[Bug runtime/3051] New: print_backtrace() prints most of stack on a single line on ppc64

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

print_backtrace() prints most of the stack on a single line on ppc64, making it
difficult to read.  For example, the following stap script:

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

prints the following output:

trace for 21638 (stpd)
 0xc00000000036c494 : .schedule+0x54/0xe48 []
[c0000000d1e6f868] [d00000000075b198] 0xd00000000075b198 :
.ipv6_netfilter_init+0x239a0c/0x0 [ipv6] (unreliable)[c0000000d1e6fae0]
[c0000000d1e6fb80] 0xc0000000d1e6fb80 :
__initramfs_end+0xd1a3bafd/0xfffffffffbf0f7d [][c0000000d1e6fbf0]
[d0000000006b75dc] 0xd0000000006b75dc : .ipv6_netfilter_init+0x195e50/0x0
[ipv6][c0000000d1e6fcf0] [c0000000000c5d68] 0xc0000000000c5d68 :
.vfs_read+0x128/0x20c [][c0000000d1e6fd90] [c0000000000c6248] 0xc0000000000c6248
: .sys_read+0x4c/0x8c [][c0000000d1e6fe30] [c00000000000871c] 0xc00000000000871c
: syscall_exit+0x0/0x40 []--- Exception: c01 at 0xffd7738
    LR =0x10003110
trace for 20900 (sshd)
 0xc00000000036c494 : .schedule+0x54/0xe48 []
[c0000000d8307668] [7fffffffffffffff] 0x7fffffffffffffff
(unreliable)[c0000000d83078e0] [c000000000056540] 0xc000000000056540 :
.__wake_up+0x54/0x88 [][c0000000d83079f0] [c00000000036e078] 0xc00000000036e078
: .schedule_timeout+0x40/0xec [][c0000000d8307ac0] [c0000000000e0ab4]
0xc0000000000e0ab4 : .do_select+0x3d4/0x488 [][c0000000d8307c10]
[c0000000000fefc0] 0xc0000000000fefc0 : .compat_core_sys_select+0x17c/0x224
[][c0000000d8307d00] [c0000000001012a4] 0xc0000000001012a4 :
.compat_sys_select+0xd0/0x188 [][c0000000d8307dc0] [c000000000015ba8]
0xc000000000015ba8 : .ppc32_select+0x14/0x28 [][c0000000d8307e30]
[c00000000000871c] 0xc00000000000871c : syscall_exit+0x0/0x40 []--- Exception:
c01 at 0x7a9b704

... and so on.

On i386, each stack entry is printed on a separate line.

-- 
           Summary: print_backtrace() prints most of stack on a single line
                    on ppc64
           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=3051

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