[4.7.0rc6] Page Allocation Failures with dm-crypt

[Matthias Dahl <ml_linux-kernel@xxxxxxxxxxxxxxxx>]

Hello,

the following went to the linux-mm and linux-kernel lists as well
yesterday but for whatever reason, it never showed on dm-devel, so I
am re-sending it for the third time (and last time) and hoping for
the best that this time it works.

I am currently setting up a new machine (since my old one broke down)
and I ran into a lot of " Unable to allocate memory on node -1" warnings
while using dm-crypt. I have attached as much of the full log as I could
recover.

The encrypted device is sitting on a RAID10 (software raid, Intel Rapid
Storage). Kernel is 4.7.0rc6 as released.

Steps to reproduce are:

1)
cryptsetup -s 512 -d /dev/urandom -c aes-xts-plain64 open --type plain 
/dev/md126p5 test-device

2)
dd if=/dev/zero of=/dev/mapper/test-device status=progress bs=512K

While running, there are several allocation failure warnings issued to
the log. Doing the same on the device w/o dm-crypt in-between does not
cause any such warnings.

The machine did not crash or hang but the OOM killer got involved. With
that much of RAM and that very simple task, that should never have 
happened
in the first place, imho.

I tested all of this on a Fedora Rawhide Live Image as I currently still 
am
in the process of setting the new machine up. Those images are available
here to download:

download.fedoraproject.org/pub/fedora/linux/development/rawhide/Workstation/x86_64/iso/

The machine itself has 32 GiB of RAM (plenty), no swap (live image) and
is a 6700k on a Z170 chipset. The kernel, like I said, is the default
provided with the live image -- and in the version I tested, it was
the released 4.7.0rc6. No other tasks were running, except for the 
usual.

If there is anything I can do to help, please let me know.

Also, since I am not subscribed to the lists right now (I have to make 
due
with a crappy WebMail interface until everything is setup), please cc' 
me
accordingly. Thanks a lot.

With Kind Regards from Germany,
Matthias

--
Dipl.-Inf. (FH) Matthias Dahl | Software Engineer | binary-island.eu
 services: custom software [desktop, mobile, web], server administration

Personalities : [raid10] 
md126 : active raid10 sda[3] sdb[2] sdc[1] sdd[0]
      3907023872 blocks super external:/md127/0 64K chunks 2 near-copies [4/4] [UUUU]
      
md127 : inactive sdc[3](S) sdb[2](S) sda[1](S) sdd[0](S)
      10064 blocks super external:imsm
       
unused devices: <none>

nr_free_pages 7943696
nr_alloc_batch 5873
nr_inactive_anon 296
nr_active_anon 105347
nr_inactive_file 29921
nr_active_file 56980
nr_unevictable 13140
nr_mlock 2716
nr_anon_pages 107204
nr_mapped 27670
nr_file_pages 98500
nr_dirty 14
nr_writeback 0
nr_slab_reclaimable 8887
nr_slab_unreclaimable 16975
nr_page_table_pages 7137
nr_kernel_stack 490
nr_unstable 0
nr_bounce 0
nr_vmscan_write 9828326
nr_vmscan_immediate_reclaim 67360474
nr_writeback_temp 0
nr_isolated_anon 0
nr_isolated_file 0
nr_shmem 593
nr_dirtied 506466654
nr_written 506466595
nr_pages_scanned 0
numa_hit 5258670960
numa_miss 0
numa_foreign 0
numa_interleave 38217
numa_local 5258670960
numa_other 0
workingset_refault 336993
workingset_activate 61553
workingset_nodereclaim 7919435
nr_anon_transparent_hugepages 0
nr_free_cma 0
nr_dirty_threshold 1592267
nr_dirty_background_threshold 795161
pgpgin 10489537
pgpgout 2025884337
pswpin 0
pswpout 0
pgalloc_dma 684558
pgalloc_dma32 328009673
pgalloc_normal 5767713958
pgalloc_movable 0
pgfree 6106436104
pgactivate 813221
pgdeactivate 1284082
pgfault 1653795
pgmajfault 46351
pglazyfreed 0
pgrefill_dma 0
pgrefill_dma32 66114
pgrefill_normal 1407169
pgrefill_movable 0
pgsteal_kswapd_dma 0
pgsteal_kswapd_dma32 22181873
pgsteal_kswapd_normal 425875886
pgsteal_kswapd_movable 0
pgsteal_direct_dma 0
pgsteal_direct_dma32 10723905
pgsteal_direct_normal 45330060
pgsteal_direct_movable 0
pgscan_kswapd_dma 0
pgscan_kswapd_dma32 32470709
pgscan_kswapd_normal 758168190
pgscan_kswapd_movable 0
pgscan_direct_dma 0
pgscan_direct_dma32 55064390
pgscan_direct_normal 449388285
pgscan_direct_movable 0
pgscan_direct_throttle 16
zone_reclaim_failed 0
pginodesteal 329
slabs_scanned 75784518
kswapd_inodesteal 3324
kswapd_low_wmark_hit_quickly 18086579
kswapd_high_wmark_hit_quickly 562
pageoutrun 18100603
allocstall 739928
pgrotated 357590082
drop_pagecache 0
drop_slab 0
numa_pte_updates 0
numa_huge_pte_updates 0
numa_hint_faults 0
numa_hint_faults_local 0
numa_pages_migrated 0
pgmigrate_success 562476
pgmigrate_fail 34076511
compact_migrate_scanned 390290706
compact_free_scanned 17609026156
compact_isolated 37387419
compact_stall 17
compact_fail 10
compact_success 7
compact_daemon_wake 3013752
htlb_buddy_alloc_success 0
htlb_buddy_alloc_fail 0
unevictable_pgs_culled 69728
unevictable_pgs_scanned 0
unevictable_pgs_rescued 57566
unevictable_pgs_mlocked 62928
unevictable_pgs_munlocked 59182
unevictable_pgs_cleared 18
unevictable_pgs_stranded 18
thp_fault_alloc 0
thp_fault_fallback 0
thp_collapse_alloc 0
thp_collapse_alloc_failed 0
thp_split_page 0
thp_split_page_failed 0
thp_deferred_split_page 0
thp_split_pmd 0
thp_zero_page_alloc 0
thp_zero_page_alloc_failed 0
balloon_inflate 0
balloon_deflate 0
balloon_migrate 0

Attachment: crypto.txt.gz
Description: GNU Zip compressed data

Attachment: kernel.log.txt.gz
Description: GNU Zip compressed data

Attachment: sysctl.txt.gz
Description: GNU Zip compressed data

--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel