[Bug runtime/2725] Attempting to probe all kernel functions hangs FC5

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

------- Additional Comments From ldimaggi at redhat dot com  2006-06-02 15:33 -------
Thanks for all the suggestions feedback - I need to narrow this down - some more
notes, answers to questions...

Architecture = i386, T41 thinkpad (1GB RAM), 
Linux dhcp83-56.boston.redhat.com 2.6.16-1.2122_FC5 #1 Sun May 21 15:01:01 EDT
2006 i686 i686 i386 GNU/Linux

It's a limit problem - 10K+ probes are being set:
------------
static char const * dwarf_kprobe_probe_613_location_names[10481] = {
  "kernel.function(\"run_init_process@init/main.c:666\")",
  "kernel.function(\"init@init/main.c:690\")",
  "kernel.function(\"rest_init@init/main.c:389\")",
------------

stap_2615.ko is large too:
------------
[root@dhcp83-56 stap0bMFBZ]# ll
total 6552
-rw-r--r-- 1 root root     127 Jun  2 11:05 Makefile
-rw-r--r-- 1 root root 1066809 Jun  2 11:05 stap_2615.c
-rw-r--r-- 1 root root 2188299 Jun  2 11:05 stap_2615.ko
-rw-r--r-- 1 root root    1929 Jun  2 11:05 stap_2615.mod.c
-rw-r--r-- 1 root root   34008 Jun  2 11:05 stap_2615.mod.o
-rw-r--r-- 1 root root 2155316 Jun  2 11:05 stap_2615.o
-rw-r--r-- 1 root root  692476 Jun  2 11:05 stap-symbols.h
-rw-r--r-- 1 root root  492534 Jun  2 11:05 symbols.sorted
------------

This script reliably hangs - or even reboots the system:
------------
#!/usr/bin/env stap 
probe begin { 
  log("begin") 
}
probe end { 
  log("end") 
}
probe kernel.function("*") {
}
------------

Nothing interesting is being written to /var/messages

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=2725

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