Cannot run linux 2.6.14.3 UML on a x86_64

Cannot run linux 2.6.14.3 UML on a x86_64

[Paulo da Silva]

I got the following boot output from
uml linux 2.6.14.3 from a x86_64.

After this, the linux task is looping consuming
100% CPU.

Thanks for any help


01:37:14 Dom Dez 04 Gandalf /VMs/UML $ ./uml
Checking PROT_EXEC mmap in /tmp...OK
UML running in TT mode
tracing thread pid = 19526
[42949372.960000] Checking that ptrace can change system call numbers...OK
[42949372.960000] Checking syscall emulation patch for ptrace...missing
[42949372.960000] Linux version 2.6.14.3 (psergio@Gandalf) (gcc version 
3.4.4 (Gentoo 3.4.4-r1, ssp-3.4.4-1.0, pie-8.7.8)) #1 Sun Dec 4 01:27:59 
WET 2005
[42949372.960000] Built 1 zonelists
[42949372.960000] Kernel command line: ubd0=/VMs/UML/UML1 mem=250M 
eth0=tuntap,,,192.168.1.100 root=98:0
[42949372.960000] PID hash table entries: 1024 (order: 10, 32768 bytes)
[42949372.960000] Dentry cache hash table entries: 32768 (order: 6, 
262144 bytes)
[42949372.960000] Inode-cache hash table entries: 16384 (order: 5, 
131072 bytes)
[42949372.960000] Memory: 243712k available
[42949373.190000] Mount-cache hash table entries: 256
[42949373.190000] Checking that host ptys support output SIGIO...Yes
[42949373.190000] Checking that host ptys support SIGIO on close...No, 
enabling workaround
[42949373.190000] Checking for /dev/anon on the host...Not available 
(open failed with errno 2)
[42949373.190000] softlockup thread 0 started up.
[42949373.190000] Disabling 2.6 AIO in tt mode
[42949373.190000] 2.6 host AIO support not used - falling back to I/O thread
[42949373.190000] NET: Registered protocol family 16
[42949373.190000] mconsole (version 2) initialized on 
/home/psergio/.uml/Pulga/mconsole
[42949373.190000] Netdevice 0 : TUN/TAP backend - IP = 192.168.1.100
[42949373.190000] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
[42949373.190000] Initializing Cryptographic API
[42949373.200000] io scheduler noop registered
[42949373.200000] io scheduler anticipatory registered
[42949373.200000] io scheduler deadline registered
[42949373.200000] io scheduler cfq registered
[42949373.200000] RAMDISK driver initialized: 16 RAM disks of 4096K size 
1024 blocksize
[42949373.200000] loop: loaded (max 8 devices)
[42949373.200000] NET: Registered protocol family 2
[42949373.420000] IP route cache hash table entries: 2048 (order: 2, 
16384 bytes)
[42949373.420000] TCP established hash table entries: 8192 (order: 4, 
65536 bytes)
[42949373.420000] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
[42949373.420000] TCP: Hash tables configured (established 8192 bind 8192)
[42949373.420000] TCP reno registered
[42949373.420000] TCP bic registered
[42949373.420000] NET: Registered protocol family 1
[42949373.420000] NET: Registered protocol family 17
[42949373.420000] NET: Registered protocol family 15
[42949373.420000] Initialized stdio console driver
[42949373.420000] Console initialized on /dev/tty0
[42949373.420000] Initializing software serial port version 1
[42949373.420000]  ubda: unknown partition table
[42949373.460000] VFS: Mounted root (ext2 filesystem) readonly.
[42949373.490000] request_module: runaway loop modprobe binfmt-464c
[42949373.490000] request_module: runaway loop modprobe binfmt-464c
[42949373.490000] request_module: runaway loop modprobe binfmt-464c
[42949373.490000] request_module: runaway loop modprobe binfmt-464c
[42949373.490000] request_module: runaway loop modprobe binfmt-464c
[42949478.090000] oom-killer: gfp_mask=0xd0, order=0
[42949478.090000] Mem-info:
[42949478.090000] DMA per-cpu:
[42949478.090000] cpu 0 hot: low 62, high 186, batch 31 used:94
[42949478.090000] cpu 0 cold: low 0, high 62, batch 31 used:23
[42949478.090000] Normal per-cpu: empty
[42949478.090000] HighMem per-cpu: empty
[42949478.090000] Free pages:        1964kB (0kB HighMem)
[42949478.090000] Active:7 inactive:7 dirty:0 writeback:0 unstable:0 
free:491 slab:60250 mapped:0 pagetables:0
[42949478.090000] DMA free:1964kB min:2020kB low:2524kB high:3028kB 
active:28kB inactive:28kB present:256000kB pages_scanned:42 
all_unreclaimable? no
[42949478.090000] lowmem_reserve[]: 0 0 0
[42949478.090000] Normal free:0kB min:0kB low:0kB high:0kB active:0kB 
inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
[42949478.090000] lowmem_reserve[]: 0 0 0
[42949478.090000] HighMem free:0kB min:128kB low:160kB high:192kB 
active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
[42949478.090000] lowmem_reserve[]: 0 0 0
[42949478.090000] DMA: 1*4kB 1*8kB 0*16kB 1*32kB 0*64kB 1*128kB 1*256kB 
1*512kB 1*1024kB 0*2048kB 0*4096kB = 1964kB
[42949478.090000] Normal: empty
[42949478.090000] HighMem: empty
[42949478.090000] Swap cache: add 0, delete 0, find 0/0, race 0+0
[42949478.090000] Free swap  = 0kB
[42949478.090000] Total swap = 0kB
[42949478.090000] Free swap:            0kB
[42949478.090000] 64000 pages of RAM
[42949478.090000] 0 pages of HIGHMEM
[42949478.090000] 2984 reserved pages
[42949478.090000] 7 pages shared
[42949478.090000] 0 pages swap cached
[42949488.060000] BUG: soft lockup detected on CPU#0!
[42949488.060000]
[42949488.060000] Modules linked in:
[42949488.060000] Pid: 5, comm: khelper Not tainted 2.6.14.3
[42949488.060000] RIP: 0000:[<0000000000000202>]
[42949488.060000] RSP: 0000000000000008  EFLAGS: 613c3440
[42949488.060000] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 
00000000439248d2
[42949488.060000] RDX: 0000000000003ff8 RSI: 0000000000000000 RDI: 
0000000000000000
[42949488.060000] RBP: 00000000613c0000 R08: 00000000613c31b0 R09: 
0000000000000001
[42949488.060000] R10: 00000000613c31c0 R11: 00000000613c3450 R12: 
00000000613c34e0
[42949488.060000] R13: 00000000601b8520 R14: 00000000613c34e0 R15: 
00000000601b8520
[42949488.060000] Call Trace:
[42949488.060000] 613c3168:  [<6004fd44>] softlockup_tick+0x64/0x70
[42949488.060000] 613c3188:  [<60039718>] do_timer+0x48/0x110
[42949488.060000] 613c31a8:  [<6001673b>] boot_timer_handler+0x1b/0x20
[42949488.060000] 613c31e8:  [<601b8520>] __restore_rt+0x0/0x9
[42949488.060000] 613c31f8:  [<601b8520>] __restore_rt+0x0/0x9
[42949488.060000] 613c32a8:  [<600157f8>] set_signals+0x68/0x180
[42949488.060000] 613c32e8:  [<6003930a>] update_wall_time+0x1a/0x60
[42949488.060000] 613c3308:  [<60039718>] do_timer+0x48/0x110
[42949488.060000] 613c3348:  [<601b8520>] __restore_rt+0x0/0x9
[42949488.060000] 613c3358:  [<601b8520>] __restore_rt+0x0/0x9
[42949488.060000] 613c3378:  [<601b8520>] __restore_rt+0x0/0x9
[42949488.060000] 613c3388:  [<60015713>] enable_mask+0x43/0x60
[42949488.060000] 613c3398:  [<601b879d>] sigemptyset+0x15/0x34
[42949488.060000] 613c33a8:  [<60015813>] set_signals+0x83/0x180
[42949488.060000] 613c33d8:  [<601b879d>] sigemptyset+0x15/0x34
[42949488.060000] 613c33e8:  [<60015681>] change_signals+0x51/0x80
[42949488.060000] 613c3418:  [<60015713>] enable_mask+0x43/0x60
[42949488.060000] 613c3428:  [<601b879d>] sigemptyset+0x15/0x34
[42949488.060000] 613c3438:  [<600157f5>] set_signals+0x65/0x180
[42949488.060000] 613c34e8:  [<60016959>] time_unlock+0x9/0x10
[42949488.060000] 613c34f8:  [<6001646f>] do_gettimeofday+0x7f/0x90
[42949488.060000] 613c3518:  [<600346c5>] getnstimeofday+0x15/0x40
[42949488.060000] 613c3548:  [<60045d3a>] 
do_posix_clock_monotonic_gettime_parts+0x2a/0x70
[42949488.060000] 613c3578:  [<60045d98>] 
do_posix_clock_monotonic_get+0x18/0x60
[42949488.060000] 613c35a8:  [<60045df1>] 
do_posix_clock_monotonic_gettime+0x11/0x20
[42949488.060000] 613c35b8:  [<6005501e>] select_bad_process+0x1e/0x120
[42949488.060000] 613c35c8:  [<6005531a>] oom_kill_process+0x5a/0x70
[42949488.060000] 613c35f8:  [<60055355>] out_of_memory+0x25/0xa0
[42949488.060000] 613c3628:  [<60056468>] __alloc_pages+0x3f8/0x440
[42949488.060000] 613c3668:  [<60015713>] enable_mask+0x43/0x60
[42949488.060000] 613c3690:  [<60019740>] new_thread_proc+0x0/0x50
[42949488.060000] 613c36a8:  [<600564cf>] __get_free_pages+0x1f/0x60
[42949488.060000] 613c36b8:  [<600133c0>] alloc_stack+0x20/0x50
[42949488.060000] 613c36d8:  [<60019a17>] copy_thread_tt+0xa7/0x200
[42949488.060000] 613c3748:  [<60013711>] copy_thread+0x81/0xa0
[42949488.060000] 613c3898:  [<6002c3e9>] copy_process+0x549/0x10b0
[42949488.060000] 613c38d8:  [<60015713>] enable_mask+0x43/0x60
[42949488.060000] 613c38e8:  [<601b879d>] sigemptyset+0x15/0x34
[42949488.060000] 613c38f8:  [<600158dc>] set_signals+0x14c/0x180
[42949488.060000] 613c3918:  [<60015713>] enable_mask+0x43/0x60
[42949488.060000] 613c3928:  [<601b879d>] sigemptyset+0x15/0x34
[42949488.060000] 613c3938:  [<600158dc>] set_signals+0x14c/0x180
[42949488.060000] 613c39e8:  [<6001947c>] switch_to_tt+0x11c/0x190
[42949488.060000] 613c3a48:  [<6002d07b>] do_fork+0x9b/0x240
[42949488.060000] 613c3a88:  [<601b879d>] sigemptyset+0x15/0x34
[42949488.060000] 613c3a98:  [<60015713>] enable_mask+0x43/0x60
[42949488.060000] 613c3ab8:  [<60015813>] set_signals+0x83/0x180
[42949488.060000] 613c3b08:  [<60041e40>] __call_usermodehelper+0x0/0x60
[42949488.060000] 613c3b18:  [<6001345c>] kernel_thread+0x6c/0x80
[42949488.060000] 613c3b48:  [<60041e65>] __call_usermodehelper+0x25/0x60
[42949488.060000] 613c3b68:  [<6004239f>] worker_thread+0x28f/0x350
[42949488.060000] 613c3bf0:  [<60029ef0>] default_wake_function+0x0/0x10
[42949488.060000] 613c3c20:  [<60029ef0>] default_wake_function+0x0/0x10
[42949488.060000] 613c3c58:  [<60042110>] worker_thread+0x0/0x350
[42949488.060000] 613c3c78:  [<6004693c>] kthread+0xbc/0xf0
[42949488.060000] 613c3ca8:  [<60046880>] kthread+0x0/0xf0
[42949488.060000] 613c3cc8:  [<60027e30>] run_kernel_thread+0x40/0x50
[42949488.060000] 613c3cd8:  [<60046880>] kthread+0x0/0xf0
[42949488.060000] 613c3cf0:  [<60046880>] kthread+0x0/0xf0
[42949488.060000] 613c3d18:  [<60027e1d>] run_kernel_thread+0x2d/0x50
[42949488.060000] 613c3d98:  [<60046880>] kthread+0x0/0xf0
[42949488.060000] 613c3da8:  [<600156ce>] unblock_signals+0xe/0x10
[42949488.060000] 613c3db8:  [<60019706>] new_thread_handler+0x166/0x1a0
[42949488.060000] 613c3e38:  [<601b8520>] __restore_rt+0x0/0x9
[42949488.060000] 613c3ee8:  [<601b8655>] sigprocmask+0x11/0x3c
[42949488.060000]

Re: Cannot run linux 2.6.14.3 UML on a x86_64

[Paulo da Silva]

Jeff Dike wrote:

>On Sun, Dec 04, 2005 at 01:49:32AM +0000, Paulo da Silva wrote:
>  
>
>>I got the following boot output from
>>uml linux 2.6.14.3 from a x86_64.
>>    
>>
>
>Are you using a 32 or 64-bit filesystem?
>  
>
I did a mke2fs running on a 64 bits (x86_64) system.
Is there a way to specify that a filesystem is for 64 bits?

>And why it is running in tt mode?  CONFIG_MODE_SKAS is disabled?
>
>				Jeff
>  
>
I am using linux for 64 bits since a couple of days before.
I did not patch the host kernel with skas yet.
Besides performance, is there any other reason to use it?

Re: Cannot run linux 2.6.14.3 UML on a x86_64

[Jeff Dike]

On Sun, Dec 04, 2005 at 01:49:32AM +0000, Paulo da Silva wrote:
> I got the following boot output from
> uml linux 2.6.14.3 from a x86_64.

Are you using a 32 or 64-bit filesystem?

And why it is running in tt mode?  CONFIG_MODE_SKAS is disabled?

				Jeff

Re: Cannot run linux 2.6.14.3 UML on a x86_64

[Jeff Dike]

On Sun, Dec 04, 2005 at 04:12:56AM +0000, Paulo da Silva wrote:
> I did a mke2fs running on a 64 bits (x86_64) system.
> Is there a way to specify that a filesystem is for 64 bits?

Yeah, you fill it with either 64 or 32-bit binaries.

> I am using linux for 64 bits since a couple of days before.
> I did not patch the host kernel with skas yet.

UML no longer requires patching the host in order to use skas mode.

> Besides performance, is there any other reason to use it?

It works.  I have never really tested tt mode on x86_64.

				Jeff

STILL Cannot run linux 2.6.14.3 UML on a x86_64

[Paulo da Silva]

Jeff Dike wrote:

>On Sun, Dec 04, 2005 at 04:12:56AM +0000, Paulo da Silva wrote:
>  
>
> ...
>
>It works.  I have never really tested tt mode on x86_64.
>
>  
>
Cannot get it running !!!
It stops, consuming variable amounts of cpu.
The same configuration works perfectly on a 32 bits system.

Here is the console output.

Checking PROT_EXEC mmap in /tmp...OK
Checking for /proc/mm...not found
Checking for the skas3 patch in the host...not found
UML running in SKAS0 mode
[42949372.960000] Checking that ptrace can change system call numbers...OK
[42949372.960000] Checking syscall emulation patch for ptrace...missing
[42949372.960000] Linux version 2.6.14.3 (psergio@Gandalf) (gcc version 
3.4.4 (Gentoo 3.4.4-r1, ssp-3.4.4-1.0, pie-8.7.8)) #1 Thu Dec 8 01:13:35 
WET 2005
[42949372.960000] Built 1 zonelists
[42949372.960000] Kernel command line: ubd0=/VMs/UML/UML1 mem=250M 
eth0=tuntap,,,192.168.1.100 root=98:0
[42949372.960000] PID hash table entries: 1024 (order: 10, 32768 bytes)
[42949372.960000] Dentry cache hash table entries: 32768 (order: 6, 
262144 bytes)
[42949372.960000] Inode-cache hash table entries: 16384 (order: 5, 
131072 bytes)
[42949372.960000] Memory: 243712k available
[42949373.180000] Mount-cache hash table entries: 256
[42949373.180000] Checking that host ptys support output SIGIO...Yes
[42949373.180000] Checking that host ptys support SIGIO on close...No, 
enabling workaround
[42949373.180000] Checking for /dev/anon on the host...Not available 
(open failed with errno 2)
[42949373.180000] softlockup thread 0 started up.
[42949373.180000] Using 2.6 host AIO
[42949373.180000] NET: Registered protocol family 16
[42949373.180000] mconsole (version 2) initialized on 
/home/psergio/.uml/Pulga/mconsole
[42949373.180000] Netdevice 0 : TUN/TAP backend - IP = 192.168.1.100
[42949373.180000] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
[42949373.180000] Initializing Cryptographic API
[42949373.230000] io scheduler noop registered
[42949373.230000] io scheduler anticipatory registered
[42949373.230000] io scheduler deadline registered
[42949373.230000] io scheduler cfq registered
[42949373.230000] RAMDISK driver initialized: 16 RAM disks of 4096K size 
1024 blocksize
[42949373.250000] loop: loaded (max 8 devices)
[42949373.250000] NET: Registered protocol family 2
[42949373.390000] IP route cache hash table entries: 2048 (order: 2, 
16384 bytes)
[42949373.390000] TCP established hash table entries: 8192 (order: 4, 
65536 bytes)
[42949373.390000] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
[42949373.390000] TCP: Hash tables configured (established 8192 bind 8192)
[42949373.390000] TCP reno registered
[42949373.390000] TCP bic registered
[42949373.390000] NET: Registered protocol family 1
[42949373.390000] NET: Registered protocol family 17
[42949373.390000] NET: Registered protocol family 15
[42949373.390000] Initialized stdio console driver
[42949373.390000] Console initialized on /dev/tty0
[42949373.390000] Initializing software serial port version 1
[42949373.390000]  ubda: unknown partition table
[42949373.390000] VFS: Mounted root (ext2 filesystem) readonly.
[42949373.490000] request_module: runaway loop modprobe binfmt-464c
[42949373.490000] request_module: runaway loop modprobe binfmt-464c
[42949373.490000] request_module: runaway loop modprobe binfmt-464c
[42949373.490000] request_module: runaway loop modprobe binfmt-464c
[42949373.490000] request_module: runaway loop modprobe binfmt-464c

Re: STILL Cannot run linux 2.6.14.3 UML on a x86_64

[Jeff Dike]

On Thu, Dec 08, 2005 at 01:36:04AM +0000, Paulo da Silva wrote:
> Cannot get it running !!!
> It stops, consuming variable amounts of cpu.
> The same configuration works perfectly on a 32 bits system.

> [42949373.490000] request_module: runaway loop modprobe binfmt-464c
> [42949373.490000] request_module: runaway loop modprobe binfmt-464c
> [42949373.490000] request_module: runaway loop modprobe binfmt-464c
> [42949373.490000] request_module: runaway loop modprobe binfmt-464c
> [42949373.490000] request_module: runaway loop modprobe binfmt-464c

You never answered my question about whether this was a 32 or 64 bit
filesystem.

				Jeff

Re: STILL Cannot run linux 2.6.14.3 UML on a x86_64

[Paulo da Silva]

Jeff Dike wrote:

> ...


>You never answered my question about whether this was a 32 or 64 bit
>filesystem.
>
>  
>
This became a great confusion! I noticed that when
UML crashes, restarting a "previous working copy"
does not work either until a reboot is done (may be
something else could be done ...).

So I decided to start from the scratch ...
I created a disk image with ext2 and a 64 bits gentoo
system (this answers to your question).
Recompiled the kernel (a new copy). Everything
on a 64 bits system. I tried skas and non skas mode.
I'm sending both outputs.
TT mode just crashes.
SKAS mode starts looping somewhere consuming CPU.

The same procedure for 32 bits worked fine for TT mode
only. SKAS mode does not work.

Thank you.


Checking PROT_EXEC mmap in /tmp...OK
UML running in TT mode
tracing thread pid = 19319
[42949372.960000] Checking that ptrace can change system call numbers...OK
[42949372.960000] Checking syscall emulation patch for ptrace...missing
[42949372.960000] Linux version 2.6.14.3 (psergio@Gandalf) (gcc version 
3.4.4 (Gentoo 3.4.4-r1, ssp-3.4.4-1.0, pie-8.7.8)) #1 Sun Dec 11 
18:56:37 WET 2005
[42949372.960000] Built 1 zonelists
[42949372.960000] Kernel command line: ubd0=/VMs/UML/UML1 mem=250M 
eth0=tuntap,,,192.168.1.100 root=98:0
[42949372.960000] PID hash table entries: 1024 (order: 10, 32768 bytes)
[42949372.960000] Dentry cache hash table entries: 32768 (order: 6, 
262144 bytes)
[42949372.960000] Inode-cache hash table entries: 16384 (order: 5, 
131072 bytes)
[42949372.960000] Memory: 243712k available
[42949373.180000] Mount-cache hash table entries: 256
[42949373.180000] Checking that host ptys support output SIGIO...Yes
[42949373.180000] Checking that host ptys support SIGIO on close...No, 
enabling workaround
[42949373.180000] Checking for /dev/anon on the host...Not available 
(open failed with errno 2)
[42949373.180000] softlockup thread 0 started up.
[42949373.180000] Disabling 2.6 AIO in tt mode
[42949373.180000] 2.6 host AIO support not used - falling back to I/O thread
[42949373.180000] NET: Registered protocol family 16
[42949373.180000] mconsole (version 2) initialized on 
/home/psergio/.uml/Pulga/mconsole
[42949373.180000] Netdevice 0 : TUN/TAP backend - IP = 192.168.1.100
[42949373.180000] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
[42949373.180000] Initializing Cryptographic API
[42949373.340000] io scheduler noop registered
[42949373.340000] io scheduler anticipatory registered
[42949373.340000] RAMDISK driver initialized: 16 RAM disks of 4096K size 
1024 blocksize
[42949373.340000] loop: loaded (max 8 devices)
[42949373.340000] NET: Registered protocol family 2
[42949373.550000] IP route cache hash table entries: 2048 (order: 2, 
16384 bytes)
[42949373.550000] TCP established hash table entries: 8192 (order: 4, 
65536 bytes)
[42949373.550000] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
[42949373.550000] TCP: Hash tables configured (established 8192 bind 8192)
[42949373.550000] TCP reno registered
[42949373.550000] TCP bic registered
[42949373.550000] NET: Registered protocol family 1
[42949373.550000] NET: Registered protocol family 17
[42949373.550000] NET: Registered protocol family 15
[42949373.550000] Initialized stdio console driver
[42949373.550000] Console initialized on /dev/tty0
[42949373.550000] Initializing software serial port version 1
[42949373.550000]  ubda: unknown partition table
[42949373.600000] VFS: Mounted root (ext2 filesystem) readonly.
[42949373.650000] Kernel panic - not syncing: Kernel mode fault at addr 
0x0, ip 0x0
[42949373.650000]
[42949373.650000] Modules linked in:
[42949373.650000] Pid: 1, comm: init Not tainted 2.6.14.3
[42949373.650000] RIP: 0000:[<0000000000000000>]
[42949373.650000] RSP: 0000000061383c30  EFLAGS: 00010202
[42949373.650000] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 
00000000601b3c25
[42949373.650000] RDX: 0000000060027e1d RSI: 0000000000000001 RDI: 
0000000061383ad0
[42949373.650000] RBP: 0000000000000000 R08: 0000000000000000 R09: 
0000000000000000
[42949373.650000] R10: 0000000000000008 R11: 0000000000000246 R12: 
0000000000000000
[42949373.650000] R13: 0000000000000001 R14: 000000000000000a R15: 
00000000602b1988
[42949373.650000] Call Trace:
[42949373.650000] 613836d8:  [<6001850f>] panic_exit+0x2f/0x50
[42949373.650000] 613836f8:  [<6003e3cb>] notifier_call_chain+0x2b/0x50
[42949373.650000] 61383728:  [<6002d794>] panic+0xe4/0x180
[42949373.650000] 61383768:  [<601b3c25>] sigprocmask+0x11/0x3c
[42949373.650000] 61383798:  [<60017670>] handle_page_fault+0x1d0/0x2b0
[42949373.650000] 61383818:  [<60017944>] segv+0x1f4/0x2f0
[42949373.650000] 61383828:  [<601b3d6d>] sigemptyset+0x15/0x34
[42949373.650000] 61383838:  [<60015611>] change_sig+0x61/0x80
[42949373.650000] 613838a8:  [<601b3d6d>] sigemptyset+0x15/0x34
[42949373.650000] 613838b8:  [<60015681>] change_signals+0x51/0x80
[42949373.650000] 61383928:  [<60017cfe>] segv_handler+0x9e/0xb0
[42949373.650000] 61383968:  [<6001b259>] sig_handler_common_tt+0x109/0x1b0
[42949373.650000] 613839d8:  [<60027e50>] sig_handler+0x10/0x20
[42949373.650000] 613839e8:  [<601b3af0>] __restore_rt+0x0/0x9
[42949373.650000] 61383a78:  [<60027e1d>] run_kernel_thread+0x2d/0x50
[42949373.650000] 61383a88:  [<601b3c25>] sigprocmask+0x11/0x3c
[42949373.650000] 61383ae0:  [<600101b0>] init+0x0/0x160
[42949373.650000] 61383b08:  [<60027e1d>] run_kernel_thread+0x2d/0x50
[42949373.650000] 61383b88:  [<600101b0>] init+0x0/0x160
[42949373.650000] 61383b98:  [<600156ce>] unblock_signals+0xe/0x10
[42949373.650000] 61383ba8:  [<60019706>] new_thread_handler+0x166/0x1a0
[42949373.650000] 61383cd8:  [<601b3c25>] sigprocmask+0x11/0x3c
[42949373.650000]
[42949373.650000]
___________________________________________________________________________________

Checking PROT_EXEC mmap in /tmp...OK
Checking for /proc/mm...not found
Checking for the skas3 patch in the host...not found
UML running in SKAS0 mode
[42949372.960000] Checking that ptrace can change system call numbers...OK
[42949372.960000] Checking syscall emulation patch for ptrace...missing
[42949372.960000] Linux version 2.6.14.3 (psergio@Gandalf) (gcc version 
3.4.4 (Gentoo 3.4.4-r1, ssp-3.4.4-1.0, pie-8.7.8)) #1 Sun Dec 11 
19:16:39 WET 2005
[42949372.960000] Built 1 zonelists
[42949372.960000] Kernel command line: ubd0=/VMs/UML/UML1 mem=250M 
eth0=tuntap,,,192.168.1.100 root=98:0
[42949372.960000] PID hash table entries: 1024 (order: 10, 32768 bytes)
[42949372.960000] Dentry cache hash table entries: 32768 (order: 6, 
262144 bytes)
[42949372.960000] Inode-cache hash table entries: 16384 (order: 5, 
131072 bytes)
[42949372.960000] Memory: 243712k available
[42949373.190000] Mount-cache hash table entries: 256
[42949373.190000] Checking that host ptys support output SIGIO...Yes
[42949373.190000] Checking that host ptys support SIGIO on close...No, 
enabling workaround
[42949373.190000] Checking for /dev/anon on the host...Not available 
(open failed with errno 2)
[42949373.190000] softlockup thread 0 started up.
[42949373.190000] Using 2.6 host AIO
[42949373.190000] NET: Registered protocol family 16
[42949373.190000] mconsole (version 2) initialized on 
/home/psergio/.uml/Pulga/mconsole
[42949373.190000] Netdevice 0 : TUN/TAP backend - IP = 192.168.1.100
[42949373.190000] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
[42949373.190000] Initializing Cryptographic API
[42949373.210000] io scheduler noop registered
[42949373.210000] io scheduler anticipatory registered
[42949373.210000] RAMDISK driver initialized: 16 RAM disks of 4096K size 
1024 blocksize
[42949373.210000] loop: loaded (max 8 devices)
[42949373.210000] NET: Registered protocol family 2
[42949373.360000] IP route cache hash table entries: 2048 (order: 2, 
16384 bytes)
[42949373.360000] TCP established hash table entries: 8192 (order: 4, 
65536 bytes)
[42949373.360000] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
[42949373.360000] TCP: Hash tables configured (established 8192 bind 8192)
[42949373.360000] TCP reno registered
[42949373.360000] TCP bic registered
[42949373.360000] NET: Registered protocol family 1
[42949373.360000] NET: Registered protocol family 17
[42949373.360000] NET: Registered protocol family 15
[42949373.360000] Initialized stdio console driver
[42949373.360000] Console initialized on /dev/tty0
[42949373.360000] Initializing software serial port version 1
[42949373.360000]  ubda: unknown partition table
[42949373.360000] VFS: Mounted root (ext2 filesystem) readonly.

---------- HANGS HERE CONSUMING CPU!