8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2a when write [fee04f2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6509 Comm: syz.0.577 Not tainted 6.16.0-rc7-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] PC is at subdev_8255_io+0x60/0x6c drivers/comedi/drivers/comedi_8255.c:43 LR is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] LR is at subdev_8255_io+0x4c/0x6c drivers/comedi/drivers/comedi_8255.c:43 pc : [<8139f1c0>] lr : [<8139f1ac>] psr: 60000013 sp : dfeb9cc0 ip : dfeb9cc0 fp : dfeb9cdc r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 83db5480 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 83db5480 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 859bbc00 DAC: 00000000 Register r0 information: slab kmalloc-192 start 83db5480 pointer offset 0 size 192 Register r1 information: non-paged memory Register r2 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 83db5480 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: non-paged memory Register r9 information: NULL pointer Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xdfeb8000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfeb8000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.0.577 (pid: 6509, stack limit = 0xdfeb8000) Stack: (0xdfeb9cc0 to 0xdfeba000) 9cc0: 8139f160 83db5480 00004f27 00004f27 dfeb9cfc dfeb9ce0 8139ee98 8139f16c 9ce0: 00004f27 80500f38 85be9000 85be9000 dfeb9d1c dfeb9d00 8139f258 8139ee4c 9d00: 85be9000 83db5480 dfeb9dac 00004f27 dfeb9d5c dfeb9d20 8139f44c 8139f1d8 9d20: 20000013 838eda80 82822670 00000000 00000000 829c53b0 83db5480 00000000 9d40: dfeb9d98 83db5480 00000000 82b14ef8 dfeb9d94 dfeb9d60 8138e35c 8139f39c 9d60: 200002c0 00000000 dfeb9d84 200002c0 83db5480 b5403587 200002c0 83a60c00 9d80: 40946400 00000003 dfeb9e4c dfeb9d98 81389f28 8138e264 35353238 00000000 9da0: 00000000 00000000 00000000 00004f27 00010003 00010000 0000007f 00000201 9dc0: 00000cca 00000eff 00000003 00000007 00000003 00000000 00000001 00000001 9de0: ffffffdc 00000006 0000e9cb 00000001 0001a449 0000000d 44000003 00000089 9e00: fffffffd 00000000 20001e46 00000008 00000e66 00000047 00000008 00000108 9e20: 00000001 fffffff8 00000000 a2afc591 00000000 85772f00 83db5480 200002c0 9e40: dfeb9f14 dfeb9e50 8138aedc 81389e5c 00000000 00000000 00000000 a2afc591 9e60: 00000000 00000000 824693fc 0000005f 83b9d058 83db54b0 840eb90c 83a60c00 9e80: dfeb9ee4 dfeb9e90 8078f7e4 80785ad4 00000064 00000001 00000000 dfeb9eac 9ea0: 85859490 8343bf68 00006400 0000000b dfeb9ea0 00000000 00000000 a2afc591 9ec0: 85772f00 40946400 200002c0 200002c0 00000003 85772f00 dfeb9ef4 dfeb9ee8 9ee0: 8078f904 a2afc591 dfeb9f14 40946400 00000000 85772f01 200002c0 00000003 9f00: 85772f00 83a60c00 dfeb9fa4 dfeb9f18 805679ec 8138a90c ecac8b10 83a60c00 9f20: dfeb9f3c dfeb9f30 81a24aec 81a249bc dfeb9f54 dfeb9f40 80261ffc 802935b0 9f40: dfeb9fb0 40000000 dfeb9f84 dfeb9f58 802229ec 80261fb8 00000000 8281d09c 9f60: dfeb9fb0 0014c520 ecac8b10 80222940 00000000 a2afc591 dfeb9fac 00000000 9f80: 00000000 002f6300 00000036 8020029c 83a60c00 00000036 00000000 dfeb9fa8 9fa0: 80200060 805678c8 00000000 00000000 00000003 40946400 200002c0 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b240bc 9fe0: 76b23ec0 76b23eb0 000193a4 00131fc0 60000010 00000003 00000000 00000000 Call trace: [<8139f160>] (subdev_8255_io) from [<8139ee98>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:83db5480 r4:8139f160 [<8139ee40>] (subdev_8255_do_config) from [<8139f258>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8139ee40>] (subdev_8255_do_config) from [<8139f258>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85be9000 [<8139f1cc>] (subdev_8255_io_init) from [<8139f44c>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<8139f1cc>] (subdev_8255_io_init) from [<8139f44c>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:dfeb9dac r5:83db5480 r4:85be9000 [<8139f390>] (dev_8255_attach) from [<8138e35c>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:999) r10:82b14ef8 r9:00000000 r8:83db5480 r7:dfeb9d98 r6:00000000 r5:83db5480 r4:829c53b0 [<8138e258>] (comedi_device_attach) from [<81389f28>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:83a60c00 r7:200002c0 r6:b5403587 r5:83db5480 r4:200002c0 [<81389e50>] (do_devconfig_ioctl) from [<8138aedc>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2156) r6:200002c0 r5:83db5480 r4:85772f00 [<8138a900>] (comedi_unlocked_ioctl) from [<805679ec>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8138a900>] (comedi_unlocked_ioctl) from [<805679ec>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<8138a900>] (comedi_unlocked_ioctl) from [<805679ec>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<8138a900>] (comedi_unlocked_ioctl) from [<805679ec>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:83a60c00 r9:85772f00 r8:00000003 r7:200002c0 r6:85772f01 r5:00000000 r4:40946400 [<805678bc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfeb9fa8 to 0xdfeb9ff0) 9fa0: 00000000 00000000 00000003 40946400 200002c0 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b240bc 9fe0: 76b23ec0 76b23eb0 000193a4 00131fc0 r10:00000036 r9:83a60c00 r8:8020029c r7:00000036 r6:002f6300 r5:00000000 r4:00000000 Code: e6ef3076 e0842002 e7f32052 e2422612 (e5c23000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e6ef3076 uxtb r3, r6 4: e0842002 add r2, r4, r2 8: e7f32052 ubfx r2, r2, #0, #20 c: e2422612 sub r2, r2, #18874368 @ 0x1200000 * 10: e5c23000 strb r3, [r2] <-- trapping instruction