Re: [coLinux-devel] FWD: Kernel 2.6.11-co-0.6.3-pre7 panics while building xorg-x11-6.8.0

[Henry N. <Henry.Ne@Arcor.de>]

Henry Nestler wrote:

> Henry Nestler wrote:
[...]
> 
> Have also this oops now :-( comes by simply use Xdeep32 with one xterm
> active, and mc (Midnight Commander) in putty session. System was idle 
> before trap. It's a SuSE 9.0 distribution on partion (dual boot).
> 
> I save complete trap and disassemble with ksymoops. See attached files!
> I locking arround this oops and find a way for this.
> 
> 1) Struc signal_struct have new field "rlim" in kernel 2.6.10. Kernel
> 2.6.8.11 has not "rlim". All function between do_timer_interrupt to
> account_user_time are new in kernel 2.6.10 (update_process_times,
> do_timer_interrupt_hook).
> 
> 2) The call of account_user_time is depend on Flag VM_MASK. If I
> understand all, this flag is only enabled, if a vm86 function is called,
> such DOSEMU or svgalib. I use not such programs.
> 
> 3) account_user_time is also called, if register CS mask with 3 is not
> zero (0 is kernel, all others is user). See include/asm-i386/ptrace.h
> #define user_mode(regs) \
>    ((VM_MASK & (regs)->eflags) || (3 & (regs)->xcs))
> 
> I don't know the state of these bits before the interrupt handler enter,
> but this calculation is the only one to count timer for user or system.
> 
> 4) I can not repair this, but I add some trace lines before this trap. 
> Perhaps any other user can also run this special binary and hope to have 
> the error again. Er error should printed on sys console and not crash 
> the kernel.
> 
> This error is very rarely. My colinux runs many hours (without patch), 
> I'm building some rpm's, using a lot of X aplications and recompile 
> colinux kernel, but no crash comes again.
> 

All in Date: 2005-03-12T11:19:07, not you last source of 2005-03-20!

-- 
Henry Nestler