[uml-devel] Managing 2.6 merge

[uml-devel] Managing 2.6 merge

[Paolo Giarrusso]

Jeff, could you please make sure you CC: me /the uml-devel list on every patch 
you send to Andrew Morton? I'm working on merging a lot of patches myself, so 
I'd like to be notified.

However, if you now are working on the mainline tree yourself, I'm going to 
send you a tarball containing my remaining patches. I've got a lot of them, 
right now.

Bye
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729


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Re: [uml-devel] Managing 2.6 merge

[Jeff Dike]

On Sat, Sep 18, 2004 at 07:44:58PM +0200, Paolo Giarrusso wrote:
> Jeff, could you please make sure you CC: me /the uml-devel list on every patch 
> you send to Andrew Morton? I'm working on merging a lot of patches myself, so 
> I'd like to be notified.

OK, easy enough.  BTW, I've seen cc-ing LKML, so it's not like I've been doing
it privately.

> However, if you now are working on the mainline tree yourself, I'm going to 
> send you a tarball containing my remaining patches. I've got a lot of them, 
> right now.

OK.  If you can point out the ones which you think should go into mainline
soon, that would make my life a bit easier.

				Jeff


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Re: [uml-devel] Managing 2.6 merge

[Paolo Giarrusso]

On Saturday 18 September 2004 22:52, Jeff Dike wrote:
> On Sat, Sep 18, 2004 at 07:44:58PM +0200, Paolo Giarrusso wrote:
> > Jeff, could you please make sure you CC: me /the uml-devel list on every
> > patch you send to Andrew Morton? I'm working on merging a lot of patches
> > myself, so I'd like to be notified.
>
> OK, easy enough.  BTW, I've seen cc-ing LKML, so it's not like I've been
> doing it privately.
Yes but subscribing to LKML is not an option for me at the moment (yes, it is 
possible to use archives, but slow).
> > However, if you now are working on the mainline tree yourself, I'm going
> > to send you a tarball containing my remaining patches. I've got a lot of
> > them, right now.

> OK.  If you can point out the ones which you think should go into mainline
> soon, that would make my life a bit easier.
Yes, ok - you will find the notes in the "series" file. Since I was going to 
merge also the patches from your tree, you may find them, too.

I will send some patches which need special care separately.

Bye
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729


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Re: [uml-devel] Managing 2.6 merge

[Paolo Giarrusso]

On Saturday 18 September 2004 22:52, Jeff Dike wrote:
> On Sat, Sep 18, 2004 at 07:44:58PM +0200, Paolo Giarrusso wrote:
> > Jeff, could you please make sure you CC: me /the uml-devel list on every
> > patch you send to Andrew Morton? I'm working on merging a lot of patches
> > myself, so I'd like to be notified.
>
> OK, easy enough.  BTW, I've seen cc-ing LKML, so it's not like I've been
> doing it privately.
>
> > However, if you now are working on the mainline tree yourself, I'm going
> > to send you a tarball containing my remaining patches. I've got a lot of
> > them, right now.
>
> OK.  If you can point out the ones which you think should go into mainline
> soon, that would make my life a bit easier.
Well, since I'm doing a lot of Makefile work, can you (when I send the 
patches) move 
http://user-mode-linux.sourceforge.net/work/current/2.6/2.6.8.1-1um/patches/clean
out of the way? I'm going to merge those changes in the ones I send you (with 
appropriate credit) and to correct them (for instance, TOPDIR is deprecated).

I have a lot of experience about kbuild, so I can put appropriate care about 
makefiles quality.

Bye
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729


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Re: [uml-devel] Managing 2.6 merge

[Gerd Knorr]

Paolo Giarrusso <blaisorblade_personal@yahoo.it> writes:

> I have a lot of experience about kbuild, so I can put appropriate care about 
> makefiles quality.

kbuild wishlist item #1: working parallel builds aka "make -j" for UML.

  Gerd

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Re: [uml-devel] Managing 2.6 merge - url for the patches sent to merge

[Paolo Giarrusso]

On Monday 20 September 2004 11:38, Gerd Knorr wrote:
> Paolo Giarrusso <blaisorblade_personal@yahoo.it> writes:
> > I have a lot of experience about kbuild, so I can put appropriate care
> > about makefiles quality.
>
> kbuild wishlist item #1: working parallel builds aka "make -j" for UML.
Done and posted to Jeff - the complete set of patches which I posted him is 
now available at this URL (no link in the page, sorry):

http://www.user-mode-linux.org/~blaisorblade/newSite/patches/guest/patches-to-merge-for-2.6.tar.bz2

Don't use uml-use-va_end.patch, it breaks UML on rebooting. The Makefile 
patches are near the end of "series".

Bye
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729


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Re: [uml-devel] Managing 2.6 merge - url for the patches sent to merge

[Jeff Dike]

blaisorblade_personal@yahoo.it said:
> Don't use uml-use-va_end.patch, it breaks UML on rebooting. 

How?  That patch looks completely safe to me.

Rebooting is broken (in tt mode anyway) because the file lock on the root
ubd file descriptor isn't dropped.  Mysteriously, setting that descriptor
CLOEXEC doesn't seem to help.

				Jeff



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Re: [uml-devel] Managing 2.6 merge - url for the patches sent to merge

[Gerd Knorr]

On Mon, Sep 20, 2004 at 08:30:49PM +0200, Paolo Giarrusso wrote:
> On Monday 20 September 2004 11:38, Gerd Knorr wrote:
> > kbuild wishlist item #1: working parallel builds aka "make -j" for UML.
> Done and posted to Jeff - the complete set of patches which I posted him is 
> now available at this URL (no link in the page, sorry):

Works great, thanks.  It took some time to figure that the kernel binary
is vmlinux now and not linux any more through, guess that will surprise
a few other people as well.  Is there some good reason for that change?

  Gerd

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Re: [uml-devel] Managing 2.6 merge - url for the patches sent to merge

[Paolo Giarrusso]

On Tuesday 21 September 2004 14:37, Gerd Knorr wrote:
> On Mon, Sep 20, 2004 at 08:30:49PM +0200, Paolo Giarrusso wrote:
> > On Monday 20 September 2004 11:38, Gerd Knorr wrote:
> > > kbuild wishlist item #1: working parallel builds aka "make -j" for UML.
> >
> > Done and posted to Jeff - the complete set of patches which I posted him
> > is now available at this URL (no link in the page, sorry):

> Works great, thanks.

> It took some time to figure that the kernel binary 
> is vmlinux now and not linux any more through, guess that will surprise
> a few other people as well.  Is there some good reason for that change?
Making kallsyms work, since that does a post-processing on vmlinux which 
results become invalid if you later relink it - adding a "mv vmlinux linux" 
is not a problem to avoid surprising people, I've just been waiting for "what 
to do here".

In fact, now, when UML outputs a stack trace, it also outputs the function 
names, as 2.6 i386 (and other archs) do. Check also uml-use-kallsyms about 
this. It should help bug reporters, too.

Finally, this also fixes the "empty /proc/kallsyms" problem.

Bye
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729


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Re: [uml-devel] Managing 2.6 merge - url for the patches sent to merge

[Paolo Giarrusso]

On Tuesday 21 September 2004 05:21, Jeff Dike wrote:
> blaisorblade_personal@yahoo.it said:
> > Don't use uml-use-va_end.patch, it breaks UML on rebooting.
>
> How?  That patch looks completely safe to me.
I'm not understanding why either, but with the patch applied, I get 
"Segmentation fault" soon after reboot. You can read a complete output below.
Also notice the "deactivate_all_fds failed, errno = 9", which is frequent even 
without the patch.

However, note that you may need SKAS and SYSEMU to trigger that (maybe).

> Rebooting is broken (in tt mode anyway) because the file lock on the root
> ubd file descriptor isn't dropped. 
No, I'm not getting this problem.

> Mysteriously, setting that descriptor 
> CLOEXEC doesn't seem to help.
No, this problem seems to go away on 2.6 hosts (at least, that's my random 
experience). It seems, so, a 2.4 host bug.

See this patch from Henrik Normstrod for a workaround:

http://marasystems.com/download/uml/10-flock.patch

Checking for the skas3 patch in the host...found
Checking for /proc/mm...found
Linux version 2.6.9-rc2merging-pass1 (paolo@zion.localdomain) (gcc version 
3.3.2 (Mandrake Linux 10.0 3.3.2-6mdk)) #7 Sun Sep 19 20:33:32 CEST 2004
[...]
Memory: 29128k available
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
Checking for host processor cmov support...Yes
Checking for host processor xmm support...No
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...found
Checking that host ptys support output SIGIO...Yes
Checking that host ptys support SIGIO on close...No, enabling workaround
Checking for /dev/anon on the host...Not available (open failed with errno 2)
NET: Registered protocol family 16
[...]
Initializing stdio console driver
VFS: Mounted root (ext2 filesystem) readonly.
INIT: version 2.84 booting
INIT: Entering runlevel: 5
INIT: Switching to runlevel: 6
INIT: Sending processes the TERM signal
reboot
Restarting system.

[This is always output at reboot, ALWAYS, if there is no segfault]
deactivate_all_fds failed, errno = 9

Checking for the skas3 patch in the host...found
Checking for /proc/mm...found
Linux version 2.6.9-rc2merging-pass1 (paolo@zion.localdomain) (gcc version 
3.3.2 (Mandrake Linux 10.0 3.3.2-6mdk)) #7 Sun Sep 19 20:33:32 CEST 2004
Built 1 zonelists
[bla bla bla]
VFS: Mounted root (ext2 filesystem) readonly.
INIT: version 2.84 booting
INIT: Entering runlevel: 5
INIT: Switching to runlevel: 6
INIT: Sending processes the TERM signal
reboot
Restarting system.

Segmentation fault

I've done a little debugging of that without success, but the problem is after 
coming back to main.

Bye
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729


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Re: [uml-devel] Managing 2.6 merge - url for the patches sent to merge

[Henrik Nordstrom]

On Tue, 21 Sep 2004, Paolo Giarrusso wrote:

>> Mysteriously, setting that descriptor
>> CLOEXEC doesn't seem to help.
> No, this problem seems to go away on 2.6 hosts (at least, that's my random
> experience). It seems, so, a 2.4 host bug.
>
> See this patch from Henrik Normstrod for a workaround:
>
> http://marasystems.com/download/uml/10-flock.patch

When I looked into this problem I concluded the fcntl locks in the host 
kernel got completely messed up by the cloning or something similar. Using 
flock works just as good assuming the ubd files is local and is not 
plauged by the same host bug. Most likely the host gets confused by the 
close being done from another pid than who issued the lock.

The host bug is not limited to rebooting only, the lock is permanent and 
will stay forever. In fact I suspect the CLOEXEC flag as such is working, 
it is just that the host does not realize the lock belongs to this fd.

This Linux kernel issue can probably be utilized to play some interesting 
DOS games on Linux systems where you have a account or otherwise the 
ability to run code, but I have not cared to investigate the exact details 
closely.

Regards
Henrik


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