[stgt] tgtd crash when adding more than ~20 targets (and a way to reproduce)

[Ming Zhang]

On Thu, 2008-09-25 at 16:34 +0200, Tomasz Chmielewski wrote:
> Tomasz Chmielewski schrieb:
> > tgtd will crash with more than ~20 targets.
> > 
> > To reproduce, start this bash script:
> > 
> > #!/bin/bash
> > 
> > i=1
> > 
> > while [ $i -ne 1024 ] ; do
> >    echo tgtadm --lld iscsi --op new --mode target --tid 1$i -T 
> > iqn.2007-02.com.example:test.break$i
> >    tgtadm --lld iscsi --op new --mode target --tid 1$i -T 
> > iqn.2007-02.com.example:test.break$i
> >    echo tgtadm --lld iscsi --op new --mode logicalunit --tid 1$i --lun 1 
> > -b /dev/sda
> >    tgtadm --lld iscsi --op new --mode logicalunit --tid 1$i --lun 1 -b 
> > /dev/sda
> >    [ $? -ne 0 ] && exit
> >    i=$((i+1))
> > done
> 
> At least, it crashes on 32 bit.
> 
> BTW, this is quite strange, as I have one machine (x86_64) with 51 targets:
> 
> # tgtadm --op show --mode target | grep -c Target
> 51
> 
> Perhaps running an older tgt revision? Or 64 bit makes a difference 
> here? I have no way to check if there is any limit on 64 bit right now.

32bit only have limited memory space for mmap. each pthread consumes
~10MB by default. so 64bit really make a difference here. 

this is a pthread implementation limitation.




> 
> It also crashes when tgtd is started in the foreground.
> 
> 

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