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[Bug runtime/4307] New: execution of current.stp in systemtap-20070331 snapshot causes system to freeze on ppc64.


I have this environment systemtap-20070331 snapshot,kernel-2.6.21-rc3,
elfutils-0.125 arch=ppc64.

But execution of current.stp in systemtap-20070331 snapshot is giving spinlock
lockup and softlockup bug. And system is getting freezed.
======================================================
UG: spinlock lockup on CPU#0, sshd/2380, c0000000007da608
Call Trace:
[C0000000076134C0] [C00000000000FAB0] .show_stack+0x68/0x1b0 (unreliable)
[C000000007613560] [C0000000001AF9E8] ._raw_spin_lock+0x140/0x17c
[C000000007613600] [C00000000036B40C] ._spin_lock+0x10/0x24
[C000000007613680] [C00000000006066C] .task_rq_lock+0x68/0xcc
[C000000007613720] [C00000000002B71C] .kretprobe_trampoline_holder+0x0/0x8
[C000000007613810] [C00000000002B71C] .kretprobe_trampoline_holder+0x0/0x8
[C0000000076138C0] [C00000000002B71C] .kretprobe_trampoline_holder+0x0/0x8
[C000000007613970] [C00000000002B71C] .kretprobe_trampoline_holder+0x0/0x8
[C000000007613AC0] [C000000000201358] .pty_write+0x74/0x90
[C000000007613B40] [C0000000001FE05C] .write_chan+0x378/0x448
[C000000007613C20] [C0000000001F9EA0] .tty_write+0x1a0/0x278
[C000000007613CF0] [C0000000000E6938] .vfs_write+0x120/0x1f0
[C000000007613D90] [C0000000000E7368] .sys_write+0x4c/0x8c
[C000000007613E30] [C0000000000086B4] syscall_exit+0x0/0x40
BUG: spinlock lockup on CPU#6, klogd/1887, c0000000007da608
Call Trace:
[C00000000FD173F0] [C00000000000FAB0] .show_stack+0x68/0x1b0 (unreliable)
[C00000000FD17490] [C0000000001AF9E8] ._raw_spin_lock+0x140/0x17c
[C00000000FD17530] [C00000000036B40C] ._spin_lock+0x10/0x24
[C00000000FD175B0] [C00000000006066C] .task_rq_lock+0x68/0xcc
[C00000000FD17650] [C00000000002B71C] .kretprobe_trampoline_holder+0x0/0x8
[C00000000FD17740] [C00000000002B71C] .kretprobe_trampoline_holder+0x0/0x8
[C00000000FD177F0] [C00000000002B71C] .kretprobe_trampoline_holder+0x0/0x8
[C00000000FD178A0] [C00000000002B71C] .kretprobe_trampoline_holder+0x0/0x8
[C00000000FD17930] [C00000000035CF80] .unix_dgram_sendmsg+0x524/0x638
[C00000000FD17A30] [C0000000002C9CE4] .sock_aio_write+0x164/0x19c
[C00000000FD17B60] [C0000000000E5FF0] .do_sync_write+0xc4/0x124
[C00000000FD17CF0] [C0000000000E6954] .vfs_write+0x13c/0x1f0
[C00000000FD17D90] [C0000000000E7368] .sys_write+0x4c/0x8c
[C00000000FD17E30] [C0000000000086B4] syscall_exit+0x0/0x40
=============================================================

But What I observed is, previous week systemtap is not giving any problem at all.
Could the recent transport changes be the reason for this?

-- 
           Summary: execution of current.stp in systemtap-20070331 snapshot
                    causes system to freeze on ppc64.
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: srinivasa at in dot ibm dot com
                CC: ananth at in dot ibm dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=4307

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