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Subject: NFSv4 blocking applications on NFS home
From: Matthias Jansen <mail@matthiasjansen.de>
To: linux-nfs@vger.kernel.org
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Date: Fri, 15 Mar 2013 14:00:15 +0100
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Dear all,

I already talked a little bit with Trond about my recent problems with
NFS. I just switched from NFSv3 to NFSv4 after a server update because
NFSv3 wasn't working correct any more (which seems to be fixed in the
meantime).

My kernel versions are:

Server: 3.8.2-gentoo
Workstation: 3.8.2-gentoo

After switching to NFSv4 (which I wanted for a longer time as it should
be faster etc.) at first I had some trouble with kernel oops on the
client. As Trond told me to get rid of the nvidia driver to have an oops
without taint I switched to nouveau and since then couldn't reproduce
the kernel oops. So it seems like it was nvidias fault or a combination
only triggered when the nvidia driver is loaded.

But even with the nouveau driver NFSv4 isn't working really good,
because I have lockups from time to time (randomly it seems) where most
of the programs become unresponsive (as my home-dir is a NFS share).

I checked with Magic SysRq + w and got the following examples:

Mar 15 10:16:17 workstation kernel: [ 7188.311533] SysRq : Show Blocked
State
Mar 15 10:16:17 workstation kernel: [ 7188.313476]   task
PC stack   pid father
Mar 15 10:16:17 workstation kernel: [ 7188.313520] mozStorage #4   D
ffff88041c7ddbc8     0  4349      1 0x00000000
Mar 15 10:16:17 workstation kernel: [ 7188.313525]  ffff88041c7dd910
0000000000000086 ffff88041d0b4d30 ffff8803f92e9fd8
Mar 15 10:16:17 workstation kernel: [ 7188.313529]  0000000000011200
0000000000004000 ffff88040d205234 ffff88042f44d040
Mar 15 10:16:17 workstation kernel: [ 7188.313533]  ffff88041c808140
ffff88041c96fa80 0000000000000000 0000000000000001
Mar 15 10:16:17 workstation kernel: [ 7188.313536] Call Trace:
Mar 15 10:16:17 workstation kernel: [ 7188.313546]
[<ffffffff81067b5b>] ? __queue_work+0x242/0x267
Mar 15 10:16:17 workstation kernel: [ 7188.313552]
[<ffffffff8147a9f1>] ? rpc_execute+0xe/0x22
Mar 15 10:16:17 workstation kernel: [ 7188.313557]
[<ffffffff814758d1>] ? rpc_run_task+0x6e/0x76
Mar 15 10:16:17 workstation kernel: [ 7188.313561]
[<ffffffff810a438e>] ? __lock_page+0x66/0x66
Mar 15 10:16:17 workstation kernel: [ 7188.313566]
[<ffffffff814a3482>] ? io_schedule+0x84/0xbf
Mar 15 10:16:17 workstation kernel: [ 7188.313569]
[<ffffffff810a4394>] ? sleep_on_page+0x6/0xa
Mar 15 10:16:17 workstation kernel: [ 7188.313572]
[<ffffffff814a1d19>] ? __wait_on_bit+0x3e/0x71
Mar 15 10:16:17 workstation kernel: [ 7188.313577]
[<ffffffff81077070>] ? set_next_entity+0x32/0x4e
Mar 15 10:16:17 workstation kernel: [ 7188.313581]
[<ffffffff810a4570>] ? wait_on_page_bit+0x6e/0x73
Mar 15 10:16:17 workstation kernel: [ 7188.313585]
[<ffffffff8106c6f6>] ? autoremove_wake_function+0x2a/0x2a
Mar 15 10:16:17 workstation kernel: [ 7188.313589]
[<ffffffff810a4df6>] ? grab_cache_page_write_begin+0xbd/0xcf
Mar 15 10:16:17 workstation kernel: [ 7188.313593]
[<ffffffff811b220c>] ? nfs_write_begin+0x86/0x1bb
Mar 15 10:16:17 workstation kernel: [ 7188.313597]
[<ffffffff810a4883>] ? generic_file_buffered_write+0x116/0x276
Mar 15 10:16:17 workstation kernel: [ 7188.313602]
[<ffffffff810a555c>] ? __generic_file_aio_write+0x2aa/0x2da
Mar 15 10:16:17 workstation kernel: [ 7188.313606]
[<ffffffff810d6067>] ? __sb_start_write+0xb5/0xe7
Mar 15 10:16:17 workstation kernel: [ 7188.313610]
[<ffffffff810a55f6>] ? generic_file_aio_write+0x6a/0xcf
Mar 15 10:16:17 workstation kernel: [ 7188.313614]
[<ffffffff811b286e>] ? nfs_file_write+0xa9/0x120
Mar 15 10:16:17 workstation kernel: [ 7188.313617]
[<ffffffff810d456d>] ? do_sync_write+0x83/0xbb
Mar 15 10:16:17 workstation kernel: [ 7188.313621]
[<ffffffff810d4a78>] ? vfs_write+0xa6/0x112
Mar 15 10:16:17 workstation kernel: [ 7188.313624]
[<ffffffff810d4caf>] ? sys_write+0x4b/0x73
Mar 15 10:16:17 workstation kernel: [ 7188.313628]
[<ffffffff814a4a12>] ? system_call_fastpath+0x16/0x1b
Mar 15 10:16:17 workstation kernel: [ 7188.313635] javaws          D
ffff88041c902068     0  5692   5691 0x00000006
Mar 15 10:16:17 workstation kernel: [ 7188.313638]  ffff88041c901db0
0000000000000086 ffff88041d0b5f00 ffff8803f2c2dfd8
Mar 15 10:16:17 workstation kernel: [ 7188.313642]  0000000000011200
0000000000004000 ffff8803f2c2da50 ffffffff810a4101
Mar 15 10:16:17 workstation kernel: [ 7188.313645]  ffffffff8110a4a2
ffff8803ed141a60 0007ffffffffffff 0000000000000000
Mar 15 10:16:17 workstation kernel: [ 7188.313649] Call Trace:
Mar 15 10:16:17 workstation kernel: [ 7188.313652]
[<ffffffff810a4101>] ? find_get_pages_tag+0x10b/0x13b
Mar 15 10:16:17 workstation kernel: [ 7188.313657]
[<ffffffff8110a4a2>] ? locks_remove_posix+0xa1/0xa9
Mar 15 10:16:17 workstation kernel: [ 7188.313661]
[<ffffffff810ac764>] ? pagevec_lookup_tag+0x18/0x1f
Mar 15 10:16:17 workstation kernel: [ 7188.313664]
[<ffffffff810aabae>] ? write_cache_pages+0x131/0x2d4
Mar 15 10:16:17 workstation kernel: [ 7188.313667]
[<ffffffff810a438e>] ? __lock_page+0x66/0x66
Mar 15 10:16:17 workstation kernel: [ 7188.313670]
[<ffffffff814a3482>] ? io_schedule+0x84/0xbf
Mar 15 10:16:17 workstation kernel: [ 7188.313674]
[<ffffffff810a4394>] ? sleep_on_page+0x6/0xa
Mar 15 10:16:17 workstation kernel: [ 7188.313676]
[<ffffffff814a1d19>] ? __wait_on_bit+0x3e/0x71
Mar 15 10:16:17 workstation kernel: [ 7188.313680]
[<ffffffff810a4101>] ? find_get_pages_tag+0x10b/0x13b
Mar 15 10:16:17 workstation kernel: [ 7188.313683]
[<ffffffff810a4570>] ? wait_on_page_bit+0x6e/0x73
Mar 15 10:16:17 workstation kernel: [ 7188.313687]
[<ffffffff8106c6f6>] ? autoremove_wake_function+0x2a/0x2a
Mar 15 10:16:17 workstation kernel: [ 7188.313690]
[<ffffffff810a4620>] ? filemap_fdatawait_range+0x73/0x121
Mar 15 10:16:17 workstation kernel: [ 7188.313695]
[<ffffffff810a5159>] ? filemap_write_and_wait_range+0x3b/0x4e
Mar 15 10:16:17 workstation kernel: [ 7188.313699]
[<ffffffff811cf02c>] ? nfs4_file_fsync+0x48/0x96
Mar 15 10:16:17 workstation kernel: [ 7188.313702]
[<ffffffff810d3515>] ? filp_close+0x3b/0x6a
Mar 15 10:16:17 workstation kernel: [ 7188.313707]
[<ffffffff810ea3a4>] ? do_close_on_exec+0xa7/0xd9
Mar 15 10:16:17 workstation kernel: [ 7188.313712]
[<ffffffff8110f8b4>] ? load_elf_binary+0x315/0x170b
Mar 15 10:16:17 workstation kernel: [ 7188.313717]
[<ffffffff810d8919>] ? search_binary_handler+0xba/0x26b
Mar 15 10:16:17 workstation kernel: [ 7188.313720]
[<ffffffff8110f59f>] ? load_elf_library+0x1ae/0x1ae
Mar 15 10:16:17 workstation kernel: [ 7188.313724]
[<ffffffff8110f296>] ? load_script+0x1aa/0x1b4
Mar 15 10:16:17 workstation kernel: [ 7188.313728]
[<ffffffff810d91a2>] ? get_arg_page+0x79/0xbe
Mar 15 10:16:17 workstation kernel: [ 7188.313732]
[<ffffffff810d8919>] ? search_binary_handler+0xba/0x26b
Mar 15 10:16:17 workstation kernel: [ 7188.313736]
[<ffffffff8110f0ec>] ? bm_status_write+0xd0/0xd0
Mar 15 10:16:17 workstation kernel: [ 7188.313741]
[<ffffffff810da39e>] ? do_execve_common.isra.32+0x2dd/0x3ee
Mar 15 10:16:17 workstation kernel: [ 7188.313745]
[<ffffffff810da6d1>] ? sys_execve+0x32/0x46
Mar 15 10:16:17 workstation kernel: [ 7188.313749]
[<ffffffff814a4ec9>] ? stub_execve+0x69/0xc0




Or the other day:
Mar 14 21:00:47 workstation kernel: [37645.540769] SysRq : Show Blocked
State
Mar 14 21:00:47 workstation kernel: [37645.541946]   task
PC stack   pid father
Mar 14 21:00:47 workstation kernel: [37645.541984] emerald         D
ffff88041c051a78     0  4208   4207 0x00000000
Mar 14 21:00:47 workstation kernel: [37645.541989]  ffff88041c0517c0
0000000000000086 ffff88041d0b4150 ffff8803f797dfd8
Mar 14 21:00:47 workstation kernel: [37645.541993]  0000000000011200
0000000000004000 ffff8803580901d8 ffff88042f7e06e8
Mar 14 21:00:47 workstation kernel: [37645.541997]  0000000000000000
000022f400004040 0000000000000000 ffff8803f797dbe8
Mar 14 21:00:47 workstation kernel: [37645.542000] Call Trace:
Mar 14 21:00:47 workstation kernel: [37645.542010]
[<ffffffff813d8a8f>] ? sock_sendmsg+0x89/0xa4
Mar 14 21:00:47 workstation kernel: [37645.542016]
[<ffffffff811b3213>] ? nfs_clear_inode+0x71/0x71
Mar 14 21:00:47 workstation kernel: [37645.542019]
[<ffffffff811b326a>] ? nfs_wait_bit_killable+0x57/0x6f
Mar 14 21:00:47 workstation kernel: [37645.542023]
[<ffffffff814a1d19>] ? __wait_on_bit+0x3e/0x71
Mar 14 21:00:47 workstation kernel: [37645.542028]
[<ffffffff8122d708>] ? _kstrtoull+0x2b/0x64
Mar 14 21:00:47 workstation kernel: [37645.542031]
[<ffffffff814a1dbb>] ? out_of_line_wait_on_bit+0x6f/0x78
Mar 14 21:00:47 workstation kernel: [37645.542034]
[<ffffffff811b3213>] ? nfs_clear_inode+0x71/0x71
Mar 14 21:00:47 workstation kernel: [37645.542039]
[<ffffffff8106c6f6>] ? autoremove_wake_function+0x2a/0x2a
Mar 14 21:00:47 workstation kernel: [37645.542043]
[<ffffffff811ce7a0>] ? nfs4_wait_clnt_recover+0x29/0x39
Mar 14 21:00:47 workstation kernel: [37645.542046]
[<ffffffff811ce7c3>] ? nfs4_client_recover_expired_lease+0x13/0x44
Mar 14 21:00:47 workstation kernel: [37645.542051]
[<ffffffff811c6295>] ? _nfs4_do_open+0x50/0x376
Mar 14 21:00:47 workstation kernel: [37645.542055]
[<ffffffff811c7eef>] ? verify_attr_len+0xc/0x27
Mar 14 21:00:47 workstation kernel: [37645.542060]
[<ffffffff8147b285>] ? rpcauth_lookup_credcache+0xbf/0x1ff
Mar 14 21:00:47 workstation kernel: [37645.542063]
[<ffffffff811cf4e1>] ? nfs4_have_delegation+0x33/0x39
Mar 14 21:00:47 workstation kernel: [37645.542067]
[<ffffffff811c661b>] ? nfs4_do_open+0x60/0xfe
Mar 14 21:00:47 workstation kernel: [37645.542070]
[<ffffffff811cf4e1>] ? nfs4_have_delegation+0x33/0x39
Mar 14 21:00:47 workstation kernel: [37645.542074]
[<ffffffff811c66e0>] ? nfs4_atomic_open+0x27/0x47
Mar 14 21:00:47 workstation kernel: [37645.542077]
[<ffffffff811b0a3b>] ? nfs_atomic_open+0x116/0x291
Mar 14 21:00:47 workstation kernel: [37645.542082]
[<ffffffff810df865>] ? do_last.isra.46+0x373/0x9c2
Mar 14 21:00:47 workstation kernel: [37645.542085]
[<ffffffff810dd1f1>] ? link_path_walk+0x76/0x78f
Mar 14 21:00:47 workstation kernel: [37645.542089]
[<ffffffff810dff67>] ? path_openat.isra.47+0xb3/0x3de
Mar 14 21:00:47 workstation kernel: [37645.542093]
[<ffffffff810e051a>] ? do_filp_open+0x2a/0x6e
Mar 14 21:00:47 workstation kernel: [37645.542097]
[<ffffffff810ea1ca>] ? __alloc_fd+0xe2/0xf5
Mar 14 21:00:47 workstation kernel: [37645.542101]
[<ffffffff810d435e>] ? do_sys_open+0x103/0x18a
Mar 14 21:00:47 workstation kernel: [37645.542105]
[<ffffffff814a4a12>] ? system_call_fastpath+0x16/0x1b
Mar 14 21:00:47 workstation kernel: [37645.542108] firefox         D
ffff88041c055bc8     0  4229      1 0x00000000
Mar 14 21:00:47 workstation kernel: [37645.542111]  ffff88041c055910
0000000000000082 ffff88041c09af80 ffff8803f53fffd8
Mar 14 21:00:47 workstation kernel: [37645.542115]  0000000000011200
0000000000004000 ffff8802d7eed3c0 ffff88041c85da80
Mar 14 21:00:47 workstation kernel: [37645.542118]  0000000000000000
ffff8802d7eed2a0 ffff8803fcb25b88 ffffffff81067b5b
Mar 14 21:00:47 workstation kernel: [37645.542122] Call Trace:
Mar 14 21:00:47 workstation kernel: [37645.542126]
[<ffffffff81067b5b>] ? __queue_work+0x242/0x267
Mar 14 21:00:47 workstation kernel: [37645.542130]
[<ffffffff8147a9f1>] ? rpc_execute+0xe/0x22
Mar 14 21:00:47 workstation kernel: [37645.542135]
[<ffffffff814758d1>] ? rpc_run_task+0x6e/0x76
Mar 14 21:00:47 workstation kernel: [37645.542139]
[<ffffffff810a438e>] ? __lock_page+0x66/0x66
Mar 14 21:00:47 workstation kernel: [37645.542143]
[<ffffffff814a3482>] ? io_schedule+0x84/0xbf
Mar 14 21:00:47 workstation kernel: [37645.542146]
[<ffffffff810a4394>] ? sleep_on_page+0x6/0xa
Mar 14 21:00:47 workstation kernel: [37645.542149]
[<ffffffff814a1d19>] ? __wait_on_bit+0x3e/0x71
Mar 14 21:00:47 workstation kernel: [37645.542152]
[<ffffffff810a4101>] ? find_get_pages_tag+0x10b/0x13b
Mar 14 21:00:47 workstation kernel: [37645.542156]
[<ffffffff810a4570>] ? wait_on_page_bit+0x6e/0x73
Mar 14 21:00:47 workstation kernel: [37645.542159]
[<ffffffff8106c6f6>] ? autoremove_wake_function+0x2a/0x2a
Mar 14 21:00:47 workstation kernel: [37645.542163]
[<ffffffff810a4620>] ? filemap_fdatawait_range+0x73/0x121
Mar 14 21:00:47 workstation kernel: [37645.542168]
[<ffffffff810a5159>] ? filemap_write_and_wait_range+0x3b/0x4e
Mar 14 21:00:47 workstation kernel: [37645.542171]
[<ffffffff811cf02c>] ? nfs4_file_fsync+0x48/0x96
Mar 14 21:00:47 workstation kernel: [37645.542174]
[<ffffffff810d4ad8>] ? vfs_write+0x106/0x112
Mar 14 21:00:47 workstation kernel: [37645.542178]
[<ffffffff810d3515>] ? filp_close+0x3b/0x6a
Mar 14 21:00:47 workstation kernel: [37645.542181]
[<ffffffff810d30f2>] ? sys_close+0x18/0x42
Mar 14 21:00:47 workstation kernel: [37645.542184]
[<ffffffff814a4a12>] ? system_call_fastpath+0x16/0x1b
Mar 14 21:00:47 workstation kernel: [37645.542190] pool            D
ffff88040d8a3238     0 12641   3957 0x00000000
Mar 14 21:00:47 workstation kernel: [37645.542193]  ffff88040d8a2f80
0000000000000086 ffffffff81681400 ffff8803f7bd5fd8
Mar 14 21:00:47 workstation kernel: [37645.542196]  0000000000011200
0000000000004000 0000000000000000 ffffffff811c7ce3
Mar 14 21:00:47 workstation kernel: [37645.542200]  ffff880325497400
ffffffff811c8a82 ffff88040d8a2f80 ffff88041d281df8
Mar 14 21:00:47 workstation kernel: [37645.542203] Call Trace:
Mar 14 21:00:47 workstation kernel: [37645.542207]
[<ffffffff811c7ce3>] ? decode_attr_time+0xe/0x33
Mar 14 21:00:47 workstation kernel: [37645.542211]
[<ffffffff811c8a82>] ? decode_getfattr_attrs+0x73f/0xa7f
Mar 14 21:00:47 workstation kernel: [37645.542215]
[<ffffffff814826fc>] ? xdr_inline_decode+0x31/0x95
Mar 14 21:00:47 workstation kernel: [37645.542219]
[<ffffffff811c7eef>] ? verify_attr_len+0xc/0x27
Mar 14 21:00:47 workstation kernel: [37645.542222]
[<ffffffff811cbecb>] ? decode_getfattr_generic.constprop.63+0x88/0x93
Mar 14 21:00:47 workstation kernel: [37645.542226]
[<ffffffff811b3213>] ? nfs_clear_inode+0x71/0x71
Mar 14 21:00:47 workstation kernel: [37645.542229]
[<ffffffff811b326a>] ? nfs_wait_bit_killable+0x57/0x6f
Mar 14 21:00:47 workstation kernel: [37645.542232]
[<ffffffff814a1d19>] ? __wait_on_bit+0x3e/0x71
Mar 14 21:00:47 workstation kernel: [37645.542235]
[<ffffffff814a1dbb>] ? out_of_line_wait_on_bit+0x6f/0x78
Mar 14 21:00:47 workstation kernel: [37645.542238]
[<ffffffff811b3213>] ? nfs_clear_inode+0x71/0x71
Mar 14 21:00:47 workstation kernel: [37645.542242]
[<ffffffff8106c6f6>] ? autoremove_wake_function+0x2a/0x2a
Mar 14 21:00:47 workstation kernel: [37645.542245]
[<ffffffff811ce7a0>] ? nfs4_wait_clnt_recover+0x29/0x39
Mar 14 21:00:47 workstation kernel: [37645.542248]
[<ffffffff811ce7c3>] ? nfs4_client_recover_expired_lease+0x13/0x44
Mar 14 21:00:47 workstation kernel: [37645.542252]
[<ffffffff811c6295>] ? _nfs4_do_open+0x50/0x376
Mar 14 21:00:47 workstation kernel: [37645.542256]
[<ffffffff811b3cde>] ? nfs_refresh_inode_locked+0x5a6/0x78f
Mar 14 21:00:47 workstation kernel: [37645.542260]
[<ffffffff811c661b>] ? nfs4_do_open+0x60/0xfe
Mar 14 21:00:47 workstation kernel: [37645.542263]
[<ffffffff811c66e0>] ? nfs4_atomic_open+0x27/0x47
Mar 14 21:00:47 workstation kernel: [37645.542267]
[<ffffffff811cf135>] ? nfs4_file_open+0xbb/0x13e
Mar 14 21:00:47 workstation kernel: [37645.542270]
[<ffffffff811b0093>] ? nfs_do_access+0x1f0/0x22d
Mar 14 21:00:47 workstation kernel: [37645.542273]
[<ffffffff811cf07a>] ? nfs4_file_fsync+0x96/0x96
Mar 14 21:00:47 workstation kernel: [37645.542276]
[<ffffffff810d33ae>] ? do_dentry_open+0x17a/0x222
Mar 14 21:00:47 workstation kernel: [37645.542280]
[<ffffffff810d356e>] ? finish_open+0x2a/0x33
Mar 14 21:00:47 workstation kernel: [37645.542283]
[<ffffffff810dfd1a>] ? do_last.isra.46+0x828/0x9c2
Mar 14 21:00:47 workstation kernel: [37645.542286]
[<ffffffff810dd1f1>] ? link_path_walk+0x76/0x78f
Mar 14 21:00:47 workstation kernel: [37645.542290]
[<ffffffff810dff67>] ? path_openat.isra.47+0xb3/0x3de
Mar 14 21:00:47 workstation kernel: [37645.542294]
[<ffffffff810bf30b>] ? unmap_region+0xb0/0xc2
Mar 14 21:00:47 workstation kernel: [37645.542298]
[<ffffffff810e051a>] ? do_filp_open+0x2a/0x6e
Mar 14 21:00:47 workstation kernel: [37645.542301]
[<ffffffff810ea1ca>] ? __alloc_fd+0xe2/0xf5
Mar 14 21:00:47 workstation kernel: [37645.542305]
[<ffffffff810d435e>] ? do_sys_open+0x103/0x18a
Mar 14 21:00:47 workstation kernel: [37645.542308]
[<ffffffff814a4a12>] ? system_call_fastpath+0x16/0x1b
Mar 14 21:00:47 workstation kernel: [37645.542310] pool            D
ffff88040d8a4fe8     0 12642   3957 0x00000000
Mar 14 21:00:47 workstation kernel: [37645.542313]  ffff88040d8a4d30
0000000000000086 ffff88041d0b4740 ffff88040daedfd8
Mar 14 21:00:47 workstation kernel: [37645.542316]  0000000000011200
0000000000004000 0000000000000000 ffffffff811c7ce3
Mar 14 21:00:47 workstation kernel: [37645.542320]  ffff8803f5986b00
ffffffff811c8a82 ffff88040d8a4d30 ffff88041ca023e8
Mar 14 21:00:47 workstation kernel: [37645.542323] Call Trace:
Mar 14 21:00:47 workstation kernel: [37645.542327]
[<ffffffff811c7ce3>] ? decode_attr_time+0xe/0x33
Mar 14 21:00:47 workstation kernel: [37645.542330]
[<ffffffff811c8a82>] ? decode_getfattr_attrs+0x73f/0xa7f
Mar 14 21:00:47 workstation kernel: [37645.542334]
[<ffffffff814826fc>] ? xdr_inline_decode+0x31/0x95
Mar 14 21:00:47 workstation kernel: [37645.542337]
[<ffffffff811c7eef>] ? verify_attr_len+0xc/0x27
Mar 14 21:00:47 workstation kernel: [37645.542341]
[<ffffffff811cbecb>] ? decode_getfattr_generic.constprop.63+0x88/0x93
Mar 14 21:00:47 workstation kernel: [37645.542344]
[<ffffffff811b3213>] ? nfs_clear_inode+0x71/0x71
Mar 14 21:00:47 workstation kernel: [37645.542348]
[<ffffffff811b326a>] ? nfs_wait_bit_killable+0x57/0x6f
Mar 14 21:00:47 workstation kernel: [37645.542350]
[<ffffffff814a1d19>] ? __wait_on_bit+0x3e/0x71
Mar 14 21:00:47 workstation kernel: [37645.542353]
[<ffffffff814a1dbb>] ? out_of_line_wait_on_bit+0x6f/0x78
Mar 14 21:00:47 workstation kernel: [37645.542358]
[<ffffffff8105f1cb>] ? internal_add_timer+0xd/0x28
Mar 14 21:00:47 workstation kernel: [37645.542361]
[<ffffffff811b3213>] ? nfs_clear_inode+0x71/0x71
Mar 14 21:00:47 workstation kernel: [37645.542364]
[<ffffffff8106c6f6>] ? autoremove_wake_function+0x2a/0x2a
Mar 14 21:00:47 workstation kernel: [37645.542368]
[<ffffffff811ce7a0>] ? nfs4_wait_clnt_recover+0x29/0x39
Mar 14 21:00:47 workstation kernel: [37645.542371]
[<ffffffff811ce7c3>] ? nfs4_client_recover_expired_lease+0x13/0x44
Mar 14 21:00:47 workstation kernel: [37645.542375]
[<ffffffff811c6295>] ? _nfs4_do_open+0x50/0x376
Mar 14 21:00:47 workstation kernel: [37645.542379]
[<ffffffff811c661b>] ? nfs4_do_open+0x60/0xfe
Mar 14 21:00:47 workstation kernel: [37645.542382]
[<ffffffff811c66e0>] ? nfs4_atomic_open+0x27/0x47
Mar 14 21:00:47 workstation kernel: [37645.542386]
[<ffffffff811cf135>] ? nfs4_file_open+0xbb/0x13e
Mar 14 21:00:47 workstation kernel: [37645.542389]
[<ffffffff811b0093>] ? nfs_do_access+0x1f0/0x22d
Mar 14 21:00:47 workstation kernel: [37645.542392]
[<ffffffff811cf07a>] ? nfs4_file_fsync+0x96/0x96
Mar 14 21:00:47 workstation kernel: [37645.542395]
[<ffffffff810d33ae>] ? do_dentry_open+0x17a/0x222
Mar 14 21:00:47 workstation kernel: [37645.542398]
[<ffffffff810d356e>] ? finish_open+0x2a/0x33
Mar 14 21:00:47 workstation kernel: [37645.542401]
[<ffffffff810dfd1a>] ? do_last.isra.46+0x828/0x9c2
Mar 14 21:00:47 workstation kernel: [37645.542404]
[<ffffffff810dd1f1>] ? link_path_walk+0x76/0x78f
Mar 14 21:00:47 workstation kernel: [37645.542408]
[<ffffffff810dff67>] ? path_openat.isra.47+0xb3/0x3de
Mar 14 21:00:47 workstation kernel: [37645.542412]
[<ffffffff810bf30b>] ? unmap_region+0xb0/0xc2
Mar 14 21:00:47 workstation kernel: [37645.542415]
[<ffffffff810e051a>] ? do_filp_open+0x2a/0x6e
Mar 14 21:00:47 workstation kernel: [37645.542419]
[<ffffffff810ea1ca>] ? __alloc_fd+0xe2/0xf5
Mar 14 21:00:47 workstation kernel: [37645.542422]
[<ffffffff810d435e>] ? do_sys_open+0x103/0x18a
Mar 14 21:00:47 workstation kernel: [37645.542426]
[<ffffffff814a4a12>] ? system_call_fastpath+0x16/0x1b
Mar 14 21:00:47 workstation kernel: [37645.542430]  ffff880358d71db0
0000000000000086 ffff88041d0b5f00 ffff8803f6b5dfd8
Mar 14 21:00:47 workstation kernel: [37645.542434]  0000000000011200
0000000000004000 ffff88041c09af80 ffff88042f491200
Mar 14 21:00:47 workstation kernel: [37645.542437]  ffff88041ca04150
ffff88042f591200 ffff880358d71db0 ffff88041ca04198
Mar 14 21:00:47 workstation kernel: [37645.542440] Call Trace:
Mar 14 21:00:47 workstation kernel: [37645.542444]
[<ffffffff81077989>] ? check_preempt_wakeup+0xe6/0x15e
Mar 14 21:00:47 workstation kernel: [37645.542448]
[<ffffffff8107331b>] ? check_preempt_curr+0x25/0x62
Mar 14 21:00:47 workstation kernel: [37645.542452]
[<ffffffff81073366>] ? ttwu_do_wakeup+0xe/0x7e
Mar 14 21:00:47 workstation kernel: [37645.542455]
[<ffffffff811b3213>] ? nfs_clear_inode+0x71/0x71
Mar 14 21:00:47 workstation kernel: [37645.542459]
[<ffffffff811b326a>] ? nfs_wait_bit_killable+0x57/0x6f
Mar 14 21:00:47 workstation kernel: [37645.542461]
[<ffffffff814a1d19>] ? __wait_on_bit+0x3e/0x71
Mar 14 21:00:47 workstation kernel: [37645.542464]
[<ffffffff814a1dbb>] ? out_of_line_wait_on_bit+0x6f/0x78
Mar 14 21:00:47 workstation kernel: [37645.542468]
[<ffffffff811b3213>] ? nfs_clear_inode+0x71/0x71
Mar 14 21:00:47 workstation kernel: [37645.542471]
[<ffffffff8106c6f6>] ? autoremove_wake_function+0x2a/0x2a
Mar 14 21:00:47 workstation kernel: [37645.542474]
[<ffffffff811ce7a0>] ? nfs4_wait_clnt_recover+0x29/0x39
Mar 14 21:00:47 workstation kernel: [37645.542478]
[<ffffffff811ce7c3>] ? nfs4_client_recover_expired_lease+0x13/0x44
Mar 14 21:00:47 workstation kernel: [37645.542481]
[<ffffffff811c6295>] ? _nfs4_do_open+0x50/0x376
Mar 14 21:00:47 workstation kernel: [37645.542485]
[<ffffffff811b3cde>] ? nfs_refresh_inode_locked+0x5a6/0x78f
Mar 14 21:00:47 workstation kernel: [37645.542488]
[<ffffffff811c661b>] ? nfs4_do_open+0x60/0xfe
Mar 14 21:00:47 workstation kernel: [37645.542492]
[<ffffffff811c66e0>] ? nfs4_atomic_open+0x27/0x47
Mar 14 21:00:47 workstation kernel: [37645.542495]
[<ffffffff811cf135>] ? nfs4_file_open+0xbb/0x13e
Mar 14 21:00:47 workstation kernel: [37645.542499]
[<ffffffff811cf4e1>] ? nfs4_have_delegation+0x33/0x39
Mar 14 21:00:47 workstation kernel: [37645.542502]
[<ffffffff811affae>] ? nfs_do_access+0x10b/0x22d
Mar 14 21:00:47 workstation kernel: [37645.542505]
[<ffffffff811cf07a>] ? nfs4_file_fsync+0x96/0x96
Mar 14 21:00:47 workstation kernel: [37645.542508]
[<ffffffff810d33ae>] ? do_dentry_open+0x17a/0x222
Mar 14 21:00:47 workstation kernel: [37645.542511]
[<ffffffff810d356e>] ? finish_open+0x2a/0x33
Mar 14 21:00:47 workstation kernel: [37645.542514]
[<ffffffff810dfd1a>] ? do_last.isra.46+0x828/0x9c2
Mar 14 21:00:47 workstation kernel: [37645.542518]
[<ffffffff810dd1f1>] ? link_path_walk+0x76/0x78f
Mar 14 21:00:47 workstation kernel: [37645.542521]
[<ffffffff810dff67>] ? path_openat.isra.47+0xb3/0x3de
Mar 14 21:00:47 workstation kernel: [37645.542525]
[<ffffffff810bf30b>] ? unmap_region+0xb0/0xc2
Mar 14 21:00:47 workstation kernel: [37645.542528]
[<ffffffff810e051a>] ? do_filp_open+0x2a/0x6e
Mar 14 21:00:47 workstation kernel: [37645.542532]
[<ffffffff810ea1ca>] ? __alloc_fd+0xe2/0xf5
Mar 14 21:00:47 workstation kernel: [37645.542535]
[<ffffffff810d435e>] ? do_sys_open+0x103/0x18a
Mar 14 21:00:47 workstation kernel: [37645.542539]
[<ffffffff814a4a12>] ? system_call_fastpath+0x16/0x1b


and some more....

After waiting some minutes it sometimes recovers from these blocks and I
can continue to work. Today the block came after about 2 hours. So I
switched to NFSv3 again just now to see if that is more stable.

When the blocks are happing there is nothing in the logs on server nor
on client side.

Do you have any hints or ideas?

Best regards and thank you in advance,

Matthias Jansen

--=-iGBjNsqlNxvy6/FerUCr
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