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: 1 UID: 0 PID: 7155 Comm: syz.4.501 Not tainted 6.17.0-rc1-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 : [<813b8368>] lr : [<813b8354>] psr: 60000013 sp : dfabdcb8 ip : dfabdcb8 fp : dfabdcd4 r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00000005 r6 : 0000009b r5 : 841f3000 r4 : 00000008 r3 : 0000009b r2 : fee00008 r1 : 00000001 r0 : 841f3000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8575f980 DAC: 00000000 Register r0 information: slab kmalloc-192 start 841f3000 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 841f3000 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 0xdfabc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfabc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.4.501 (pid: 7155, stack limit = 0xdfabc000) Stack: (0xdfabdcb8 to 0xdfabe000) dca0: 813b8308 841f3000 dcc0: 00000005 00000005 dfabdcf4 dfabdcd8 813b8040 813b8314 00000005 80503bc0 dce0: 84f3e084 84f3e084 dfabdd14 dfabdcf8 813b8400 813b7ff4 84f3e084 841f3000 dd00: dfabdda8 00000005 dfabdd54 dfabdd18 813b85f4 813b8380 82ae3d60 84e83a00 dd20: 82821598 00000000 00000000 829d00c4 841f3000 841f3044 dfabdd90 841f3000 dd40: 00000000 82b16f00 dfabdd8c dfabdd58 813a74f8 813b8544 200000c0 00000000 dd60: dfabdd7c 200000c0 841f3000 b5403587 200000c0 8557d400 40946400 00000003 dd80: dfabde4c dfabdd90 813a3078 813a73fc 35353238 00000000 00000000 00000000 dda0: 00000000 40404f26 00000005 00000002 00000401 00000cf7 00000009 00000fff ddc0: 5c95239c 00000005 000003bf 00000802 00001600 00000001 20000001 00000009 dde0: 0000e1cb 00000006 0000002f 00000400 00000195 00000006 00000000 0000000b de00: 00000402 00000009 00000003 00000041 00000005 00000006 08000003 dffffffa de20: 00000000 19928e2d 00000000 84937a80 841f3000 200000c0 200000c0 8557d400 de40: dfabdf14 dfabde50 813a4044 813a2f84 00000000 00000000 00000000 19928e2d de60: 00000000 00000000 8247054c 0000005f 83c9ca58 841f3030 84119e1c 8557d400 de80: dfabdee4 dfabde90 807977b4 8078db18 00000064 00000001 00000000 dfabdeac dea0: 85d10910 83430198 00006400 0000000b dfabdea0 00000000 00000000 19928e2d dec0: 84937a80 40946400 200000c0 200000c0 84937a80 00000003 dfabdef4 dfabdee8 dee0: 807978d4 19928e2d dfabdf14 40946400 00000000 84937a81 200000c0 84937a80 df00: 00000003 8557d400 dfabdfa4 dfabdf18 8056cd88 813a3a74 ecac8b10 8557d400 df20: dfabdf3c dfabdf30 81a392b8 81a39188 dfabdf54 dfabdf40 8025e490 8028ef8c df40: dfabdfb0 40000000 dfabdf84 dfabdf58 802229ec 8025e44c 00000000 8281cddc df60: dfabdfb0 0014c820 ecac8b10 80222940 00000000 19928e2d dfabdfac 00000000 df80: 00000000 002f6308 00000036 8020029c 8557d400 00000036 00000000 dfabdfa8 dfa0: 80200060 8056cc64 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f4e0bc dfe0: 76f4dec0 76f4deb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813b8308>] (subdev_8255_io) from [<813b8040>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000005 r6:00000005 r5:841f3000 r4:813b8308 [<813b7fe8>] (subdev_8255_do_config) from [<813b8400>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813b7fe8>] (subdev_8255_do_config) from [<813b8400>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:84f3e084 [<813b8374>] (subdev_8255_io_init) from [<813b85f4>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813b8374>] (subdev_8255_io_init) from [<813b85f4>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00000005 r6:dfabdda8 r5:841f3000 r4:84f3e084 [<813b8538>] (dev_8255_attach) from [<813a74f8>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r10:82b16f00 r9:00000000 r8:841f3000 r7:dfabdd90 r6:841f3044 r5:841f3000 r4:829d00c4 [<813a73f0>] (comedi_device_attach) from [<813a3078>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:8557d400 r7:200000c0 r6:b5403587 r5:841f3000 r4:200000c0 [<813a2f78>] (do_devconfig_ioctl) from [<813a4044>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:8557d400 r7:200000c0 r6:200000c0 r5:841f3000 r4:84937a80 [<813a3a68>] (comedi_unlocked_ioctl) from [<8056cd88>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3a68>] (comedi_unlocked_ioctl) from [<8056cd88>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3a68>] (comedi_unlocked_ioctl) from [<8056cd88>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3a68>] (comedi_unlocked_ioctl) from [<8056cd88>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:8557d400 r9:00000003 r8:84937a80 r7:200000c0 r6:84937a81 r5:00000000 r4:40946400 [<8056cc58>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfabdfa8 to 0xdfabdff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f4e0bc dfe0: 76f4dec0 76f4deb0 0001948c 001322c0 r10:00000036 r9:8557d400 r8:8020029c r7:00000036 r6:002f6308 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