Problem with 2.4.22-uml6 & skas...

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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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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