ARM64: kernel oops in 4.4-rc4+

[Ming Lei]

Hi,

The attached kernel oops can be triggered immediately after
running the following command on APM Mustang:

        $stress-ng --all 8 -t 10m

[1] kernel oops log
stress-ng: info:  [5220] 5 failures reached, aborting stress process
[  265.782659] kernel BUG at ./arch/arm64/include/asm/pgtable.h:282!
[  265.788726] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
[  265.794186] Modules linked in:
[  265.797241] CPU: 1 PID: 15830 Comm: stress-ng-cache Tainted: G
  W       4.4.0-rc4+ #54
[  265.805638] Hardware name: AppliedMicro Mustang/Mustang, BIOS 2.0.0
Oct 23 2015
[  265.812911] task: fffffe02c4795180 ti: fffffe02c4870000 task.ti:
fffffe02c4870000
[  265.820364] PC is at ptep_set_access_flags+0xdc/0x104
[  265.825395] LR is at handle_mm_fault+0xfe0/0x11e8
[  265.830077] pc : [<fffffe00001e39c0>] lr : [<fffffe00001d62b4>]
pstate: 20000145
[  265.837436] sp : fffffe02c4873c90
[  265.840733] x29: fffffe02c4873c90 x28: 00680047e20a0bd3
[  265.846042] x27: fffffe02c07cf780 x26: 000000000000ffe0
[  265.851352] x25: fffffe02c48e0000 x24: fffffe02c48c0000
[  265.856662] x23: 0000000000000054 x22: fffffe07dedc5400
[  265.861971] x21: fffffe02c12bab48 x20: 000003ff9f670000
[  265.867282] x19: 0000000000000001 x18: 0000000000000000
[  265.872593] x17: 0000000000474688 x16: 000003ff9f914258
[  265.877902] x15: 0012df030706601b x14: 000003ff9f862600
[  265.883211] x13: 00000003e8000000 x12: 0000000000000018
[  265.888519] x11: 0000000000000007 x10: fffffe02c4873b00
[  265.893828] x9 : 0000000000000000 x8 : fffffe02c4873c20
[  265.899138] x7 : fffffe00001d55ac x6 : 0000000000000000
[  265.904448] x5 : 0008000000000000 x4 : 00680047e20a0bd3
[  265.909759] x3 : 00680047e20a0fd3 x2 : fffffe02c48efb38
[  265.915070] x1 : 0008000000000000 x0 : 0008000000000080
[  265.920381]
[  265.921868] Process stress-ng-cache (pid: 15830, stack limit =
0xfffffe02c4870020)
[  265.929401] Stack: (0xfffffe02c4873c90 to 0xfffffe02c4874000)
[  265.935120] 3c80:
fffffe02c4873cd0 fffffe00001d62b4
[  265.942912] 3ca0: fffffe02c12bab48 000003ff9f670000
000000000000fb38 fffffe00001d5350
[  265.950703] 3cc0: fffffe02c12bab48 fffffe00001d55ac
fffffe02c4873db0 fffffe00000a2e90
[  265.958495] 3ce0: fffffe02c4873ed0 fffffe02c4795180
fffffe07dedc5400 000000009200000b
[  265.966288] 3d00: 000003ff9f6723b6 0000000000000007
0000000000000054 fffffe02c12bab48
[  265.974080] 3d20: fffffe07dedc5498 0000000000020000
fffffe02c4873da0 fffffe0000110af4
[  265.981872] 3d40: fffffe02c48efb38 fffffe02c4795180
fffffe02c4873d80 fffffe00000f0394
[  265.989664] 3d60: fffffe0000aaca00 fffffe02c48cffe0
0000000000000000 000000009200000b
[  265.997456] 3d80: fffffe02c4873db0 fffffe00000a2ed4
fffffe02c4873db0 fffffe00000a2d6c
[  266.005248] 3da0: fffffe02c4873ed0 fffffe02c4795180
fffffe02c4873e20 fffffe00000902c8
[  266.013040] 3dc0: 000000009200000b fffffe0000cd60f0
000003ff9f6723b6 fffffe02c4873ed0
[  266.020832] 3de0: 0000000020000000 0000000000000024
000000009200000b 000003ff9f6723b6
[  266.028624] 3e00: 0000000000000001 fffffe02c4870000
0000000000000001 fffffe00000944d4
[  266.036416] 3e20: 000003ffc104a160 fffffe000009391c
0000000000000000 000003ff9f79d7a0
[  266.044209] 3e40: ffffffffffffffff 00000000004128f0
ffffffffffffffff 0000000000412900
[  266.052001] 3e60: 0000000020000000 fffffe0000097cb0
fffffe02c4873e90 fffffe00000944d4
[  266.059793] 3e80: fffffe02c4796180 fffffe02c4796300
fffffe02c4873eb0 fffffe0000097cb0
[  266.067585] 3ea0: 0000000000000008 000003ff9f79d7a0
000003ffc104a160 fffffe0000093ba8
[  266.075377] 3ec0: 0000000000000000 fffffe0000093a98
00000000000e23b6 0000000000000001
[  266.083169] 3ee0: 000000000000010d 00000000001d9e3c
0000000000000008 00000000000003e8
[  266.090960] 3f00: 000003ff9fb20000 0000000000475ae0
000000000011dc49 0000000000008001
[  266.098752] 3f20: 0000000000007504 0000000000000007
0000000000000018 00000003e8000000
[  266.106544] 3f40: 000003ff9f862600 0012df030706601b
000003ff9f914258 0000000000474688
[  266.114336] 3f60: 0000000000000000 000003ff9f590000
000003ff9f79d7a0 0000000000009069
[  266.122128] 3f80: 0000000000004650 0000000000475ae0
00000000220d97ab 00000000001fffff
[  266.129919] 3fa0: 000003ffc104a1e8 0000000000000001
0000000000475698 000003ffc104a160
[  266.137712] 3fc0: 0000000000412850 000003ffc104a160
00000000004128f0 0000000020000000
[  266.145504] 3fe0: 0000000000000000 ffffffffffffffff
6b6b6b6b6b6b6b6b a56b6b6b6b6b6b6b
[  266.153295] Call trace:
[  266.155732] [<fffffe00001e39c0>] ptep_set_access_flags+0xdc/0x104
[  266.161799] [<fffffe00001d62b4>] handle_mm_fault+0xfe0/0x11e8
[  266.167519] [<fffffe00000a2e90>] do_page_fault+0x200/0x324
[  266.172979] [<fffffe00000902c8>] do_mem_abort+0x40/0xa0
[  266.178170] Exception stack(0xfffffe02c4873e30 to 0xfffffe02c4873f50)
[  266.184578] 3e20:
0000000000000000 000003ff9f79d7a0
[  266.192370] 3e40: ffffffffffffffff 00000000004128f0
ffffffffffffffff 0000000000412900
[  266.200162] 3e60: 0000000020000000 fffffe0000097cb0
fffffe02c4873e90 fffffe00000944d4
[  266.207954] 3e80: fffffe02c4796180 fffffe02c4796300
fffffe02c4873eb0 fffffe0000097cb0
[  266.215746] 3ea0: 0000000000000008 000003ff9f79d7a0
000003ffc104a160 fffffe0000093ba8
[  266.223538] 3ec0: 0000000000000000 fffffe0000093a98
00000000000e23b6 0000000000000001
[  266.231329] 3ee0: 000000000000010d 00000000001d9e3c
0000000000000008 00000000000003e8
[  266.239121] 3f00: 000003ff9fb20000 0000000000475ae0
000000000011dc49 0000000000008001
[  266.246913] 3f20: 0000000000007504 0000000000000007
0000000000000018 00000003e8000000
[  266.254705] 3f40: 000003ff9f862600 0012df030706601b
[  266.259561] [<fffffe000009391c>] el0_da+0x18/0x1c
[  266.264244] Code: 8a000060 d2e00101 eb01001f 54fffb60 (d4210000)
[  266.270370] ---[ end trace 9db51a647dfce800 ]---