[Bug kprobes/2726] systemtap.base/probefunc.exp crash in kernel/module.c:2114 on RHEL4

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

------- Additional Comments From wcohen at redhat dot com  2006-06-12 18:21 -------
The following probe caused the -39 kernel and the current snapshot (20060612)
systemtap to crash the system. It looks like there needs to be some load for
things to crash:

#!/bin/stap

probe kernel.function("scheduler_tick")
{
        printf("%s: %s (%d)\n", execname(), probefunc(), pid())
}

The tail end of the output from the instrumentation:

swapper: scheduler_tick (0)
login: scheduler_tick (4159)
swapper: scheduler_tick (0)
bash: scheduler_tick (4159)
bash: scheduler_tick (4159)
bash: scheduler_tick (4160)
id: scheduler_tick (4161)
bash: scheduler_tick (4160)
bash: scheduler_tick (4163)
swapper: scheduler_tick (0)
egrep: scheduler_tick (4163)
bash: scheduler_tick (4164)
egrep: scheduler_tick (4165)
egrep: scheduler_tick (4165)
bash: scheduler_tick (4167)
egrep: scheduler_tick (4167)
bash: scheduler_tick (4168)
egrep: scheduler_tick (4169)
bash: scheduler_tick (4170)
id: scheduler_tick (4171)
bash: scheduler_tick (4159)
hostname: scheduler_tick (4173)
bash: scheduler_tick (4159)


I got the following output on the console:


Kernel panic - not syncing: kernel/module.c:2114
Kernel panic - not syncing: kernel/module.c:2114: spin_lock(kernel/module.c:c034
Kernel panic - not syncing: kernel/module.c:2114: spin_lock(kernel/module.c:c034
Kernel panic - not syncing: kernel/module.c:2114: spin_lock(kernel/module.c:c034
Kernel panic - not syncing: kernel/module.c:2114: spin_lock(kernel/module.c:c034
Kernel panic - not syncing: kernel/module.c:2114: spin_lock(kernel/module.c:c034
Kernel panic - not syncing: kernel/module.c:2114: spin_lock(kernel/module.c:c034
Kernel panic - not syncing: kernel/module.c:2114: spin_lock(kernel/module.c:c034
Kernel panic - not syncing: kernel/module.c:2114: spin_lock(kernel/module.c:c034
Kernel panic - not syncing: kernel/module.c:2114: spin_lock(kernel/module.c:c034

Details about the system:

$ more /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 6
model name      : AMD Athlon(TM) XP 2000+
stepping        : 2
cpu MHz         : 1687.684
cache size      : 256 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat
pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow
bogomips        : 3377.23

$ free
             total       used       free     shared    buffers     cached
Mem:        515612     129772     385840          0      25868      48924
-/+ buffers/cache:      54980     460632
Swap:      1020116          0    1020116


-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=2726

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