8<--- cut here --- Unable to handle kernel paging request at virtual address fee00143 when write [fee00143] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6211 Comm: syz.3.480 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:99 [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 : [<814a2a04>] lr : [<814a29f0>] psr: 60000013 sp : df9ddcb8 ip : df9ddcb8 fp : df9ddcd4 r10: 00000140 r9 : 00000004 r8 : df9ddda4 r7 : 00000000 r6 : 0000009b r5 : 8315ad80 r4 : 00000143 r3 : 0000009b r2 : fee00143 r1 : 00000001 r0 : 8315ad80 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85c60d80 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8315ad80 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:1048 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 8315ad80 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: 2-page vmalloc region starting at 0xdf9dc000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdf9dc000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdf9dc000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.3.480 (pid: 6211, stack limit = 0xdf9dc000) Stack: (0xdf9ddcb8 to 0xdf9de000) dca0: 814a29a4 00000140 dcc0: 8315ad80 00000000 df9ddcf4 df9ddcd8 814a26e0 814a29b0 00000140 80546518 dce0: 8720d000 8720d000 df9ddd14 df9ddcf8 814a2a98 814a2694 8315ad80 00000000 dd00: 8720d000 00000000 df9ddd54 df9ddd18 814a2c48 814a2a1c ffffffff 00000004 dd20: 82a22dc0 00000000 00000000 82bd9660 8315ad80 00000000 df9ddd90 8315ad80 dd40: 00000000 82d30eac df9ddd8c df9ddd58 814915d0 814a2be0 40946400 00000000 dd60: df9ddd7c 200000c0 8315ad80 b5403587 40946400 00000001 00000003 860db100 dd80: df9dde4c df9ddd90 8148cdd4 814914d4 35353238 00000000 00000000 00000000 dda0: 00000000 00000140 00000020 00000009 00000002 10000007 00000001 00007fff ddc0: 30000002 00000007 0000c72d 00000000 00000007 00000003 00000008 00000029 dde0: 000072f0 00000101 00000006 00000006 00000401 00000004 00000006 0000a2d8 de00: 00000009 00001000 00000008 0000000a ffffffff 00000383 00008001 00000004 de20: 00000000 bd2627d3 00000000 85849100 8315ad80 200000c0 40946400 00000001 de40: df9ddf14 df9dde50 8148e0fc 8148cd14 00000000 bd2627d3 00000000 00000000 de60: 8254a844 df9ddea4 0000005f 841427b8 00000064 8315adb0 df9ddee4 df9dde88 de80: 8080692c 807fcfe4 00000064 00000001 00000000 df9ddea4 85a57d10 8342d088 dea0: 00006400 0000000b df9dde98 00000000 00000000 bd2627d3 00000000 85849100 dec0: 40946400 200000c0 200000c0 85849100 00000003 860db100 df9ddef4 df9ddee8 dee0: 80806a60 bd2627d3 df9ddf14 00000000 85849101 40946400 200000c0 85849100 df00: 00000003 860db100 df9ddfa4 df9ddf18 805bb23c 8148ddb4 ecac8b10 860db100 df20: df9ddf3c df9ddf30 81b5cd00 81b5cbcc df9ddf54 df9ddf40 8025a7a8 8028e490 df40: df9ddfb0 40000000 df9ddf84 df9ddf58 80220bdc 8025a764 00000000 82a1eb0c df60: df9ddfb0 0013eb70 ecac8b10 80220b30 00000000 bd2627d3 df9ddfac 00000000 df80: 00000000 00356310 00000036 8020029c 860db100 00000036 00000000 df9ddfa8 dfa0: 80200060 805bb004 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f4d0dc dfe0: 76f4ce88 76f4ce78 00018fa0 001309d0 60000010 00000003 00000000 00000000 Call trace: [<814a29a4>] (subdev_8255_io) from [<814a26e0>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8315ad80 r5:00000140 r4:814a29a4 [<814a2688>] (subdev_8255_do_config) from [<814a2a98>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814a2688>] (subdev_8255_do_config) from [<814a2a98>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8720d000 [<814a2a10>] (subdev_8255_io_init) from [<814a2c48>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814a2a10>] (subdev_8255_io_init) from [<814a2c48>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:8720d000 r5:00000000 r4:8315ad80 [<814a2bd4>] (dev_8255_attach) from [<814915d0>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30eac r9:00000000 r8:8315ad80 r7:df9ddd90 r6:00000000 r5:8315ad80 r4:82bd9660 [<814914c8>] (comedi_device_attach) from [<8148cdd4>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:860db100 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:8315ad80 r4:200000c0 [<8148cd08>] (do_devconfig_ioctl) from [<8148e0fc>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:200000c0 r5:8315ad80 r4:85849100 [<8148dda8>] (comedi_unlocked_ioctl) from [<805bb23c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148dda8>] (comedi_unlocked_ioctl) from [<805bb23c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148dda8>] (comedi_unlocked_ioctl) from [<805bb23c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148dda8>] (comedi_unlocked_ioctl) from [<805bb23c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:860db100 r9:00000003 r8:85849100 r7:200000c0 r6:40946400 r5:85849101 r4:00000000 [<805baff8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9ddfa8 to 0xdf9ddff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f4d0dc dfe0: 76f4ce88 76f4ce78 00018fa0 001309d0 r10:00000036 r9:860db100 r8:8020029c r7:00000036 r6:00356310 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