--- cut here ---
[  159.134668] Unab
[  159.134668] Unable to handle kernel NULL pointer dereference at virtual address 00000000 when write
[  159.134783] [00000000] *pgd=80000040204003, *pmd=00000000
[  159.135594] Internal error: Oops: a05 [#1] SMP ARM
[  159.137708] Modules linked in: test_vmalloc(+) fuse
[  159.138415] CPU: 0 UID: 0 PID: 1183 Comm: vmalloc_test/0 Tainted: G        W           6.15.0-rc6-next-20250512 #1 NONE 
[  159.139257] Tainted: [W]=WARN
[  159.139536] Hardware name: Generic DT based system
[  159.139882] PC is at vm_map_ram_test+0xcc/0xf0 [test_vmalloc]
[  159.140427] LR is at 0xfa331e60
[  159.140659] pc : [<bf02d5c8>]    lr : [<fa331e60>]    psr: 600f0013
[  159.141063] sp : fa331ee8  ip : edbd7e10  fp : c3f188e0
[  159.141542] r10: 0c2fd450  r9 : 00000061  r8 : c445dac0
[  159.141774] r7 : 00000001  r6 : bf02f014  r5 : 00000001  r4 : 00000001
[  159.142282] r3 : c4154e00  r2 : 00000000  r1 : 00000001  r0 : 00000000
[  159.142763] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
[  159.143456] Control: 30c5387d  Table: 43efe1c0  DAC: fffffffd
[  159.143955] Register r0 information: NULL pointer
[  159.144505] Register r1 information: non-paged memory
[  159.144703] Register r2 information: NULL pointer
[  159.145344] Register r3 information: slab task_struct start c4154e00 pointer offset 0 size 2496
[  159.146571] Register r4 information: non-paged memory
[  159.146948] Register r5 information: non-paged memory
[  159.147582] Register r6 information: 1-page vmalloc region starting at 0xbf02f000 allocated at load_module+0x7b0/0x1d00
[  159.148318] Register r7 information: non-paged memory
[  159.148474] Register r8 information: slab kmalloc-64 start c445dac0 pointer offset 0 size 64
[  159.148719] Register r9 information: non-paged memory
[  159.148872] Register r10 information: non-paged memory
[  159.149016] Register r11 information: slab kmalloc-192 start c3f18840 pointer offset 160 size 192
[  159.149270] Register r12 information: non-slab/vmalloc memory
[  159.149471] Process vmalloc_test/0 (pid: 1183, stack limit = 0x4d6fbf69)
[  159.150016] Stack: (0xfa331ee8 to 0xfa332000)
[  159.150799] 1ee0:                   c445dac0 c051a6d8 bf02d058 bf02d4fc 0000000a bf02f014
[  159.151638] 1f00: fa331f50 fa331f5c 00000000 bf02d6ec 313fbb20 00000000 c3f18840 00000025
[  159.152506] 1f20: bf031238 bf02f000 c248b980 a255718f 00000006 00000004 00000009 00000005
[  159.153371] 1f40: 00000000 00000002 00000008 0000000a 00000003 00000007 00000001 bdb53fc0
[  159.154029] 1f60: c3f18840 00000001 c42b1600 c4154e00 c42b1600 bf02d5ec c3f18840 00000000
[  159.154668] 1f80: 00000000 c048c56c 00000000 bdb53fc0 c4287440 c048c458 00000000 00000000
[  159.155624] 1fa0: 00000000 00000000 00000000 c0400254 00000000 00000000 00000000 00000000
[  159.156706] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  159.157170] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[  159.157474] Call trace: 
[  159.157607]  vm_map_ram_test [test_vmalloc] from test_func+0x100/0x2d8 [test_vmalloc]
[  159.158475]  test_func [test_vmalloc] from kthread+0x114/0x240
[  159.158970]  kthread from ret_from_fork+0x14/0x20
[  159.159357] Exception stack(0xfa331fb0 to 0xfa331ff8)
[  159.159749] 1fa0:                                     00000000 00000000 00000000 00000000
[  159.159971] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  159.160930] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[  159.161672] Code: e1a00008 e2844001 eb5a2aa0 e1a01005 (e5c09000) 
[  159.162700] ---[ end trace 0000000000000000 ]---

------------[ cut here ]------------
[   37.932892] WARNING: CPU: 1 PID: 582 at mm/highmem.c:622 kunmap_local_indexed+0x178/0x17c
[   37.935078] Modules linked in: fuse
[   37.935983] CPU: 1 UID: 0 PID: 582 Comm: uffd-unit-tests Not tainted 6.15.0-rc6-next-20250512 #1 NONE 
[   37.937125] Hardware name: Generic DT based system
[   37.937798] Call trace: 
[   37.938190]  unwind_backtrace from show_stack+0x18/0x1c
[   37.938524]  show_stack from dump_stack_lvl+0x6c/0x8c
[   37.938679]  dump_stack_lvl from __warn+0x84/0x130
[   37.938848]  __warn from warn_slowpath_fmt+0x18c/0x194
[   37.939047]  warn_slowpath_fmt from kunmap_local_indexed+0x178/0x17c
[   37.939230]  kunmap_local_indexed from move_pages+0x924/0x198c
[   37.939399]  move_pages from userfaultfd_ioctl+0x129c/0x2144
[   37.939562]  userfaultfd_ioctl from sys_ioctl+0x558/0xd24
[   37.939728]  sys_ioctl from ret_fast_syscall+0x0/0x1c
[   37.940203] Exception stack(0xf9f7dfa8 to 0xf9f7dff0)
[   37.940705] dfa0:                   00001000 00000000 00000005 c028aa05 b2dfecd8 b2dfecb0
[   37.941266] dfc0: 00001000 00000000 00000005 00000036 8010aa01 004a0000 b2dfed80 00000012
[   37.941544] dfe0: 00000036 b2dfec98 b6eb1861 b6e1f736
[   37.942024] ---[ end trace 0000000000000000 ]---

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