Hi all,
I tryed to drop a forkbomb into a uml.
The host system is a Debian testing(lenny) with a vanilla kernel 2.6.20,
the latest skas patch for that kernel and sarge guest fs with 2.6.18
shipped with debian stable(etch).
As far as I could try I launched 3 uml's I logd via ssh to root and :(){
:|:&};:
after some times( between 20 and 40 seconds of forks error I've see the
forks procesess terminating and the terminal of that guest up again,
I have no limits setted on the host nor into the uml, maybe someone have
an explanation :).
For who can be interested this is tail -f /var/log/kern.log of the guest,
nothing on the host:
May 9 09:50:35 vm01 kernel: BUG: warning at
kernel/rtmutex-debug.c:126/rt_mutex_debug_task_free()
May 9 09:50:35 vm01 kernel: 0b997b6c: [<0806cdbc>] dump_stack+0x4c/0x5e
May 9 09:50:35 vm01 kernel: 0b997b84: [<080fd242>]
rt_mutex_debug_task_free+0xaa/0x124
May 9 09:50:35 vm01 kernel: 0b997ba0: [<080b3771>] free_task+0x36/0x66
May 9 09:50:35 vm01 kernel: 0b997bb4: [<080b847b>]
copy_process+0x2a06/0x2a54
May 9 09:50:35 vm01 kernel: 0b997be0: [<080b87bb>] do_fork+0x1eb/0x52f
May 9 09:50:35 vm01 kernel: 0b997c3c: [<080ab285>] sys_clone+0xca/0x108
May 9 09:50:35 vm01 kernel: 0b997c64: [<080713a3>]
handle_syscall+0xd7/0x10e
May 9 09:50:35 vm01 kernel: 0b997cb4: [<080a5b74>] userspace+0x446/0x557
May 9 09:50:35 vm01 kernel: 0b997cfc: [<08070cee>] fork_handler+0x1ec/0x202
May 9 09:50:35 vm01 kernel: 0b997d1c: [<08470098>] __restore+0x0/0x8
Is this some real bug or just as result of the forkbomb?
Ciao
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