On Sat, Jul 19, 2014 at 12:50 AM, Toralf Förster <toralf.foerster@xxxxxx> wrote:
> On 07/18/2014 06:22 PM, Toralf Förster wrote:
>> I can now try with kzalloc, but due to the nature of this issue I think, that the absence of this crash - even after 2-3 hours - doesn't mean by 100%, that kzalloc fixed it, or ?
>
> Well, next crash (with kzalloc patch) happened after 20 minutes ...
Maybe I have found the problem.
The stateid and denied are defined as an union as,
fs/nfsd/xdr4.h
145 struct nfsd4_lock_denied {
146 clientid_t ld_clientid;
147 struct xdr_netobj ld_owner;
148 u64 ld_start;
149 u64 ld_length;
150 u32 ld_type;
151 };
152
153 struct nfsd4_lock {
... ...
174 /* response */
175 union {
176 struct {
177 stateid_t stateid;
178 } ok;
179 struct nfsd4_lock_denied denied;
180 } u;
30 struct xdr_netobj {
31 unsigned int len;
32 u8 * data;
33 };
sizeof(stateid_t) = 16, sizeof(clientid_t) = 8,
sizeof(struct xdr_netobj) = 16, (on x86_x64 platform),
sizeof(struct xdr_netobj) = 8, (on i686 platform)
Lock file success, nfsd will copy stateid to the union, but the value
also influence denied.
If on x86_64 platform, only influence the len in xdr_netobj,
but on i686 platform, will influence the len and the data in xdr_netobj.
So, the problem only appears on i686 platform.
thanks,
Kinglong Mee
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