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[Bug kprobes/4039] New: system drops to xmon on executing systemtap-20070210 tests

My environment is RHEL5-RC (kernel 2.6.18-8el5), elfutils
(elfutils-0.124.tar.gz) systemtap(systemtap-20070210.tar.bz2) on p570 lpar system.

I was running systemtap(systemtap-20070210.tar.bz2) tests and system dropped to

Screen looks like this.
FAIL: alarm
FAIL: clock
FAIL: mmap
FAIL: readwrite
FAIL: signal
FAIL: stat
FAIL: statfs
FAIL: 32-bit alarm
FAIL: 32-bit clock
FAIL: 32-bit mmap
FAIL: 32-bit readwrite
FAIL: 32-bit signal
FAIL: 32-bit stat
FAIL: 32-bit statfs

//System crashed///
0:mon> e
cpu 0x0: Vector: d00 (Single Step) at [c0000000778bfbb0]
    pc: d000000000040434
    lr: c000000000029918: .kretprobe_trampoline_holder+0x0/0x8
    sp: c0000000778bfe30
   msr: 8000000040109032
  current = 0xc000000029c99ce0
  paca    = 0xc000000000464300
    pid   = 24713, comm = sh

0:mon> r
R00 = c000000000029918   R16 = 0000000000000000
R01 = c0000000778bfe30   R17 = 0000000000000000
R02 = c000000000579660   R18 = 0000000000000000
R03 = 00000000101118e0   R19 = 0000000000000000
R04 = 00000000ff60f5d8   R20 = 00000000100d65d0
R05 = 00000000ff60f5d8   R21 = 000000000000003d
R06 = 000000000ffb18b8   R22 = 0000000000000001
R07 = 0000000000000004   R23 = 00000000100e0000
R08 = 00000000101118d8   R24 = 00000000100e0000
R09 = c0000000778bfea0   R25 = 00000000ff60f690
R10 = c0000000000ee604   R26 = 00000000ff60f690
R11 = c0000000000112c8   R27 = 00000000101118e0
R12 = 000000000fd8def7   R28 = 00000000ff60fc78
R13 = c000000000464300   R29 = 0000000000000024
R14 = 0000000000000000   R30 = 000000000ffafff4
R15 = 0000000000000000   R31 = 00000000101118d0
pc  = d000000000040434
lr  = c000000000029918 .kretprobe_trampoline_holder+0x0/0x8
msr = 8000000040109032   cr  = 42000422
ctr = c0000000000ee604   xer = 0000000000000000   trap =  d00

0:mon> t
[link register   ] c000000000029918 .kretprobe_trampoline_holder+0x0/0x8
[c0000000778bfe30] c00000000000875c syscall_dotrace+0xc/0x38 (unreliable)
--- Exception: c00 (System Call) at 000000000ff18b64
SP (ff60f5a0) is in userspace

0:mon> di d000000000040434
d000000000040434  7c0802a6      mflr    r0
d000000000040450  7c852378      mr      r5,r4
d000000000040454  7c0802a6      mflr    r0


 Srinivasa DS

           Summary: system drops to xmon on executing systemtap-20070210
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: kprobes
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: srinivasa at in dot ibm dot com

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