** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1831490

Title:
  kernel is out of memory and killed during a kernel sys_write operation

Status in apparmor package in Ubuntu:
  New
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  This error is being reproduced on i386 arch when using the pc-kernel
  snap from beta or candidate.

  > sudo snap install test-snapd-tools
  > dmesg

  [15131.806107] audit: type=1400 audit(1559585825.240:111193): 
apparmor="STATUS" operation="profile_replace" profile="unconfined" 
name="snap-update-ns.test-snapd-tools" pid=18240 comm="apparmor_parser"
  [15131.871610] vmap allocation for size 73728 failed: use vmalloc=<size> to 
increase size.
  [15131.871614] vmalloc: allocation failure: 68481 bytes
  [15131.871616] apparmor_parser: page allocation failure: order:0, 
mode:0x24000c2
  [15131.871619] CPU: 0 PID: 18242 Comm: apparmor_parser Not tainted 
4.4.0-150-generic #176-Ubuntu
  [15131.871620] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
1.10.2-1ubuntu1 04/01/2014
  [15131.871622]  c1b15967 5ed07e43 00000286 cfee9e00 c13c12ef c1a1ce6c 
00000001 cfee9e30
  [15131.871625]  c11821b6 c1a1b220 f40ba700 00000000 024000c2 cfee9e44 
c1a1ce6c cfee9e18
  [15131.871629]  5ed07e43 00010b81 00000000 cfee9e60 c11ba86f 024000c2 
00000000 c1a1ce6c
  [15131.871632] Call Trace:
  [15131.871637]  [<c13c12ef>] dump_stack+0x58/0x79
  [15131.871640]  [<c11821b6>] warn_alloc_failed+0xd6/0x110
  [15131.871643]  [<c11ba86f>] __vmalloc_node_range+0x1ef/0x210
  [15131.871645]  [<c11ba8f6>] __vmalloc_node+0x66/0x70
  [15131.871648]  [<c134f978>] ? __aa_kvmalloc+0x28/0x60
  [15131.871650]  [<c11ba978>] vmalloc+0x38/0x40
  [15131.871652]  [<c134f978>] ? __aa_kvmalloc+0x28/0x60
  [15131.871654]  [<c134f978>] __aa_kvmalloc+0x28/0x60
  [15131.871656]  [<c134a7f4>] aa_simple_write_to_buffer+0x34/0x90
  [15131.871658]  [<c134bf93>] policy_update+0x73/0x230
  [15131.871660]  [<c1314dce>] ? security_file_permission+0x3e/0xd0
  [15131.871662]  [<c134c1e8>] profile_replace+0x98/0xe0
  [15131.871664]  [<c134c150>] ? policy_update+0x230/0x230
  [15131.871666]  [<c11ec782>] __vfs_write+0x22/0x50
  [15131.871668]  [<c11eceac>] vfs_write+0x8c/0x1b0
  [15131.871669]  [<c11ed8a1>] SyS_write+0x51/0xb0
  [15131.871672]  [<c10038df>] do_fast_syscall_32+0x9f/0x190
  [15131.871675]  [<c17e80b0>] sysenter_past_esp+0x3d/0x61
  [15131.871676] Mem-Info:
  [15131.871679] active_anon:16802 inactive_anon:2068 isolated_anon:0
                  active_file:84472 inactive_file:25195 isolated_file:0
                  unevictable:0 dirty:34 writeback:0 unstable:0
                  slab_reclaimable:7222 slab_unreclaimable:14030
                  mapped:8431 shmem:5785 pagetables:204 bounce:0
                  free:289381 free_pcp:659 free_cma:0
  [15131.871685] DMA free:8848kB min:788kB low:984kB high:1180kB 
active_anon:636kB inactive_anon:0kB active_file:2720kB inactive_file:800kB 
unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15992kB 
managed:15916kB mlocked:0kB dirty:0kB writeback:0kB mapped:472kB shmem:308kB 
slab_reclaimable:484kB slab_unreclaimable:424kB kernel_stack:8kB pagetables:4kB 
unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB 
writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
  [15131.871686] lowmem_reserve[]: 0 834 1942 1942
  [15131.871692] Normal free:364440kB min:42432kB low:53040kB high:63648kB 
active_anon:30164kB inactive_anon:2776kB active_file:158404kB 
inactive_file:32020kB unevictable:0kB isolated(anon):0kB isolated(file):0kB 
present:897016kB managed:862444kB mlocked:0kB dirty:116kB writeback:0kB 
mapped:11176kB shmem:6332kB slab_reclaimable:28404kB slab_unreclaimable:55696kB 
kernel_stack:1040kB pagetables:348kB unstable:0kB bounce:0kB free_pcp:1336kB 
local_pcp:676kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 
all_unreclaimable? no
  [15131.871693] lowmem_reserve[]: 0 0 8863 8863
  [15131.871698] HighMem free:784236kB min:512kB low:14600kB high:28688kB 
active_anon:36408kB inactive_anon:5496kB active_file:176764kB 
inactive_file:67960kB unevictable:0kB isolated(anon):0kB isolated(file):0kB 
present:1134472kB managed:1134472kB mlocked:0kB dirty:20kB writeback:0kB 
mapped:22076kB shmem:16500kB slab_reclaimable:0kB slab_unreclaimable:0kB 
kernel_stack:0kB pagetables:464kB unstable:0kB bounce:0kB free_pcp:1300kB 
local_pcp:680kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 
all_unreclaimable? no
  [15131.871699] lowmem_reserve[]: 0 0 0 0
  [15131.871701] DMA: 12*4kB (UME) 10*8kB (UME) 7*16kB (ME) 5*32kB (UM) 2*64kB 
(U) 3*128kB (UM) 3*256kB (UM) 4*512kB (UME) 3*1024kB (ME) 1*2048kB (M) 0*4096kB 
= 8848kB
  [15131.871711] Normal: 87*4kB (UME) 106*8kB (UME) 168*16kB (UME) 195*32kB 
(UME) 135*64kB (UME) 161*128kB (ME) 120*256kB (ME) 61*512kB (UME) 25*1024kB 
(ME) 6*2048kB (M) 55*4096kB (M) = 364492kB
  [15131.871720] HighMem: 131*4kB (UM) 835*8kB (UM) 302*16kB (UM) 119*32kB (UM) 
95*64kB (UM) 50*128kB (UM) 67*256kB (UM) 55*512kB (UM) 52*1024kB (M) 23*2048kB 
(UM) 149*4096kB (M) = 784292kB
  [15131.871729] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 
hugepages_size=2048kB
  [15131.871730] 115450 total pagecache pages
  [15131.871731] 0 pages in swap cache
  [15131.871733] Swap cache stats: add 0, delete 0, find 0/0
  [15131.871734] Free swap  = 0kB
  [15131.871734] Total swap = 0kB
  [15131.871735] 511870 pages RAM
  [15131.871736] 283618 pages HighMem/MovableOnly
  [15131.871737] 8662 pages reserved
  [15131.871738] 0 pages cma reserved

  
  This the memory after the error:
  MemTotal:        2012832 kB
  MemFree:         1193308 kB
  MemAvailable:    1439592 kB
  Buffers:           86108 kB
  Cached:           374348 kB
  SwapCached:            0 kB
  Active:           373408 kB
  Inactive:         107024 kB
  Active(anon):      36500 kB
  Inactive(anon):     6608 kB
  Active(file):     336908 kB
  Inactive(file):   100416 kB
  Unevictable:           0 kB
  Mlocked:               0 kB
  HighTotal:       1134472 kB
  HighFree:         794836 kB
  LowTotal:         878360 kB
  LowFree:          398472 kB
  SwapTotal:             0 kB
  SwapFree:              0 kB
  Dirty:                36 kB
  Writeback:             0 kB
  AnonPages:         19992 kB
  Mapped:            25636 kB
  Shmem:             23140 kB
  Slab:              84460 kB
  SReclaimable:      28892 kB
  SUnreclaim:        55568 kB
  KernelStack:         936 kB
  PageTables:          668 kB
  NFS_Unstable:          0 kB
  Bounce:                0 kB
  WritebackTmp:          0 kB
  CommitLimit:     1006416 kB
  Committed_AS:     249728 kB
  VmallocTotal:     122880 kB
  VmallocUsed:           0 kB
  VmallocChunk:          0 kB
  AnonHugePages:         0 kB
  CmaTotal:              0 kB
  CmaFree:               0 kB
  HugePages_Total:       0
  HugePages_Free:        0
  HugePages_Rsvd:        0
  HugePages_Surp:        0
  Hugepagesize:       2048 kB
  DirectMap4k:      258040 kB
  DirectMap2M:      655360 kB
  --- 
  ApparmorStatusOutput: Error: [Errno 2] No such file or directory
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: i386
  DistroRelease: Ubuntu 16.04
  KernLog:
   
  NonfreeKernelModules: bnep bluetooth vxlan ip6_udp_tunnel udp_tunnel xt_nat 
xt_tcpudp iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat 
nf_conntrack ip6table_filter ip6_tables br_netfilter bridge stp llc arp_tables 
ipt_REJECT nf_reject_ipv4 xt_owner iptable_filter xt_hashlimit ip_tables 
x_tables veth tcp_diag inet_diag joydev ppdev kvm_intel kvm irqbypass 
input_leds parport_pc parport psmouse pata_acpi 8250_fintek i2c_piix4 serio_raw 
mac_hid autofs4 mmc_block sdhci_acpi sdhci_pci sdhci virtio_scsi usb_storage 
ahci libahci
  Package: linux
  PackageArchitecture: i386
  ProcKernelCmdline: BOOT_IMAGE=(loop)/kernel.img root=LABEL=writable 
snap_core=core_7122.snap snap_kernel=pc-kernel_222.snap ro net.ifnames=0 
init=/lib/systemd/systemd console=ttyS0 console=tty1 panic=-1
  ProcVersionSignature: Ubuntu 4.4.0-150.176-generic 4.4.179
  PstreeP: Error: [Errno 2] No such file or directory
  Syslog:
   
  Tags:  xenial uec-images
  Uname: Linux 4.4.0-150-generic i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True

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