--- cut here ---
[  243.868723] Unable to handle kernel NULL pointer dereference at virtual address 00000000 when write
[  243.868807] [00000000] *pgd=80000040204003, *pmd=00000000
[  243.869676] Internal error: Oops: a05 [#1] SMP ARM
[  243.900727] Modules linked in: test_vmalloc(+) fuse
[  243.901929] CPU: 1 UID: 0 PID: 1221 Comm: vmalloc_test/0 Tainted: G        W           6.16.0-rc2-next-20250616 #1 NONE 
[  243.902859] Tainted: [W]=WARN
[  243.903687] Hardware name: Generic DT based system
[  243.904719] PC is at vm_map_ram_test+0xcc/0xf0 [test_vmalloc]
[  243.905156] LR is at 0xfa3b9e60
[  243.905565] pc : [<bf02d5c8>]    lr : [<fa3b9e60>]    psr: 60000013
[  243.906584] sp : fa3b9ee8  ip : edbeae50  fp : c441e520
[  243.906999] r10: c68dc860  r9 : 00000061  r8 : c2b615c0
[  243.907711] r7 : 00000001  r6 : bf02f000  r5 : 00000001  r4 : 00000001
[  243.908879] r3 : c44757c0  r2 : 00000000  r1 : 00000001  r0 : 00000000
[  243.909883] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[  243.910666] Control: 30c5387d  Table: 444ccac0  DAC: 00000000
[  243.911072] Register r0 information: NULL pointer
[  243.911625] Register r1 information: non-paged memory
[  243.911934] Register r2 information: NULL pointer
[  243.912194] Register r3 information: slab task_struct start c44757c0 pointer offset 0 size 2496
[  243.913822] Register r4 information: non-paged memory
[  243.914246] Register r5 information: non-paged memory
[  243.914646] Register r6 information: 1-page vmalloc region starting at 0xbf02f000 allocated at load_module+0x7b0/0x1d5c
[  243.915536] Register r7 information: non-paged memory
[  243.917036] Register r8 information: slab kmalloc-64 start c2b615c0 pointer offset 0 size 64
[  243.917691] Register r9 information: non-paged memory
[  243.918557] Register r10 information: non-slab/vmalloc memory
[  243.919431] Register r11 information: slab kmalloc-192 start c441e480 pointer offset 160 size 192
[  243.921140] Register r12 information: non-slab/vmalloc memory
[  243.922269] Process vmalloc_test/0 (pid: 1221, stack limit = 0x9ae428f9)
[  243.924193] Stack: (0xfa3b9ee8 to 0xfa3ba000)
[  243.924699] 9ee0:                   c2b615c0 c051b428 bf02d308 bf02d4fc 0000000a bf02f000
[  243.925951] 9f00: fa3b9f58 fa3b9f5c 00000000 bf02d6ec 00032380 00000000 c441e480 00000038
[  243.926652] 9f20: bf031238 bf02f400 c248b4a0 460473d6 00000008 00000002 00000007 00000009
[  243.927349] 9f40: 00000003 00000004 00000005 00000006 00000001 0000000a 00000000 4da347b3
[  243.928238] 9f60: c441e480 00000001 c440bf00 c44757c0 c440bf00 bf02d5ec c441e480 00000000
[  243.929437] 9f80: 00000000 c048c488 00000000 4da347b3 c3d9cb40 c048c374 00000000 00000000
[  243.929879] 9fa0: 00000000 00000000 00000000 c0400254 00000000 00000000 00000000 00000000
[  243.930718] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  243.931313] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[  243.932298] Call trace: 
[  243.932793]  vm_map_ram_test [test_vmalloc] from test_func+0x100/0x2d8 [test_vmalloc]
[  243.933709]  test_func [test_vmalloc] from kthread+0x114/0x240
[  243.934084]  kthread from ret_from_fork+0x14/0x20
[  243.934332] Exception stack(0xfa3b9fb0 to 0xfa3b9ff8)
[  243.934573] 9fa0:                                     00000000 00000000 00000000 00000000
[  243.935003] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  243.935575] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[  243.936245] Code: e1a00008 e2844001 eb5a39df e1a01005 (e5c09000) 
[  243.938753] ---[ end trace 0000000000000000 ]---

------------[ cut here ]------------
[   79.594895] WARNING: mm/highmem.c:622 at kunmap_local_indexed+0x178/0x17c, CPU#0: uffd-unit-tests/631
[   79.598125] Modules linked in: fuse
[   79.599985] CPU: 0 UID: 0 PID: 631 Comm: uffd-unit-tests Not tainted 6.16.0-rc2-next-20250616 #1 NONE 
[   79.601298] Hardware name: Generic DT based system
[   79.602584] Call trace: 
[   79.602876]  unwind_backtrace from show_stack+0x18/0x1c
[   79.603577]  show_stack from dump_stack_lvl+0x6c/0x8c
[   79.604129]  dump_stack_lvl from __warn+0x98/0x14c
[   79.605508]  __warn from warn_slowpath_fmt+0x18c/0x194
[   79.606025]  warn_slowpath_fmt from kunmap_local_indexed+0x178/0x17c
[   79.607199]  kunmap_local_indexed from move_pages+0x83c/0x19c8
[   79.608089]  move_pages from userfaultfd_ioctl+0x12d4/0x2070
[   79.609309]  userfaultfd_ioctl from sys_ioctl+0x558/0xd24
[   79.609754]  sys_ioctl from ret_fast_syscall+0x0/0x1c
[   79.611370] Exception stack(0xf9e25fa8 to 0xf9e25ff0)
[   79.611983] 5fa0:                   00001000 00000000 00000005 c028aa05 b2dbecd8 b2dbecb0
[   79.612822] 5fc0: 00001000 00000000 00000005 00000036 8010aa01 00470000 b2dbed80 00000012
[   79.613652] 5fe0: 00000036 b2dbec98 b6e71861 b6ddf736
[   79.615763] ---[ end trace 0000000000000000 ]---

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