--- cut here ---
[  207.019987] Unable to handle kernel NULL pointer dereference at virtual address 00000000 when write
[  207.022459] [00000000] *pgd=80000040204003, *pmd=00000000
[  207.023262] Internal error: Oops: a05 [#1] SMP ARM
[  207.037268] Modules linked in: test_vmalloc(+) nfnetlink ip_tables x_tables
[  207.038199] CPU: 1 UID: 0 PID: 1169 Comm: vmalloc_test/0 Tainted: G        W           6.15.0-rc6-next-20250515 #1 NONE 
[  207.039170] Tainted: [W]=WARN
[  207.039420] Hardware name: Generic DT based system
[  207.039891] PC is at vm_map_ram_test+0x98/0x4c0 [test_vmalloc]
[  207.041412] LR is at vm_map_ram+0x14c/0xa80
[  207.041621] pc : [<bf018bd8>]    lr : [<c06a6934>]    psr: 20000013
[  207.042249] sp : fa1edef0  ip : c218b308  fp : 00000030
[  207.042810] r10: 31c66a50  r9 : bf01a004  r8 : 00000001
[  207.043003] r7 : 00000061  r6 : 00000000  r5 : c4888f00  r4 : 00000001
[  207.043489] r3 : 60000013  r2 : 00004887  r1 : 00000001  r0 : 00000000
[  207.045216] Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[  207.045586] Control: 30c5387d  Table: 43b2be40  DAC: 00000000
[  207.045788] Register r0 information: NULL pointer
[  207.047069] Register r1 information: non-paged memory
[  207.047276] Register r2 information: non-paged memory
[  207.047427] Register r3 information: non-paged memory
[  207.047600] Register r4 information: non-paged memory
[  207.047990] Register r5 information: slab kmalloc-64 start c4888f00 pointer offset 0 size 64
[  207.049071] Register r6 information: NULL pointer
[  207.049471] Register r7 information: non-paged memory
[  207.049866] Register r8 information: non-paged memory
[  207.050493] Register r9 information: 1-page vmalloc region starting at 0xbf01a000 allocated at load_module+0xcf8/0x19b8
[  207.051067] Register r10 information: non-paged memory
[  207.051301] Register r11 information: non-paged memory
[  207.051949] Register r12 information: non-slab/vmalloc memory
[  207.052884] Process vmalloc_test/0 (pid: 1169, stack limit = 0x69b5b918)
[  207.053775] Stack: (0xfa1edef0 to 0xfa1ee000)
[  207.054142] dee0:                                     c4888f00 ffffffff bf018b40 c3e79008
[  207.054459] df00: 00000000 c3e7900c 0000000a bf01a000 00000030 bf01837c c2a11280 c3e79000
[  207.054673] df20: 8d4fdf3b 83126e97 c3e79010 00000004 b3c9e4c2 00000004 00000000 00000007
[  207.054925] df40: 00000009 0000000a 00000003 00000002 00000005 00000001 00000008 00000006
[  207.055681] df60: 472f951d c2a12e40 c3f6bb00 c3f6bb00 fa1e9b38 bf018100 c3e79000 00000000
[  207.056394] df80: 00000000 c049332c 00000000 00000000 c3db7240 c0493238 00000000 00000000
[  207.057039] dfa0: 00000000 00000000 00000000 c040029c 00000000 00000000 00000000 00000000
[  207.057683] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  207.058211] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[  207.058908] Call trace: 
[  207.059154]  vm_map_ram_test [test_vmalloc] from test_func+0x27c/0x3c4 [test_vmalloc]
[  207.059831]  test_func [test_vmalloc] from kthread+0xf4/0x2d4
[  207.060346]  kthread from ret_from_fork+0x14/0x38
[  207.060528] Exception stack(0xfa1edfb0 to 0xfa1edff8)
[  207.060879] dfa0:                                     00000000 00000000 00000000 00000000
[  207.061536] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  207.062253] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
[  207.062946] Code: e1a01004 e3e02000 eb5a3704 e1a01004 (e5c07000) 
[  207.064395] ---[ end trace 0000000000000000 ]---