Re: 2.5.50 hang when copying files, handwritten trace included

[Andrew Morton]

Helge Hafting wrote:
> 
> 2.5.50 hung when copying 800M.
> mke2fs on a 10G partition, then try to copy
> the entire /home there. Source and destionation
> was on the same disk. After a while, this happened:
> 
> EIP: wake_up_forked_process+0xb8/0x18c
> EAX: 5a5a5a5a   (suspicious)
> 
> trace:
> do_fork
> kernel_thread
> pdflush
> kernel_thread_helper
> start_one_pdflush_thread
> pdflush
> __pdflush
> __pdflush
> background_writeout
> kernel_thread_helper
> 

Yes please - if you could gather sufficient info to enable
us to determine what eax is pointing at in wake_up_forked_process(),
that would help.  Presumably it's the new process, which is rather
bizarre.

Also, does disabling preemption make it stop?

Thanks.