Comment 9 for bug 480444

I think we may have experienced the same bug as noted here because syslog shows sys_ftruncate().

I already posted a bug report here so this is a crosspost but I think this could more proper bug report for our issue:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/578866/comments/4

I try to run "bzr status" on our couple hundred megabyte development branch on our new NFSv4 share. This causes Bazaar on client to halt and cause errors on latest Ubuntu 10.10 AMD64 kernel 2.6.35-27-generic.

This message appears repeately (every 120sec) in the syslog:
Mar 14 17:25:46 hf kernel: [ 1080.078609] INFO: task bzr:2348 blocked for more than 120 seconds.
Mar 14 17:25:46 hf kernel: [ 1080.078611] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 14 17:25:46 hf kernel: [ 1080.078614] bzr D 00000000ffffa30f 0 2348 2347 0x00000000
Mar 14 17:25:46 hf kernel: [ 1080.078618] ffff880341823c08 0000000000000086 ffff880300000000 0000000000015980
Mar 14 17:25:46 hf kernel: [ 1080.078623] ffff880341823fd8 0000000000015980 ffff880341823fd8 ffff880344e3db80
Mar 14 17:25:46 hf kernel: [ 1080.078626] 0000000000015980 0000000000015980 ffff880341823fd8 0000000000015980
Mar 14 17:25:46 hf kernel: [ 1080.078630] Call Trace:
Mar 14 17:25:46 hf kernel: [ 1080.078637] [<ffffffff81101c50>] ? sync_page+0x0/0x50
Mar 14 17:25:46 hf kernel: [ 1080.078641] [<ffffffff81589093>] io_schedule+0x73/0xc0
Mar 14 17:25:46 hf kernel: [ 1080.078644] [<ffffffff81101c8d>] sync_page+0x3d/0x50
Mar 14 17:25:46 hf kernel: [ 1080.078647] [<ffffffff8158996f>] __wait_on_bit+0x5f/0x90
Mar 14 17:25:46 hf kernel: [ 1080.078650] [<ffffffff81101e43>] wait_on_page_bit+0x73/0x80
Mar 14 17:25:46 hf kernel: [ 1080.078655] [<ffffffff8107faf0>] ? wake_bit_function+0x0/0x40
Mar 14 17:25:46 hf kernel: [ 1080.078659] [<ffffffff8110c605>] ? pagevec_lookup_tag+0x25/0x40
Mar 14 17:25:46 hf kernel: [ 1080.078662] [<ffffffff8110230d>] filemap_fdatawait_range+0x10d/0x1a0
Mar 14 17:25:46 hf kernel: [ 1080.078666] [<ffffffff811023cb>] filemap_fdatawait+0x2b/0x30
Mar 14 17:25:46 hf kernel: [ 1080.078669] [<ffffffff811026d4>] filemap_write_and_wait+0x44/0x50
Mar 14 17:25:46 hf kernel: [ 1080.078684] [<ffffffffa1802fec>] nfs_setattr+0x14c/0x160 [nfs]
Mar 14 17:25:46 hf kernel: [ 1080.078688] [<ffffffff8116c69b>] notify_change+0x16b/0x310
Mar 14 17:25:46 hf kernel: [ 1080.078692] [<ffffffff81152694>] do_truncate+0x64/0xa0
Mar 14 17:25:46 hf kernel: [ 1080.078695] [<ffffffff8115292b>] T.784+0xeb/0x110
Mar 14 17:25:46 hf kernel: [ 1080.078698] [<ffffffff8115295e>] sys_ftruncate+0xe/0x10
Mar 14 17:25:46 hf kernel: [ 1080.078703] [<ffffffff8100a0f2>] system_call_fastpath+0x16/0x1b