[Bug runtime/11249] Tracking executable plus library fails on i386

["mjw at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From mjw at redhat dot com  2010-02-04 14:13 -------
So the simpler reproducer with just one probe is:

$ stap -DDEBUG_UPROBES -DDEBUG_TASK_FINDER -DEBUG_TASK_FINDER_VMA -e 'probe
process("/lib/libc.so.6").function("__getpagesize").call { log(pp()) }' -c /bin/ls

stap_start_task_finder:1552: attach count: 2, inuse count: 0
stap_uprobe_change_plus:67: +uprobe spec 0 idx 0 process stapio[1183] addr
0060b150 pp
process("/lib/libc.so.6").function("__getpagesize@../sysdeps/unix/sysv/linux/getpagesize.c:27").call
stap_uprobe_change_minus:220: -uprobe spec 0 idx 0 process ls[1183] reloc
0060b150 pp
process("/lib/libc.so.6").function("__getpagesize@../sysdeps/unix/sysv/linux/getpagesize.c:27").call
stap_uprobe_change_plus:67: +uprobe spec 0 idx 0 process ls[1183] addr 0508c150
pp
process("/lib/libc.so.6").function("__getpagesize@../sysdeps/unix/sysv/linux/getpagesize.c:27").call
process("/lib/libc.so.6").function("__getpagesize@../sysdeps/unix/sysv/linux/getpagesize.c:27").call
stap_uprobe_change_minus:220: -uprobe spec 0 idx 0 process ls[1183] reloc
0508c150 pp
process("/lib/libc.so.6").function("__getpagesize@../sysdeps/unix/sysv/linux/getpagesize.c:27").call
stap_stop_task_finder:1564: attach count: 0, inuse count: 0
stap_utrace_detach_ops:360: attach count: 0, inuse count: 0
stap_utrace_detach_ops:360: attach count: 0, inuse count: 0
stap_stop_task_finder:1567: attach count: 0, inuse count: 0
stap_stop_task_finder:1583: attach count: 0, inuse count: 0

dmesg tail:
stap_839: systemtap: 1.1/0.144, base: f7dd2000, memory:
34data/19text/2ctx/13net/17alloc kb, probes: 1
Task died at uprobe probepoint:  pid/tgid = 1183/1183, probepoint = 0x508c150

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http://sourceware.org/bugzilla/show_bug.cgi?id=11249

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