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: 10497 Comm: syz.1.1870 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 : dfc65cc0 ip : dfc65cc0 fp : dfc65cdc r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00002166 r6 : 0000009b r5 : 8412b480 r4 : 00002169 r3 : 0000009b r2 : fee02169 r1 : 00000001 r0 : 8412b480 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 838e2440 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8412b480 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 8412b480 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 0xdfc64000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfc64000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.1.1870 (pid: 10497, stack limit = 0xdfc64000) Stack: (0xdfc65cc0 to 0xdfc66000) 5cc0: 813a4bf0 8412b480 00002166 00002166 dfc65cfc dfc65ce0 813a4928 813a4bfc 5ce0: 00002166 80507874 84988684 84988684 dfc65d1c dfc65d00 813a4ce8 813a48dc 5d00: 84988684 8412b480 dfc65db0 00002166 dfc65d5c dfc65d20 813a4edc 813a4c68 5d20: 00000013 84aa0280 82822670 00000000 00000000 829c53f0 8412b480 00000000 5d40: dfc65d98 8412b480 00000000 82b15078 dfc65d94 dfc65d60 81393e00 813a4e2c 5d60: 20000140 00000000 dfc65d84 20000140 8412b480 b5403587 20000140 84cebc00 5d80: 40946400 00000003 dfc65e4c dfc65d98 8138fa90 81393d08 35353238 00000000 5da0: 00000000 00000000 00000000 fffffffb 00002166 00000000 00100000 000088d6 5dc0: 0000008f fffffffd 00000010 00000002 ffffffff 00000200 00000fff 00000344 5de0: 00000001 00000002 00000200 00000009 00000003 00000003 0000000e 00000004 5e00: 00000000 00000080 000007ff 00000001 00000001 0000b0c4 000007df 00000008 5e20: 000000f3 00000001 00000000 0db23508 00000000 85c12f00 8412b480 20000140 5e40: dfc65f14 dfc65e50 81390a44 8138f9c4 00000000 00000000 00000000 0db23508 5e60: 00000000 00000000 8246a3fc 0000005f 83ca0a58 8412b4b0 841a524c 84cebc00 5e80: dfc65ee4 dfc65e90 80795a14 8078bd04 00000064 00000001 00000000 dfc65eac 5ea0: 85b556d0 83432088 00006400 0000000b dfc65ea0 00000000 00000000 0db23508 5ec0: 85c12f00 40946400 20000140 20000140 00000003 85c12f00 dfc65ef4 dfc65ee8 5ee0: 80795b34 0db23508 dfc65f14 40946400 00000000 85c12f01 20000140 00000003 5f00: 85c12f00 84cebc00 dfc65fa4 dfc65f18 8056e2cc 81390474 ecac8b10 84cebc00 5f20: dfc65f3c dfc65f30 81a2cd48 81a2cc18 dfc65f54 dfc65f40 80261ffc 80293598 5f40: dfc65fb0 40000000 dfc65f84 dfc65f58 802229ec 80261fb8 00000000 8281d09c 5f60: dfc65fb0 0014c4a0 ecac8b10 80222940 00000000 0db23508 dfc65fac 00000000 5f80: 00000000 002f6300 00000036 8020029c 84cebc00 00000036 00000000 dfc65fa8 5fa0: 80200060 8056e1a8 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b1d0bc 5fe0: 76b1cec0 76b1ceb0 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 r5:8412b480 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) r4:84988684 [<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:dfc65db0 r5:8412b480 r4:84988684 [<813a4e20>] (dev_8255_attach) from [<81393e00>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r10:82b15078 r9:00000000 r8:8412b480 r7:dfc65d98 r6:00000000 r5:8412b480 r4:829c53f0 [<81393cfc>] (comedi_device_attach) from [<8138fa90>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:84cebc00 r7:20000140 r6:b5403587 r5:8412b480 r4:20000140 [<8138f9b8>] (do_devconfig_ioctl) from [<81390a44>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:20000140 r5:8412b480 r4:85c12f00 [<81390468>] (comedi_unlocked_ioctl) from [<8056e2cc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2cc>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2cc>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2cc>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:84cebc00 r9:85c12f00 r8:00000003 r7:20000140 r6:85c12f01 r5:00000000 r4:40946400 [<8056e19c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc65fa8 to 0xdfc65ff0) 5fa0: 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b1d0bc 5fe0: 76b1cec0 76b1ceb0 000193a4 00131f40 r10:00000036 r9:84cebc00 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