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. A fix of this bug would be highly appreciated! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/879334 Title: nfsd from nfs-kernel-server very slow and system load from 25%-100% from nfsd To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/879334/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
