[uml-devel] Problem with 2.4.22-um4

[Patrick Kilian <petschge@gmx.de>]

Hi,

I got a problem with 2.4.22-um4 that I can't track down. I'm using a 
clean 2.4.22 kernel from kernel.org patched with the um4 patch from 
user-mode-linux.sourceforge.net. I ran make xconfig ARCH=um and enabled 
support for "Anonymous memory device". Than I ran make linux ARCH=um 
but when I start the binary I get:

host$ ./linux-2.4.22  ubd0=cow_3,./root_fs/own2 
eth0=tuntap,,,192.168.0.100 root=/dev/ubd0
Checking for the skas3 patch in the host...not found
Checking for /proc/mm...not found
tracing thread pid = 12078
Linux version 2.4.22-4um (root@mars) (gcc version 2.95.3 20010315 
(SuSE)) #2 Mit Sep 17 12:41:29 CEST 2003
On node 0 totalpages: 8192
zone(0): 8192 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line: ubd0=cow_3,./root_fs/own2 
eth0=tuntap,,,192.168.0.100 root=/dev/ubd0
Calibrating delay loop... 756.76 BogoMIPS
Memory: 28728k available
Dentry cache hash table entries: 4096 (order: 3, 32768 bytes)
Inode cache hash table entries: 2048 (order: 2, 16384 bytes)
Mount cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer cache hash table entries: 1024 (order: 0, 4096 bytes)
Page-cache hash table entries: 8192 (order: 3, 32768 bytes)
Checking for host processor cmov support...Yes
Checking for host processor xmm support...No
Checking that ptrace can change system call numbers...OK
Checking that host ptys support output SIGIO...<0>Kernel panic: 
check_sigio : read failed, err = -1

In idle task - not syncing

The host kernel is a 2.4.18 kernel patched by SuSE _without_ skas 
support. gcc version is 2.95.3.

Is this a know bug? Is 2.4.22-um4 unusable without skas? Is this related 
to the patch in arch/um/drivers/ubd_user.c? (Neither the patch from 
Ross Combs nor the patch named ubd_start_io_thread.diff from Steve 
Schmidtke fix this error)

mfg,
Patrick "Petschge" Kilian

-- 
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