[uml-devel] Re: Problems applying patches to 2.6.12-rc5-mm1

[uml-devel] Re: Problems applying patches to 2.6.12-rc5-mm1

[antoine]

Note: this is an attempt at running it on x86_64 host, so the errors
may or may not be the same...

I applied the patches on the website to 2.6.12-rc5 (mm1 and mm2: most
patches apply cleanly to both, some have been merged in mm2 obviously),
I got an error here:

gcc   -Wall -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing
-fno-common -ffreestanding -O2 -fno-omit-frame-pointer
-fno-optimize-sibling-calls -g -U__x86_64__ -fno-builtin -D__arch_um__
-DSUBARCH=\"x86_64\" -Iarch/um/include
-I/usr/src/linux-2.6.12-rc5-mm2-uml/arch/um/kernel/tt/include
-D__x86_64__ -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -c -o
arch/um/sys-x86_64/stub_segv.o arch/um/sys-x86_64/stub_segv.c
In file included from /usr/include/asm/ucontext.h:2,
                 from arch/um/sys-x86_64/stub_segv.c:8:
/usr/include/asm/../asm-x86_64/ucontext.h:4: error: redefinition of
`struct ucontext'

I removed the #include "ucontext", and added #include "uml-config.h" to
stub_segv.c. Then it got stuck on:
fixdep: arch/um/sys-x86_64/.stub_segv.o.d: No such file or directory
Re-running the build as suggested by Jeff did not help, but
creating an empty file to make it proceed seems to work...
`touch arch/um/sys-x86_64/.stub_segv.o.d`
(I haven't tried removing the av-skas patch yet)

Then it builds and almost runs:
(...)
[42949373.260000] kjournald starting.  Commit interval 5 seconds
[42949373.260000] EXT3-fs: mounted filesystem with ordered data mode.
[42949373.260000] VFS: Mounted root (ext3 filesystem) readonly.
[42949373.260000] Kernel panic - not syncing: Kernel mode fault at addr
0x0, ip 0x0
[42949373.260000]
[42949373.260000] Pid: 1, comm: bash Not tainted 2.6.12-rc5-mm2
[42949373.260000] RIP: 0000:[<0000000000000000>]
[42949373.260000] RSP: 0000000060453c30  EFLAGS: 00010202
[42949373.260000] RAX: 0000000000000001 RBX: 0000000000000000 RCX:
0000000060194ec1
[42949373.260000] RDX: 000000006002840d RSI: 0000000000000001 RDI:
0000000060453ad0
[42949373.260000] RBP: 0000000000000000 R08: 0000000000000000 R09:
0000000000000000
[42949373.260000] R10: 0000000000000008 R11: 0000000000000246 R12:
0000000000000000
[42949373.260000] R13: 0000000000000001 R14: 000000000000000a R15:
0000000000000000
[42949373.260000] Call Trace:
[42949373.260000] 604536d8:  [<6001575f>] panic_exit+0x2f/0x50
[42949373.260000] 604536f8:  [<60040c2b>] notifier_call_chain+0x2b/0x50
[42949373.260000] 60453728:  [<6002fe24>] panic+0xe4/0x180
[42949373.260000] 60453768:  [<60194ec1>] __sigprocmask+0x11/0x40
[42949373.260000] 60453788:  [<6010e0b3>] __up_read+0xb3/0xf0
[42949373.260000] 604537a8:  [<60014908>] handle_page_fault+0xc8/0x280
[42949373.260000] 604537d8:  [<6002a1ef>] __do_user_copy+0x4f/0xd0
[42949373.260000] 60453818:  [<60014caa>] segv+0x1ea/0x2b0
[42949373.260000] 60453828:  [<60194f85>] sigemptyset+0x15/0x40
[42949373.260000] 60453838:  [<60028d71>] change_sig+0x61/0x80
[42949373.260000] 604538a8:  [<60194f85>] sigemptyset+0x15/0x40
[42949373.260000] 604538b8:  [<60028de1>] change_signals+0x51/0x80
[42949373.260000] 60453928:  [<60015056>] segv_handler+0x106/0x120
[42949373.260000] 60453958:  [<60014f50>] segv_handler+0x0/0x120
[42949373.260000] 60453968:  [<60017fc9>] sig_handler_common_tt
+0x119/0x1b0
[42949373.260000] 604539d8:  [<60028a80>] sig_handler+0x10/0x20
[42949373.260000] 604539e8:  [<60194c40>] __restore_rt+0x0/0x10
[42949373.260000] 60453a78:  [<6002840d>] run_kernel_thread+0x2d/0x50
[42949373.260000] 60453a88:  [<60194ec1>] __sigprocmask+0x11/0x40
[42949373.260000] 60453ae0:  [<6000f1b0>] init+0x0/0x100
[42949373.260000] 60453b08:  [<6002840d>] run_kernel_thread+0x2d/0x50
[42949373.260000] 60453b88:  [<6000f1b0>] init+0x0/0x100
[42949373.260000] 60453b98:  [<60028e2e>] unblock_signals+0xe/0x10
[42949373.260000] 60453ba8:  [<60016456>] new_thread_handler+0x166/0x1a0
[42949373.260000] 60453cd8:  [<60194ec1>] __sigprocmask+0x11/0x40
[42949373.260000]
[42949373.260000]

Now, I am really stuck.
Any ideas?

Cheers
Antoine


On Sat, 2005-05-28 at 20:07 +0100, antoine wrote:
> Hi Jeff,
> 
> Now that the ptrace host bug has been fixed in 2.6.11.11, I can run
> tests on shared systems without taking too many risks, but I am a little
> bit lost as to which patches I would need to apply, between your
> patches, Blaisorblade's, al's,.. Which all seem to contain x86_64
> patches. Let me know what I can do to help testing. I am sure I can find
> some new bugs, in fact I am working on a Java VM bug atm.
> 
> Cheers
> Antoine
> 
> 
> On Mon, 2005-05-09 at 01:57 +0100, Antoine Martin wrote:
> > Crashing it is quite easy in fact, reiserfs as root_fs just won't work.
> > I don't think this trace is going to help, but here it is anyway:
> > 
> > [42949381.990000] REISERFS: panic (device Null superblock):
> > reiserfs[175]: assertion !( comp_keys( &MAX_KEY, p_s_key ) && !
> > key_in_buffer(p_s_search_path, p_s_key, p_s_sb) ) failed at
> > fs/reiserfs/stree.c:685:search_by_key: PAP-5130: key is not in the
> > buffer
> > [42949381.990000] Kernel panic - not syncing: BUG!
> > [42949381.990000]  [42949381.990000]
> > 
> > 
> > On Sun, 2005-05-08 at 23:20 +0100, Antoine Martin wrote:
> > > All good, builds fine and hasn't crashed yet!
> > > I'll get back to you with (hopefully) more useful debugging information
> > > as soon as Andi Kleen comes up with a patch for the host bug.
> > > 
> > > Antoine
> > > 
> > > On Sun, 2005-05-08 at 14:35 -0400, Jeff Dike wrote:
> > > > I uploaded a new set of patches which patches, builds, and runs on both
> > > > i386 and x86_64.
> > > > 
> > > > On Sun, May 08, 2005 at 06:37:19PM +0100, Antoine Martin wrote:
> > > > > I noticed that you updated the website with patches against -rc4 so I
> > > > > built the beast, As before, I had to do this to fix it:
> > > > > cd include/asm
> > > > > ln -sf elf-x86_64.h elf.h
> > > > 
> > > > I get an empty elf.h which obviously causes build problems.  Removing it
> > > > and rebuilding fixes it.  I haven't looked at this yet.
> > > > 
> > > > > I also had a reject on:
> > > > > arch/um/sys-x86_64/Makefile
> > > > 
> > > > This should be OK now.
> > > > 
> > > > 				Jeff



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[uml-devel] Re: 2.6.11.8 + UML/x86_64 (2.6.12-rc3+) = oops

[Jeff Dike]

On Thu, Jun 02, 2005 at 06:51:22AM +0100, antoine wrote:
> I applied the patches on the website to 2.6.12-rc5 (mm1 and mm2: most
> patches apply cleanly to both, some have been merged in mm2 obviously),
> I got an error here:

I pushed out a fixed set of patches (against -mm2) that work for me.

There were some include changes in stub_segv.c.

The .d file thing is still there.  That seems to have been caused by my 
changing stub_segv.c to a userspace file.

				Jeff


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[uml-devel] Re: 2.6.11.8 + UML/x86_64 (2.6.12-rc3+) = oops

[antoine]

Thanks, almost all applied cleanly - I skipped the s390 ones for now.
Compiling still requires a `touch arch/um/sys-x86_64/.stub_segv.o.d` to
make it proceed. Works for me! (tm)
But I can't get it to boot into init properly, I can only boot with
init=/bin/bash. (then remount root rw, mount proc)

Every time I run a command, I get something like:
bash: child setpgid (15484 to 15484): No such process
(I remember seeing this one before - but I can't remember the
solution :-(

I can bring the network up manually (ifconfig) and ping (in and out),
but running any of the /etc/init.d/ scripts locks up, same goes for
starting sshd or even "Hello World" in hello.sh

Sometimes when it goes into a spin, it loos on this (to infinity):
"[42949450.500000] fix_range_common: failed, killing current process"

Not sure where do go from here... Maybe patching with just the minimum?
It needs roughly at least up to fix-tt-USR1-handlers to be able to boot
(otherwise you get the error I posted yesterday).

Antoine




On Thu, 2005-06-02 at 17:06 -0400, Jeff Dike wrote:
> On Thu, Jun 02, 2005 at 06:51:22AM +0100, antoine wrote:
> > I applied the patches on the website to 2.6.12-rc5 (mm1 and mm2: most
> > patches apply cleanly to both, some have been merged in mm2 obviously),
> > I got an error here:
> 
> I pushed out a fixed set of patches (against -mm2) that work for me.
> 
> There were some include changes in stub_segv.c.
> 
> The .d file thing is still there.  That seems to have been caused by my 
> changing stub_segv.c to a userspace file.
> 
> 				Jeff



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Re: [uml-devel] Re: 2.6.11.8 + UML/x86_64 (2.6.12-rc3+) = oops

[Jeff Dike]

On Fri, Jun 03, 2005 at 03:33:36AM +0100, antoine wrote:
> Thanks, almost all applied cleanly - I skipped the s390 ones for now.

I wouldn't cherry-pick patches.  You may be right, but it also means you're
running different code than me.

> I can bring the network up manually (ifconfig) and ping (in and out),
> but running any of the /etc/init.d/ scripts locks up, same goes for
> starting sshd or even "Hello World" in hello.sh

Dunno, it works here, and I've beat on it a bunch.  If you can get stack
traces or anything from the hangs, that might help.

				Jeff


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Re: [uml-devel] Re: 2.6.11.8 + UML/x86_64 (2.6.12-rc3+) = oops

[Jeff Dike]

On Fri, Jun 03, 2005 at 08:28:10PM +0100, antoine wrote:
> I think there is still a memory leak lurking, OOM seems to kick in (see
> bottom of this email)

Yeah, it's a page leak, I think from page tables, which I haven't tracked
down yet.

> Very minor thing: I noticed that the TT threads generally do not show
> which process they are running inside the UML (as it used to), any way
> to restore this?

Those aren't tt threads, they are skas0 threads, and we could probably restore 
the command names, but I haven't bothered doing so.

				Jeff


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Re: [uml-devel] Re: 2.6.11.8 + UML/x86_64 (2.6.12-rc3+) = oops

[Bodo Stroesser]

Jeff Dike wrote:
> On Fri, Jun 03, 2005 at 08:28:10PM +0100, antoine wrote:
> 
>>I think there is still a memory leak lurking, OOM seems to kick in (see
>>bottom of this email)
> 
> 
> Yeah, it's a page leak, I think from page tables, which I haven't tracked
> down yet.
> 
> 
>>Very minor thing: I noticed that the TT threads generally do not show
>>which process they are running inside the UML (as it used to), any way
>>to restore this?
> 
> 
> Those aren't tt threads, they are skas0 threads, and we could probably restore 
> the command names, but I haven't bothered doing so.
I thought about doing so, as the output of ps really looks bad.
Unfortunately, I found only very nasty ways.
On older host's, we could try to expand or strip down the environment in a similar
way as is used it tt. Then, names could be placed into stub-(stack?)-page.
Nasty, but it could work.
An even worse case is a host using stack-randomization. We need a pointer in the
host poining to stub-pages. If the host has left a "hole" above the stack, would
we have to "exec" until accidentally we get a stack starting at upper address-range
limit?
		Bodo
> 
> 				Jeff
> 
> 
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Re: [uml-devel] Re: 2.6.11.8 + UML/x86_64 (2.6.12-rc3+) = oops

[antoine]

On Thu, 2005-06-02 at 22:38 -0400, Jeff Dike wrote:
> On Fri, Jun 03, 2005 at 03:33:36AM +0100, antoine wrote:
> > Thanks, almost all applied cleanly - I skipped the s390 ones for now.
> 
> I wouldn't cherry-pick patches.  You may be right, but it also means you're
> running different code than me.
I wouldn't normally do that, but there is a patch that does not apply
cleanly: fp-state (can't find file to patch at input line 28 ...)
So I started thinking that there were things I did not necessarily need
or want (s390, x11fb, audio, etc) - I guess I was wrong...

I started again, applying everything else, some files complained about
missing skas.h or proc_mm.h, another case of empty file, easy fix:
rm ./arch/um/kernel/skas/include/skas.h

I got tired of doing the same steps over and over again (to be sure I
wasn't reporting my own mistakes) so I made this very simple script to
untar kernel source + apply MM + apply UML patches:
http://213.228.237.37/uml/2.6.12-rc5-mm2/make-uml64.sh
I've also dumped the compile errors, kernel binary, .config in the same
directory.

Everything kinda works now! And it is *very* fast (compared to TT x86
guest) And this time it is a bit more stable.
I think there is still a memory leak lurking, OOM seems to kick in (see
bottom of this email)

Very minor thing: I noticed that the TT threads generally do not show
which process they are running inside the UML (as it used to), any way
to restore this?

Thanks
Antoine


> 
> > I can bring the network up manually (ifconfig) and ping (in and out),
> > but running any of the /etc/init.d/ scripts locks up, same goes for
> > starting sshd or even "Hello World" in hello.sh
> 
> Dunno, it works here, and I've beat on it a bunch.  If you can get stack
> traces or anything from the hangs, that might help.
> 
> 				Jeff
*********
* OOM
* 128RAM + 128swap should be enough to emerge things...
*********

[42951416.180000] oom-killer: gfp_mask=0xd2
[42951416.180000] DMA per-cpu:
[42951416.180000] cpu 0 hot: low 30, high 90, batch 15
[42951416.180000] cpu 0 cold: low 0, high 30, batch 15
[42951416.180000] Normal per-cpu: empty
[42951416.180000] HighMem per-cpu: empty
[42951416.180000]
[42951416.180000] Free pages:        1432kB (0kB HighMem)
[42951416.180000] Active:166 inactive:333 dirty:0 writeback:0 unstable:0
free:358 slab:999 mapped:82 pagetables:9547
[42951416.180000] DMA free:1432kB min:1448kB low:1808kB high:2172kB
active:664kB inactive:1332kB present:131072kB pages_scanned:1301
[42951416.180000] lowmem_reserve[]: 0 0 0
[42951416.180000] Normal free:0kB min:0kB low:0kB high:0kB active:0kB
inactive:0kB present:0kB pages_scanned:0
[42951416.180000] lowmem_reserve[]: 0 0 0
[42951416.180000] HighMem free:0kB min:128kB low:160kB high:192kB
active:0kB inactive:0kB present:0kB pages_scanned:0
[42951416.180000] lowmem_reserve[]: 0 0 0
[42951416.180000] DMA: 0*4kB 5*8kB 1*16kB 1*32kB 1*64kB 0*128kB 1*256kB
0*512kB 1*1024kB 0*2048kB 0*4096kB = 1432kB
[42951416.180000] Normal: empty
[42951416.180000] HighMem: empty
[42951416.180000] Swap cache: add 314384, delete 314009, find
48066/104534, race 0+0
[42951416.180000] Free swap  = 112048kB
[42951416.180000] Total swap = 131064kB
[42951416.180000] Out of Memory: Killed process 978 (emerge).
[42951416.180000] oom-killer: gfp_mask=0xd2
[42951416.180000] DMA per-cpu:
[42951416.180000] cpu 0 hot: low 30, high 90, batch 15
[42951416.180000] cpu 0 cold: low 0, high 30, batch 15
[42951416.180000] Normal per-cpu: empty
[42951416.180000] HighMem per-cpu: empty
[42951416.180000]
[42951416.180000] Free pages:        1432kB (0kB HighMem)
[42951416.180000] Active:166 inactive:333 dirty:0 writeback:0 unstable:0
free:358 slab:1000 mapped:82 pagetables:9519
[42951416.180000] DMA free:1432kB min:1448kB low:1808kB high:2172kB
active:664kB inactive:1332kB present:131072kB pages_scanned:1301
[42951416.180000] lowmem_reserve[]: 0 0 0
[42951416.180000] Normal free:0kB min:0kB low:0kB high:0kB active:0kB
inactive:0kB present:0kB pages_scanned:0
[42951416.180000] lowmem_reserve[]: 0 0 0
[42951416.180000] HighMem free:0kB min:128kB low:160kB high:192kB
active:0kB inactive:0kB present:0kB pages_scanned:0
[42951416.180000] lowmem_reserve[]: 0 0 0
[42951416.180000] DMA: 0*4kB 5*8kB 1*16kB 1*32kB 1*64kB 0*128kB 1*256kB
0*512kB 1*1024kB 0*2048kB 0*4096kB = 1432kB
[42951416.180000] Normal: empty
[42951416.180000] HighMem: empty
[42951416.180000] Swap cache: add 314384, delete 314009, find
48066/104535, race 0+0
[42951416.180000] Free swap  = 123236kB
[42951416.180000] Total swap = 131064kB
[42951416.180000] Out of Memory: Killed process 5713 (portageq).




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