[uml-devel] [Bug 111575] sys-kernel/usermode-sources-2.6.14: kernel panic

[uml-devel] [Bug 111575] sys-kernel/usermode-sources-2.6.14: kernel panic

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Clear-Text: http://bugs.gentoo.org/show_bug.cgi?id=111575
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blaisorblade_spam@yahoo.it changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |user-mode-linux-
                   |                            |devel@lists.sourceforge.net




------- Comment #14 from blaisorblade_spam@yahoo.it  2006-01-17 15:49 PST -------
The only setting in the .config which is untested is:

CONFIG_MPENTIUMM=y

give a try to CONFIG_M386. Also, test disabling CONFIG_MODE_TT to see if it
helps.

Additionally, since the problem is with mem=256M, I would check the first entry
in this FAQ. The error message is different, but that could be due to internal
changes in UML, but I would still check that.

http://uml.harlowhill.com/index.php/Troubleshooting#probsrunning

Somebody: please append "when assigning more than 256M" to the subject.


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[uml-devel] [Bug 111575] sys-kernel/usermode-sources-2.6.14: kernel panic when assigning more than 256M

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Clear-Text: http://bugs.gentoo.org/show_bug.cgi?id=111575
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dsd@gentoo.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|sys-kernel/usermode-sources-|sys-kernel/usermode-sources-
                   |2.6.14: kernel panic        |2.6.14: kernel panic when
                   |                            |assigning more than 256M




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[uml-devel] [Bug 111575] sys-kernel/usermode-sources-2.6.14: kernel panic when assigning more than 256M

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------- Comment #15 from toralf.foerster@gmx.de  2006-01-18 04:00 PST -------
Hi,
has no effect: echo 262144 > /proc/sys/vm/max_map_count

switching to CONFIG_M686=y works ! (even with mem=256M)

switching to CONFIG_MODE_TT not tested

wwitching to CONFIG_M386 I got a compile error:

/usr/src/uml # make CC='ccache gcc' ARCH=um linux
  CHK     arch/um/include/uml-config.h
  UPD     arch/um/include/uml-config.h
ccache gcc -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs
-fno-strict-aliasing -fno-common -ffreestanding -Os -fomit-frame-pointer
-D__arch_um__ -DSUBARCH=\"i386\" -Dvmap=kernel_vmap
-Din6addr_loopback=kernel_in6addr_loopback -Iarch/um/include 
-I/usr/src/linux-2.6.15-gentoo/arch/um/kernel/tt/include 
-I/usr/src/linux-2.6.15-gentoo/arch/um/kernel/skas/include
-D_FILE_OFFSET_BITS=64 -march=i386 -mpreferred-stack-boundary=2 -D_GNU_SOURCE
-D_LARGEFILE64_SOURCE -S -o arch/um/user-offsets.s
arch/um/sys-i386/user-offsets.c
  CHK     arch/um/include/user_constants.h
  CHK     include/linux/version.h
  UPD     include/linux/version.h
  SYMLINK include/asm -> include/asm-um
  SPLIT   include/linux/autoconf.h -> include/config/*
ccache gcc -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs
-fno-strict-aliasing -fno-common -ffreestanding -Os     -fomit-frame-pointer 
-D__arch_um__ -DSUBARCH=\"i386\" -Iarch/um/include 
-I/usr/src/linux-2.6.15-gentoo/arch/um/kernel/tt/include 
-I/usr/src/linux-2.6.15-gentoo/arch/um/kernel/skas/include -Dvmap=kernel_vmap
-Din6addr_loopback=kernel_in6addr_loopback -Derrno=kernel_errno
-Dsigprocmask=kernel_sigprocmask -fno-unit-at-a-time -U__i386__ -Ui386
-march=i386 -mpreferred-stack-boundary=2 -D_LARGEFILE64_SOURCE
-Wdeclaration-after-statement   -nostdinc -isystem
/usr/lib/gcc/i686-pc-linux-gnu/3.4.4/include -D__KERNEL__ -Iinclude  -include
include/linux/autoconf.h -S -o arch/um/kernel-offsets.s
arch/um/sys-i386/kernel-offsets.c
In file included from include/asm/atomic.h:9,
                 from include/linux/spinlock.h:232,
                 from include/linux/capability.h:45,
                 from include/linux/sched.h:7,
                 from arch/um/sys-i386/kernel-offsets.c:3:
include/asm/arch/atomic.h: In function `atomic_add_return':
include/asm/arch/atomic.h:192: error: structure has no member named `x86'
make: *** [arch/um/kernel-offsets.s] Error 1


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[uml-devel] [Bug 111575] sys-kernel/usermode-sources-2.6.14: kernel panic when assigning more than 256M

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------- Comment #16 from blaisorblade_spam@yahoo.it  2006-01-18 04:11 PST -------
> switching to CONFIG_MODE_TT not tested
I suggested switching if off (just to make it clear).

> M386 gives error
Thanks, will fix this.


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[uml-devel] [Bug 111575] sys-kernel/usermode-sources-2.6.14: kernel panic when assigning more than 256M

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------- Comment #17 from blaisorblade_spam@yahoo.it  2006-01-18 04:13 PST -------
Forgot one question, and sorry, I don't want be be unkind - did you remember to
test the CONFIG_m686 case (the working one) with more than one boot?


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[uml-devel] [Bug 111575] sys-kernel/usermode-sources-2.6.14: kernel panic when assigning more than 256M

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------- Comment #18 from toralf.foerster@gmx.de  2006-01-18 05:06 PST -------
>with more than one boot?
oops, with M686 it doesn't work reliable, now it does not boot even if it
started before ?!?

>> switching to CONFIG_MODE_TT not tested
>I suggested switching if off (just to make it clear)
You're right, this is the root cause.
Now I can start the uml kernel either with CONFIG_M686 as well as with
CONFIG_MPENTIUMM and/or changing a lot of other kernel option, the uml kernel
now starts under all circumstances tested until now, and with the option
mem=256M :-)

>I don't want be be unkind 
heh, null problemo :-)


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[uml-devel] [Bug 111575] sys-kernel/usermode-sources-2.6.14: kernel panic when assigning more than 256M

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------- Comment #19 from dsd@gentoo.org  2006-02-11 02:35 PST -------
Bump. Any news on these stability issues?


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[uml-devel] [Bug 111575] sys-kernel/usermode-sources-2.6.14: kernel panic when assigning more than 256M

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------- Comment #20 from blaisorblade_spam@yahoo.it  2006-02-15 15:15 PST -------
The report says switching "CONFIG_MODE_TT" off helped.

And currently, there is no known reason for which a user should need to enable
TT mode.

So, this bug can be IMHO considered RESOLVED (since it's a configuration not
recommended, it would turn out to be RESOLVED INVALID, likely).


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[uml-devel] [Bug 111575] sys-kernel/usermode-sources-2.6.14: kernel panic when assigning more than 256M

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------- Comment #21 from dsd@gentoo.org  2006-02-15 16:11 PST -------
Toralf, are you happy with the resolution of turning TT mode off?


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[uml-devel] [Bug 111575] sys-kernel/usermode-sources-2.6.14: kernel panic when assigning more than 256M

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toralf.foerster@gmx.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED




------- Comment #22 from toralf.foerster@gmx.de  2006-02-16 00:34 PST -------
>Toralf, are you happy with the resolution of turning TT mode off?
Oh yes, of course, the UML works now fine and the option isn't really needed.
I close the bug.

Only one remark:
>since it's a configuration not recommended
The kernel menuconfig help says: "Normally, this should be set to Y"


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[uml-devel] [Bug 111575] sys-kernel/usermode-sources-2.6.14: kernel panic when assigning more than 256M

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------- Comment #23 from blaisorblade_spam@yahoo.it  2006-02-16 08:27 PST -------
> The kernel menuconfig help says: "Normally, this should be set to Y"
Yep, good note; however likely this has already been fixed.


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