Freeze in GC_suspend_handler

[Daniel Bonniot]

>
>
>It looks as though it's hanging up in the garbage collector waiting on
>a spin lock.  The interesting question is whether or not some other
>thread has the lock, and if so why it isn't releasing it.
>
How can I investigate that?

>What CPU is this?
>
$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 6
model name      : Celeron (Mendocino)
stepping        : 5
cpu MHz         : 487.507
cache size      : 128 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge 
mca cmov pat pse36 mmx fxsr
bogomips        : 973.20