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

[Philippe Mathieu-Daudé]

Relevant 32-bit output:

tests/acceptance/linux_ssh_mips_malta.py:LinuxSSH.test_mips_malta32eb_kernel3_2_0

[   34.968000] Using buffer write method
[   38.324000] Searching for RedBoot partition table in physmap-flash.0 at 
offset 0x3f0000
[   38.328000] No RedBoot partition table detected in physmap-flash.0
[   39.032000] Creating 3 MTD partitions on "physmap-flash.0":
[   39.032000] 0x000000000000-0x000000100000 : "YAMON"
[   39.052000] 0x000000100000-0x0000003e0000 : "User FS"
[   39.068000] 0x0000003e0000-0x000000400000 : "Board Config"
[   40.924000] CPU 0 Unable to handle kernel paging request at virtual address 
00000014, epc == c0203278, ra == c0203254
[   40.932000] Oops[#1]:
[   40.932000] Cpu 0
[   40.932000] $ 0   : 00000000 1000a400 00000000 00000001
[   40.932000] $ 4   : c012f590 00000001 00000000 7fffffff
[   40.932000] $ 8   : 8fbcbfe0 0000a400 00000000 8fae0000
[   40.932000] $12   : 74646368 00000001 806c0078 61720053
[   40.932000] $16   : 8fb38000 8fba63c0 c0200000 00000001
[   40.932000] $20   : 00000000 c0205074 8020953c 7fac45e4
[   40.932000] $24   : 00000003 80338058                  
[   40.932000] $28   : 8fbca000 8fbcbcd0 00000008 c0203254
[   40.932000] Hi    : 00000009
[   40.932000] Lo    : 85d47900
[   40.932000] epc   : c0203278 mtd_open+0x94/0x1d0 [mtdchar]
[   40.932000]     Not tainted
[   40.932000] ra    : c0203254 mtd_open+0x70/0x1d0 [mtdchar]
[   40.932000] Status: 1000a403    KERNEL EXL IE 
[   40.932000] Cause : 10800008
[   40.932000] BadVA : 00000014
[   40.932000] PrId  : 00019300 (MIPS 24Kc)
[   40.932000] Modules linked in: mtdchar(+) redboot cfi_cmdset_0001 cfi_probe 
cfi_util gen_probe sg evdev uhci_hcd ehci_hcd physmap map_funcs chipreg usbcore 
mtd psmouse sr_mod i2c_piix4 i2c_core cdrom serio_raw usb_common
[   40.932000] Process mtd_probe (pid: 268, threadinfo=8fbca000, task=8fbbda88, 
tls=774b0490)
[   40.932000] Stack : 00000000 8e9b9470 8fba63c0 8e9b9470 802094b0 8e9ad980 
8e9b9470 8fba63c0
[   40.932000]         8e9ad980 802095d4 00000000 00000000 00000000 7fac45e4 
00000003 8033768c
[   40.932000]         8fba63c0 8f5a7518 8f811c80 8e9b9470 802094b0 00000000 
00000000 7fac45e4
[   40.932000]         00000008 80202bb4 8fbcbe14 8fbcbe68 8fbcbdc0 8f4f4498 
8f811c80 8fbcbe70
[   40.932000]         8fa29140 8fbcbe68 8e9b9470 00000024 00000000 00000000 
00000005 7fac45e4
[   40.932000]         ...
[   40.932000] Call Trace:
[   40.932000] [<c0203278>] mtd_open+0x94/0x1d0 [mtdchar]
[   40.932000] [<802095d4>] chrdev_open+0x124/0x250
[   40.932000] [<80202bb4>] __dentry_open+0x27c/0x3d8
[   40.932000] [<8020400c>] nameidata_to_filp+0x64/0x78
[   40.932000] [<80214160>] do_last.isra.17+0x3a4/0x81c
[   40.932000] [<802146d4>] path_openat+0xc0/0x4c4
[   40.932000] [<80214bf0>] do_filp_open+0x3c/0xac
[   40.932000] [<80204134>] do_sys_open+0x114/0x200
[   40.932000] [<8010a9d0>] stack_done+0x20/0x40
[   40.932000] 
[   40.932000] 
[   40.932000] Code: 3c02c013  3c02c020  8c425070 <8c440014> 3c028022  2442eef4 
 0040f809  02602821  10400043 
[   40.956000] ---[ end trace e666aa8cbfdf5c7f ]---
udevd[192]: 'mtd_probe /dev/.tmp-char-90:3'
[hang]

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

Title:
  Linux kernel oops on Malta board while accessing pflash

Status in QEMU:
  New

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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