So I finally got around to building 2.6.16-pre3 on my newly upgraded Ubuntu 
"Flatulent Badger" system, like so:

tar xvjf linux-2.6.13-rc3.tar.bz2

cat > allno.config << EOF
CONFIG_MODE_SKAS=y
CONFIG_BINFMT_ELF=y
CONFIG_HOSTFS=y
CONFIG_SYSCTL=y
CONFIG_STDERR_CONSOLE=y
CONFIG_UNIX98_PTYS=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_LBD=y
CONFIG_EXT2_FS=y
CONFIG_PROC_FS=y
EOF
make ARCH=um allnoconfig
make ARCH=um

Run it:

./linux rootfstype=hostfs rw init=/bin/sh

And it's developed yet more verbose error messages:

> Checking for /dev/anon on the host...Not available (open failed with errno
> 2) Using 2.6 host AIO
> io scheduler noop registered (default)
> loop: loaded (max 8 devices)
> Initialized stdio console driver
> parse_chan_pair failed for device 1
> parse_chan_pair failed for device 2
> parse_chan_pair failed for device 3
> parse_chan_pair failed for device 4
> parse_chan_pair failed for device 5
> parse_chan_pair failed for device 6
> parse_chan_pair failed for device 7
> parse_chan_pair failed for device 8
> parse_chan_pair failed for device 9
> parse_chan_pair failed for device 10
> parse_chan_pair failed for device 11
> parse_chan_pair failed for device 12
> parse_chan_pair failed for device 13
> parse_chan_pair failed for device 14
> parse_chan_pair failed for device 15
> Console initialized on /dev/tty0
> VFS: Mounted root (hostfs filesystem).
> idr_remove called for id=1 which is not allocated.
> 0817f984:  [<080f2c7f>] sub_remove+0xef/0x100
> 0817f9a0:  [<0806305a>] set_signals+0x1a/0x30
> 0817f9a8:  [<080905ef>] free_hot_cold_page+0xdf/0x120
> 0817f9ac:  [<080a3633>] kfree+0x23/0x90
> 0817f9c4:  [<080f2cbf>] idr_remove+0x2f/0xc0
> 0817f9dc:  [<080fbd22>] release_dev+0x5e2/0x700
> 0817fa1c:  [<0806b296>] __wake_up+0x46/0x60
> 0817fa44:  [<0806305a>] set_signals+0x1a/0x30
> 0817fa4c:  [<080fb1d5>] init_dev+0x1b5/0x5a0
> 0817fa98:  [<080fbf6f>] tty_open+0x12f/0x380
> 0817fab4:  [<080f340a>] kobject_get+0x1a/0x30
> 0817fac0:  [<080afcff>] cdev_get+0xf/0x20
> 0817fac8:  [<080afeef>] exact_lock+0xf/0x20
> 0817faec:  [<080fbe40>] tty_open+0x0/0x380
> 0817faf4:  [<080afdce>] chrdev_open+0x9e/0x140
> 0817fb14:  [<080afd30>] chrdev_open+0x0/0x140
> 0817fb18:  [<080a57e0>] __dentry_open+0x90/0x190
> 0817fb34:  [<080a5a58>] nameidata_to_filp+0x38/0x50
> 0817fb50:  [<080a593c>] do_filp_open+0x5c/0x60
> 0817fb78:  [<080ec008>] get_request+0x238/0x2f0
> 0817fb98:  [<080a5b4c>] get_unused_fd+0x6c/0xc0
> 0817fbc0:  [<080a5cb1>] do_sys_open+0x51/0xa0
> 0817fbe0:  [<080a5d27>] sys_open+0x27/0x30
> 0817fbe8:  [<080ec008>] get_request+0x238/0x2f0
> 0817fbf4:  [<0805c5fc>] handle_syscall+0xec/0x100
> 0817fbf8:  [<080ec008>] get_request+0x238/0x2f0
> 0817fc14:  [<080ec008>] get_request+0x238/0x2f0
> 0817fc34:  [<080ec008>] get_request+0x238/0x2f0
> 0817fc64:  [<080658d8>] handle_trap+0x28/0x130
> 0817fc8c:  [<08065f44>] userspace+0x1c4/0x220
> 0817fcd8:  [<08054f10>] init+0x0/0x170
> 0817fce4:  [<0805c0c9>] new_thread_handler+0xe9/0x120
>
> sh-3.00#

Came up and ran, but looks really ugly.  Entirely reproducible so far...

Anybody got any ideas?

Rob
-- 
Never bet against the cheap plastic solution.



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