comedi comedi3: 8255: I/O port conflict (0x40404f26,4) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee00008 when write [fee00008] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 7723 Comm: syz.1.1165 Not tainted 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 : [<813e8b00>] lr : [<813e8aec>] psr: 60000013 sp : df9b9cb8 ip : df9b9cb8 fp : df9b9cd4 r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00000005 r6 : 0000009b r5 : 84469cc0 r4 : 00000008 r3 : 0000009b r2 : fee00008 r1 : 00000001 r0 : 84469cc0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85f8e080 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84469cc0 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 84469cc0 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: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdf9b8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2608 Register r12 information: 2-page vmalloc region starting at 0xdf9b8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2608 Process syz.1.1165 (pid: 7723, stack limit = 0xdf9b8000) Stack: (0xdf9b9cb8 to 0xdf9ba000) 9ca0: 813e8aa0 84469cc0 9cc0: 00000005 00000005 df9b9cf4 df9b9cd8 813e87d8 813e8aac 00000005 80510e04 9ce0: 85eb2084 85eb2084 df9b9d14 df9b9cf8 813e8b98 813e878c 85eb2084 84469cc0 9d00: df9b9da8 00000005 df9b9d54 df9b9d18 813e8d8c 813e8b18 82af3088 84473080 9d20: 82821770 00000000 00000000 829d2a8c 84469cc0 84469d04 df9b9d90 84469cc0 9d40: 00000000 82b269a8 df9b9d8c df9b9d58 813d7cd8 813e8cdc 200000c0 00000000 9d60: df9b9d7c 200000c0 84469cc0 b5403587 200000c0 8398c800 40946400 00000003 9d80: df9b9e4c df9b9d90 813d3830 813d7bdc 35353238 00000000 00000000 00000000 9da0: 00000000 40404f26 00000005 00000002 0000d5db 0000000c 00000009 00000fff 9dc0: 5c95238c 0000000a 000003bf 00000802 00001600 00000005 20000001 00000809 9de0: 0400e1c8 00000006 00000007 00000006 00000199 00000006 00000004 0000000b 9e00: 00000402 00000010 00000003 000000ef 00000000 0000000a 08000003 dffffffd 9e20: 00000000 3972bd99 00000000 8606fcc0 84469cc0 200000c0 200000c0 8398c800 9e40: df9b9f14 df9b9e50 813d47fc 813d373c 00000000 00000000 00000000 3972bd99 9e60: 00000000 00000000 8249e5ec 0000005f 8413ac28 84469cf0 840d7e1c 8398c800 9e80: df9b9ee4 df9b9e90 807b2150 807a8674 00000064 00000001 00000000 df9b9eac 9ea0: 84d57610 834f2cc0 00006400 0000000b df9b9ea0 00000000 00000000 3972bd99 9ec0: 8606fcc0 40946400 200000c0 200000c0 8606fcc0 00000003 df9b9ef4 df9b9ee8 9ee0: 807b2270 3972bd99 df9b9f14 40946400 00000000 8606fcc1 200000c0 8606fcc0 9f00: 00000003 8398c800 df9b9fa4 df9b9f18 80580c68 813d422c ecac8b10 8398c800 9f20: df9b9f3c df9b9f30 81a76cd0 81a76ba0 df9b9f54 df9b9f40 8025b5c8 8028de04 9f40: df9b9fb0 40000000 df9b9f84 df9b9f58 802219ec 8025b584 00000000 8281d13c 9f60: df9b9fb0 0014c880 ecac8b10 80221940 00000000 3972bd99 df9b9fac 00000000 9f80: 00000000 00316310 00000036 8020029c 8398c800 00000036 00000000 df9b9fa8 9fa0: 80200060 80580b44 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76fd40bc 9fe0: 76fd3ec0 76fd3eb0 0001929c 00132320 60000010 00000003 00000000 00000000 Call trace: [<813e8aa0>] (subdev_8255_io) from [<813e87d8>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000005 r6:00000005 r5:84469cc0 r4:813e8aa0 [<813e8780>] (subdev_8255_do_config) from [<813e8b98>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813e8780>] (subdev_8255_do_config) from [<813e8b98>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85eb2084 [<813e8b0c>] (subdev_8255_io_init) from [<813e8d8c>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813e8b0c>] (subdev_8255_io_init) from [<813e8d8c>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00000005 r6:df9b9da8 r5:84469cc0 r4:85eb2084 [<813e8cd0>] (dev_8255_attach) from [<813d7cd8>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b269a8 r9:00000000 r8:84469cc0 r7:df9b9d90 r6:84469d04 r5:84469cc0 r4:829d2a8c [<813d7bd0>] (comedi_device_attach) from [<813d3830>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:8398c800 r7:200000c0 r6:b5403587 r5:84469cc0 r4:200000c0 [<813d3730>] (do_devconfig_ioctl) from [<813d47fc>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:8398c800 r7:200000c0 r6:200000c0 r5:84469cc0 r4:8606fcc0 [<813d4220>] (comedi_unlocked_ioctl) from [<80580c68>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813d4220>] (comedi_unlocked_ioctl) from [<80580c68>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813d4220>] (comedi_unlocked_ioctl) from [<80580c68>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813d4220>] (comedi_unlocked_ioctl) from [<80580c68>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:8398c800 r9:00000003 r8:8606fcc0 r7:200000c0 r6:8606fcc1 r5:00000000 r4:40946400 [<80580b38>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9b9fa8 to 0xdf9b9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76fd40bc 9fe0: 76fd3ec0 76fd3eb0 0001929c 00132320 r10:00000036 r9:8398c800 r8:8020029c r7:00000036 r6:00316310 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