[uml-devel] Problem with 2.4.22-uml6 & skas...

[uml-devel] Problem with 2.4.22-uml6 & skas...

[Sven 'Darkman' Michels]

Hi there,

i try to get 2.4.22-6 running with skas mode.

The host:
Running vanilla 2.4.22 with host-skas3.patch (applied without
any error), PROC_MM enabled.
GCC is 3.3.1
The box is running fine with the kernel.

The UML:
2.4.22 patched with uml6, skas enabled etc.pp.

Problem:
i start the uml with:
linux-2.4.22 ubd0=/home/uml1/uml/10/root_fs 
ubd1=/home/uml1/uml/10/swap.disk mem=64M con1=pts umid=uml10 
eth0=tuntap,uml10-eth0 devfs=mount
and it stops here:
VFS: Mounted root (ext2 filesystem) readonly.
Mounted devfs on /dev

if i take a look at the host, i can see the following:
uml1     12180  0.0  0.0     4    0 pts/4    TW   03:41   0:00 
[linux-2.4.22-te]
uml1     12185  0.0  0.9 65956 4640 pts/4    S    03:41   0:00 
/home/uml1/uml/linux-2.4.22-test 

uml1     12186  0.0  0.9 65956 4640 pts/4    S    03:41   0:00 
/home/uml1/uml/linux-2.4.22-test 

uml1     12164 99.7  0.9 65956 4640 pts/4    R    03:41   4:13 
/home/uml1/uml/linux-2.4.22-test

(one uml running with nearly 100% cpu usage..)
attached strace on that one, i get:


--- SIGSEGV (Segmentation fault) @ 0 (0) ---
rt_sigprocmask(SIG_UNBLOCK, [USR1], [], 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [ALRM VTALRM PROF IO], NULL, 8) = 0
getpid()                                = 12164
write(12, "7\0\0\0\0`\1@\0\20\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
28) = 28
write(12, "6\0\0\0\0`\1@\0\20\0\0\7\0\0\0\21\0\0\0\3\0\0\0\0P\\\0"..., 
28) = 28
sigreturn()                             = ? (mask now [])
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
rt_sigprocmask(SIG_UNBLOCK, [USR1], [], 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [ALRM VTALRM PROF IO], NULL, 8) = 0
getpid()                                = 12164
write(12, "7\0\0\0\0`\1@\0\20\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
28) = 28
write(12, "6\0\0\0\0`\1@\0\20\0\0\7\0\0\0\21\0\0\0\3\0\0\0\0P\\\0"..., 
28) = 28
sigreturn()                             = ? (mask now [])
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
and so on...

with mode=tt the kernel runs. Then i tried another kernel from
kernels.usermodelinux.org:
linux-2.4.23-rc3-djc3-6um (nomods)
and: it works.
I talked to david and he said the kernel builds without problems
which is not the case on my host. I get this error:
bugs.c: In function `disable_lcall':
bugs.c:111: error: storage size of `ldt' isn't known
bugs.c:118: warning: implicit declaration of function `modify_ldt'
bugs.c:111: warning: unused variable `ldt'

which is fixed with a patch from:
http://people.0x63.nu/~andersg/uml-minor-fixes.diff

so, for now, i don't have more ideas to solve this Problem. If someone
of you has an idea or fix, please commit ;)

Thanks and regards,
Sven



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Re: [uml-devel] Problem with 2.4.22-uml6 & skas...

[Jeff Dike]

sven@darkman.de said:
> The host: Running vanilla 2.4.22 with host-skas3.patch (applied
> without any error), PROC_MM enabled. 

>  Problem: i start the uml with: linux-2.4.22 ubd0=/home/uml1/uml/10/
> root_fs  ubd1=/home/uml1/uml/10/swap.disk mem=64M con1=pts umid=uml10
> eth0=tuntap,uml10-eth0 devfs=mount and it stops here: VFS: Mounted
> root (ext2 filesystem) readonly. Mounted devfs on /dev 

Every case of this I've seen has been caused by David's 2.4.21 (or so) skas
patch being applied to 2.4.22.  Applying my 2.4.19 skas patch has fixed
the problem.

				Jeff



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