[Pkg-uml-pkgs] Bug#410154: user-mode-linux: crashes almost immediately with Kernel mode signal 7

[Brian Brunswick]

Package: user-mode-linux
Version: 2.6.18-1um-2
Severity: grave
Justification: renders package unusable


It crashes out almost immediately. 

The crash can be slightly varied by changing the memory size, or it will even get almost all the way
through a simple boot up, but always dies:

Only thing I'm doing odd, is host system is running sarge, kernel from backports.org, we are in a chroot....
But surely that should make no difference!

I started off trying vde2 virtual networking, but thats not the problem since it happens even without it.

(sid)root at amonsul:/# uname -a
Linux amonsul 2.6.18-3-k7 #1 SMP Thu Dec 14 20:27:48 CET 2006 i686 GNU/Linux

Hmm, the host is a SMP dual athlon setup - perhaps thats the problem?


Eg:

(sid)root at amonsul:/# linux  con0=fd:0,fd:1 con=pts root=/dev/root rootflags=/ rootfstype=hostfs ro init=/bin/bash 
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...OK
Checking advanced syscall emulation patch for ptrace...OK
Checking for tmpfs mount on /dev/shm...OK
Checking PROT_EXEC mmap in /dev/shm/...OK
Checking for the skas3 patch in the host:
  - /proc/mm...not found
  - PTRACE_FAULTINFO...not found
  - PTRACE_LDT...not found
UML running in SKAS0 mode
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...OK
Checking advanced syscall emulation patch for ptrace...OK
Linux version 2.6.18 (root at tadamune) (gcc version 4.1.2 20061028 (prerelease) (Debian 4.1.1-19)) #2 Thu Nov 9 19:27:34 CET 2006
Built 1 zonelists.  Total pages: 8192
Kernel command line: con0=fd:0,fd:1 con=pts root=/dev/root rootflags=/ rootfstype=hostfs ro init=/bin/bash
PID hash table entries: 256 (order: 8, 1024 bytes)
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Memory: 29424k available
Mount-cache hash table entries: 512
Checking for host processor cmov support...Yes
Checking for host processor xmm support...No
Checking that host ptys support output SIGIO...Yes
Checking that host ptys support SIGIO on close...No, enabling workaround
Using 2.6 host AIO
NET: Registered protocol family 16
NET: Registered protocol family 2
IP route cache hash table entries: 256 (order: -2, 1024 bytes)
TCP established hash table entries: 1024 (order: 0, 4096 bytes)
TCP bind hash table entries: 512 (order: -1, 2048 bytes)
TCP: Hash tables configured (established 1024 bind 512)
TCP reno registered
Checking host MADV_REMOVE support...OK
mconsole (version 2) initialized on /root/.uml/oeC8TB/mconsole
ubd: Synchronous mode
Host TLS support detected
Detected host type: i386
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
Initializing Cryptographic API
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: loaded (max 8 devices)
nbd: registered device at major 43
device-mapper: ioctl: 4.7.0-ioctl (2006-06-24) initialised: dm-devel at redhat.com
IPv4 over IPv4 tunneling driver
GRE over IPv4 tunneling driver
TCP bic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
Initialized stdio console driver
Console initialized on /dev/tty0
Initializing software serial port version 1
Failed to open 'root_fs', errno = 2
VFS: Mounted root (hostfs filesystem) readonly.
(sid)root@(none):/# ifconfig
modprobe: FATAL: Could not load /lib/modules/2.6.18/modules.dep: No such file or directory

modprobe: FATAL: Could not load /lib/modules/2.6.18/modules.dep: No such file or directory

modprobe: FATAL: Could not load /lib/modules/2.6.18/modules.dep: No such file or directory

modprobe: FATAL: Could not load /lib/modules/2.6.18/modules.dep: No such file or directory

modprobe: FATAL: Could not load /lib/modules/2.6.18/modules.dep: No such file or directory

modprobe: FATAL: Could not load /lib/modules/2.6.18/modules.dep: No such file or directory

(sid)root@(none):/# mount -t hostfs -o /usr/lib/uml/modules hostfs /lib/modules
(sid)root@(none):/# ifconfig
Kernel panic - not syncing: Kernel mode signal 7
 
EIP: 0073:[<400ea0ce>] CPU: 0 Not tainted ESP: 007b:7f47eb70 EFLAGS: 00000246
    Not tainted
EAX: ffffffda EBX: 40151000 ECX: 003d0550 EDX: 08050d40
ESI: 08050d40 EDI: 08050d40 EBP: 7f47ebf8 DS: 007b ES: 007b
0837f66c:  [<080701b4>] show_regs+0xb4/0xb9
0837f698:  [<0805e6a3>] panic_exit+0x25/0x3f
0837f6ac:  [<080806b8>] notifier_call_chain+0x1d/0x37
0837f6cc:  [<08080742>] atomic_notifier_call_chain+0x11/0x13
0837f6e0:  [<08074a72>] panic+0x52/0xd3
0837f700:  [<0805e093>] relay_signal+0x30/0x69
0837f720:  [<0806dd5a>] sig_handler_common_skas+0xc6/0xec
0837f748:  [<0806ad32>] sig_handler+0x33/0x41
0837f75c:  [<aff72420>] 0xaff72420
0837fa44:  [<0805f14f>] do_op_one_page+0x3b/0x40
0837fa58:  [<0805f20f>] do_buffer_op+0xbb/0x12b
0837fa98:  [<0806bc88>] setjmp_wrapper+0x34/0x3d
0837fb4c:  [<0805f2a6>] buffer_op+0x27/0x52
0837fb80:  [<0805f36f>] copy_from_user_skas+0x76/0x84
0837fba8:  [<0808c982>] load_module+0x40/0x917
0837fc50:  [<0808d298>] sys_init_module+0x3f/0x15b
0837fc6c:  [<0805eeaf>] handle_syscall+0x87/0xa0
0837fcb8:  [<0806d812>] userspace+0x1fc/0x240
0837fd00:  [<0805eb12>] new_thread_handler+0x9c/0xab
0837fd1c:  [<aff72420>] 0xaff72420

 
-- System Information:
Debian Release: 4.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-3-k7
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)

Versions of packages user-mode-linux depends on:
ii  uml-utilities                 20060323-3 User-mode Linux (utility programs)

user-mode-linux recommends no packages.

-- no debconf information