I just upgraded my home server from kernel 3.3.5 to 3.4.0 and ran into
some trouble. My laptop, a nfsroot client, will not run firefox and
thunderbird anymore. When I start these programs from an xterm, the
cursor goes to the next line and waits indefinitely.
I do not know if there is any order is lsof's output. A lsof | grep
firefox or thunderbird shows ......./.parentlock as the last line.
It does not matter whether the client is running a 3.4.0 or a 3.3.0
kernel, or if the server is running on top of xen or not.
There is some noise in the servers dmesg:
[ 241.256684] INFO: task kworker/u:2:801 blocked for more than 120 seconds.
[ 241.256691] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 241.256698] kworker/u:2 D 000000000000000c 0 801 2
0x00000000
[ 241.256710] ffff8801390e5cf0 0000000000000046 0000000000012d00
0000000000012d00
[ 241.256721] 0000000000012d00 ffff880139f8bd50 0000000000012d00
ffff8801390e5fd8
[ 241.256732] ffff8801390e5fd8 0000000000012d00 ffff880139ce4420
ffff880139f8bd50
[ 241.256743] Call Trace:
[ 241.256759] [<ffffffff8158733e>] schedule+0x64/0x66
[ 241.256769] [<ffffffff8120184e>] cld_pipe_upcall+0x95/0xd1
[ 241.256780] [<ffffffff811fbd8d>] ? nfsd4_exchange_id+0x23e/0x23e
[ 241.256789] [<ffffffff81201d06>] nfsd4_cld_grace_done+0x50/0x8a
[ 241.256798] [<ffffffff81202233>] nfsd4_record_grace_done+0x18/0x1a
[ 241.256807] [<ffffffff811fbdd7>] laundromat_main+0x4a/0x213
[ 241.256818] [<ffffffff8106a06b>] ? need_resched+0x1e/0x28
[ 241.256826] [<ffffffff8158725d>] ? __schedule+0x49d/0x4b5
[ 241.256835] [<ffffffff811fbd8d>] ? nfsd4_exchange_id+0x23e/0x23e
[ 241.256844] [<ffffffff8105be2d>] process_one_work+0x190/0x28d
[ 241.256854] [<ffffffff8105ca67>] worker_thread+0x105/0x189
[ 241.256862] [<ffffffff81587b8d>] ? _raw_spin_unlock_irqrestore+0x1a/0x1d
[ 241.256872] [<ffffffff8105c962>] ? manage_workers.clone.17+0x173/0x173
[ 241.256881] [<ffffffff810604b0>] kthread+0x8a/0x92
[ 241.256891] [<ffffffff815899a4>] kernel_thread_helper+0x4/0x10
[ 241.256900] [<ffffffff81060426>] ?
kthread_freezable_should_stop+0x47/0x47
[ 241.256909] [<ffffffff815899a0>] ? gs_change+0x13/0x13
or xenified:
[ 240.563448] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 240.563458] kworker/u:2 D ffff88007fc12d00 0 808 2
0x00000000
[ 240.563479] ffff88007532fcf0 0000000000000246 0000000000012d00
0000000000012d00
[ 240.563504] 0000000000012d00 ffff880075f7caf0 0000000000012d00
ffff88007532ffd8
[ 240.563530] ffff88007532ffd8 0000000000012d00 ffffffff81813020
ffff880075f7caf0
[ 240.563555] Call Trace:
[ 240.563578] [<ffffffff8158733e>] schedule+0x64/0x66
[ 240.563594] [<ffffffff8120184e>] cld_pipe_upcall+0x95/0xd1
[ 240.563611] [<ffffffff811fbd8d>] ? nfsd4_exchange_id+0x23e/0x23e
[ 240.563625] [<ffffffff81201d06>] nfsd4_cld_grace_done+0x50/0x8a
[ 240.563640] [<ffffffff81202233>] nfsd4_record_grace_done+0x18/0x1a
[ 240.563654] [<ffffffff811fbdd7>] laundromat_main+0x4a/0x213
[ 240.563670] [<ffffffff8100d085>] ? xen_spin_unlock+0x12/0x30
[ 240.563685] [<ffffffff811fbd8d>] ? nfsd4_exchange_id+0x23e/0x23e
[ 240.563700] [<ffffffff8105be2d>] process_one_work+0x190/0x28d
[ 240.563714] [<ffffffff8100d337>] ? xen_spin_lock+0xb/0xd
[ 240.563729] [<ffffffff8105ca67>] worker_thread+0x105/0x189
[ 240.563743] [<ffffffff81587b8d>] ? _raw_spin_unlock_irqrestore+0x1a/0x1d
[ 240.563758] [<ffffffff8105c962>] ? manage_workers.clone.17+0x173/0x173
[ 240.563772] [<ffffffff810604b0>] kthread+0x8a/0x92
[ 240.563787] [<ffffffff815899a4>] kernel_thread_helper+0x4/0x10
[ 240.563802] [<ffffffff81587f38>] ? retint_restore_args+0x5/0x6
[ 240.563816] [<ffffffff815899a0>] ? gs_change+0x13/0x13
--
Hans
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