--- cut here ---
[  216.119141] Unable to handle kernel NULL pointer dereference at virtual address 00000000 when write
[  216.119273] [00000000] *pgd=80000040204003, *pmd=00000000
[  216.119894] Internal error: Oops: a05 [#1] SMP ARM
[  216.122373] Modules linked in: test_vmalloc(+) nfnetlink ip_tables x_tables
[  216.123161] CPU: 1 UID: 0 PID: 1221 Comm: vmalloc_test/0 Tainted: G        W           6.16.0-rc2-next-20250617 #1 NONE 
[  216.123872] Tainted: [W]=WARN
[  216.124068] Hardware name: Generic DT based system
[  216.124411] PC is at vm_map_ram_test+0x98/0x4c0 [test_vmalloc]
[  216.124969] LR is at vm_map_ram+0x14c/0xa80
[  216.125316] pc : [<bf018bd8>]    lr : [<c06ab80c>]    psr: 200e0013
[  216.125804] sp : fa229ef0  ip : f1880000  fp : 00000032
[  216.126199] r10: 50326010  r9 : bf01a01c  r8 : 00000001
[  216.126621] r7 : 00000061  r6 : 00000000  r5 : c4460c40  r4 : 00000001
[  216.127038] r3 : 600e0013  r2 : 0000364d  r1 : 00000001  r0 : 00000000
[  216.127611] Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[  216.128082] Control: 30c5387d  Table: 4396df40  DAC: 00000000
[  216.128548] Register r0 information: NULL pointer
[  216.129335] Register r1 information: non-paged memory
[  216.129774] Register r2 information: non-paged memory
[  216.130190] Register r3 information: non-paged memory
[  216.130579] Register r4 information: non-paged memory
[  216.131040] Register r5 information: slab kmalloc-64 start c4460c40 pointer offset 0 size 64
[  216.132146] Register r6 information: NULL pointer
[  216.132492] Register r7 information: non-paged memory
[  216.132938] Register r8 information: non-paged memory
[  216.133390] Register r9 information: 1-page vmalloc region starting at 0xbf01a000 allocated at load_module+0xcf8/0x19c4
[  216.134246] Register r10 information: non-paged memory
[  216.134680] Register r11 information: non-paged memory
[  216.135098] Register r12 information: 1-page vmalloc region starting at 0xf187f000 allocated at kvfree_rcu_1_arg_vmalloc_test+0x2c/0x6c [test_vmalloc]
[  216.136044] Process vmalloc_test/0 (pid: 1221, stack limit = 0x7c13d81e)
[  216.136884] Stack: (0xfa229ef0 to 0xfa22a000)
[  216.137217] 9ee0:                                     c4460c40 ffffffff bf018b40 c3fbe3c8
[  216.137760] 9f00: 00000000 c3fbe3cc 0000000a bf01a018 00000032 bf01837c c41d9280 c3fbe3c0
[  216.138320] 9f20: 8d4fdf3b 83126e97 c3fbe3d0 00000006 d4cbd1f2 00000004 00000002 00000006
[  216.138879] 9f40: 00000008 00000005 00000009 0000000a 00000003 00000001 00000007 00000000
[  216.139394] 9f60: 61e291fb c41d5850 c428eb80 c428eb80 fa235b38 bf018100 c3fbe3c0 00000000
[  216.139884] 9f80: 00000000 c049325c 00000000 00000000 c42b2b80 c0493164 00000000 00000000
[  216.140481] 9fa0: 00000000 00000000 00000000 c040029c 00000000 00000000 00000000 00000000
[  216.141021] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  216.141573] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[  216.142118] Call trace: 
[  216.142386]  vm_map_ram_test [test_vmalloc] from test_func+0x27c/0x3c4 [test_vmalloc]
[  216.143152]  test_func [test_vmalloc] from kthread+0xf8/0x2d8
[  216.143589]  kthread from ret_from_fork+0x14/0x38
[  216.143996] Exception stack(0xfa229fb0 to 0xfa229ff8)
[  216.144275] 9fa0:                                     00000000 00000000 00000000 00000000
[  216.144893] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  216.145376] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[  216.145980] Code: e1a01004 e3e02000 eb5a4aba e1a01004 (e5c07000) 
[  216.147753] ---[ end trace 0000000000000000 ]---

------------[ cut here ]------------
[   74.863329] WARNING: mm/highmem.c:622 at kunmap_local_indexed+0x198/0x1a4, CPU#1: uffd-unit-tests/631
[   74.867469] Modules linked in: nfnetlink ip_tables x_tables
[   74.870117] CPU: 1 UID: 0 PID: 631 Comm: uffd-unit-tests Not tainted 6.16.0-rc2-next-20250617 #1 NONE 
[   74.870741] Hardware name: Generic DT based system
[   74.872059] Call trace: 
[   74.872406]  unwind_backtrace from show_stack+0x10/0x14
[   74.873706]  show_stack from dump_stack_lvl+0x50/0x5c
[   74.874743]  dump_stack_lvl from __warn+0xf0/0x1f8
[   74.875307]  __warn from warn_slowpath_fmt+0xa8/0x174
[   74.876408]  warn_slowpath_fmt from kunmap_local_indexed+0x198/0x1a4
[   74.877281]  kunmap_local_indexed from move_pages_pte+0xc40/0xf48
[   74.877606]  move_pages_pte from move_pages+0x488/0x680
[   74.878600]  move_pages from userfaultfd_ioctl+0x8e0/0x1dfc
[   74.879352]  userfaultfd_ioctl from sys_ioctl+0xd24/0xd90
[   74.880113]  sys_ioctl from ret_fast_syscall+0x0/0x5c
[   74.881573] Exception stack(0xf9d99fa8 to 0xf9d99ff0)
[   74.882229] 9fa0:                   00001000 00000005 00000005 c028aa05 b2d0ecd8 b2d0ecc8
[   74.882830] 9fc0: 00001000 00000005 b2d0ece0 00000036 b2d0ed84 b2d0ed50 b2d0ed7c b2d0ed58
[   74.883300] 9fe0: 00000036 b2d0ecb0 b6dc1861 b6d2f736
[   74.884502] ---[ end trace 0000000000000000 ]---

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