[Bug runtime/3050] New: print_backtrace() only prints one line of stack on x86_64

["mmlnx at us dot ibm dot com" <sourceware-bugzilla at sourceware dot org>]

print_backtrace() only prints one line of the stack on x86_64.  For example, the
following stap script:

probe kernel.function("schedule@kernel/sched.c") {
        print_backtrace();
}

prints the following output:

trace for 0 (swapper)
 0xffffffff802cdcb5 : __sched_text_start+0x15/0xd32 []
trace for 24322 (sshd)
 0xffffffff802cdcb5 : __sched_text_start+0x15/0xd32 []
trace for 0 (swapper)
 0xffffffff802cdcb5 : __sched_text_start+0x15/0xd32 []

... and so on

The same script on i386 produces the following output:

trace for 16419 (stpd)
 0xc0294616 : schedule+0x2/0xc9a []
 0xf8d3e77d : sit_cleanup+0xc358e/0x0 [ipv6]
 0xc0204955 : tty_write+0x1d3/0x1e4 []
 0xc013217b : autoremove_wake_function+0x0/0x2d []
 0xf8d3e6d7 : sit_cleanup+0xc34e8/0x0 [ipv6]
 0xc015f001 : vfs_read+0xa8/0x14d []
 0xc015f456 : sys_read+0x3c/0x63 []
 0xc0103cab : sysenter_past_esp+0x54/0x79 []
trace for 3658 (sshd)
 0xc0294616 : schedule+0x2/0xc9a []
 0xc0295a17 : schedule_timeout+0x13/0x8e []
 0xc0203d9f : tty_poll+0x53/0x60 []
 0xc016ebfd : do_select+0x352/0x3b8 []
 0xc016f12a : __pollwait+0x0/0x95 []
 0xc016eeb1 : core_sys_select+0x24e/0x26c []
 0xc016f488 : sys_select+0xd1/0x181 []
 0xc015f4b9 : sys_write+0x3c/0x63 []
 0xc0103cab : sysenter_past_esp+0x54/0x79 []

... and so on.

I tested using the CVS code as of 8/14/06.

-- 
           Summary: print_backtrace() only prints one line of stack on
                    x86_64
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: mmlnx at us dot ibm dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=3050

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