[uml-devel] Problem with 2.4.22-um4

[uml-devel] Problem with 2.4.22-um4

[Patrick Kilian]

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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Re: [uml-devel] Problem with 2.4.22-um4

[Steve Schmidtke]

petschge@gmx.de wrote:

>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?

Jeff didn't like a part of my patch, but didn't back out all of the related 
bits.  I've sent him a patch that should fix this issue, but havn't heard 
back if he likes it any better.

In the mean time you can hand apply this diff to 
arch/um/kernel/sigio_user.c:tty_output()

-       else if(n == -EAGAIN) printk("No, enabling workaround\n");
-       else panic("check_sigio : read failed, err = %d\n", n);
+       else if(errno == EAGAIN) printk("No, enabling workaround\n");
+       else panic("check_sigio : read failed, errno = %d\n", errno);

Steve Schmidtke

>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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Re: [uml-devel] Problem with 2.4.22-um4

[Jeff Dike]

steve_schmidtke@hotmail.com said:
> Jeff didn't like a part of my patch, but didn't back out all of the
> related  bits.

Crap.  I backed out the while -> do { ... } while part of that particular
change, but forgot to keep the read -> os_read_file part.

				Jeff



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Re: [uml-devel] Problem with 2.4.22-um4

[Patrick "Petschge" Kilian]

Hi,

Jeff Dike wrote:
>> Jeff didn't like a part of my patch, but didn't back out all of the
>> related  bits.
> Crap.  I backed out the while -> do { ... } while part of that particular
> change, but forgot to keep the read -> os_read_file part.

Doesn't real matter how it happend, as long as the patch on the website is 
fixed.

mfg,
Patrick "Petschge" Kilian

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merken, dass man Sicherheit nicht durch Verschleierung oder durch
Gesetze erreicht.



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