comedi comedi3: 8255: I/O port conflict (0xfffffffb,4) comedi comedi3: 8255: I/O port conflict (0x80000002,4) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee00005 when write [fee00005] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 9062 Comm: syz.1.1292 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 : dfac1cc0 ip : dfac1cc0 fp : dfac1cdc r10: 00000002 r9 : 00000000 r8 : 00000084 r7 : 00000002 r6 : 0000009b r5 : 840e8000 r4 : 00000005 r3 : 0000009b r2 : fee00005 r1 : 00000001 r0 : 840e8000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84834b40 DAC: fffffffd Register r0 information: slab kmalloc-192 start 840e8000 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 840e8000 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 0xdfac0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfac0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.1.1292 (pid: 9062, stack limit = 0xdfac0000) Stack: (0xdfac1cc0 to 0xdfac2000) 1cc0: 813a4bf0 840e8000 00000002 00000002 dfac1cfc dfac1ce0 813a4928 813a4bfc 1ce0: 00000002 80507884 84901108 84901108 dfac1d1c dfac1d00 813a4ce8 813a48dc 1d00: 84901108 840e8000 dfac1db4 00000002 dfac1d5c dfac1d20 813a4edc 813a4c68 1d20: 20000013 84ef3e00 82822670 00000000 00000000 829c5270 840e8000 00000000 1d40: dfac1d98 840e8000 00000000 82b15078 dfac1d94 dfac1d60 81393e00 813a4e2c 1d60: 20000400 00000000 dfac1d84 20000400 840e8000 b5403587 20000400 85c2b000 1d80: 40946400 00000003 dfac1e4c dfac1d98 8138fa90 81393d08 35353238 00000000 1da0: 00000000 00000000 00000000 fffffffb 80000002 00000002 00100000 000088d7 1dc0: 0000008f fffffffd 0000000f 00000002 ffffffff 00000200 00000fff 00000344 1de0: 00000000 00000000 00000200 00000009 00000003 00000084 0000000e 00000000 1e00: 00000000 00000080 000007ff 00000004 ffffffff 0000b0c3 000807df 00000008 1e20: 000000f3 00000001 00000000 24be28c5 00000000 84e0e480 840e8000 20000400 1e40: dfac1f14 dfac1e50 81390a44 8138f9c4 00000000 00000000 00000000 24be28c5 1e60: 00000000 00000000 8246a3fc 0000005f 83ba3858 840e8030 8416651c 85c2b000 1e80: dfac1ee4 dfac1e90 80795a0c 8078bcfc 00000064 00000001 00000000 dfac1eac 1ea0: 84962550 83432880 00006400 0000000b dfac1ea0 00000000 00000000 24be28c5 1ec0: 84e0e480 40946400 20000400 20000400 00000003 84e0e480 dfac1ef4 dfac1ee8 1ee0: 80795b2c 24be28c5 dfac1f14 40946400 00000000 84e0e481 20000400 00000003 1f00: 84e0e480 85c2b000 dfac1fa4 dfac1f18 8056e2dc 81390474 ecac8b10 85c2b000 1f20: dfac1f3c dfac1f30 81a2cd08 81a2cbd8 dfac1f54 dfac1f40 80261ffc 80293598 1f40: dfac1fb0 40000000 dfac1f84 dfac1f58 802229ec 80261fb8 00000000 8281d09c 1f60: dfac1fb0 0014c4a0 ecac8b10 80222940 00000000 24be28c5 dfac1fac 00000000 1f80: 00000000 002f6300 00000036 8020029c 85c2b000 00000036 00000000 dfac1fa8 1fa0: 80200060 8056e1b8 00000000 00000000 00000003 40946400 20000400 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b570bc 1fe0: 76b56ec0 76b56eb0 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) r7:00000002 r6:00000002 r5:840e8000 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) r4:84901108 [<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) r7:00000002 r6:dfac1db4 r5:840e8000 r4:84901108 [<813a4e20>] (dev_8255_attach) from [<81393e00>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r10:82b15078 r9:00000000 r8:840e8000 r7:dfac1d98 r6:00000000 r5:840e8000 r4:829c5270 [<81393cfc>] (comedi_device_attach) from [<8138fa90>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:85c2b000 r7:20000400 r6:b5403587 r5:840e8000 r4:20000400 [<8138f9b8>] (do_devconfig_ioctl) from [<81390a44>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:20000400 r5:840e8000 r4:84e0e480 [<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) r10:85c2b000 r9:84e0e480 r8:00000003 r7:20000400 r6:84e0e481 r5:00000000 r4:40946400 [<8056e1ac>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfac1fa8 to 0xdfac1ff0) 1fa0: 00000000 00000000 00000003 40946400 20000400 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b570bc 1fe0: 76b56ec0 76b56eb0 000193a4 00131f40 r10:00000036 r9:85c2b000 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