Rüdiger Meier <sweet_f_a@...> writes: > > On Tuesday 20 September 2011, J. Bruce Fields wrote: > > On Sat, Aug 27, 2011 at 09:22:53PM +0200, Rüdiger Meier wrote: > > > I've got an annoying problem with my nfs4 clients. > > > Lately I see many processes hanging in state D when reading from > > > nfs mount. Sometimes they can be killed sometimes not. > > > > Is this still happening? > > Yes, allthough we've managed to avoid the "dangerous" things. > Sometimes we have also probs like the other current thread > "Writing / Locking problem with NFSv4". > For what it's worth: we have been seeing very similar behavior on our OpenSuSE 11.3 (x86_64, 2.6.34.10-0.2) systems, though one other difference is that we are using NFSv3 for these mounts. I was able to get some traces via sysrq, though no ethernet dumps (these problems would happen occasionally, impossible to determine when/where). These are heavily loaded systems, doing lots of compute and IO. 1 [3754730.533669] R D ffffffff810dc3e0 0 22621 1 0x00000004 2 [3754730.533671] ffff88165f993cb8 0000000000000086 ffff881037174600 ffffffffa0332bbd 3 [3754730.533673] 0000000000013e80 0000000000013e80 ffff88165f993fd8 0000000000013e80 4 [3754730.533675] ffff88165f993fd8 ffff881e5cd521c0 0000000000013e80 0000000000013e80 5 [3754730.533676] Call Trace: 6 [3754730.533678] [<ffffffff8145004e>] io_schedule+0x6e/0xb0 7 [3754730.533681] [<ffffffff810dc418>] sync_page+0x38/0x50 8 [3754730.533683] [<ffffffff814505da>] __wait_on_bit_lock+0x4a/0xb0 9 [3754730.533685] [<ffffffff810dc3be>] __lock_page+0x5e/0x70 10 [3754730.533687] [<ffffffff810dd2f8>] filemap_fault+0x2f8/0x410 11 [3754730.533690] [<ffffffff810f7c12>] __do_fault+0x52/0x4f0 12 [3754730.533692] [<ffffffff810fbf82>] handle_mm_fault+0x1b2/0xbd0 13 [3754730.533694] [<ffffffff81455799>] do_page_fault+0x169/0x3a0 14 [3754730.533697] [<ffffffff8145271f>] page_fault+0x1f/0x30 15 [3754730.533699] [<00007f79e2486ce0>] 0x7f79e2486ce0 This is pretty representative of the processses in D. Does this help, or are there too many differences from the original? Thanks Michael -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
