Messages in this thread Patch in this message | | | Date | Sat, 4 Sep 2010 11:07:43 -0400 (EDT) | From | caiqian@redhat ... | Subject | Re: crash failure with 2.6.36-rc3 vmcore |
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Sorry for the confusion. Here is some background. The test here was to use the crash utility to analyse a vmcore generated from kdump. This commit caused its subcommand mod -S failed to gather the module section data from the in-kernel data structure as it looks like it still depends on this field. I am not sure if that the crash utility just need to be adjusted to cope with this kernel change.
From http://people.redhat.com/anderson/crash_sources/symbols.c /* * Gather the module section data from the in-kernel data structures. */ static int add_symbol_file_kallsyms(struct load_module *lm, struct gnu_request *req) { int len, buflen, done, nsections, retval; ulong vaddr, array_entry, attribute, owner, name, address; long name_type; char buf[BUFSIZE]; char section_name[BUFSIZE]; ulong section_vaddr;
if (!(st->flags & (MODSECT_V1|MODSECT_V2|MODSECT_V3|MODSECT_UNKNOWN))) { STRUCT_SIZE_INIT(module_sect_attr, "module_sect_attr"); MEMBER_OFFSET_INIT(module_sect_attrs, "module", "sect_attrs"); MEMBER_OFFSET_INIT(module_sect_attrs_attrs, "module_sect_attrs", "attrs"); MEMBER_OFFSET_INIT(module_sect_attrs_nsections, "module_sect_attrs", "nsections"); MEMBER_OFFSET_INIT(module_sect_attr_mattr, "module_sect_attr", "mattr"); MEMBER_OFFSET_INIT(module_sect_attr_name, "module_sect_attr", "name"); MEMBER_OFFSET_INIT(module_sect_attr_address, "module_sect_attr", "address"); MEMBER_OFFSET_INIT(module_attribute_attr, "module_attribute", "attr"); MEMBER_OFFSET_INIT(module_sect_attr_attr, "module_sect_attr", "attr"); MEMBER_OFFSET_INIT(module_sections_attrs, "module_sections", "attrs"); MEMBER_OFFSET_INIT(attribute_owner, "attribute", "owner"); ... owner = attribute + OFFSET(attribute_owner);
----- "Guenter Roeck" <guenter.roeck@ericsson.com> wrote:
> Hi, > > On Sat, Sep 04, 2010 at 02:01:06AM -0400, CAI Qian wrote: > > > > > crash> mod -S > > > > > > mod: invalid structure member offset: attribute_owner > > > FILE: symbols.c LINE: 8577 FUNCTION: > add_symbol_file_kallsyms() > > > > > > MODULE NAME SIZE OBJECT FILE > > > ffffffffa000de60 dm_mod 76230 > > > > /lib/modules/2.6.36-rc2-mm1-wqfix-mkdfix+/kernel/drivers/md/dm-mod.ko > > > [/usr/bin/crash] error trace: 4affb0 => 4f3236 => 4f12b5 => > 4e587a > > > > > > 4e587a: OFFSET_verify.clone.4+186 > > > 4f12b5: add_symbol_file+933 > > > 4f3236: load_module_symbols+566 > > > 4affb0: do_module_cmd+1264 > > > > > > mod: invalid structure member offset: attribute_owner > > > FILE: symbols.c LINE: 8577 FUNCTION: > add_symbol_file_kallsyms() > > What do I have to do to reproduce this crash ? > > Was the module in question compiled w/ the kernel, or separately ? > Did it use the correct kernel header files for compilation ? > Was the kernel version -rc3, or some other patched version ? > > Just wondering, since the above message says > 2.6.36-rc2-mm1-wqfix-mkdfix+, > which seems to indicate that it included some modifications. > > Thanks, > Guenter > > > This failure was due to this commit, > > > > commit 6fd69dc578fa0b1bbc3aad70ae3af9a137211707 > > Author: Guenter Roeck <guenter.roeck@ericsson.com> > > Date: Wed Jul 28 22:09:26 2010 -0700 > > > > sysfs: Remove owner field from sysfs struct attribute > > > > Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> > > Acked-by: Tejun Heo <tj@kernel.org> > > Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> > > > > diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h > > index 8bf06b6..3c92121 100644 > > --- a/include/linux/sysfs.h > > +++ b/include/linux/sysfs.h > > @@ -22,14 +22,8 @@ struct kobject; > > struct module; > > enum kobj_ns_type; > > > > -/* FIXME > > - * The *owner field is no longer used. > > - * x86 tree has been cleaned up. The owner > > - * attribute is still left for other arches. > > - */ > > struct attribute { > > const char *name; > > - struct module *owner; > > mode_t mode; > > #ifdef CONFIG_DEBUG_LOCK_ALLOC > > struct lock_class_key *key;
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