I can not boot machine with 2.6.20-rc3-mm1 and 2.6.20-rc2-mm1.
I made binary search, patch bellow cause this bug:
$quilt top
patches/sched-improve-sched_clock-on-i686.patch
backtrace which I got by connecting "gdb" to machine:
_raw_spin_lock (lock=0xc06c0c60) at lib/spinlock_debug.c:108
108 for (i = 0; i < loops; i++) {
(gdb) bt
#0 _raw_spin_lock (lock=0xc06c0c60) at lib/spinlock_debug.c:108
#1 0xc056ac42 in _spin_lock (lock=0xc06c0c60) at kernel/spinlock.c:182
#2 0xc011c3bb in vprintk (fmt=0xc0649c00 "<0>BUG: spinlock %s on
CPU#%d, %s/%d\n",
args=0xc1167a84 "") at kernel/printk.c:534
#3 0xc011c6c7 in printk (fmt=0xc0649c00 "<0>BUG: spinlock %s on
CPU#%d, %s/%d\n")
at kernel/printk.c:508
#4 0xc027be42 in spin_bug (lock=0xc06c0c60, msg=0xc065fc00
"recursion") at lib/spinlock_debug.c:61
#5 0xc027c178 in _raw_spin_lock (lock=0xc06c0c60) at lib/spinlock_debug.c:79
#6 0xc056ac42 in _spin_lock (lock=0xc06c0c60) at kernel/spinlock.c:182
#7 0xc011c3bb in vprintk (fmt=0xc0626ed0 "<1>BUG: unable to handle
kernel paging request",
args=0xc1167b8c "") at kernel/printk.c:534
#8 0xc011c6c7 in printk (fmt=0xc0626ed0 "<1>BUG: unable to handle
kernel paging request")
at kernel/printk.c:508
#9 0xc0116de4 in do_page_fault (regs=0xc1167bcc, error_code=0) at
arch/i386/mm/fault.c:555
#10 0xc056b11c in page_fault ()
#11 0xc0808160 in ?? ()
#12 0xc0626ed0 in kallsyms_token_index ()
#13 0xc1167cac in ?? ()
#14 0x00000001 in ?? ()
#15 0xc0808163 in printk_buf.19225 ()
#16 0xc1167c0c in ?? ()
#17 0x00000000 in ?? ()
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