linux-sg2042/Documentation/features/debug
Aneesh Kumar K.V 675bceb097 powerpc/mm: Remove DEBUG_VM_PGTABLE support on powerpc
The test is broken w.r.t page table update rules and results in kernel
crash as below. Disable the support until we get the tests updated.

[   21.083519] kernel BUG at arch/powerpc/mm/pgtable.c:304!
cpu 0x0: Vector: 700 (Program Check) at [c000000c6d1e76c0]
    pc: c00000000009a5ec: assert_pte_locked+0x14c/0x380
    lr: c0000000005eeeec: pte_update+0x11c/0x190
    sp: c000000c6d1e7950
   msr: 8000000002029033
  current = 0xc000000c6d172c80
  paca    = 0xc000000003ba0000   irqmask: 0x03   irq_happened: 0x01
    pid   = 1, comm = swapper/0
kernel BUG at arch/powerpc/mm/pgtable.c:304!
[link register   ] c0000000005eeeec pte_update+0x11c/0x190
[c000000c6d1e7950] 0000000000000001 (unreliable)
[c000000c6d1e79b0] c0000000005eee14 pte_update+0x44/0x190
[c000000c6d1e7a10] c000000001a2ca9c pte_advanced_tests+0x160/0x3d8
[c000000c6d1e7ab0] c000000001a2d4fc debug_vm_pgtable+0x7e8/0x1338
[c000000c6d1e7ba0] c0000000000116ec do_one_initcall+0xac/0x5f0
[c000000c6d1e7c80] c0000000019e4fac kernel_init_freeable+0x4dc/0x5a4
[c000000c6d1e7db0] c000000000012474 kernel_init+0x24/0x160
[c000000c6d1e7e20] c00000000000cbd0 ret_from_kernel_thread+0x5c/0x6c

With DEBUG_VM disabled

[   20.530152] BUG: Kernel NULL pointer dereference on read at 0x00000000
[   20.530183] Faulting instruction address: 0xc0000000000df330
cpu 0x33: Vector: 380 (Data SLB Access) at [c000000c6d19f700]
    pc: c0000000000df330: memset+0x68/0x104
    lr: c00000000009f6d8: hash__pmdp_huge_get_and_clear+0xe8/0x1b0
    sp: c000000c6d19f990
   msr: 8000000002009033
   dar: 0
  current = 0xc000000c6d177480
  paca    = 0xc00000001ec4f400   irqmask: 0x03   irq_happened: 0x01
    pid   = 1, comm = swapper/0
[link register   ] c00000000009f6d8 hash__pmdp_huge_get_and_clear+0xe8/0x1b0
[c000000c6d19f990] c00000000009f748 hash__pmdp_huge_get_and_clear+0x158/0x1b0 (unreliable)
[c000000c6d19fa10] c0000000019ebf30 pmd_advanced_tests+0x1f0/0x378
[c000000c6d19fab0] c0000000019ed088 debug_vm_pgtable+0x79c/0x1244
[c000000c6d19fba0] c0000000000116ec do_one_initcall+0xac/0x5f0
[c000000c6d19fc80] c0000000019a4fac kernel_init_freeable+0x4dc/0x5a4
[c000000c6d19fdb0] c000000000012474 kernel_init+0x24/0x160
[c000000c6d19fe20] c00000000000cbd0 ret_from_kernel_thread+0x5c/0x6c
33:mon>

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200902040122.136414-1-aneesh.kumar@linux.ibm.com
2020-09-02 22:14:26 +10:00
..
KASAN arch: remove unicore32 port 2020-07-01 12:09:13 +03:00
debug-vm-pgtable powerpc/mm: Remove DEBUG_VM_PGTABLE support on powerpc 2020-09-02 22:14:26 +10:00
gcov-profile-all arch: remove unicore32 port 2020-07-01 12:09:13 +03:00
kcov Documentation/features: Remove unicore32 from kcov and kmemleak 2020-07-13 09:57:50 -06:00
kgdb It's been a busy cycle for documentation - hopefully the busiest for a 2020-08-04 22:47:54 -07:00
kmemleak Documentation/features: refresh RISC-V arch support files 2020-08-11 10:39:21 -06:00
kprobes arch: remove unicore32 port 2020-07-01 12:09:13 +03:00
kprobes-on-ftrace arch: remove unicore32 port 2020-07-01 12:09:13 +03:00
kretprobes arch: remove unicore32 port 2020-07-01 12:09:13 +03:00
optprobes arch: remove unicore32 port 2020-07-01 12:09:13 +03:00
stackprotector A handful of obvious fixes that wandered in during the merge window. 2020-08-13 13:57:45 -07:00
uprobes arch: remove unicore32 port 2020-07-01 12:09:13 +03:00
user-ret-profiler arch: remove unicore32 port 2020-07-01 12:09:13 +03:00