Same here.
NFSv4 mounted home dirs (from a Ubuntu 12.04 LTS NFSv4 server) become very slow. Eventually the client machine freezes completely -> reset button.
Using Opensuse 12.2 as NFSv4 client produces no problems at all.
This is reproducable.
Same on some of our servers with NFSv4 mounted directories. All Ubuntu 12.04 LTS, NFSv4 servers and clients.
Frequent messages in /var/log/syslog:
[...]
Jan 25 11:49:39 xxx kernel: [ 8996.289241] Call Trace:
Jan 25 11:49:39 xxx kernel: [ 8996.289246] [<ffffffff81659ebf>] schedule+0x3f/0x60
Jan 25 11:49:39 xxx kernel: [ 8996.289249] [<ffffffff8165acc7>] __mutex_lock_slowpath+0xd7/0x150
Jan 25 11:49:39 xxx kernel: [ 8996.289253] [<ffffffff8165a8da>] mutex_lock+0x2a/0x50
Jan 25 11:49:39 xxx kernel: [ 8996.289256] [<ffffffff81186404>] do_last+0x2b4/0x730
Jan 25 11:49:39 xxx kernel: [ 8996.289260] [<ffffffff81187c21>] path_openat+0xd1/0x3f0
Jan 25 11:49:39 xxx kernel: [ 8996.289263] [<ffffffff81183565>] ? putname+0x35/0x50
Jan 25 11:49:39 xxx kernel: [ 8996.289266] [<ffffffff81187fc3>] ? user_path_at_empty+0x63/0xa0
Jan 25 11:49:39 xxx kernel: [ 8996.289275] [<ffffffffa01337db>] ? nfs_attribute_cache_expired+0x1b/0x70 [nfs]
Jan 25 11:49:39 xxx kernel: [ 8996.289279] [<ffffffff81188062>] do_filp_open+0x42/0xa0
Jan 25 11:49:39 xxx kernel: [ 8996.289284] [<ffffffff81319c11>] ? strncpy_from_user+0x31/0x40
Jan 25 11:49:39 xxx kernel: [ 8996.289287] [<ffffffff811833aa>] ? do_getname+0x10a/0x180
Jan 25 11:49:39 xxx kernel: [ 8996.289291] [<ffffffff8165bdce>] ? _raw_spin_lock+0xe/0x20
Jan 25 11:49:39 xxx kernel: [ 8996.289294] [<ffffffff81195377>] ? alloc_fd+0xf7/0x150
Jan 25 11:49:39 xxx kernel: [ 8996.289298] [<ffffffff81177688>] do_sys_open+0xf8/0x240
Jan 25 11:49:39 xxx kernel: [ 8996.289301] [<ffffffff811777f0>] sys_open+0x20/0x30
Jan 25 11:49:39 xxx kernel: [ 8996.289304] [<ffffffff816643c2>] system_call_fastpath+0x16/0x1b
[...]
Eventually the servers which act as NFS clients freeze completely -> remote reset. (It's just a test system).
This is reproducable.
Needless to say, that this disqualifies Ubuntu 12.04 LTS as an NFS client.
Same here.
NFSv4 mounted home dirs (from a Ubuntu 12.04 LTS NFSv4 server) become very slow. Eventually the client machine freezes completely -> reset button.
Using Opensuse 12.2 as NFSv4 client produces no problems at all.
This is reproducable.
Same on some of our servers with NFSv4 mounted directories. All Ubuntu 12.04 LTS, NFSv4 servers and clients. ebf>] schedule+0x3f/0x60 cc7>] __mutex_ lock_slowpath+ 0xd7/0x150 8da>] mutex_lock+ 0x2a/0x50 404>] do_last+0x2b4/0x730 c21>] path_openat+ 0xd1/0x3f0 565>] ? putname+0x35/0x50 fc3>] ? user_path_ at_empty+ 0x63/0xa0 7db>] ? nfs_attribute_ cache_expired+ 0x1b/0x70 [nfs] 062>] do_filp_ open+0x42/ 0xa0 c11>] ? strncpy_ from_user+ 0x31/0x40 3aa>] ? do_getname+ 0x10a/0x180 dce>] ? _raw_spin_ lock+0xe/ 0x20 377>] ? alloc_fd+0xf7/0x150 688>] do_sys_ open+0xf8/ 0x240 7f0>] sys_open+0x20/0x30 3c2>] system_ call_fastpath+ 0x16/0x1b
Frequent messages in /var/log/syslog:
[...]
Jan 25 11:49:39 xxx kernel: [ 8996.289241] Call Trace:
Jan 25 11:49:39 xxx kernel: [ 8996.289246] [<ffffffff81659
Jan 25 11:49:39 xxx kernel: [ 8996.289249] [<ffffffff8165a
Jan 25 11:49:39 xxx kernel: [ 8996.289253] [<ffffffff8165a
Jan 25 11:49:39 xxx kernel: [ 8996.289256] [<ffffffff81186
Jan 25 11:49:39 xxx kernel: [ 8996.289260] [<ffffffff81187
Jan 25 11:49:39 xxx kernel: [ 8996.289263] [<ffffffff81183
Jan 25 11:49:39 xxx kernel: [ 8996.289266] [<ffffffff81187
Jan 25 11:49:39 xxx kernel: [ 8996.289275] [<ffffffffa0133
Jan 25 11:49:39 xxx kernel: [ 8996.289279] [<ffffffff81188
Jan 25 11:49:39 xxx kernel: [ 8996.289284] [<ffffffff81319
Jan 25 11:49:39 xxx kernel: [ 8996.289287] [<ffffffff81183
Jan 25 11:49:39 xxx kernel: [ 8996.289291] [<ffffffff8165b
Jan 25 11:49:39 xxx kernel: [ 8996.289294] [<ffffffff81195
Jan 25 11:49:39 xxx kernel: [ 8996.289298] [<ffffffff81177
Jan 25 11:49:39 xxx kernel: [ 8996.289301] [<ffffffff81177
Jan 25 11:49:39 xxx kernel: [ 8996.289304] [<ffffffff81664
[...]
Eventually the servers which act as NFS clients freeze completely -> remote reset. (It's just a test system).
This is reproducable.
Needless to say, that this disqualifies Ubuntu 12.04 LTS as an NFS client.
A fix of this bug would be highly appreciated!