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[Bug runtime/10812] New: 2.6.32-rc5: Vector: 300 (Data Access) with systemtap tests


While executing systemtap tests with this week snapshot saw the following
issue,

=================
0:mon> e
cpu 0x0: Vector: 300 (Data Access) at [c0000000fa7c3940]
    pc: c00000000004998c: .memcmp+0x18/0x30
    lr: d000000002785260: ._stp_ctl_write_cmd+0x250/0x840
[stap_3749988c31b9ae53b507a42e405bc1a8_575696]
    sp: c0000000fa7c3bc0
   msr: 8000000000009032
   dar: d0000000015c2064
 dsisr: 40000000
  current = 0xc0000000f793db00
  paca    = 0xc000000001482600
    pid   = 29521, comm = stapio
0:mon> t
[link register   ] d000000002785260 ._stp_ctl_write_cmd+0x250/0x840
[stap_3749988c31b9ae53b507a42e405bc1a8_575696]
[c0000000fa7c3bc0] d00000000278581c ._stp_ctl_write_cmd+0x80c/0x840
[stap_3749988c31b9ae53b507a42e405bc1a8_575696] (unreliable)
[c0000000fa7c3ce0] c0000000001ba72c .vfs_write+0xec/0x1f0
[c0000000fa7c3d80] c0000000001ba958 .SyS_write+0x58/0xb0
[c0000000fa7c3e30] c000000000008570 syscall_exit+0x0/0x40
--- Exception: c00 (System Call) at 00000fffb5fa66cc
SP (fffe757eff0) is in userspace
0:mon> r
R00 = 000000000000006b   R16 = 0000000010017b78
R01 = c0000000fa7c3bc0   R17 = 00000fffe757f5b0
R02 = c000000001377d30   R18 = 0000000010008b18
R03 = 00000000000000ec   R19 = 0000000010008770
R04 = d0000000015c2063   R20 = d0000000015b051c
R05 = 0000000000000014   R21 = d000000002787918
R06 = d0000000027a8938   R22 = 0000000000000014
R07 = 0000000000000048   R23 = d0000000015c2078
R08 = 000000000000005a   R24 = d0000000027885e0
R09 = d0000000027bcf00   R25 = d0000000027876c8
R10 = 0000000000000001   R26 = d0000000027c3000
R11 = c000000000049974   R27 = c0000000fa7c3c40
R12 = d0000000027864b0   R28 = 0000000000000008
R13 = c000000001482600   R29 = d000000002838ba0
R14 = 0000000010009fe0   R30 = d0000000027f0038
R15 = 0000000010011af8   R31 = d0000000027e8ba0
pc  = c00000000004998c .memcmp+0x18/0x30
lr  = d000000002785260 ._stp_ctl_write_cmd+0x250/0x840
[stap_3749988c31b9ae53b507a42e405bc1a8_575696]
msr = 8000000000009032   cr  = 44000444
ctr = 0000000000000014   xer = 0000000000000000   trap =  300
dar = d0000000015c2064   dsisr = 40000000
0:mon> di %pc
c00000000004998c  8c040001      lbzu    r0,1(r4)
c000000000049990  7c601851      subf.   r3,r0,r3
c000000000049994  4102fff4      bdnzt   eq,c000000000049988     #
.memcmp+0x14/0x30
c000000000049998  4e800020      blr
c00000000004999c  38600000      li      r3,0
c0000000000499a0  4e800020      blr
c0000000000499a4  2c050000      cmpwi   r5,0
c0000000000499a8  4081001c      ble     c0000000000499c4        #
.memchr+0x20/0x28
c0000000000499ac  7ca903a6      mtctr   r5
c0000000000499b0  3863ffff      addi    r3,r3,-1
c0000000000499b4  8c030001      lbzu    r0,1(r3)
c0000000000499b8  7c002000      cmpw    r0,r4
c0000000000499bc  4002fff8      bdnzf   eq,c0000000000499b4     #
.memchr+0x10/0x28
c0000000000499c0  4d820020      beqlr   
c0000000000499c4  38600000      li      r3,0
c0000000000499c8  4e800020      blr
0:mon> 
========================

-- 
           Summary: 2.6.32-rc5: Vector: 300 (Data Access) with systemtap
                    tests
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: critical
          Priority: P2
         Component: runtime
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: pavan dot naregundi at in dot ibm dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=10812

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