From: Steve Dickson <SteveD@redhat.com>
To: Jim Rees <rees@umich.edu>
Cc: linux-nfs@vger.kernel.org, peter honeyman <honey@citi.umich.edu>
Subject: Re: hung iozone client bug recap
Date: Fri, 04 Mar 2011 11:28:08 -0500 [thread overview]
Message-ID: <4D711318.7070909@RedHat.com> (raw)
In-Reply-To: <20110303222219.GA16426@merit.edu>
We are seeing this too with a straight Fedora 14 kernel.
https://bugzilla.redhat.com/show_bug.cgi?id=669204
Unfortunately we are not able to reproduce it as easily as
you are...
steved.
On 03/03/2011 05:22 PM, Jim Rees wrote:
> I've asked about this before but now I have some new information.
>
> When I run a multithreaded iozone test against an EMC server, I reliably get
> a hung client. We have reproduced this problem with a wide range of client
> kernel versions, from 2.6.33.3-85.fc13.x86_64 up to benny's pnfs-all-latest,
> and on both 4.0 and 4.1.
>
> Trond thinks the server is failing to reply to some rpc, but looking at the
> trace I don't see it. The hang happens about 39 seconds in. The trace is
> here:
> http://www.citi.umich.edu/projects/nfsv4/pnfs/block/80.pcap.gz
>
> The iozone command is like this. Note the -o option for O_SYNC, this seem
> to be important. There are three threads on each of four client.
> iozone -r 2m -s 256m -w -W -c -t 12 -i 0 -+m ioz-4x3 -o -+n
>
> The call trace is usually something like this:
> INFO: task iozone:3587 blocked for more than 120 seconds.
> [<ffffffff810c1314>] ? sync_page+0x0/0x45
> [<ffffffff814297bc>] io_schedule+0x6e/0xb0
> [<ffffffff810c1355>] sync_page+0x41/0x45
> [<ffffffff81429cf8>] __wait_on_bit+0x43/0x76
> [<ffffffff810c14ae>] wait_on_page_bit+0x6d/0x74
> [<ffffffff8106484b>] ? wake_bit_function+0x0/0x2e
> [<ffffffff810c94c0>] ? pagevec_lookup_tag+0x20/0x29
> [<ffffffff810c1751>] filemap_fdatawait_range+0x9f/0x173
> [<ffffffff810c18ce>] filemap_write_and_wait_range+0x3e/0x51
> [<ffffffff8111fa53>] vfs_fsync_range+0x5a/0xad
> [<ffffffff8111faf9>] generic_write_sync+0x53/0x55
> [<ffffffff810c1d4b>] generic_file_aio_write+0x86/0xa2
> [<ffffffffa0321bf8>] nfs_file_write+0xed/0x169 [nfs]
> [<ffffffff811017c5>] do_sync_write+0xbf/0xfc
> [<ffffffff810f4dc9>] ? __slab_free+0x28/0x22e
> [<ffffffff81204b7d>] ? might_fault+0x1c/0x1e
> [<ffffffff811be22b>] ? security_file_permission+0x11/0x13
> [<ffffffff81101d23>] vfs_write+0xa9/0x106
> [<ffffffff81101e36>] sys_write+0x45/0x69
> [<ffffffff81009b02>] system_call_fastpath+0x16/0x1b
>
> Here's a sample rpc queue (not from the same run as the trace):
> echo 0 >/proc/sys/sunrpc/rpc_debug
> r38-13-78: [ 1999.083961] -pid- flgs status -client- --rqstp- -timeout ---ops--
> r38-13-78: [ 1999.083987] 34411 0001 0 ffff880247b2e800 ffff8802550e6930 60000 ffffffffa03c3810 nfsv4 WRITE a:call_status q:xprt_pending
> r38-13-78: [ 1999.084004] 34412 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084021] 34413 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084036] 34414 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084050] 34415 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084064] 34416 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084078] 34417 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:NFS client
> r38-13-78: [ 1999.084092] 34418 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084105] 34419 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:NFS client
> r38-13-78: [ 1999.084119] 34420 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084137] 34421 0001 0 ffff880247b2e800 ffff8802550e6dc8 60000 ffffffffa03c3810 nfsv4 WRITE a:call_status q:xprt_pending
> r38-13-78: [ 1999.084153] 34422 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084167] 34423 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084181] 34424 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084195] 34425 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084209] 34426 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084223] 34427 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084236] 34428 0001 0 ffff880247b2e800 ffff8802550e7260 60000 ffffffffa03c3810 nfsv4 WRITE a:call_status q:xprt_pending
> r38-13-78: [ 1999.084250] 34429 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084262] 34430 0001 0 ffff880247b2e800 ffff8802550e6498 60000 ffffffffa03c3810 nfsv4 WRITE a:call_status q:xprt_pending
> r38-13-78: [ 1999.084276] 34431 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084288] 34432 0001 0 ffff880247b2e800 ffff8802550e6620 60000 ffffffffa03c3810 nfsv4 WRITE a:call_status q:xprt_pending
> r38-13-78: [ 1999.084301] 34433 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084316] 34434 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084330] 34435 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084344] 34436 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:NFS client
> r38-13-78: [ 1999.084357] 34437 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084369] 34438 0001 -11 ffff880247b2e800 ffff8802550e6188 60000 ffffffffa03c3810 nfsv4 WRITE a:call_transmit_status q:xprt_pending
> r38-13-78: [ 1999.084402] 34439 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084419] 34440 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084433] 34441 0001 0 ffff880247b2e800 ffff8802550e6c40 60000 ffffffffa03c3810 nfsv4 WRITE a:call_status q:xprt_pending
> r38-13-78: [ 1999.084449] 34442 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:NFS client
> r38-13-78: [ 1999.084465] 34443 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:NFS client
> r38-13-78: [ 1999.084481] 34444 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084498] 34445 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:NFS client
> r38-13-78: [ 1999.084514] 34446 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084529] 34447 0001 0 ffff880247b2e800 ffff8802550e73e8 60000 ffffffffa03c3810 nfsv4 WRITE a:call_status q:xprt_pending
> r38-13-78: [ 1999.084545] 34448 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084561] 34449 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084577] 34450 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084592] 34451 0001 0 ffff880247b2e800 ffff8802550e70d8 60000 ffffffffa03c3810 nfsv4 WRITE a:call_status q:xprt_pending
> r38-13-78: [ 1999.084608] 34452 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:NFS client
> r38-13-78: [ 1999.084625] 34453 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084642] 34454 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084658] 34455 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084674] 34456 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084690] 34457 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:NFS client
> r38-13-78: [ 1999.084706] 34458 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084722] 34459 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084738] 34460 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084754] 34461 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084770] 34462 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084786] 34463 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:NFS client
> r38-13-78: [ 1999.084802] 34464 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084817] 34465 0001 -11 ffff880247b2e800 ffff8802550e6f50 0 ffffffffa03c3810 nfsv4 WRITE a:call_status q:xprt_sending
> r38-13-78: [ 1999.084833] 34466 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:NFS client
> r38-13-78: [ 1999.084848] 34467 0001 0 ffff880247b2e800 ffff8802550e7570 60000 ffffffffa03c3810 nfsv4 WRITE a:call_status q:xprt_pending
> r38-13-78: [ 1999.084864] 34468 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084878] 34469 0001 -11 ffff880247b2e800 ffff8802550e6310 0 ffffffffa03c3810 nfsv4 WRITE a:call_status q:xprt_sending
> r38-13-78: [ 1999.084894] 34470 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:NFS client
> r38-13-78: [ 1999.084910] 34471 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084925] 34472 0001 0 ffff880247b2e800 ffff8802550e76f8 60000 ffffffffa03c3810 nfsv4 WRITE a:call_status q:xprt_pending
> r38-13-78: [ 1999.084943] 34473 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084959] 34474 0001 0 ffff880247b2e800 (null) 0 ffffffffa03c3810 nfsv4 WRITE a:rpc_prepare_task q:ForeChannel Slot table
> r38-13-78: [ 1999.084974] 18306 0280 0 ffff880253a4a000 ffff8802550e6ab8 60000 ffffffffa03cdb80 nfsv4 SEQUENCE a:call_status q:xprt_pending
> --
> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2011-03-04 16:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-03 22:22 hung iozone client bug recap Jim Rees
2011-03-04 16:28 ` Steve Dickson [this message]
2011-03-04 17:49 ` Jim Rees
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4D711318.7070909@RedHat.com \
--to=steved@redhat.com \
--cc=honey@citi.umich.edu \
--cc=linux-nfs@vger.kernel.org \
--cc=rees@umich.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.