Re: [uml-devel] [Bug 49277] Compile of usermode-sources-2.6.x fails

[Nix <nix@esperi.org.uk>]

On Tue, 7 Jun 2005, blaisorblade@yahoo.it suggested tentatively:
> On Tuesday 07 June 2005 18:21, Nix wrote:
>> OK, so it's a -static TT build that's failing?
> Exactly.

Built, with a randomly selected .config (that is, a .config I use for
other things, not a .config with the values set at random!)

Not quite built without problems. Can you guess the cause of this?

        gcc -static -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc -o .tmp_vmlinux1 -Wl,-T,arch/um/kernel/vmlinux.lds   init/built-in.o -Wl,--staart-group  usr/built-in.o  arch/um/kernel/built-in.o  arch/um/drivers/built-in.o  arch/um/os-Linux/built-in.o  arch/um/sys-i386/built-in.o  arch/i386/crypto/built-in.o  kernel/built-in.o  mm/built-in.o  fs/built-in.o  ipc/built-in.o  security/built-in.o  crypto/built-in.o  lib/lib.a  lib/built-in.o  drivers/built-in.o  sound/built-in.o  net/built-in.o -Wl,--end-group -lutil  ; rm -f linux
/usr/bin/ld: cannot find -lutil

Guess where the static libutil.a is. That's right, /usr/lib. Are
we searching it in that linker script? No :(

diff -durN linux-2.6.11.10-bs6-orig/arch/um/kernel/uml.lds.S linux-2.6.11.10-bs6/arch/um/kernel/uml.lds.S
--- linux-2.6.11.10-bs6-orig/arch/um/kernel/uml.lds.S	2005-06-07 20:23:58.000000000 +0100
+++ linux-2.6.11.10-bs6/arch/um/kernel/uml.lds.S	2005-06-07 20:41:45.000000000 +0100
@@ -4,6 +4,7 @@
 OUTPUT_ARCH(ELF_ARCH)
 ENTRY(_start)
 jiffies = jiffies_64;
+SEARCH_DIR("/usr/lib"); SEARCH_DIR("/lib");
 
 SECTIONS
 {

With that applied, it builds...

... and segfaults almost at once on invocation:

execve("./vmlinux", ["./vmlinux"], [/* 49 vars */]) = 0
uname({sys="Linux", node="hades", ...}) = 0
brk(0)                                  = 0xa0343000
brk(0xa0343834)                         = 0xa0343834
set_thread_area({entry_number:-1 -> 6, base_addr:0xa034381c, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++

#0  0xa01a16a7 in ptmalloc_init ()
#1  0x00000000 in ?? ()
#2  0x00000000 in ?? ()
#3  0x00000000 in ?? ()
#4  0x00000000 in ?? ()
#5  0x00000000 in ?? ()
#6  0x00000000 in ?? ()
#7  0x00000000 in ?? ()
#8  0x00000000 in ?? ()
#9  0x00000000 in ?? ()
#10 0x00000000 in ?? ()
#11 0x00000000 in ?? ()
#12 0xbffff2b2 in ?? ()
#13 0xa0343000 in ?? ()
#14 0x0000000c in ?? ()
#15 0xbffff444 in ?? ()
#16 0x0000000c in ?? ()
#17 0xbffff1a0 in ?? ()
#18 0xa01a19a7 in malloc_hook_ini ()
#19 0xa0213f3f in xdigits.0 ()
#20 0xa01a0e4a in malloc ()
#21 0x0000000c in ?? ()
#22 0xa01ccb7c in _dl_init_paths ()
#23 0xa01aa42c in _dl_non_dynamic_init ()
#24 0x000fffff in ?? ()
#25 0xbffff44c in ?? ()
#26 0xbffff444 in ?? ()
#27 0x00000001 in ?? ()
#28 0xbffff2b2 in ?? ()
#29 0xa01aa76b in init ()
#30 0x0000037f in ?? ()
#31 0x00000003 in ?? ()
#32 0xbffff2b2 in ?? ()
#33 0xa018dbc7 in __pthread_initialize_minimal ()
#34 0x00000000 in ?? ()
#35 0x0002060b in ?? ()
#36 0x00000003 in ?? ()
#37 0xa018d6bd in __libc_start_main ()
#38 0x00000000 in ?? ()

Looks like a thread initialization problem to *me*. And there be very
serious and nasty snarling dragons with sharp pointy carborundum teeth
:(

(this box, btw, is an AMD Athlon 4: it *does* have CMOV support. Not
that that could plausibly be the problem here.)

>> Patch mis-rolled, I guess: arch/um/scripts/Makefile.rules is missing,
>> yet included from multiple places:
> Not only that, dear boy, not only that... I now looked 
> 
> combinediff: hunk-splitting is required in this case, but is not yet implemented
> combinediff: use the -U option to work around this

Whoops!

I guess not many people have tried to build -bs6, then: I doubt that would work
terribly well in skas mode, either ;)

> Seems like I'll have to resort to something bad... which is attached, i.e. 
> black magic (using -U from time to time).

Black magic during debugging makes me nervous, so...

> Alternatively, use patch1.bz2 and patch2.bz2, which have normal context (the 
> final patch has been generated by merging them).

... I used these, which applied fine.

>> [fixed one bug in a local administrative script at 04:00 this morning...
>>  insomnia sucks, hay fever sucks, temperatures above 15C suck...]
> I share with you insomnia and hay fever (if I do the right guess). For 

`Seasonal allergic rhinitis', i.e., plants trying to have sex with my
nose over my violent protests.

> temperatures above 15C, I don't: I live in Sicily, so here we're at about 

I guessed that. Merely .it is a preetty big clue. Myself, I've carefully
steered clear of southern Europe and points south in the summer. April
Rome temperatures are about the most I'm comfortable with.

> 25°-30° C, and it'll go up to 40°C...

Well, it's done that in the south-east of England, too, but I don't have
to like it, and it's `exceptional' (i.e. `has happened almost every year
for the last decade' :( )

-- 
`It's as bizarre an intrusion as, I don't know, the hobbits coming home
 to find that the Shire has been taken over by gangsta rappers.'


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