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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1370425

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

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https://bugs.launchpad.net/bugs/1370425

Title:
  kernel bug seen while try to use madvise system call with
  MADV_HWPOISON mode

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Problem Description
  ====================
  kernel bug seen while try to use madvise system call with MADV_HWPOISON mode
   
  ---uname output---
  Linux u10thp 3.16.0-9-generic #14-Ubuntu SMP Fri Aug 15 15:03:36 UTC 2014 ppc64le ppc64le ppc64le GNU/Linux
   
  Machine Type = Power 8 
   
  Steps to Reproduce
  ====================
  1.  Install Ubuntu 14.10 guest on PowerKVM.
  2.  Setup hugepage backing guest VM.
  3.  Try madv_poison.c code to test madvise sys. call with HWPOISON mode(test code is attached).
  	gcc -o madv_poison madv_poison.c
  	./madv_poison -C -i 1 		(1 - shm_test)

  Ubuntu 14.10 LE throws kernel bug :
  root@u10thp:~# ./madv_poison -C -i 1
  vm.memory_failure_early_kill = 0
  [pid 2301] start page-poisoning test
  [pid 2301] there are 1 shm_child
  [pid 2301] have spawned 1 processes
  [pid 2301] wait for Pid 2304
  [pid 2304] shm dirty poisoning page 0x3fffa7ce0000
  [ 7905.009001] Injecting memory failure for page 0xe6a7 at 0x3fffa7ce0000
  [ 7905.009359] MCE 0xe6a7: dirty LRU page recovery: Recovered
  [pid 2304] writing 2
  [ 7905.009901] ------------[ cut here ]------------
  [ 7905.010164] kernel BUG at /build/buildd/linux-3.16.0/arch/powerpc/mm/fault.c:180!
  [ 7905.010396] Oops: Exception in kernel mode, sig: 5 [#234]
  [ 7905.010438] SMP NR_CPUS=2048 NUMA pSeries
  [ 7905.010480] Modules linked in: pseries_rng rtc_generic ohci_pci
  [ 7905.010614] CPU: 0 PID: 2304 Comm: madv_poison Tainted: G      D       3.16.0-9-generic #14-Ubuntu
  [ 7905.010686] task: c0000000e0a92a60 ti: c0000000e09e8000 task.ti: c0000000e09e8000
  [ 7905.010746] NIP: c0000000009e3314 LR: c0000000009e2e54 CTR: 0000000000000000
  [ 7905.010864] REGS: c0000000e09eb990 TRAP: 0700   Tainted: G      D        (3.16.0-9-generic)
  [ 7905.010924] MSR: 8000000000029033 <SF,EE,ME,IR,DR,RI,LE>  CR: 28002882  XER: 00000000
  [ 7905.011125] CFAR: c0000000009e3170 SOFTE: 1 
  GPR00: c0000000009e2e54 c0000000e09ebc10 c0000000013742e0 0000000000000010 
  GPR04: c0000000e0b37ff8 00003fffa7ce0000 00000000000000a9 0000000000000000 
  GPR08: 0000000000000000 0000000000000010 c0000000e0a92a60 0000000000000020 
  GPR12: 0000000048002884 c00000000fe40000 0000000000000000 0000000000000000 
  GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
  GPR20: 00000000000000a9 0000000000000000 c0000000e0597a40 c0000000e022b060 
  GPR24: 0000000000000010 c0000000e022b000 c000000000009568 00003fffa7ce0000 
  GPR28: 0000000000000000 0000000000000000 0000000002000000 c0000000e09ebea0 
  [ 7905.012189] NIP [c0000000009e3314] do_page_fault+0x984/0x990
  [ 7905.012241] LR [c0000000009e2e54] do_page_fault+0x4c4/0x990
  [ 7905.012281] Call Trace:
  [ 7905.012361] [c0000000e09ebc10] [c0000000009e2e54] do_page_fault+0x4c4/0x990 (unreliable)
  [ 7905.012434] [c0000000e09ebe30] [c000000000009568] handle_page_fault+0x10/0x30
  [ 7905.012494] Instruction dump:
  [ 7905.012580] e92d0290 e8690460 38630060 4b7274d9 60000000 e93f0108 3bc00000 792a97e3 
  [ 7905.012683] 4082f77c 3bc00009 60000000 4bfff774 <0fe00000> 00000000 00000000 3c4c0099 
  [ 7905.012845] ---[ end trace a48a199a061eed79 ]---
  [ 7905.019084] 
  [pid 2301] Ins 0: Pid 2304: failed - shared memory test
  [pid 2301] 	!!! Page Poisoning Test is FAILED (1 failures found). !!!

  [pid 2301] page-poisoning test done!
  root@u10thp:~# 

  == Comment: #1 - Kalpana Shetty <kalshett@xxxxxxxxxx> -  ==
  The test code works fine with x86/Ubuntu VM so if it is not supported on power then it should have thrown an error not supported as it does with PowerKVM / RHEL 7 VM.

  Intel/Ubuntu 14.04 VM:			=================================> Working fine.
  root@u04vm14:~# ./madv_poison -C -i 1               (shm_test case)
  vm.memory_failure_early_kill = 0
  [pid 7325] start page-poisoning test
  [pid 7325] there are 1 shm_child
  [pid 7325] have spawned 1 processes
  [pid 7325] wait for Pid 7328
  [pid 7328] shm dirty poisoning page 0x7f60ca8ea000
  [pid 7328] writing 2
  [pid 7328] signal 7 code 4 addr 0x7f60ca8ea000
  [pid 7328] pass: recovered
  [pid 7325] Ins 0: Pid 7328: pass - shared memory test
  [pid 7325] 	!!! Page Poisoning Test got PASS. !!!

  [pid 7325] page-poisoning test done!

  PowerKVM / RHEL 7 VM:
  [root@rhel7-web-VM1 ~]# ./madv_poison -C -i 1
  sysctl: cannot stat /proc/sys/vm/memory_failure_early_kill: No such file or directory
  [pid 11512] start page-poisoning test
  [pid 11512] there are 1 shm_child
  [pid 11512] have spawned 1 processes
  [pid 11514] shm dirty poisoning page 0x3fff84d60000
  [pid 11512] wait for Pid 11514
  [pid 11514] failed: Kernel doesn't support poison injection ============================> unsupported error.
  [pid 11512] Ins 0: Pid 11514: failed - shared memory test
  [pid 11512] 	!!! Page Poisoning Test is FAILED (1 failures found). !!!

  [pid 11512] page-poisoning test done!

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