Re: search -k

hi,

i run crash with gdb.

[rootrhel51rc2 crash-4.0-6.1]# gdb ./crash
GNU gdb Red Hat Linux (6.5-25.el5rh)
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public
License, and you are
welcome to change it and/or distribute copies of it under
certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show
warranty" for details.
This GDB was configured as
"ia64-redhat-linux-gnu"...Using host libthread_db
library "/lib/libthread_db.so.1".

(gdb) b search
Breakpoint 1 at 0x40000000000f8e11: file memory.c, line
11025.
(gdb) r -s
Starting program: /home/yangzg/crash-4.0-6.1/crash -s
crash> search -k 12345

Breakpoint 1, search (start=11529215046068469760,
end=18446744073709551615, mask=0, memtype=1,
value=0x60000fffffe3eab0, vcnt=1) at memory.c:11025
11025           if (start & (sizeof(long)-1)) {
(gdb) n
11030           pagebuf = GETBUF(PAGESIZE());
(gdb)
11031           next = start;
(gdb)
11033           for (pp = VIRTPAGEBASE(start); next <
end; next = pp) {
(gdb)
11034                   lastpage = (VIRTPAGEBASE(next) ==
VIRTPAGEBASE(end));
(gdb)
11035                   if (LKCD_DUMPFILE())
(gdb)
11038                   switch (memtype)
(gdb)
11050                           if
(!kvtop(CURRENT_CONTEXT(), pp, &paddr, 0) ||
(gdb) s
kvtop (tc=0x6000000001ec1c50, kvaddr=11529215046068469760,
paddr=0x60000fffffe368e8, verbose=0) at memory.c:2306
2306            return (machdep->kvtop(tc ? tc :
CURRENT_CONTEXT(), kvaddr,
(gdb) s
ia64_kvtop (tc=0x6000000001ec1c50,
kvaddr=11529215046068469760, paddr=0x60000fffffe368e8,
verbose=0) at ia64.c:1031
1031            if (!IS_KVADDR(kvaddr))
(gdb) n
1034            if (!vt->vmalloc_start) {
(gdb)
1039            switch (VADDR_REGION(kvaddr))
(gdb)
1054                    if (ia64_IS_VMALLOC_ADDR(kvaddr))
(gdb)
1056                    *paddr = ia64_VTOP(kvaddr);
(gdb) s
ia64_VTOP (vaddr=11529215046068469760) at ia64.c:3501
3501            ms = &ia64_machine_specific;
(gdb) n
3503            switch (VADDR_REGION(vaddr))
(gdb)
3522                    if (ia64_IS_VMALLOC_ADDR(vaddr) ||
(gdb)
3531                    paddr = vaddr - ms->kernel_start
+
(gdb)
3533                    break;
(gdb) p/x paddr
$1 = 0xffffffff04000000                   ======>error
occured
(gdb) p/x vaddr
$2 = 0xa000000000000000
(gdb) p/x ms->kernel_start
$3 = 0xa000000100000000
(gdb) p/x ms->phys_start
$4 = 0x4000000
(gdb)

Best Regards,
yang

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Yang Zhiguo wrote:
> hi,
> 
> i run crash with gdb.
> 
> [rootrhel51rc2 crash-4.0-6.1]# gdb ./crash
> GNU gdb Red Hat Linux (6.5-25.el5rh)
> Copyright (C) 2006 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public
License, and you are
> welcome to change it and/or distribute copies of it
under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type
"show warranty" for details.
> This GDB was configured as
"ia64-redhat-linux-gnu"...Using host libthread_db
library "/lib/libthread_db.so.1".
> 
> (gdb) b search
> Breakpoint 1 at 0x40000000000f8e11: file memory.c, line
11025.
> (gdb) r -s
> Starting program: /home/yangzg/crash-4.0-6.1/crash -s
> crash> search -k 12345
> 
> Breakpoint 1, search (start=11529215046068469760,
end=18446744073709551615, mask=0, memtype=1,
value=0x60000fffffe3eab0, vcnt=1) at memory.c:11025
> 11025           if (start & (sizeof(long)-1)) {
> (gdb) n
> 11030           pagebuf = GETBUF(PAGESIZE());
> (gdb)
> 11031           next = start;
> (gdb)
> 11033           for (pp = VIRTPAGEBASE(start); next
< end; next = pp) {
> (gdb)
> 11034                   lastpage = (VIRTPAGEBASE(next)
== VIRTPAGEBASE(end));
> (gdb)
> 11035                   if (LKCD_DUMPFILE())
> (gdb)
> 11038                   switch (memtype)
> (gdb)
> 11050                           if
(!kvtop(CURRENT_CONTEXT(), pp, &paddr, 0) ||
> (gdb) s
> kvtop (tc=0x6000000001ec1c50,
kvaddr=11529215046068469760, paddr=0x60000fffffe368e8,
verbose=0) at memory.c:2306
> 2306            return (machdep->kvtop(tc ? tc :
CURRENT_CONTEXT(), kvaddr,
> (gdb) s
> ia64_kvtop (tc=0x6000000001ec1c50,
kvaddr=11529215046068469760, paddr=0x60000fffffe368e8,
verbose=0) at ia64.c:1031
> 1031            if (!IS_KVADDR(kvaddr))
> (gdb) n
> 1034            if (!vt->vmalloc_start) {
> (gdb)
> 1039            switch (VADDR_REGION(kvaddr))
> (gdb)
> 1054                    if
(ia64_IS_VMALLOC_ADDR(kvaddr))
> (gdb)
> 1056                    *paddr = ia64_VTOP(kvaddr);
> (gdb) s
> ia64_VTOP (vaddr=11529215046068469760) at ia64.c:3501
> 3501            ms = &ia64_machine_specific;
> (gdb) n
> 3503            switch (VADDR_REGION(vaddr))
> (gdb)
> 3522                    if (ia64_IS_VMALLOC_ADDR(vaddr)
||
> (gdb)
> 3531                    paddr = vaddr -
ms->kernel_start +
> (gdb)
> 3533                    break;
> (gdb) p/x paddr
> $1 = 0xffffffff04000000                  
======>error occured
> (gdb) p/x vaddr
> $2 = 0xa000000000000000
> (gdb) p/x ms->kernel_start
> $3 = 0xa000000100000000
> (gdb) p/x ms->phys_start
> $4 = 0x4000000
> (gdb)
> 
> Best Regards,
> yang

I can reproduce it on a bare-metal RHEL5 kernel, so let me
figure out what's going on...

Thanks,
   Dave


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