--- cut here ---
[  251.942721] Unable to handle kernel NULL pointer dereference at virtual address 00000000 when write
[  251.942864] [00000000] *pgd=80000040204003, *pmd=00000000
[  251.943613] Internal error: Oops: a05 [#1] SMP ARM
[  251.945718] Modules linked in: test_vmalloc(+) nfnetlink ip_tables x_tables
[  251.946794] CPU: 0 UID: 0 PID: 1222 Comm: vmalloc_test/0 Tainted: G        W           6.16.0-rc2-next-20250616 #1 NONE 
[  251.947655] Tainted: [W]=WARN
[  251.947917] Hardware name: Generic DT based system
[  251.948307] PC is at vm_map_ram_test+0x98/0x4c0 [test_vmalloc]
[  251.948826] LR is at vm_map_ram+0x14c/0xa80
[  251.949202] pc : [<bf018bd8>]    lr : [<c06ab80c>]    psr: 200e0013
[  251.949688] sp : fa1e9ef0  ip : f1a80000  fp : 0000003a
[  251.950103] r10: a6ed7e50  r9 : bf01a01c  r8 : 00000001
[  251.950324] r7 : 00000061  r6 : 00000000  r5 : c48d6800  r4 : 00000001
[  251.950940] r3 : 600e0013  r2 : 000031fd  r1 : 00000001  r0 : 00000000
[  251.951582] Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
[  251.952211] Control: 30c5387d  Table: 44210e00  DAC: fffffffd
[  251.952509] Register r0 information: NULL pointer
[  251.953001] Register r1 information: non-paged memory
[  251.953220] Register r2 information: non-paged memory
[  251.953639] Register r3 information: non-paged memory
[  251.954135] Register r4 information: non-paged memory
[  251.954594] Register r5 information: slab kmalloc-64 start c48d6800 pointer offset 0 size 64
[  251.956116] Register r6 information: NULL pointer
[  251.956662] Register r7 information: non-paged memory
[  251.957118] Register r8 information: non-paged memory
[  251.957636] Register r9 information: 1-page vmalloc region starting at 0xbf01a000 allocated at load_module+0xcf8/0x19c4
[  251.958647] Register r10 information: non-paged memory
[  251.959104] Register r11 information: non-paged memory
[  251.959535] Register r12 information: 2-page vmalloc region starting at 0xf1a80000 allocated at copy_process+0x168/0xdb0
[  251.960404] Process vmalloc_test/0 (pid: 1222, stack limit = 0xe37150ab)
[  251.961362] Stack: (0xfa1e9ef0 to 0xfa1ea000)
[  251.961563] 9ee0:                                     c48d6800 bf018588 bf018b40 c408ea88
[  251.961855] 9f00: 00000000 c408ea8c 0000000a bf01a018 0000003a bf01837c c42de5c0 c408ea80
[  251.962292] 9f20: 8d4fdf3b 83126e97 c408ea90 00000008 8958764f 00000002 00000009 00000005
[  251.962950] 9f40: 00000007 00000003 00000004 00000001 00000008 0000000a 00000000 00000006
[  251.963734] 9f60: 0d165db8 c40e6ad0 c4221380 c4221380 fa205b38 bf018100 c408ea80 00000000
[  251.964589] 9f80: 00000000 c049325c 00000000 00000000 c4205900 c0493164 00000000 00000000
[  251.965314] 9fa0: 00000000 00000000 00000000 c040029c 00000000 00000000 00000000 00000000
[  251.966072] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  251.966719] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[  251.967440] Call trace: 
[  251.967688]  vm_map_ram_test [test_vmalloc] from test_func+0x27c/0x3c4 [test_vmalloc]
[  251.968450]  test_func [test_vmalloc] from kthread+0xf8/0x2d8
[  251.968984]  kthread from ret_from_fork+0x14/0x38
[  251.969449] Exception stack(0xfa1e9fb0 to 0xfa1e9ff8)
[  251.969858] 9fa0:                                     00000000 00000000 00000000 00000000
[  251.970137] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  251.970806] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[  251.971560] Code: e1a01004 e3e02000 eb5a4aba e1a01004 (e5c07000) 
[  251.973087] ---[ end trace 0000000000000000 ]---

------------[ cut here ]------------
[   91.244210] WARNING: mm/highmem.c:622 at kunmap_local_indexed+0x198/0x1a4, CPU#1: uffd-unit-tests/632
[   91.248201] Modules linked in: nfnetlink ip_tables x_tables
[   91.249894] CPU: 1 UID: 0 PID: 632 Comm: uffd-unit-tests Not tainted 6.16.0-rc2-next-20250616 #1 NONE 
[   91.250496] Hardware name: Generic DT based system
[   91.250936] Call trace: 
[   91.251308]  unwind_backtrace from show_stack+0x10/0x14
[   91.251901]  show_stack from dump_stack_lvl+0x50/0x5c
[   91.252347]  dump_stack_lvl from __warn+0xf0/0x1f8
[   91.252670]  __warn from warn_slowpath_fmt+0xa8/0x174
[   91.253172]  warn_slowpath_fmt from kunmap_local_indexed+0x198/0x1a4
[   91.253587]  kunmap_local_indexed from move_pages_pte+0xc40/0xf48
[   91.254047]  move_pages_pte from move_pages+0x488/0x680
[   91.254295]  move_pages from userfaultfd_ioctl+0x8e0/0x1dfc
[   91.254660]  userfaultfd_ioctl from sys_ioctl+0xd24/0xd90
[   91.254981]  sys_ioctl from ret_fast_syscall+0x0/0x5c
[   91.256361] Exception stack(0xf9d55fa8 to 0xf9d55ff0)
[   91.256873] 5fa0:                   00001000 00000005 00000005 c028aa05 b2deecd8 b2deecc8
[   91.257316] 5fc0: 00001000 00000005 b2deece0 00000036 b2deed84 b2deed50 b2deed7c b2deed58
[   91.257832] 5fe0: 00000036 b2deecb0 b6ea1861 b6e0f736
[   91.258985] ---[ end trace 0000000000000000 ]---

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