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List:       user-mode-linux-user
Subject:    Re: [uml-user] iomem problems
From:       Papa Thambi <uml_linux () yahoo ! com>
Date:       2003-09-25 14:18:40
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Greg,

   Are you running it in skas mode or tt mode? 

Here is the trace...( I am just trying to run the
mmapper code).


(gdb) bt
#0  panic (fmt=0xa01c5afd "Segfault with no mm") at
panic.c:54
#1  0xa00e539f in segv (address=4, ip=2685256144,
is_write=0, is_user=0, 
    sc=0xa05ac274) at trap_kern.c:100
#2  0xa00e588c in segv_handler (sig=11,
regs=0xa05ac274) at trap_user.c:69
#3  0xa00e8eb7 in sig_handler_common_tt (sig=11,
sc_ptr=0xa05af780)
    at trap_user.c:37
#4  0xa00e58d0 in sig_handler (sig=11, sc=
      {gs = 0, __gsh = 0, fs = 0, __fsh = 0, es = 43,
__esh = 0, ds = 43, __dsh = 0, edi = 0, esi = 4096,
ebp = 2690316908, esp = 2690316884, ebx = 4294967295,
edx = 0, ecx = 0, eax = 0, trapno = 14, err = 4, eip =
2685256144, cs = 35, __csh = 0, eflags = 66118,
esp_at_signal = 2690316884, ss = 43, __ssh = 0,
fpstate = 0x0, oldmask = 134283264, cr2 = 4}) at
trap_user.c:103
#5  <signal handler called>
#6  pfn_to_page (pfn=4294967295) at mem.c:768
#7  0xa00310fe in zap_page_range (mm=0xa19b1620,
address=1073840128, size=4096)
    at memory.c:317
#8  0xa0033a87 in exit_mmap (mm=0xa19b1620) at
mmap.c:1151
#9  0xa0010288 in mmput (mm=0xa19b1620) at fork.c:284
#10 0xa00195a4 in do_exit (code=0) at exit.c:318
#11 0xa00e7db8 in execute_syscall_tt (r=0xa05ac274) at
syscall_kern.c:120
#12 0xa00e7e65 in syscall_handler_tt (sig=12,
regs=0xa05ac274)
    at syscall_user.c:37
#13 0xa00e8eb7 in sig_handler_common_tt (sig=12,
sc_ptr=0xa05afd28)
---Type <return> to continue, or q <return> to quit---

    at trap_user.c:37
#14 0xa00e58d0 in sig_handler (sig=12, sc=
      {gs = 0, __gsh = 0, fs = 0, __fsh = 0, es = 43,
__esh = 0, ds = 43, __dsh = 0, edi = 0, esi =
1075128384, ebp = 2684353384, esp = 2684353340, ebx =
0, edx = 1075132084, ecx = 4096, eax = 4294967258,
trapno = 1, err = 0, eip = 1074626877, cs = 35, __csh
= 0, eflags = 582, esp_at_signal = 2684353340, ss =
43, __ssh = 0, fpstate = 0xa05afd80, oldmask =
503390208, cr2 = 1074626864})
    at trap_user.c:103
#15 <signal handler called>
#16 0x400d813d in ?? ()
#17 0x40039630 in ?? ()
(gdb) 

Thanks,
Papa

--- Greg Lonnon <greg@lonnon.org> wrote:
> I don't believe upgrading the host will help, but it
> might be some good
> information.  I have been using iomem for a while
> with rh9 and uml
> 2.4.20-um5 without a problem.  
> 
> If you provide a stack trace, someone might be able
> to help.
> 
> Greg
> 
> On Wed, 2003-09-24 at 09:53, Papa Thambi wrote:
> > Hi,
> > 
> >    iomem feature seems to be flaky from 2.4.19
> > onwards.Most of the time UML crashes with no mm
> fault.
> > I am running 2.4.18 host. Do you think if I
> upgrade
> > the host to 2.4.22 will help?
> > 
> > Regards..
> > 
> > 
> > __________________________________
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> -- 
> Greg Lonnon <greg@lonnon.org>
> 


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