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Tigran Mkrtchyan f17f8a14e8 nfs: flexfiles: fix kernel OOPS if MDS returns unsupported DS type 
this fix aims to fix dereferencing of a mirror in an error state when MDS
returns unsupported DS type (IOW, not v3), which causes the following oops:

[  220.370709] BUG: unable to handle kernel NULL pointer dereference at 0000000000000065
[  220.370842] IP: ff_layout_mirror_valid+0x2d/0x110 [nfs_layout_flexfiles]
[  220.370920] PGD 0

[  220.370972] Oops: 0000 [#1] SMP
[  220.371013] Modules linked in: nfnetlink_queue nfnetlink_log bluetooth nfs_layout_flexfiles rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat ebtable_broute bridge stp llc ip6table_raw ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security iptable_raw iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack libcrc32c iptable_mangle iptable_security ebtable_filter ebtables ip6table_filter ip6_tables binfmt_misc intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel btrfs kvm arc4 snd_hda_codec_hdmi iwldvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel intel_cstate mac80211 xor uvcvideo
[  220.371814]  videobuf2_vmalloc videobuf2_memops snd_hda_codec_idt mei_wdt videobuf2_v4l2 snd_hda_codec_generic iTCO_wdt ppdev videobuf2_core iTCO_vendor_support dell_rbtn dell_wmi iwlwifi sparse_keymap dell_laptop dell_smbios snd_hda_intel dcdbas videodev snd_hda_codec dell_smm_hwmon snd_hda_core media cfg80211 intel_uncore snd_hwdep raid6_pq snd_seq intel_rapl_perf snd_seq_device joydev i2c_i801 rfkill lpc_ich snd_pcm parport_pc mei_me parport snd_timer dell_smo8800 mei snd shpchp soundcore tpm_tis tpm_tis_core tpm nfsd auth_rpcgss nfs_acl lockd grace sunrpc i915 nouveau mxm_wmi ttm i2c_algo_bit drm_kms_helper crc32c_intel e1000e drm sdhci_pci firewire_ohci sdhci serio_raw mmc_core firewire_core ptp crc_itu_t pps_core wmi fjes video
[  220.372568] CPU: 7 PID: 4988 Comm: cat Not tainted 4.10.5-200.fc25.x86_64 #1
[  220.372647] Hardware name: Dell Inc. Latitude E6520/0J4TFW, BIOS A06 07/11/2011
[  220.372729] task: ffff94791f6ea580 task.stack: ffffb72b88c0c000
[  220.372802] RIP: 0010:ff_layout_mirror_valid+0x2d/0x110 [nfs_layout_flexfiles]
[  220.372883] RSP: 0018:ffffb72b88c0f970 EFLAGS: 00010246
[  220.372945] RAX: 0000000000000000 RBX: ffff9479015ca600 RCX: ffffffffffffffed
[  220.373025] RDX: ffffffffffffffed RSI: ffff9479753dc980 RDI: 0000000000000000
[  220.373104] RBP: ffffb72b88c0f988 R08: 000000000001c980 R09: ffffffffc0ea6112
[  220.373184] R10: ffffef17477d9640 R11: ffff9479753dd6c0 R12: ffff9479211c7440
[  220.373264] R13: ffff9478f45b7790 R14: 0000000000000001 R15: ffff9479015ca600
[  220.373345] FS:  00007f555fa3e700(0000) GS:ffff9479753c0000(0000) knlGS:0000000000000000
[  220.373435] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  220.373506] CR2: 0000000000000065 CR3: 0000000196044000 CR4: 00000000000406e0
[  220.373586] Call Trace:
[  220.373627]  nfs4_ff_layout_prepare_ds+0x5e/0x200 [nfs_layout_flexfiles]
[  220.373708]  ff_layout_pg_init_read+0x81/0x160 [nfs_layout_flexfiles]
[  220.373806]  __nfs_pageio_add_request+0x11f/0x4a0 [nfs]
[  220.373886]  ? nfs_create_request.part.14+0x37/0x330 [nfs]
[  220.373967]  nfs_pageio_add_request+0xb2/0x260 [nfs]
[  220.374042]  readpage_async_filler+0xaf/0x280 [nfs]
[  220.374103]  read_cache_pages+0xef/0x1b0
[  220.374166]  ? nfs_read_completion+0x210/0x210 [nfs]
[  220.374239]  nfs_readpages+0x129/0x200 [nfs]
[  220.374293]  __do_page_cache_readahead+0x1d0/0x2f0
[  220.374352]  ondemand_readahead+0x17d/0x2a0
[  220.374403]  page_cache_sync_readahead+0x2e/0x50
[  220.374460]  generic_file_read_iter+0x6c8/0x950
[  220.374532]  ? nfs_mapping_need_revalidate_inode+0x17/0x40 [nfs]
[  220.374617]  nfs_file_read+0x6e/0xc0 [nfs]
[  220.374670]  __vfs_read+0xe2/0x150
[  220.374715]  vfs_read+0x96/0x130
[  220.374758]  SyS_read+0x55/0xc0
[  220.374801]  entry_SYSCALL_64_fastpath+0x1a/0xa9
[  220.374856] RIP: 0033:0x7f555f570bd0
[  220.374900] RSP: 002b:00007ffeb73e1b38 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[  220.374986] RAX: ffffffffffffffda RBX: 00007f555f839ae0 RCX: 00007f555f570bd0
[  220.375066] RDX: 0000000000020000 RSI: 00007f555fa41000 RDI: 0000000000000003
[  220.375145] RBP: 0000000000021010 R08: ffffffffffffffff R09: 0000000000000000
[  220.375226] R10: 00007f555fa40010 R11: 0000000000000246 R12: 0000000000022000
[  220.375305] R13: 0000000000021010 R14: 0000000000001000 R15: 0000000000002710
[  220.375386] Code: 66 66 90 55 48 89 e5 41 54 53 49 89 fc 48 83 ec 08 48 85 f6 74 2e 48 8b 4e 30 48 89 f3 48 81 f9 00 f0 ff ff 77 1e 48 85 c9 74 15 <48> 83 79 78 00 b8 01 00 00 00 74 2c 48 83 c4 08 5b 41 5c 5d c3
[  220.375653] RIP: ff_layout_mirror_valid+0x2d/0x110 [nfs_layout_flexfiles] RSP: ffffb72b88c0f970
[  220.375748] CR2: 0000000000000065
[  220.403538] ---[ end trace bcdca752211b7da9 ]---

Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-03-31 13:30:49 -04:00
..
9p Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
adfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
affs vfs: remove ".readlink = generic_readlink" assignments 2016-12-09 16:45:04 +01:00
afs Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
autofs4 Merge uncontroversial parts of branch 'readlink' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs 2016-12-17 19:16:12 -08:00
befs befs: add NFS export support 2016-12-22 11:25:24 +00:00
bfs Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
btrfs Merge branch 'for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2017-01-27 12:41:46 -08:00
cachefiles Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
ceph ceph: fix bad endianness handling in parse_reply_info_extra 2017-01-18 17:58:45 +01:00
cifs Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
coda vfs: remove ".readlink = generic_readlink" assignments 2016-12-09 16:45:04 +01:00
configfs Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
cramfs
crypto fscrypt: fix renaming and linking special files 2016-12-31 00:47:05 -05:00
debugfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
devpts Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
dlm ktime: Get rid of ktime_equal() 2016-12-25 17:21:23 +01:00
ecryptfs vfs: remove ".readlink = generic_readlink" assignments 2016-12-09 16:45:04 +01:00
efivarfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
efs Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
exofs exofs: don't mess with simple_write_{begin,end} 2016-12-10 14:25:19 -05:00
exportfs exportfs: be careful to only return expected errors. 2016-10-06 09:07:44 -04:00
ext2 dax: fix build warnings with FS_DAX and !FS_IOMAP 2017-01-24 16:26:14 -08:00
ext4 dax: fix build warnings with FS_DAX and !FS_IOMAP 2017-01-24 16:26:14 -08:00
f2fs block: Rename blk_queue_zone_size and bdev_zone_size 2017-01-12 07:58:32 -07:00
fat Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
freevxfs
fscache
fuse fuse: fix time_to_jiffies nsec sanity check 2017-01-13 17:20:47 +01:00
gfs2 ktime: Cleanup ktime_set() usage 2016-12-25 17:21:22 +01:00
hfs Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
hfsplus Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
hostfs vfs: remove ".readlink = generic_readlink" assignments 2016-12-09 16:45:04 +01:00
hpfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
hugetlbfs Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
isofs Merge branch 'for-4.10/block' of git://git.kernel.dk/linux-block 2016-12-13 10:19:16 -08:00
jbd2 Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
jffs2 vfs: remove ".readlink = generic_readlink" assignments 2016-12-09 16:45:04 +01:00
jfs Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
kernfs Merge uncontroversial parts of branch 'readlink' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs 2016-12-17 19:16:12 -08:00
lockd netns: make struct pernet_operations::id unsigned int 2016-11-18 10:59:15 -05:00
minix vfs: remove ".readlink = generic_readlink" assignments 2016-12-09 16:45:04 +01:00
ncpfs Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
nfs nfs: flexfiles: fix kernel OOPS if MDS returns unsupported DS type 2017-03-31 13:30:49 -04:00
nfs_common netns: make struct pernet_operations::id unsigned int 2016-11-18 10:59:15 -05:00
nfsd nfsd: fix supported attributes for acl & labels 2017-01-12 15:55:51 -05:00
nilfs2 Merge uncontroversial parts of branch 'readlink' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs 2016-12-17 19:16:12 -08:00
nls
notify Merge branch 'stable-4.10' of git://git.infradead.org/users/pcmoore/audit 2017-01-05 23:06:06 -08:00
ntfs Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
ocfs2 ocfs2: fix crash caused by stale lvb with fsdlm plugin 2017-01-10 18:31:54 -08:00
omfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
openpromfs Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
orangefs Merge uncontroversial parts of branch 'readlink' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs 2016-12-17 19:16:12 -08:00
overlayfs ovl: fix possible use after free on redirect dir lookup 2017-01-18 15:19:54 +01:00
proc proc: add a schedule point in proc_pid_readdir() 2017-01-24 16:26:14 -08:00
pstore Improvements and fixes to pstore subsystem: 2016-12-13 09:16:11 -08:00
qnx4
qnx6
quota Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs 2016-12-19 08:23:53 -08:00
ramfs Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
reiserfs Merge uncontroversial parts of branch 'readlink' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs 2016-12-17 19:16:12 -08:00
romfs romfs: use different way to generate fsid for BLOCK or MTD 2017-01-24 16:26:14 -08:00
squashfs Merge uncontroversial parts of branch 'readlink' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs 2016-12-17 19:16:12 -08:00
sysfs Merge branch 'for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2016-10-14 12:18:50 -07:00
sysv vfs: remove ".readlink = generic_readlink" assignments 2016-12-09 16:45:04 +01:00
tracefs fs: Replace CURRENT_TIME with current_time() for inode timestamps 2016-09-27 21:06:21 -04:00
ubifs ubifs: Fix journal replay wrt. xattr nodes 2017-01-17 14:35:58 +01:00
udf block,fs: untangle fs.h and blk_types.h 2016-11-01 09:43:26 -06:00
ufs Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
xfs xfs: prevent quotacheck from overloading inode lru 2017-01-27 09:32:30 -08:00
aio.c aio: fix lock dep warning 2017-01-14 19:31:40 -05:00
anon_inodes.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
attr.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
bad_inode.c bad_inode: add missing i_op initializers 2016-12-09 11:57:43 +01:00
binfmt_aout.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
binfmt_elf.c coredump: Ensure proper size of sparse core files 2017-01-14 19:32:40 -05:00
binfmt_elf_fdpic.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c fs: Replace current_fs_time() with current_time() 2016-09-27 21:06:22 -04:00
binfmt_script.c
block_dev.c block: fix use after free in __blkdev_direct_IO 2017-01-24 07:55:53 -07:00
buffer.c clean_bdev_aliases: Prevent cleaning blocks that are not in block range 2017-01-02 09:35:14 -07:00
char_dev.c
compat.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
compat_binfmt_elf.c
compat_ioctl.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
coredump.c coredump: Ensure proper size of sparse core files 2017-01-14 19:32:40 -05:00
dax.c dax: fix build warnings with FS_DAX and !FS_IOMAP 2017-01-24 16:26:14 -08:00
dcache.c mnt: Protect the mountpoint hashtable with mount_lock 2017-01-10 13:34:43 +13:00
dcookies.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
direct-io.c do_direct_IO: Use inode->i_blkbits to compute block count to be cleaned 2017-01-10 13:29:54 -07:00
drop_caches.c
eventfd.c
eventpoll.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
exec.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
fcntl.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
fhandle.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
file.c fs/file: more unsigned file descriptors 2016-09-27 18:47:38 -04:00
file_table.c constify alloc_file() 2016-12-05 19:01:16 -05:00
filesystems.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
fs-writeback.c fs/fs-writeback.c: remove redundant if check 2016-12-12 18:55:08 -08:00
fs_pin.c
fs_struct.c
inode.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
internal.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-12-17 18:44:00 -08:00
ioctl.c vfs: call vfs_clone_file_range() under freeze protection 2016-12-16 11:02:54 +01:00
iomap.c xfs: updates for 4.10-rc1 2016-12-14 21:35:31 -08:00
Kconfig dax: fix build warnings with FS_DAX and !FS_IOMAP 2017-01-24 16:26:14 -08:00
Kconfig.binfmt docs: fix locations of several documents that got moved 2016-10-24 08:12:35 -02:00
libfs.c libfs: Modify mount_pseudo_xattr to be clear it is not a userspace mount 2017-01-10 13:34:55 +13:00
locks.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
Makefile logfs: remove from tree 2016-12-14 23:48:11 -05:00
mbcache.c mbcache: document that "find" functions only return reusable entries 2016-12-03 15:55:01 -05:00
mount.h vfs: add path_is_mountpoint() helper 2016-12-03 20:51:35 -05:00
mpage.c fs: Add helper to clean bdev aliases under a bh and use it 2016-11-04 14:34:47 -06:00
namei.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
namespace.c mnt: Protect the mountpoint hashtable with mount_lock 2017-01-10 13:34:43 +13:00
no-block.c
nsfs.c net: add an ioctl to get a socket network namespace 2016-10-31 10:56:36 -04:00
open.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
pipe.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
pnode.c reorganize do_make_slave() 2016-12-16 16:30:49 -05:00
pnode.h mnt: Add a per mount namespace limit on the number of mounts 2016-09-30 12:46:48 -05:00
posix_acl.c tmpfs: clear S_ISGID when setting posix ACLs 2017-01-10 01:29:48 -05:00
proc_namespace.c
read_write.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
readdir.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
select.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
seq_file.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
signalfd.c
splice.c splice: reinstate SIGPIPE/EPIPE handling 2016-12-21 10:59:34 -08:00
stack.c
stat.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
statfs.c vfs: misc struct path constification 2016-12-05 19:03:49 -05:00
super.c quota: Remove dqonoff_mutex 2016-11-30 08:38:07 +01:00
sync.c
timerfd.c ktime: Cleanup ktime_set() usage 2016-12-25 17:21:22 +01:00
userfaultfd.c userfaultfd: fix SIGBUS resulting from false rwsem wakeups 2017-01-24 16:26:14 -08:00
utimes.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
xattr.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00