[Bug 1833661] Re: Linux kernel oops on Malta board while accessing pflash

[Cleber Rosa]

When running
tests/acceptance/linux_ssh_mips_malta.py:LinuxSSH.test_mips_malta64el_kernel3_2_0,
I'm getting in roughly 8% of executions:

2019-09-18 22:37:43,665 linux_ssh_mips_m L0065 DEBUG| Intel/Sharp Extended 
Query Table at 0x0031
2019-09-18 22:37:43,668 linux_ssh_mips_m L0065 DEBUG| Using buffer write method
2019-09-18 22:37:45,722 linux_ssh_mips_m L0065 DEBUG| Searching for RedBoot 
partition table in physmap-flash.0 at offset 0x1003f0000
2019-09-18 22:37:46,287 linux_ssh_mips_m L0065 DEBUG| 
ESC[?25lESC[?1cESC7Creating 3 MTD partitions on "physmap-flash.0":
2019-09-18 22:37:46,287 linux_ssh_mips_m L0065 DEBUG| 
0x000000000000-0x000000100000 : "YAMON"
2019-09-18 22:37:46,314 linux_ssh_mips_m L0065 DEBUG| 
0x000000100000-0x0000003e0000 : "User FS"
2019-09-18 22:37:46,319 linux_ssh_mips_m L0065 DEBUG| 
0x0000003e0000-0x000000400000 : "Board Config"
2019-09-18 22:37:47,260 linux_ssh_mips_m L0065 DEBUG| ESC[1G[ESC[32m ok 
ESC[39;49mCPU 0 Unable to handle kernel paging request at virtual address 
0000000000000028, epc == ffffffffc00ed234, ra == ffffffffc00ed210
2019-09-18 22:37:47,262 linux_ssh_mips_m L0065 DEBUG| Oops[#1]:


And when running 
tests/acceptance/linux_ssh_mips_malta.py:LinuxSSH.test_mips_malta32eb_kernel3_2_0:

2019-09-19 00:02:47,151 linux_ssh_mips_m L0065 DEBUG| Searching for RedBoot 
partition table in physmap-flash.0 at offset 0x3f0000
2019-09-19 00:02:47,154 linux_ssh_mips_m L0065 DEBUG| No RedBoot partition 
table detected in physmap-flash.0
2019-09-19 00:02:47,847 linux_ssh_mips_m L0065 DEBUG| Creating 3 MTD partitions 
on "physmap-flash.0":
2019-09-19 00:02:47,850 linux_ssh_mips_m L0065 DEBUG| 
0x000000000000-0x000000100000 : "YAMON"
2019-09-19 00:02:47,875 linux_ssh_mips_m L0065 DEBUG| 
0x000000100000-0x0000003e0000 : "User FS"
2019-09-19 00:02:47,875 linux_ssh_mips_m L0065 DEBUG| 
0x0000003e0000-0x000000400000 : "Board Config"
2019-09-19 00:02:48,792 linux_ssh_mips_m L0065 DEBUG| ESC[?25lESC[?1cESC7CPU 0 
Unable to handle kernel paging request at virtual address 00000014,
 epc == c0205278, ra == c0205254
2019-09-19 00:02:48,794 linux_ssh_mips_m L0065 DEBUG| Oops[#1]:

** Changed in: qemu
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1833661

Title:
  Linux kernel oops on Malta board while accessing pflash

Status in QEMU:
  Confirmed

Bug description:
  commit 33d609990621dea6c7d056c86f707b8811320ac1

  While running tests/acceptance/linux_ssh_mips_malta.py, the big-endian
  tests fail:

    physmap-flash.0: Found 1 x32 devices at 0x0 in 32-bit bank. Manufacturer ID 
0x000000 Chip ID 0x000000
    Intel/Sharp Extended Query Table at 0x0031
    Using buffer write method
    Searching for RedBoot partition table in physmap-flash.0 at offset 
0x1003f0000
    Creating 3 MTD partitions on "physmap-flash.0":
    0x000000000000-0x000000100000 : "YAMON"
    0x000000100000-0x0000003e0000 : "User FS"
    0x0000003e0000-0x000000400000 : "Board Config"
    CPU 0 Unable to handle kernel paging request at virtual address 00000014

  The 64-bit test fails with:

    CPU 0 Unable to handle kernel paging request at virtual address
  0000000000000028

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