[uml-devel] [ann] kraxel's 2.6.8 uml patch kit

[uml-devel] [ann] kraxel's 2.6.8 uml patch kit

[Gerd Knorr]

  Hi,

I've just uploaded a bunch of uml kernel patches to
http://www.suse.de/~kraxel/uml/patches/

This basically is the current state of the suse kernel for
the next suse linux release.  The patches create one source
tree for both i386 and uml kernels.  Some of these patches
have been mailed to this list in the past.  The README for
the patch kit is attached below for convenience.

What is the status of the amd64 port?  The 2.6.4 patch on
sf.net produces lots of rejects when I try to apply it on
top of the 2.6.7 uml patch.  Is a newer version available
somewhere?  Or can I just ignore all the rejects (guess not)?

What is the status if the umlfb/x11/pthread issue, i.e. uml
kernel crashing as soon as one tries to link against libpthread
(which is needed for libX11)?  Any progress here?

  Gerd

==============================[ cut here ]==============================

kraxel's 2.6.8 uml patch kit [2004-08-20]
=========================================

The patches must be applied in the order listed here.
Patch descriptions:

host-skas3-2.6.7-v1.patch
	blaisorblade's skas patch -- as-is

uml-patch-2.6.7-2
	jeff's uml patch -- with some stuff removed which is already
	in the skas patch.

uml-fix-skas
	some fixes needed to make the resulting tree build for both
	i386 and um archs.

uml-fixes-for-2.6.8
	some updates to make uml build on 2.6.8
	
uml-extraversion
	don't change the EXTRAVERSION

uml-raise-tty-limit
	use 16 instead of 8 ttys.

uml-pretend-to-be-i586
	make the uml virtual machine claim to be a i586 machine.  At
	least suse's yast2 installer will pick the glibc version without
	tls/nptl support then, thus this avoids trouble due to the the
	not-yet implemented tls/nptl syscalls in uml kernels.  Maybe
	useful for other distros as well.
	
uml-core-on-panic
	Make the uml kernel dump core on kernel panics for later analysis.
	Default: off, there is a kernel cmd line arg to enable that.

uml-fix-umldir-order
	fold the tree setup functions in umid.c into one, fixes some init
	call ordering issue I had some time ago.  Also makes the error
	messages more verbose.

uml-fix-export-symbol
	exports one missing symbol (needed for xfs).

uml-general-protection-fault
	attempt to handle general protection faults more correctly.

uml-net-flush-on-ifup
	flush incoming packets on ifup -- fixes networks stalls which happen in
	case the unix socket buffer is already full when the interface is up'ed
	(due to SIGIO never signaling arrived data).

uml-fix-mconsole-proc
	fix kernel crash triggered by running "uml_mconsole <umid> proc <some-file>"
	multipole times.

uml-terminal-cleanup
	tty / console handling cleanups.  The patchfile itself has a long
	description.



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Re: [uml-devel] [ann] kraxel's 2.6.8 uml patch kit

[Geert Uytterhoeven]

On Fri, 20 Aug 2004, Gerd Knorr wrote:
> What is the status if the umlfb/x11/pthread issue, i.e. uml
> kernel crashing as soon as one tries to link against libpthread
> (which is needed for libX11)?  Any progress here?

Use SKAS mode, not TT, so UML is dynamically linked and libpthread is not
needed. But no further progress since my last mail on August 2 (which you may
have missed due to being abroad, check the archives).

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds


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Re: [uml-devel] [ann] kraxel's 2.6.8 uml patch kit

[Gerd Knorr]

On Fri, Aug 20, 2004 at 03:14:55PM +0200, Geert Uytterhoeven wrote:
> On Fri, 20 Aug 2004, Gerd Knorr wrote:
> > What is the status if the umlfb/x11/pthread issue, i.e. uml
> > kernel crashing as soon as one tries to link against libpthread
> > (which is needed for libX11)?  Any progress here?
> 
> Use SKAS mode, not TT, so UML is dynamically linked and libpthread is not
> needed.

Ah, ok, thats the trick.  Now I have a X11 window.  I've build kernels
with both skas+tt until now ...

> But no further progress since my last mail on August 2 (which you may
> have missed due to being abroad, check the archives).

Yep, was offline at that time due to holidays.

  Gerd

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[uml-devel] Re: [ann] kraxel's 2.6.8 uml patch kit

[Jeff Dike]

kraxel@bytesex.org said:
> uml-core-on-panic
> 	Make the uml kernel dump core on kernel panics for later analysis.
> 	Default: off, there is a kernel cmd line arg to enable that. 

I like this, but I think it would be better done in a panic_notifier.

> uml-fix-mconsole-proc
> 	fix kernel crash triggered by running "uml_mconsole <umid> proc
> <some-file>"
> 	multipole times. 

I didn't do it this way on purpose.  I create an internal procfs mount in
case the UML root user has mounted something else on /proc.  I don't want
the mconsole on the host to be faked out by that.

> uml-net-flush-on-ifup
> 	flush incoming packets on ifup -- fixes networks stalls which happen
> in
> 	case the unix socket buffer is already full when the interface is
> up'ed
> 	(due to SIGIO never signaling arrived data). 

Applied, BTW, this one is mangled on your site:
	@@ -129,6 +129,7 @@ static int uml_net_open(struct net_devic

It's in my 2.4 tree and will get moved over to 2.6 in due course.

> uml-terminal-cleanup
> 	tty / console handling cleanups.  The patchfile itself has a long
> 	description. 

I like this one, but it's big and I'm going to have to take a good look at it.
I'm somewhat unhappy about the command line change, where you need to specify
a console or UML doesn't boot.  That'll break everyone's scripts.  Is it 
possible to provide a default console if there isn't one on the command line?

> What is the status of the amd64 port?  The 2.6.4 patch on sf.net
> produces lots of rejects when I try to apply it on top of the 2.6.7
> uml patch.  Is a newer version available somewhere?  Or can I just
> ignore all the rejects (guess not)? 

It's stuck on 2.6.4 for now.  I'm going to get it caught up, but haven't
decided when yet.

				Jeff



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Re: [uml-devel] Re: [ann] kraxel's 2.6.8 uml patch kit

[Geert Uytterhoeven]

On Fri, 20 Aug 2004, Jeff Dike wrote:
> kraxel@bytesex.org said:
> > uml-terminal-cleanup
> > 	tty / console handling cleanups.  The patchfile itself has a long
> > 	description.
>
> I like this one, but it's big and I'm going to have to take a good look at it.
> I'm somewhat unhappy about the command line change, where you need to specify
> a console or UML doesn't boot.  That'll break everyone's scripts.  Is it
> possible to provide a default console if there isn't one on the command line?

IIRC, the default console is the one that gets registered first. So by
reordering the code (in source files) and/or objects (in Makefiles) you can
make sure the correct one is the default.

BTW, what do you think of putting the stderr console in its own source file
with its own CONFIG_* option?

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds


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Re: [uml-devel] Re: [ann] kraxel's 2.6.8 uml patch kit

[Gerd Knorr]

On Fri, Aug 20, 2004 at 11:05:56PM +0200, Geert Uytterhoeven wrote:
> On Fri, 20 Aug 2004, Jeff Dike wrote:
> > I like this one, but it's big and I'm going to have to take a good look at it.
> > I'm somewhat unhappy about the command line change, where you need to specify
> > a console or UML doesn't boot.  That'll break everyone's scripts.  Is it
> > possible to provide a default console if there isn't one on the command line?
> 
> IIRC, the default console is the one that gets registered first.

Yes.

> So by reordering the code (in source files) and/or objects (in
> Makefiles) you can make sure the correct one is the default.

No.  The stderr console is registered _much_ earlier in the boot process
than the stdio console.  And I don't want to change that as having
printk work early is a cool debugging feature.  The stdio_console can't
be registered that early as it needs -- unlike stderr console -- several
kernel subsystems being initialized already.

> BTW, what do you think of putting the stderr console in its own source file
> with its own CONFIG_* option?

Thats IMHO a good idea in any case as one can turn on/off stderr console
and stdio console independant of each other.  That simplifies things for
both backward compatibility (make the kernel with stderr console
disabled behave like older versions should be easy, even without dirty
tricks like silently appending console=tty0) and fbcon (disable
stdio_console to get it out of the way but have stderr console for
printk-debugging it).

  Gerd

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Re: [uml-devel] Re: [ann] kraxel's 2.6.8 uml patch kit

[Werner Almesberger]

Gerd Knorr wrote:
> And I don't want to change that as having printk work early is a cool
> debugging feature.

Yeah ! I had a quick look at the code, and it seems that you
could still occasionally lose printk data in non-catastrophic
situations, e.g. when writing to a pipe. I've made a (less nice)
patch a while ago that doesn't loses data unless it really
really has to:

http://marc.theaimsgroup.com/?l=user-mode-linux-devel&m=108093851702249&w=2

BTW, do the console changes also remove the requirement that
stdin must be a tty, e.g. so that one could do
./linux </dev/null  and that UML doesn't alter terminal
settings ? (I've just worked around the latter problem in
umlsim, but it's rather messy.)

- Werner

-- 
  _________________________________________________________________________
 / Werner Almesberger, Buenos Aires, Argentina         wa@almesberger.net /
/_http://www.almesberger.net/____________________________________________/


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Re: [uml-devel] Re: [ann] kraxel's 2.6.8 uml patch kit

[Gerd Knorr]

> BTW, do the console changes also remove the requirement that
> stdin must be a tty, e.g. so that one could do
> ./linux </dev/null  and that UML doesn't alter terminal
> settings ? (I've just worked around the latter problem in
> umlsim, but it's rather messy.)

I think so, but havn't actually tried.  I usually use the host terminal
as serial console for the uml machine (i.e. "ssl0=fd:0,fd:1 console=ttyS0").

  Gerd

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[uml-devel] Re: [ann] kraxel's 2.6.8 uml patch kit

[Gerd Knorr]

On Fri, Aug 20, 2004 at 03:01:40PM -0400, Jeff Dike wrote:
> kraxel@bytesex.org said:
> > uml-core-on-panic
> > 	Make the uml kernel dump core on kernel panics for later analysis.
> > 	Default: off, there is a kernel cmd line arg to enable that. 
> 
> I like this, but I think it would be better done in a panic_notifier.

I'll have a look.

> > uml-fix-mconsole-proc
> > 	fix kernel crash triggered by running "uml_mconsole <umid> proc
> > <some-file>"
> > 	multipole times. 
> 
> I didn't do it this way on purpose.  I create an internal procfs mount in
> case the UML root user has mounted something else on /proc.  I don't want
> the mconsole on the host to be faked out by that.

I guessed that from reading the code already ;)

I'm happy with any other fix for the kernel crash as well.  I'm no VFS
expert through and don't know what exactly is wrong in the original
code.  I know that my version has the drawback that it depends on procfs
actually being mounted on /proc, but it's better that than being able to
kill the kernel by calling "uml_mconsole proc <file>" a few timers ;)

> > uml-terminal-cleanup
> 
> I like this one, but it's big and I'm going to have to take a good look at it.
> I'm somewhat unhappy about the command line change, where you need to specify
> a console or UML doesn't boot.  That'll break everyone's scripts.  Is it 
> possible to provide a default console if there isn't one on the command line?

See Geert's and my other mail.

  Gerd

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Re: [uml-devel] Re: [ann] kraxel's 2.6.8 uml patch kit

[D. Bahi]

[-- Attachment #1.1: Type: text/plain, Size: 445 bytes --]

Gerd Knorr wrote:

> On Fri, Aug 20, 2004 at 03:01:40PM -0400, Jeff Dike wrote:
> 
>>kraxel@bytesex.org said:
>>
>>>uml-core-on-panic
>>>	Make the uml kernel dump core on kernel panics for later analysis.
>>>	Default: off, there is a kernel cmd line arg to enable that. 
>>
>>I like this, but I think it would be better done in a panic_notifier.
> 
> 
> I'll have a look.
> 

I liked this too. Here's a pass at it if you like (attached).
-- 
db

[-- Attachment #1.2: core_on_panic.patch --]
[-- Type: text/x-diff, Size: 2464 bytes --]

diff -Naur linux.old/arch/um/kernel/reboot.c linux/arch/um/kernel/reboot.c
--- linux.old/arch/um/kernel/reboot.c	2004-08-30 16:38:37.000000000 -0400
+++ linux/arch/um/kernel/reboot.c	2004-08-30 16:38:51.000000000 -0400
@@ -38,21 +38,19 @@
 
 void uml_cleanup(void)
 {
-	kill_off_processes();
 	do_uml_exitcalls();
+	kill_off_processes();
 }
 
 void machine_restart(char * __unused)
 {
-	do_uml_exitcalls();
-	kill_off_processes();
+	uml_cleanup();
 	CHOOSE_MODE(reboot_tt(), reboot_skas());
 }
 
 void machine_power_off(void)
 {
-	do_uml_exitcalls();
-	kill_off_processes();
+	uml_cleanup();
 	CHOOSE_MODE(halt_tt(), halt_skas());
 }
 
@@ -69,5 +67,7 @@
  * ---------------------------------------------------------------------------
  * Local variables:
  * c-file-style: "linux"
+ * indent-tabs-mode: t
+ * tab-width: 8
  * End:
  */
diff -Naur linux.old/arch/um/kernel/um_arch.c linux/arch/um/kernel/um_arch.c
--- linux.old/arch/um/kernel/um_arch.c	2004-08-30 16:28:55.000000000 -0400
+++ linux/arch/um/kernel/um_arch.c	2004-08-30 18:20:53.000000000 -0400
@@ -412,9 +412,43 @@
 	.priority 		= 0
 };
 
+static int uml_coreonpanic = 0;
+
+static int coreonpanic_setup(char *str) {
+	printf("coreonpanic : Kernel will core on panic.\n");
+	uml_coreonpanic = 1;
+	return(0);
+}
+
+__setup("coreonpanic", coreonpanic_setup);
+__uml_help(coreonpanic_setup,
+"coreonpanic\n"
+"    This flag make it so that UML will dump core on a kernel panic or segfault.\n"
+"    Shell environment restrictions on cores (limit or ulimit) still apply.\n\n"
+"    Beware that your UML will not reboot with this flag.\n"
+);
+
+static int panic_coreonpanic(struct notifier_block *self, unsigned long unused1,
+			     void *unused2)
+{
+	if(uml_coreonpanic){
+		uml_cleanup();
+		block_signals();
+		abort();
+	}
+	return(0);		/* never get here */
+}
+
+static struct notifier_block panic_coreonpanic_notifier = {
+	.notifier_call 		= panic_coreonpanic,
+	.next 			= NULL,
+	.priority 		= 1
+};
+
 void __init setup_arch(char **cmdline_p)
 {
 	notifier_chain_register(&panic_notifier_list, &panic_exit_notifier);
+	notifier_chain_register(&panic_notifier_list, &panic_coreonpanic_notifier);
 	paging_init();
  	strcpy(command_line, saved_command_line);
  	*cmdline_p = command_line;
@@ -436,5 +470,7 @@
  * ---------------------------------------------------------------------------
  * Local variables:
  * c-file-style: "linux"
+ * indent-tabs-mode: t
+ * tab-width: 8
  * End:
  */

[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 187 bytes --]

Re: [uml-devel] Re: [ann] kraxel's 2.6.8 uml patch kit

[Gerd Knorr]

> I liked this too. Here's a pass at it if you like (attached).

Sorry for the delay, going over this while being busy updating my
patches right now ...

> +static int panic_coreonpanic(struct notifier_block *self, unsigned long unused1,
> +			     void *unused2)
> +{
> +	if(uml_coreonpanic){
> +		uml_cleanup();
> +		block_signals();
> +		abort();

What is the point of doing that?  I'd just let it dump core without any
cleanups, to get the state of the uml kernel dumped to the disk with few
modifications as possible.  Any changes might make the analysis of the
crash harder or even impossible.

  Gerd

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Re: [uml-devel] Re: [ann] kraxel's 2.6.8 uml patch kit

[D. Bahi]

[-- Attachment #1: Type: text/plain, Size: 1239 bytes --]

actually it's worse than that in my current implementation:

static int panic_coreonpanic(struct notifier_block *self, unsigned long 
unused1,
                 void *unused2)
{
    if ( uml_coreonpanic ) {
        /* cleanup so we have less to cleanup [linux] on the host */
        /* could panic in uml_cleanup though so we need a check */
        if ( uml_exitcode++ < 1 ) {
            uml_cleanup();
        }
        /* to prevent keyboard from causing terminal to spew during dump */
        block_signals();
        abort();
    }
    return(0);
}


Gerd Knorr wrote:

>>I liked this too. Here's a pass at it if you like (attached).
>>    
>>
>
>Sorry for the delay, going over this while being busy updating my
>patches right now ...
>
>  
>
>>+static int panic_coreonpanic(struct notifier_block *self, unsigned long unused1,
>>+			     void *unused2)
>>+{
>>+	if(uml_coreonpanic){
>>+		uml_cleanup();
>>+		block_signals();
>>+		abort();
>>    
>>
>
>What is the point of doing that?  I'd just let it dump core without any
>cleanups, to get the state of the uml kernel dumped to the disk with few
>modifications as possible.  Any changes might make the analysis of the
>crash harder or even impossible.
>
>  Gerd
>
>  
>

-- 
db


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 187 bytes --]

[uml-devel] [patch] core-on-panic next take ;)

[Gerd Knorr]

On Wed, Sep 15, 2004 at 04:59:16PM -0400, D. Bahi wrote:
> actually it's worse than that in my current implementation:

Thanks for the comments, merged that into my current version.  Attached
below.

I've also moved it all into a single source file, so it is nicely
separated and also can be trivialy made a compile time option if
someone wants this.

  Gerd

Index: uml-2.6.9-rc2/arch/um/kernel/Makefile
===================================================================
--- uml-2.6.9-rc2.orig/arch/um/kernel/Makefile	2004-09-15 08:36:20.000000000 +0200
+++ uml-2.6.9-rc2/arch/um/kernel/Makefile	2004-09-15 08:36:20.000000000 +0200
@@ -11,7 +11,7 @@ obj-y = checksum.o config.o exec_kern.o 
 	sigio_user.o sigio_kern.o signal_kern.o signal_user.o smp.o \
 	syscall_kern.o syscall_user.o sysrq.o sys_call_table.o tempfile.o \
 	time.o time_kern.o tlb.o trap_kern.o trap_user.o uaccess_user.o \
-	um_arch.o umid.o user_util.o
+	um_arch.o umid.o user_util.o core-on-panic.o
 
 obj-$(CONFIG_BLK_DEV_INITRD) += initrd_kern.o initrd_user.o
 obj-$(CONFIG_GPROF)	+= gprof_syms.o
Index: uml-2.6.9-rc2/arch/um/kernel/core-on-panic.c
===================================================================
--- uml-2.6.9-rc2.orig/arch/um/kernel/core-on-panic.c	2004-04-06 15:27:52.000000000 +0200
+++ uml-2.6.9-rc2/arch/um/kernel/core-on-panic.c	2004-09-16 12:19:08.303422237 +0200
@@ -0,0 +1,63 @@
+/*
+ * allow user mode linux kernels dump core on kernel panics,
+ * for later analysis of the crash.
+ *
+ * (c) 2004 Gerd Knorr + D. Bahi
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/notifier.h>
+
+#include "init.h"
+#include "os.h"
+
+static int core_on_panic_func(struct notifier_block *self, unsigned long unused1,
+		              void *unused2)
+{
+	static int recurse = 0;
+
+        /* cleanup so we have less to cleanup [linux] on the host */
+	/* could panic in uml_cleanup though so we need a check */
+        if (0 == recurse++)
+		uml_cleanup();
+
+	/* to prevent keyboard from causing terminal to spew during dump */
+	block_signals();
+
+	/* actually dump ... */
+	abort();
+
+	/* not reached */
+	return 0;
+}
+
+static struct notifier_block core_on_panic_notifier = {
+	.notifier_call 		= core_on_panic_func,
+	.priority 		= 1,
+};
+
+static int core_on_panic = 0;
+
+static int __init core_on_panic_setup(char *str)
+{
+	core_on_panic = 1;
+	return 0;
+}
+
+static int __init core_on_panic_init(void)
+{
+	if (core_on_panic)
+		notifier_chain_register(&panic_notifier_list, &core_on_panic_notifier);
+	return 0;
+}
+
+__initcall(core_on_panic_init);
+__setup("coreonpanic", core_on_panic_setup);
+__uml_help(core_on_panic_setup,
+	"coreonpanic\n"
+	"    This flag make it so that UML will dump core on a kernel panic or segfault.\n"
+	"    Shell environment restrictions on cores (limit or ulimit) still apply.\n"
+	"\n"
+	"    Beware that your UML will not reboot with this flag.\n"
+);
+


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