comedi comedi3: 8255: I/O port conflict (0xfffffffb,4) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee02169 when write [fee02169] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 23178 Comm: syz.1.19904 Not tainted 6.16.0-rc5-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 : [<813a4c50>] lr : [<813a4c3c>] psr: 60000013 sp : df9f5cc0 ip : df9f5cc0 fp : df9f5cdc r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00002166 r6 : 0000009b r5 : 8415ab40 r4 : 00002169 r3 : 0000009b r2 : fee02169 r1 : 00000001 r0 : 8415ab40 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8574a7c0 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8415ab40 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 8415ab40 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 0xdf9f4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdf9f4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.1.19904 (pid: 23178, stack limit = 0xdf9f4000) Stack: (0xdf9f5cc0 to 0xdf9f6000) 5cc0: 813a4bf0 8415ab40 00002166 00002166 df9f5cfc df9f5ce0 813a4928 813a4bfc 5ce0: 00002166 80507884 875f5084 875f5084 df9f5d1c df9f5d00 813a4ce8 813a48dc 5d00: 875f5084 8415ab40 df9f5db0 00002166 df9f5d5c df9f5d20 813a4edc 813a4c68 5d20: 829c5270 8415ab40 00000000 00000000 8415ab40 829c5270 8415ab40 00000000 5d40: df9f5d98 8415ab40 00000000 82b15078 df9f5d94 df9f5d60 81393e00 813a4e2c 5d60: 20000140 00000000 df9f5d84 20000140 8415ab40 b5403587 20000140 84052400 5d80: 40946400 00000003 df9f5e4c df9f5d98 8138fa90 81393d08 35353238 00000000 5da0: 00000000 00000000 00000000 fffffffb 00002166 00000002 00100000 000088d6 5dc0: 0000008f fffffffd 00100010 01000002 ffffffff 0000ab0f 00000008 00000006 5de0: 00000001 00000007 00000007 00000009 00000003 00000003 00000101 00000100 5e00: 00000003 00000080 00000006 0000000b 00000001 00005721 000007db 00000008 5e20: 00000000 00000000 00000000 f0c4706d 00000000 87353240 8415ab40 20000140 5e40: df9f5f14 df9f5e50 81390a44 8138f9c4 00000000 00000000 00000000 f0c4706d 5e60: 00000000 00000000 8246a3fc 0000005f 83cc5e58 8415ab70 841744d4 84052400 5e80: df9f5ee4 df9f5e90 80795a0c 8078bcfc 00000064 00000001 00000000 df9f5eac 5ea0: 85a15b50 834e5330 00006400 0000000b df9f5ea0 00000000 df9f5d30 f0c4706d 5ec0: 87353240 40946400 20000140 20000140 00000003 87353240 df9f5ef4 df9f5ee8 5ee0: 80795b2c f0c4706d df9f5f14 40946400 00000000 87353241 20000140 00000003 5f00: 87353240 84052400 df9f5fa4 df9f5f18 8056e2dc 81390474 ecac8b10 84052400 5f20: df9f5f3c df9f5f30 81a2cd48 81a2cc18 df9f5f54 df9f5f40 80261ffc 80293598 5f40: df9f5fb0 40000000 df9f5f84 df9f5f58 802229ec 80261fb8 00000000 8281d09c 5f60: df9f5fb0 0014c4a0 ecac8b10 80222940 00000000 f0c4706d df9f5fac 00000000 5f80: 00000000 002f6300 00000036 8020029c 84052400 00000036 00000000 df9f5fa8 5fa0: 80200060 8056e1b8 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b220bc 5fe0: 76b21ec0 76b21eb0 000193a4 00131f40 60000010 00000003 00000000 00000000 Call trace: [<813a4bf0>] (subdev_8255_io) from [<813a4928>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00002166 r6:00002166 r5:8415ab40 r4:813a4bf0 [<813a48d0>] (subdev_8255_do_config) from [<813a4ce8>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813a48d0>] (subdev_8255_do_config) from [<813a4ce8>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:875f5084 [<813a4c5c>] (subdev_8255_io_init) from [<813a4edc>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813a4c5c>] (subdev_8255_io_init) from [<813a4edc>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00002166 r6:df9f5db0 r5:8415ab40 r4:875f5084 [<813a4e20>] (dev_8255_attach) from [<81393e00>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r10:82b15078 r9:00000000 r8:8415ab40 r7:df9f5d98 r6:00000000 r5:8415ab40 r4:829c5270 [<81393cfc>] (comedi_device_attach) from [<8138fa90>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:84052400 r7:20000140 r6:b5403587 r5:8415ab40 r4:20000140 [<8138f9b8>] (do_devconfig_ioctl) from [<81390a44>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:20000140 r5:8415ab40 r4:87353240 [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:84052400 r9:87353240 r8:00000003 r7:20000140 r6:87353241 r5:00000000 r4:40946400 [<8056e1ac>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9f5fa8 to 0xdf9f5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b220bc 5fe0: 76b21ec0 76b21eb0 000193a4 00131f40 r10:00000036 r9:84052400 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