Hi Dave,

Thanks for your answer.
I did'nt notice that "dis" was a crash command and "disas" a gdb command.
BTW, the "dis" command works fine.
crash> dis rpc_execute
0xa000000207d351e0 <rpc_execute>:       [MMI]       nop.m 0x0;;
0xa000000207d351e1 <rpc_execute+1>:                 alloc r34=ar.pfs,5,4,0
0xa000000207d351e2 <rpc_execute+2>:                 mov r33=b0

Thanks

Dave Anderson wrote:
xb wrote:
Hi Dave and all

I still have some problems with module symbols on ia64. (I built crash 4.0-3.17 + 4.0-3.17-to-4.0-3.18.patch).

BTW, I just put the "4.0-3.17-to-4.0-3.18.patch" there as a reference.
I'd still download and build the whole new package.
 

It seems that when I run the commans:

mod -s <module name>

the text symbol addresses are not the ones provided by kallsyms.
Any idea ?
Thanks in advance.
Xavier
 

No I don't off-hand.  But I never use the gdb "disas[semble]" command like
you are doing.

What happens when you use the crash "dis" command?  It uses
the gdb "x/<count>i <virtual-address>" construct behind the scenes,
and thereby prevents gdb from having to handle the symbol.  You can
pass "dis" either a symbol or a virtual address, so you could pick the
"rpc_execute" address of your choice.

Dave
 

 
Traces -------------------------------------------------------------------------------------------------------------------------------------
# ./crash /boot/vmlinux-2.6.18-B64k.1.7

crash 4.0-3.17
Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007  Red Hat, Inc.
...
GNU gdb 6.1
...
This GDB was configured as "ia64-unknown-linux-gnu"...

      KERNEL: /boot/vmlinux-2.6.18-B64k.1.7
    DUMPFILE: /dev/mem
        CPUS: 8
        DATE: Fri Feb  2 10:25:27 2007
      UPTIME: 13 days, 16:26:51
LOAD AVERAGE: 0.75, 0.66, 0.58
       TASKS: 286
    NODENAME: xxx
     RELEASE: 2.6.18-B64k.1.7
     VERSION: #1 SMP Fri Jan 5 14:05:06 CET 2007
     MACHINE: ia64  (1599 Mhz)
      MEMORY: 63.9 GB
         PID: 17276
     COMMAND: "crash"
        TASK: e000002025600000  [THREAD_INFO: e000002025600f40]
         CPU: 7
       STATE: TASK_RUNNING (ACTIVE)

crash> sym -l |grep rpc_execute
a000000207d34a80 (t) __rpc_execute
a000000207d351e0 (t) rpc_execute
a000000207d5a590 (?) rpc_execute
a000000207d5bde0 (r) __ksymtab_rpc_execute
a000000207d5c6d0 (r) __kstrtab_rpc_execute
a000000207d5cab0 (r) __kcrctab_rpc_execute
crash> disas rpc_execute
No symbol "rpc_execute" in current context.
crash> mod -s sunrpc
     MODULE       NAME                  SIZE  OBJECT FILE
a000000207d82280  sunrpc              414976  /lib/modules/2.6.18-B64k.1.7/kernel/net/sunrpc/sunrpc.ko
crash> disas rpc_execute
Dump of assembler code for function rpc_execute:
0xa000000207d5ac10 <rpc_execute+0>:     [MII]       break.m 0x0
0xa000000207d5ac11 <rpc_execute+1>:                 break.i 0x0
0xa000000207d5ac12 <rpc_execute+2>:                 break.i 0x0
...
End of assembler dump.
crash> disas 0xa000000207d351e0 0xa000000207d35200                         # This one is OK
Dump of assembler code from 0xa000000207d351e0 to 0xa000000207d35200:
0xa000000207d351e0:     [MMI]       nop.m 0x0;;
0xa000000207d351e1:                 alloc r34=ar.pfs,5,4,0
0xa000000207d351e2:                 mov r33=b0
0xa000000207d351f0:     [MMI]       nop.m 0x0
0xa000000207d351f1:                 mov r35=r1
0xa000000207d351f2:                 adds r17=208,r32;;
End of assembler dump.
crash>

Dave Anderson wrote:

- Enhancement to the "mod" command to expand the number of section
  arguments to the internal "add-symbol-file" command issued to gdb to
  load the debug data for module objects.  On most architectures,  this
  allows the usage of the command construct "p [module-symbol-name]" to
  print out the module data structure in the same way that is done for
  kernel proper data structure names.  (castor.fu@3pardata.com)

- Two enhancements to significantly speed up the initialization of
  crash sessions when running against multi-gigabyte xen kernels or
  xendumps.  The cache of mfn-to-phys_to_machine_mapping page has been
  changed from a single-mfn-to-phys_to_machine_mapping page format to
  storing a contiguous-range-of-mfns-to-phys_to_machine_mapping format.
  This benefit is primarily seen during the "gathering module symbol
  data" phase.  The second change simply increases the size of the
  pfn-to-xendump-page-offset cache.  (anderson@redhat.com)

- Fix for a segmentation violation during the "gathering task table
  data" phase of initialization if the thread_info structure of the
  runqueue-advertised active task has been freed.  This has only ever
  been seen in a xendump created by "xm dump-core -L [guest-domain]".
  (anderson@redhat.com)

- Cosmetic fix to prepend newlines to messages that happen to be
  generated during any of the "please wait" segments of initialization.
  (anderson@redhat.com)

- Addressed several compiler warnings when using -D_FORTIFY_SOURCE=2.
  Some are in gdb code that is never exercised, others were legitimate
  but would require impossible code paths, but one of them could
  result in runaway "help -t" output if the kernel was built without
  IKCONFIG.  (bwalle@suse.de)

- Fix for the s390x "bt -f" command option, which was displaying the
  stack as a sequence of 32-bit words which were dumped "backwards",
  i.e., at the wrong offset.  (krader@us.ibm.com)

- http://people.redhat.com/anderson/4.0-3.17-to-4.0-3.18.patch
 

Download from: http://people.redhat.com/anderson
 
 
 
  


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