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Bug 758202 - pNFS read crashes when mounting with rsize < 4096
Summary: pNFS read crashes when mounting with rsize < 4096
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel
Version: 6.2
Hardware: Unspecified
OS: Linux
unspecified
medium
Target Milestone: rc
: ---
Assignee: nfs-maint
QA Contact: Jian Li
URL:
Whiteboard: NFSv4 pNFS NFS Patch
Depends On:
Blocks: 910083
TreeView+ depends on / blocked
 
Reported: 2011-11-29 14:28 UTC by Jorge Mora
Modified: 2014-03-04 00:08 UTC (History)
6 users (show)

Fixed In Version: kernel-2.6.32-288.el6
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-02-21 05:59:59 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
NFSv4.1 fix page number calculation bug for filelayout decode buffers (1.48 KB, patch)
2012-05-08 13:52 UTC, Andy Adamson 		no flags Details | Diff
A backported version up the upstream patch (1.48 KB, patch)
2012-05-08 15:40 UTC, Steve Dickson 		no flags Details | Diff
View All


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2013:0496 0 normal SHIPPED_LIVE Important: Red Hat Enterprise Linux 6 kernel update 2013-02-20 21:40:54 UTC

Description Jorge Mora 2011-11-29 14:28:03 UTC 
Description of problem:
Client crashes when attempting to read over pNFS when mounting
with rsize < 4096.

Note that this problem does not occur with NFSv4.1 (non-pNFS), NFSv4.0,
NFSv3 or NFSv2. Also, this problem occurs only with read, pNFS writes
of any size work just fine.


Version-Release number of selected component (if applicable):
RHEL6.2 Beta 2.6.32-220.el6.x86_64


How reproducible:
100%


Steps to Reproduce:
1. Mount with rsize < 4096
   mount -t nfs4 -o minorversion=1,hard,intr,rsize=1024 server:/ /mnt/t
2. Read file
   cat /mnt/t/testfile
3.
  

Actual results:
The client crashes


Expected results:
Read should succeed


Additional info:
RIP: 0010:[<ffffffffa04928df>]  [<ffffffffa04928df>] xdr_set_page_base+0x4f/0xb0 [sunrpc]
RSP: 0018:ffff88003c6e5638  EFLAGS: 00010246
RAX: 0000160000000000 RBX: ffff88003bc76c00 RCX: 0000000000000000
RDX: 0000000000000058 RSI: 0000000000000000 RDI: ffff88003c6e56c8
RBP: ffff88003c6e5638 R08: 0000000000000010 R09: 0000000000000058
R10: 0000000000000000 R11: 00000000000000c0 R12: ffff88003c6e5758
R13: ffff88003c6e5688 R14: 00000000000000d0 R15: 00000000000080d0
FS:  00007fbbb4f12700(0000) GS:ffff880002200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000010 CR3: 000000003b77e000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process cat (pid: 3146, threadinfo ffff88003c6e4000, task ffff88003b632b00)
Stack:
 ffff88003c6e5648 ffffffffa0492a51 ffff88003c6e5738 ffffffffa00ee049
<0> 0000000000015fc0 ffff88003c2e22c0 00000000ffffffff ffff88003c2e22c0
<0> ffffea0000ca7a58 000000d0814eca40 0000000000000000 0000000000000000
Call Trace:
 [<ffffffffa0492a51>] xdr_init_decode+0x61/0x70 [sunrpc]
 [<ffffffffa00ee049>] filelayout_decode_layout+0x99/0x3f0 [nfs_layout_nfsv41_files]
 [<ffffffffa00ee44d>] filelayout_alloc_lseg+0xad/0x4d0 [nfs_layout_nfsv41_files]
 [<ffffffffa057be15>] pnfs_layout_process+0xa5/0x360 [nfs]
 [<ffffffff81090c30>] ? wake_bit_function+0x0/0x50
 [<ffffffffa056566d>] nfs4_proc_layoutget+0xcd/0x130 [nfs]
 [<ffffffffa057d34b>] pnfs_update_layout+0x55b/0x790 [nfs]
 [<ffffffffa0555597>] nfs_pagein_multi+0xd7/0x1e0 [nfs]
 [<ffffffffa0555780>] ? readpage_async_filler+0x0/0x160 [nfs]
 [<ffffffffa05528e9>] nfs_pageio_doio+0x19/0x60 [nfs]
 [<ffffffffa05529eb>] nfs_pageio_add_request+0x5b/0x130 [nfs]
 [<ffffffffa0555808>] readpage_async_filler+0x88/0x160 [nfs]
 [<ffffffffa0555780>] ? readpage_async_filler+0x0/0x160 [nfs]
 [<ffffffff81126d82>] read_cache_pages+0xa2/0xf0
 [<ffffffffa0554ab1>] nfs_readpages+0x171/0x250 [nfs]
 [<ffffffffa05554c0>] ? nfs_pagein_multi+0x0/0x1e0 [nfs]
 [<ffffffffa057d600>] ? pnfs_read_pg_test+0x0/0x80 [nfs]
 [<ffffffff81126b25>] __do_page_cache_readahead+0x185/0x210
 [<ffffffff81126bd1>] ra_submit+0x21/0x30
 [<ffffffff81126f45>] ondemand_readahead+0x115/0x240
 [<ffffffff81127163>] page_cache_sync_readahead+0x33/0x50
 [<ffffffff81112778>] generic_file_aio_read+0x558/0x700
 [<ffffffff811458fd>] ? page_add_new_anon_rmap+0x9d/0xf0
 [<ffffffffa05470da>] nfs_file_read+0xca/0x130 [nfs]
 [<ffffffff8117641a>] do_sync_read+0xfa/0x140
 [<ffffffff81090bf0>] ? autoremove_wake_function+0x0/0x40
 [<ffffffff8117b6b4>] ? cp_new_stat+0xe4/0x100
 [<ffffffff8121902b>] ? selinux_file_permission+0xfb/0x150
 [<ffffffff8120c3c6>] ? security_file_permission+0x16/0x20
 [<ffffffff81176e15>] vfs_read+0xb5/0x1a0
 [<ffffffff810d46e2>] ? audit_syscall_entry+0x272/0x2a0
 [<ffffffff81176f51>] sys_read+0x51/0x90
 [<ffffffff8100b0f2>] system_call_fastpath+0x16/0x1b
Code: f1 01 f0 41 89 c0 41 c1 e8 0c 45 89 c0 49 c1 e0 03 4c 03 41 20 89 c1 48 b8 00 00 00 00 00 16 00 00 81 e1 ff 0f 00 00 4c 89 47 30 <49> 03 00 49 b8 b7 6d db b6 6d db b6 6d 48 c7 47 18 00 00 00 00 
RIP  [<ffffffffa04928df>] xdr_set_page_base+0x4f/0xb0 [sunrpc]
 RSP <ffff88003c6e5638>
CR2: 0000000000000010
---[ end trace e6f5483a165c0179 ]---
Kernel panic - not syncing: Fatal exception
Pid: 3146, comm: cat Tainted: G      D    ----------------   2.6.32-220.el6.x86_64 #1
Call Trace:
 [<ffffffff814ec341>] ? panic+0x78/0x143
 [<ffffffff814f04d4>] ? oops_end+0xe4/0x100
 [<ffffffff8104230b>] ? no_context+0xfb/0x260
 [<ffffffffa01d38be>] ? e1000_xmit_frame+0x9ce/0x1110 [e1000]
Comment 2 Steve Dickson 2012-02-02 01:51:25 UTC 
Just curious... What server are you using?
Comment 4 RHEL Program Management 2012-05-03 05:19:42 UTC 
Since RHEL 6.3 External Beta has begun, and this bug remains
unresolved, it has been rejected as it is not proposed as
exception or blocker.

Red Hat invites you to ask your support representative to
propose this request, if appropriate and relevant, in the
next release of Red Hat Enterprise Linux.
Comment 5 Andy Adamson 2012-05-08 13:52:38 UTC 
Created attachment 582994 [details]
NFSv4.1 fix page number calculation bug for filelayout  decode buffers

Fixes bug.
Comment 6 Steve Dickson 2012-05-08 15:40:33 UTC 
Created attachment 583024 [details]
A backported version up the upstream patch
Comment 9 RHEL Program Management 2012-06-27 13:45:42 UTC 
This request was evaluated by Red Hat Product Management for
inclusion in a Red Hat Enterprise Linux release.  Product
Management has requested further review of this request by
Red Hat Engineering, for potential inclusion in a Red Hat
Enterprise Linux release for currently deployed products.
This request is not yet committed for inclusion in a release.
Comment 10 Jian Li 2012-07-04 06:32:37 UTC 
Reproducer refer to comment 0, if no pnfs server available, try to use pynfs.
Comment 11 Jarod Wilson 2012-07-23 17:16:22 UTC 
Patch(es) available on kernel-2.6.32-288.el6
Comment 14 Jian Li 2013-01-18 09:13:48 UTC 
This bug is verified on rhel6.4 


[root@dell-p690-01 ~]# mount -o vers=4,minorversion=1,rsize=1024,intr,hard netapp-qe2.lab.bos.redhat.com:/export/qe-test /mnt/test
[root@dell-p690-01 ~]# dd if=/dev/zero of=/mnt/test/img bs=1M count=1
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.30428 s, 3.4 MB/s
[root@dell-p690-01 ~]# umount /mnt/test
[root@dell-p690-01 ~]# mount -o vers=4,minorversion=1,rsize=1024,intr,hard netapp-qe2.lab.bos.redhat.com:/export/qe-test /mnt/test
[root@dell-p690-01 ~]# cat /mnt/test/img > /dev/zero
[root@dell-p690-01 ~]# uname -a
Linux dell-p690-01.rhts.eng.bos.redhat.com 2.6.32-355.el6.x86_64 #1 SMP Tue Jan 15 17:45:38 EST 2013 x86_64 x86_64 x86_64 GNU/Linux
Comment 16 errata-xmlrpc 2013-02-21 05:59:59 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2013-0496.html
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