--- cut here ---
[  365.696948] Unable to handle kernel NULL pointer dereference at virtual address 00000000 when write
[  365.697270] [00000000] *pgd=80000040204003, *pmd=00000000
[  365.698088] Internal error: Oops: a05 [#1] SMP ARM
[  365.722656] Modules linked in: test_vmalloc(+) fuse
[  365.725003] CPU: 1 UID: 0 PID: 1224 Comm: vmalloc_test/0 Tainted: G        W           6.16.0-rc3-next-20250623 #1 NONE 
[  365.725884] Tainted: [W]=WARN
[  365.726146] Hardware name: Generic DT based system
[  365.726837] PC is at vm_map_ram_test+0xcc/0xf0 [test_vmalloc]
[  365.727245] LR is at 0xfa3f1e60
[  365.727960] pc : [<bf02d5c8>]    lr : [<fa3f1e60>]    psr: 60010013
[  365.728203] sp : fa3f1ee8  ip : edbeae50  fp : c4401460
[  365.728361] r10: 239c31e0  r9 : 00000061  r8 : c46c53c0
[  365.728717] r7 : 00000001  r6 : bf02f000  r5 : 00000001  r4 : 00000001
[  365.729302] r3 : c2af8000  r2 : 00000000  r1 : 00000001  r0 : 00000000
[  365.729721] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[  365.730040] Control: 30c5387d  Table: 439cb280  DAC: 00000000
[  365.730516] Register r0 information: NULL pointer
[  365.731388] Register r1 information: non-paged memory
[  365.732786] Register r2 information: NULL pointer
[  365.733285] Register r3 information: slab task_struct start c2af8000 pointer offset 0 size 2496
[  365.734959] Register r4 information: non-paged memory
[  365.735364] Register r5 information: non-paged memory
[  365.735517] Register r6 information: 1-page vmalloc region starting at 0xbf02f000 allocated at load_module+0x7b0/0x1d5c
[  365.737139] Register r7 information: non-paged memory
[  365.737815] Register r8 information: slab kmalloc-64 start c46c53c0 pointer offset 0 size 64
[  365.738100] Register r9 information: non-paged memory
[  365.738528] Register r10 information: non-paged memory
[  365.738793] Register r11 information: slab kmalloc-192 start c44013c0 pointer offset 160 size 192
[  365.739539] Register r12 information: non-slab/vmalloc memory
[  365.740145] Process vmalloc_test/0 (pid: 1224, stack limit = 0x481e86f4)
[  365.741278] Stack: (0xfa3f1ee8 to 0xfa3f2000)
[  365.741677] 1ee0:                   c46c53c0 c051b6e0 bf02d464 bf02d4fc 0000000a bf02f000
[  365.742388] 1f00: fa3f1f50 fa3f1f5c 00000000 bf02d6ec 00019a00 00000000 c44013c0 00000055
[  365.742590] 1f20: bf031238 bf02f400 c248abe0 692fdea8 00000004 00000003 00000009 00000006
[  365.743571] 1f40: 00000008 00000002 00000000 0000000a 00000007 00000001 00000005 16171bf4
[  365.744137] 1f60: c44013c0 00000001 c417f300 c2af8000 c417f300 bf02d5ec c44013c0 00000000
[  365.744985] 1f80: 00000000 c048c460 00000000 16171bf4 c42a91c0 c048c34c 00000000 00000000
[  365.745320] 1fa0: 00000000 00000000 00000000 c0400254 00000000 00000000 00000000 00000000
[  365.745893] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  365.746686] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[  365.747276] Call trace: 
[  365.747536]  vm_map_ram_test [test_vmalloc] from test_func+0x100/0x2d8 [test_vmalloc]
[  365.748747]  test_func [test_vmalloc] from kthread+0x114/0x240
[  365.749130]  kthread from ret_from_fork+0x14/0x20
[  365.749792] Exception stack(0xfa3f1fb0 to 0xfa3f1ff8)
[  365.750225] 1fa0:                                     00000000 00000000 00000000 00000000
[  365.750721] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  365.751688] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[  365.752740] Code: e1a00008 e2844001 eb5a398a e1a01005 (e5c09000) 
[  365.755553] ---[ end trace 0000000000000000 ]---

------------[ cut here ]------------
[   85.201296] WARNING: mm/highmem.c:622 at kunmap_local_indexed+0x178/0x17c, CPU#0: uffd-unit-tests/634
[   85.203948] Modules linked in: fuse
[   85.205546] CPU: 0 UID: 0 PID: 634 Comm: uffd-unit-tests Not tainted 6.16.0-rc3-next-20250623 #1 NONE 
[   85.205943] Hardware name: Generic DT based system
[   85.206162] Call trace: 
[   85.206355]  unwind_backtrace from show_stack+0x18/0x1c
[   85.207816]  show_stack from dump_stack_lvl+0x6c/0x8c
[   85.208183]  dump_stack_lvl from __warn+0x98/0x14c
[   85.208715]  __warn from warn_slowpath_fmt+0x18c/0x194
[   85.209316]  warn_slowpath_fmt from kunmap_local_indexed+0x178/0x17c
[   85.209528]  kunmap_local_indexed from move_pages+0x83c/0x19c8
[   85.209886]  move_pages from userfaultfd_ioctl+0x12c8/0x2048
[   85.210274]  userfaultfd_ioctl from sys_ioctl+0x558/0xd24
[   85.210695]  sys_ioctl from ret_fast_syscall+0x0/0x1c
[   85.211177] Exception stack(0xf9fe5fa8 to 0xf9fe5ff0)
[   85.211738] 5fa0:                   00001000 00000000 00000005 c028aa05 b2e5ecd8 b2e5ecb0
[   85.212048] 5fc0: 00001000 00000000 00000005 00000036 8010aa01 00440000 b2e5ed80 00000012
[   85.212244] 5fe0: 00000036 b2e5ec98 b6f11861 b6e7f736
[   85.213216] ---[ end trace 0000000000000000 ]---

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