Fix verified on linux-image-4.13.0-39-generic/artful-proposed.

Thank you for the great work!

** Tags removed: verification-needed-artful
** Tags added: verification-done-artful

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https://bugs.launchpad.net/bugs/1734327

Title:
  Kernel panic on a nfsroot system

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Artful:
  Fix Committed

Bug description:
  == SRU Justification ==
  The following commit introduced a regression identified in bug 1734327:
  ac8f82a0b6d9 ("UBUNTU: SAUCE: LSM stacking: LSM: Infrastructure management of 
the remaining blobs")

  The regression causes a kernel panic to occur after multiple TCP connection 
  creations/closures to the localhost.  The bug was found using STAF RPC calls, 
  but is easily reproducible with SSH.

  A revert of commit ac8f82a0b6d9 is needed to resolve this bug.  However, 
commit 4ae2508f0bed
  also needs to be reverted because it depend on commit ac8f82a0b6d9.

  == Fix ==
  Revert 4ae2508f0bed ("UBUNTU: SAUCE: LSM stacking: add stacking support to 
apparmor network hooks")
  Revert ac8f82a0b6d9 ("UBUNTU: SAUCE: LSM stacking: LSM: Infrastructure 
management of the remaining blobs")

  == Test Case ==
  A test kernel was built with these two commits reverted and tested by the 
original bug reporter.
  The bug reporter states the test kernel resolved the bug.



  
  == Original Bug Description ==
  Summary:
  Kernel panic occurs after multiple TCP connection creations/closures to the 
localhost.
  The bug was found using STAF RPC calls, but is easily reproducible with SSH.
  The bug doesn't appear on an identical virtual machine booting from the disk.
  The bug is not reproducible on a similarly-prepared Ubuntu 16.04 machine.
  The bug is reproducible using an older 4.13.0-16-generic kernel
  Reproducible on multiple hardware types.
  Unable to create a kernel memory dump due to makedumpfile errors.
  apport-bug save attached.

  NFSRoot boot options:
  vmlinuz initrd=initrd.img boot=nfs root=/dev/nfs 
nfsroot=190.0.0.254:/diskless/host/u1616/Ubuntu/17.10 intel_iommu=on 
net.ifnames=0 biosdevname=0 apparmor=0 ip=:::::eth0:dhcp 
blacklist=i40e,ixgbe,fm10k crashkernel=384M-:768M rw

  Software:
  OS: Ubuntu 17.10
  Kernel: 4.13.0-17-generic x86_64

  Reproduction steps:
  1. Boot a system from a nfsroot
  2. Configure password-less localhost ssh access
  3. Run a loop: `while true; do ssh localhost 'uname -a'; done`
  4. Wait for system to crash

  Trace:
  4,1151,52372730,-;general protection fault: 0000 [#1] SMP
  4,1152,52372771,-;Modules linked in: arc4 md4 rpcsec_gss_krb5 nls_utf8 
auth_rpcgss cifs nfsv4 ccm ipmi_ssif intel_rapl sb_edac x86_pkg_temp_thermal 
intel_powerclamp coretemp intel_cstate mei_me input_leds joydev intel_rapl_perf 
mei kvm_intel lpc_ich ioatdma kvm irqbypass ipmi_si ipmi_devintf 
ipmi_msghandler shpchp acpi_pad acpi_power_meter mac_hid ib_iser rdma_cm iw_cm 
ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables 
x_tables autofs4 nfsv3 nfs_acl nfs lockd grace sunrpc fscache raid10 raid456 
async_raid6_recov async_memcpy async_pq async_xor async_tx xor hid_generic 
usbhid hid raid6_pq libcrc32c raid1 raid0 multipath linear uas usb_storage 
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc ast ttm aesni_intel igb 
drm_kms_helper aes_x86_64 crypto_simd syscopyarea glue_helper
  4,1153,52373251,c; sysfillrect dca cryptd sysimgblt i2c_algo_bit fb_sys_fops 
ahci ptp drm libahci pps_core wmi
  4,1154,52373322,-;CPU: 11 PID: 1848 Comm: STAFProc Not tainted 
4.13.0-17-generic #20-Ubuntu
  4,1155,52373371,-;Hardware name: Supermicro Super Server/X10SRD-F, BIOS 2.0 
12/17/2015
  4,1156,52373418,-;task: ffff9d09267f5d00 task.stack: ffffafddc3a70000
  4,1157,52373461,-;RIP: 0010:kfree+0x53/0x160
  4,1158,52373486,-;RSP: 0018:ffff9d092ecc3bc8 EFLAGS: 00010207
  4,1159,52373521,-;RAX: 0000000000000000 RBX: 241c894900000001 RCX: 
0000000000000004
  4,1160,52373566,-;RDX: 000032d49081cc08 RSI: 0000000000010080 RDI: 
000062fac0000000
  4,1161,52373611,-;RBP: ffff9d092ecc3be0 R08: 000000000001f4c0 R09: 
ffffffff943bb839
  4,1162,52373656,-;R10: 00904c7891000000 R11: 0000000000000000 R12: 
ffff9d09267ef000
  4,1163,52373701,-;R13: ffffffff93fa155e R14: ffff9d09267ef000 R15: 
ffff9d09267ef000
  4,1164,52373746,-;FS:  00007f3a53313700(0000) GS:ffff9d092ecc0000(0000) 
knlGS:0000000000000000
  4,1165,52373797,-;CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  4,1166,52373834,-;CR2: 00007fd5c9ffa780 CR3: 00000004666d7000 CR4: 
00000000003406e0
  4,1167,52373878,-;DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  4,1168,52373923,-;DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
  4,1169,52373968,-;Call Trace:
  4,1170,52373987,-; <IRQ>
  4,1171,52374009,-; security_sk_free+0x3e/0x50
  4,1172,52374042,-; __sk_destruct+0x108/0x190
  4,1173,52374070,-; sk_destruct+0x20/0x30
  4,1174,52374095,-; __sk_free+0x82/0xa0
  4,1175,52374120,-; sk_free+0x19/0x20
  4,1176,52374144,-; sock_put+0x14/0x20
  4,1177,52374168,-; tcp_v4_rcv+0x94d/0x9d0
  4,1178,52374195,-; ip_local_deliver_finish+0x5c/0x1f0
  4,1179,52374226,-; ip_local_deliver+0x6f/0xe0
  4,1180,52374254,-; ip_rcv_finish+0x120/0x410
  4,1181,52374281,-; ip_rcv+0x28c/0x3a0
  4,1182,52374305,-; ? update_load_avg+0x46d/0x590
  4,1183,52374335,-; __netif_receive_skb_core+0x39a/0xaa0
  4,1184,52374369,-; __netif_receive_skb+0x18/0x60
  4,1185,52374398,-; ? __netif_receive_skb+0x18/0x60
  4,1186,52374428,-; process_backlog+0x89/0x140
  4,1187,52374457,-; net_rx_action+0x13b/0x380
  4,1188,52374485,-; __do_softirq+0xde/0x2a5
  4,1189,52375837,-; do_softirq_own_stack+0x1c/0x30
  4,1190,52377188,-; </IRQ>
  4,1191,52378538,-; do_softirq.part.17+0x4e/0x50
  4,1192,52379869,-; __local_bh_enable_ip+0x5a/0x60
  4,1193,52381174,-; ip_finish_output2+0x172/0x3a0
  4,1194,52382442,-; ip_finish_output+0x190/0x250
  4,1195,52383658,-; ? ip_finish_output+0x190/0x250
  4,1196,52384833,-; ip_output+0x70/0xe0
  4,1197,52385959,-; ? lock_timer_base+0x81/0xa0
  4,1198,52387043,-; ip_local_out+0x35/0x40
  4,1199,52388078,-; ip_queue_xmit+0x160/0x3e0
  4,1200,52389068,-; ? __alloc_skb+0x87/0x1e0
  4,1201,52390019,-; tcp_transmit_skb+0x538/0x9e0
  4,1202,52390944,-; tcp_send_ack.part.35+0xbd/0x130
  4,1203,52391849,-; tcp_send_ack+0x16/0x20
  4,1204,52392729,-; tcp_cleanup_rbuf+0x67/0x100
  4,1205,52393600,-; tcp_recvmsg+0x572/0xb60
  4,1206,52394464,-; inet_recvmsg+0x4b/0xc0
  4,1207,52395307,-; sock_recvmsg+0x3d/0x50
  4,1208,52396135,-; sock_read_iter+0x90/0xe0
  4,1209,52396955,-; new_sync_read+0xde/0x130
  4,1210,52397766,-; __vfs_read+0x26/0x40
  4,1211,52398568,-; vfs_read+0x8e/0x130
  4,1212,52399347,-; SyS_read+0x55/0xc0
  4,1213,52400099,-; entry_SYSCALL_64_fastpath+0x1e/0xa9
  4,1214,52400845,-;RIP: 0033:0x7f3a58da0d5d
  4,1215,52401583,-;RSP: 002b:00007f3a53310e70 EFLAGS: 00000246 ORIG_RAX: 
0000000000000000
  4,1216,52402370,-;RAX: ffffffffffffffda RBX: 00007f3a44000078 RCX: 
00007f3a58da0d5d
  4,1217,52403153,-;RDX: 0000000000000020 RSI: 00007f3a4400b5f8 RDI: 
000000000000000f
  4,1218,52403952,-;RBP: 0000000000001010 R08: 0000000000000000 R09: 
0000000000000000
  4,1219,52404752,-;R10: 00007f3a593e4d20 R11: 0000000000000246 R12: 
00007f3a44000020
  4,1220,52405553,-;R13: 0000000000001000 R14: 00007f3a44000078 R15: 
0000000000000001
  4,1221,52406363,-;Code: 00 80 49 01 da 0f 82 1c 01 00 00 48 c7 c7 00 00 00 80 
48 2b 3d 7f e6 c1 00 49 01 fa 49 c1 ea 0c 49 c1 e2 06 4c 03 15 5d e6 c1 00 <49> 
8b 42 20 48 8d 50 ff a8 01 4c 0f 45 d2 49 8b 52 20 48 8d 42
  1,1222,52408171,-;RIP: kfree+0x53/0x160 RSP: ffff9d092ecc3bc8
  4,1223,52409129,-;---[ end trace f7b53e7f81a1cbda ]---
  0,1224,52414686,-;Kernel panic - not syncing: Fatal exception in interrupt
  ---
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Nov 24 12:39 seq
   crw-rw---- 1 root audio 116, 33 Nov 24 12:39 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.20.7-0ubuntu3.5
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 17.10
  InstallationDate: Installed on 2017-11-03 (21 days ago)
  InstallationMedia: Ubuntu-Server 17.10 "Artful Aardvark" - Release amd64 
(20171017.1)
  IwConfig: Error: [Errno 2] No such file or directory
  MachineType: Supermicro Super Server
  Package: linux (not installed)
  PciMultimedia:

  ProcFB: 0 astdrmfb
  ProcKernelCmdLine: vmlinuz initrd=initrd.img boot=nfs root=/dev/nfs 
nfsroot=190.0.0.254:/diskless/host/hostname/Ubuntu/17.10 intel_iommu=on 
net.ifnames=0 biosdevname=0 apparmor=0 ip=:::::eth0:dhcp 
blacklist=i40e,ixgbe,fm10k crashkernel=384M-:768M rw
  ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-17-generic N/A
   linux-backports-modules-4.13.0-17-generic  N/A
   linux-firmware                             1.169
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  artful
  Uname: Linux 4.13.0-17-generic x86_64
  UnreportableReason: The report belongs to a package that is not installed.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  _MarkForUpload: False
  dmi.bios.date: 12/17/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2.0
  dmi.board.asset.tag: Default string
  dmi.board.name: X10SRD-F
  dmi.board.vendor: Supermicro
  dmi.board.version: 1.01
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 17
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 0123456789
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr2.0:bd12/17/2015:svnSupermicro:pnSuperServer:pvr0123456789:rvnSupermicro:rnX10SRD-F:rvr1.01:cvnSupermicro:ct17:cvr0123456789:
  dmi.product.family: Default string
  dmi.product.name: Super Server
  dmi.product.version: 0123456789
  dmi.sys.vendor: Supermicro

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