root_fs is an unmodified gentoo 2005.1 athlon-xp stage3. Host is amd64
running 2.6.14-skas3-v9-pre7.
Host glibc is 2.3.5-r2. Host gcc is 3.4.4-r1. 32-bit chroot (see 32-bit
test below) glibc is 2.3.4.20041102-r1, 32-bit chroot's gcc is
3.3.5.20050130-r1. Root_fs is same image as chroot.
Guest kernel is built with defconfig + enabling TT. (Note comment about
processor features at bottom of mail). Guest kernel is vanilla 2.6.15, no
patches applied.
2.6.15 compiled in 64-bit mode:
+++++++++++++++++++++++++++++++
(compiled on 64-bit host *without* adding SUBARCH=i386)
TT: Busy hang
-------------
...
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
ubda: unknown partition table
ubdb: unknown partition table
VFS: Mounted root (ext2 filesystem).
request_module: runaway loop modprobe binfmt-464c
request_module: runaway loop modprobe binfmt-464c
request_module: runaway loop modprobe binfmt-464c
request_module: runaway loop modprobe binfmt-464c
request_module: runaway loop modprobe binfmt-464c
SKAS0: Busy hang
----------------
...
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
ubda: unknown partition table
ubdb: unknown partition table
EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
VFS: Mounted root (ext2 filesystem).
request_module: runaway loop modprobe binfmt-464c
request_module: runaway loop modprobe binfmt-464c
request_module: runaway loop modprobe binfmt-464c
request_module: runaway loop modprobe binfmt-464c
request_module: runaway loop modprobe binfmt-464c
SKAS3: Crash
------------
...
Kernel panic - not syncing: map_stub_pages : /proc/mm map for code failed, err
= 22
Modules linked in:
Pid: 1, comm: swapper Not tainted 2.6.15
RIP: 0033:[<000000006015fad9>]
RSP: 00002aaaaaaacfc0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000003c6b RCX: ffffffffffffffff
RDX: 0000000000000000 RSI: 0000000000000013 RDI: 0000000000003c6b
RBP: 00002aaaaaaacfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000003c68
R13: 00002aaaaaaac000 R14: 00007fffffffe0f8 R15: 00007fffffffe508
Call Trace:
603e3878: [<60012dbf>] panic_exit+0x2d/0x47
603e3898: [<60039c1e>] notifier_call_chain+0x25/0x38
603e38a0: [<6015faa1>] __sigprocmask+0x11/0x40
603e38c8: [<600292c4>] panic+0xe4/0x175
603e3910: [<6000e87c>] copy_to_user_proc+0x0/0x1b
603e3948: [<60170c49>] __syscall_error_1+0x6/0x1d
603e3958: [<600223c3>] file_io+0xac/0xcc
603e3968: [<6016ca20>] __libc_write+0x0/0x80
603e39b8: [<60016da6>] map_stub_pages+0xb5/0x189
603e39d8: [<6004e8b7>] prep_new_page+0x6c/0x75
603e39f8: [<6016c8a3>] __libc_open64+0xc3/0x150
603e3ac8: [<600175a7>] new_mm+0xb4/0xc4
603e3ad8: [<6004f588>] __mod_page_state+0x2c/0x34
603e3b08: [<600582c3>] __pte_alloc+0x4f/0x82
603e3b38: [<600160fe>] init_stub_pte+0x8e/0x13e
603e3b78: [<600162d1>] init_new_context_skas+0x123/0x196
603e3bc8: [<600725c5>] do_execve+0xca/0x235
603e3bf0: [<6000c184>] init+0x0/0x140
603e3c18: [<6000c758>] execve1+0x26/0x77
603e3c58: [<6000c7b4>] um_execve+0xb/0x3c
603e3c78: [<6000c15d>] run_init_process+0x48/0x6f
603e3ca8: [<6000c298>] init+0x114/0x140
603e3cd8: [<6002399b>] run_kernel_thread+0x3e/0x43
603e3ce8: [<6000c184>] init+0x0/0x140
603e3d00: [<6000c184>] init+0x0/0x140
603e3d28: [<6002398a>] run_kernel_thread+0x2d/0x43
603e3d68: [<600103d7>] unblock_signals+0xe/0x10
603e3d78: [<60025b73>] schedule_tail+0x2b/0x186
603e3db0: [<6000c184>] init+0x0/0x140
603e3dc8: [<60017309>] new_thread_handler+0xf6/0x12c
603e3e38: [<6015f820>] __restore_rt+0x0/0x10
603e3ee8: [<6015fad9>] __kill+0x9/0x20
2.6.15 compiled in 32-bit mode:
+++++++++++++++++++++++++++++++
(compiled in 32-bit chroot)
TT: boots but crashes later on
-----------------------------
* Checking all filesystems ...
[ ok ]
* Mounting local filesystems ...
[ ok ]
* Activating (possibly) more swap ...
[ ok ]
* Setting system clock to hardware clock [UML] ...
[ ok ]
* Caching service dependencies ...
[ ok ]
* Configuring kernel parameters ...
[ ok ]
* Updating environment ...
[ ok ]
* Cleaning /var/lock, /var/run ...
Kernel panic - not syncing: Kernel mode fault at addr 0x2f2c, ip 0xa002177a
SKAS0: boots and works fine
---------------------------
SKAS3: busy hang
----------------
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
ubda: unknown partition table
ubdb: unknown partition table
EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
VFS: Mounted root (ext2 filesystem).
Comments
++++++++
When compiling guest for 32-bit I noticed an option for host processor
features, where I could enable generic x86. This option did not appear in
64-bit mode. Is the binfmt stuff due to no 32-bit emulation compatibility?
I have yet to test the 64-bit guest with a 64-bit root_fs. (Maybe it's a
"doh!" on my side that the 64-bit guest kernel doesn't work with 32-bit
root_fs's)
// Joel
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