08068e8d>] ubd_intr+0x2d/0xf0
> 08300c14:  [<080a6b32>] handle_IRQ_event+0x32/0xc0
> 08300c34:  [<080a6c1b>] __do_IRQ+0x5b/0xb0
> 08300c50:  [<0805b364>] do_IRQ+0x24/0x40
> 08300c5c:  [<0805b59b>] sigio_handler+0x5b/0x80
> 08300c70:  [<0806eec5>] sig_handler_common+0x55/0xa0
> 08300c80:  [<0806efb5>] real_alarm_handler+0x35/0x40
> 08300cbc:  [<080739f0>] __delay+0x20/0x30
> 08300ce8:  [<0806f063>] sig_handler+0x23/0x40
> 08300cf0:  [<0806f2bd>] handle_signal+0x5d/0xa0
> 08300d10:  [<080715f7>] hard_handler+0x17/0x20


-- 
Paolo Giarrusso - Ph.D. Student
http://www.informatik.uni-marburg.de/~pgiarrusso/
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