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[  609.742614] Unable to handle kernel NULL pointer dereference at virtual address 00000000 when write
[  609.751800] [00000000] *pgd=80000080204003, *pmd=00000000
[  609.757263] Internal error: Oops: a05 [#1] SMP ARM
[  609.762084] Modules linked in: test_vmalloc(+) etnaviv gpu_sched snd_soc_simple_card snd_soc_simple_card_utils omapdrm ahci_dwc onboard_usb_dev snd_soc_tlv320aic3x_i2c snd_soc_tlv320aic3x snd_soc_davinci_mcasp snd_soc_ti_sdma snd_soc_ti_udma snd_soc_ti_edma snd_soc_core ac97_bus snd_pcm_dmaengine snd_pcm snd_timer snd soundcore ti_tpd12s015 omap_remoteproc display_connector nfnetlink ip_tables x_tables
[  609.797973] CPU: 0 UID: 0 PID: 1272 Comm: vmalloc_test/0 Tainted: G        W           6.15.0-next-20250603 #1 NONE 
[  609.808563] Tainted: [W]=WARN
[  609.811523] Hardware name: Generic DRA74X (Flattened Device Tree)
[  609.817657] PC is at vm_map_ram_test+0x98/0x4c0 [test_vmalloc]
[  609.823516] LR is at vm_map_ram+0x14c/0xa80
[  609.827728] pc : [<bf08cbd8>]    lr : [<c06a910c>]    psr: 200e0013
[  609.834014] sp : f2b29ef0  ip : f0380000  fp : 0000008d
[  609.839263] r10: f675c7cd  r9 : bf08e004  r8 : 00000001
[  609.844512] r7 : 00000061  r6 : 00000000  r5 : c6c7bc00  r4 : 00000001
[  609.851074] r3 : 600e0013  r2 : 000025dd  r1 : 00000001  r0 : 00000000
[  609.857635] Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
[  609.864807] Control: 30c5387d  Table: 842be340  DAC: fffffffd
[  609.870574] Register r0 information: NULL pointer
[  609.875305] Register r1 information: non-paged memory
[  609.880371] Register r2 information: non-paged memory
[  609.885467] Register r3 information: non-paged memory
[  609.890533] Register r4 information: non-paged memory
[  609.895599] Register r5 information: slab kmalloc-64 start c6c7bc00 pointer offset 0 size 64
[  609.904113] Register r6 information: NULL pointer
[  609.908843] Register r7 information: non-paged memory
[  609.913909] Register r8 information: non-paged memory
[  609.918975] Register r9 information: 1-page vmalloc region starting at 0xbf08e000 allocated at load_module+0xcf8/0x19c4
[  609.929809] Register r10 information: 1-page vmalloc region starting at 0xf675d000 allocated at kvfree_rcu_1_arg_vmalloc_test+0x2c/0x6c [test_vmalloc]
[  609.943359] Register r11 information: non-paged memory
[  609.948547] Register r12 information: 0-page vmalloc region starting at 0xf0380000 allocated at __devm_ioremap_resource+0x118/0x1f0
[  609.960418] Process vmalloc_test/0 (pid: 1272, stack limit = 0x66c4d0e4)
[  609.967163] Stack: (0xf2b29ef0 to 0xf2b2a000)
[  609.971527] 9ee0:                                     c6c7bc00 bf08c6b0 bf08cb40 c3c433c8
[  609.979766] 9f00: 00000000 c3c433cc 0000000a bf08e000 0000008d bf08c37c c38a8000 c3c433c0
[  609.987976] 9f20: 8d4fdf3b 83126e97 c3c433d0 00000009 00000000 00000007 00000006 00000001
[  609.996185] 9f40: 00000009 00000008 00000000 00000005 00000003 00000002 0000000a 00000004
[  610.004394] 9f60: f49eeb10 c38aa0d0 c2965400 c2965400 f2af1b38 bf08c100 c3c433c0 00000000
[  610.012603] 9f80: 00000000 c0493358 00000000 00000000 c5f1d140 c0493260 00000000 00000000
[  610.020812] 9fa0: 00000000 00000000 00000000 c040029c 00000000 00000000 00000000 00000000
[  610.029052] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  610.037261] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[  610.045471] Call trace: 
[  610.045471]  vm_map_ram_test [test_vmalloc] from test_func+0x27c/0x3c4 [test_vmalloc]
[  610.055877]  test_func [test_vmalloc] from kthread+0xf8/0x2d8
[  610.061676]  kthread from ret_from_fork+0x14/0x38
[  610.066406] Exception stack(0xf2b29fb0 to 0xf2b29ff8)
[  610.071472] 9fa0:                                     00000000 00000000 00000000 00000000
[  610.079681] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  610.087921] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[  610.094543] Code: e1a01004 e3e02000 eb5870fa e1a01004 (e5c07000) 
[  610.100708] ---[ end trace 0000000000000000 ]---

------------[ cut here ]------------
[  593.340515] WARNING: CPU: 0 PID: 682 at mm/highmem.c:622 kunmap_local_indexed+0x198/0x1a4
[  593.348815] Modules linked in: etnaviv gpu_sched snd_soc_simple_card snd_soc_simple_card_utils omapdrm ahci_dwc onboard_usb_dev snd_soc_tlv320aic3x_i2c snd_soc_tlv320aic3x snd_soc_davinci_mcasp snd_soc_ti_sdma snd_soc_ti_udma snd_soc_ti_edma snd_soc_core ac97_bus snd_pcm_dmaengine snd_pcm snd_timer snd soundcore ti_tpd12s015 omap_remoteproc display_connector nfnetlink ip_tables x_tables
[  593.383361] CPU: 0 UID: 0 PID: 682 Comm: uffd-unit-tests Not tainted 6.15.0-next-20250603 #1 NONE 
[  593.383361] Hardware name: Generic DRA74X (Flattened Device Tree)
[  593.383361] Call trace: 
[  593.383392]  unwind_backtrace from show_stack+0x10/0x14
[  593.383392]  show_stack from dump_stack_lvl+0x50/0x5c
[  593.383422]  dump_stack_lvl from __warn+0xd8/0x1e0
[  593.383422]  __warn from warn_slowpath_fmt+0xa8/0x174
[  593.383453]  warn_slowpath_fmt from kunmap_local_indexed+0x198/0x1a4
[  593.383453]  kunmap_local_indexed from move_pages_pte+0xd14/0xe34
[  593.383483]  move_pages_pte from move_pages+0x428/0x5bc
[  593.383483]  move_pages from userfaultfd_ioctl+0x900/0x1ec0
[  593.383483]  userfaultfd_ioctl from sys_ioctl+0xd24/0xd90
[  593.383514]  sys_ioctl from ret_fast_syscall+0x0/0x5c
[  593.383514] Exception stack(0xf26c1fa8 to 0xf26c1ff0)
[  593.383514] 1fa0:                   00001000 00000005 00000005 c028aa05 b2d1ecd8 b2d1ecc8
[  593.383544] 1fc0: 00001000 00000005 b2d1ece0 00000036 b2d1ed84 b2d1ed50 b2d1ed7c b2d1ed58
[  593.383544] 1fe0: 00000036 b2d1ecb0 b6dd1861 b6d3f736
[  593.383544] ---[ end trace 0000000000000000 ]---

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