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: 10754 Comm: syz.6.1305 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 : [<813db898>] lr : [<813db884>] psr: 60000013 sp : dfb8dcb8 ip : dfb8dcb8 fp : dfb8dcd4 r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00000005 r6 : 0000009b r5 : 84057900 r4 : 00000008 r3 : 0000009b r2 : fee00008 r1 : 00000001 r0 : 84057900 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84a11980 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84057900 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 84057900 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 0xdfb8c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfb8c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.6.1305 (pid: 10754, stack limit = 0xdfb8c000) Stack: (0xdfb8dcb8 to 0xdfb8e000) dca0: 813db838 84057900 dcc0: 00000005 00000005 dfb8dcf4 dfb8dcd8 813db570 813db844 00000005 8050a88c dce0: 8499d084 8499d084 dfb8dd14 dfb8dcf8 813db930 813db524 8499d084 84057900 dd00: dfb8dda8 00000005 dfb8dd54 dfb8dd18 813dbb24 813db8b0 82af1fe0 86145080 dd20: 828215f0 00000000 00000000 829d23cc 84057900 84057944 dfb8dd90 84057900 dd40: 00000000 82b25910 dfb8dd8c dfb8dd58 813caa20 813dba74 200000c0 00000000 dd60: dfb8dd7c 200000c0 84057900 b5403587 200000c0 83b78c00 40946400 00000003 dd80: dfb8de4c dfb8dd90 813c656c 813ca924 35353238 00000000 00000000 00000000 dda0: 00000000 40404f26 00000005 00000002 0000d5db 0000000c 00000009 00000fff ddc0: 5c95238c 0000000a 000003bf 00000006 00001600 00000003 20000001 00000809 dde0: 0400e1c8 00000006 00000007 00000006 0000019c 00000006 00000004 0000000b de00: 00000402 00000010 00000003 000000ef 00000000 0000000a 08000003 dffffffd de20: 00000000 47c1c83f 00000000 8721cd80 84057900 200000c0 200000c0 83b78c00 de40: dfb8df14 dfb8de50 813c7538 813c6478 00000000 00000000 00000000 47c1c83f de60: 00000000 00000000 824625b4 0000005f 8411d018 84057930 841ecf3c 83b78c00 de80: dfb8dee4 dfb8de90 807a7cbc 8079e0b4 00000064 00000001 00000000 dfb8deac dea0: 85c2b9d0 83422b28 00006400 0000000b dfb8dea0 00000000 00000000 47c1c83f dec0: 8721cd80 40946400 200000c0 200000c0 8721cd80 00000003 dfb8def4 dfb8dee8 dee0: 807a7ddc 47c1c83f dfb8df14 40946400 00000000 8721cd81 200000c0 8721cd80 df00: 00000003 83b78c00 dfb8dfa4 dfb8df18 80578ee0 813c6f68 ecac8b10 83b78c00 df20: dfb8df3c dfb8df30 81a60dc0 81a60c90 dfb8df54 dfb8df40 8025c484 8028d914 df40: dfb8dfb0 40000000 dfb8df84 dfb8df58 802229ec 8025c440 00000000 8281cfb4 df60: dfb8dfb0 0014ced0 ecac8b10 80222940 00000000 47c1c83f dfb8dfac 00000000 df80: 00000000 00316308 00000036 8020029c 83b78c00 00000036 00000000 dfb8dfa8 dfa0: 80200060 80578dbc 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f2d0bc dfe0: 76f2cec0 76f2ceb0 0001928c 00132970 60000010 00000003 00000000 00000000 Call trace: [<813db838>] (subdev_8255_io) from [<813db570>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000005 r6:00000005 r5:84057900 r4:813db838 [<813db518>] (subdev_8255_do_config) from [<813db930>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813db518>] (subdev_8255_do_config) from [<813db930>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:8499d084 [<813db8a4>] (subdev_8255_io_init) from [<813dbb24>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813db8a4>] (subdev_8255_io_init) from [<813dbb24>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00000005 r6:dfb8dda8 r5:84057900 r4:8499d084 [<813dba68>] (dev_8255_attach) from [<813caa20>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:84057900 r7:dfb8dd90 r6:84057944 r5:84057900 r4:829d23cc [<813ca918>] (comedi_device_attach) from [<813c656c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83b78c00 r7:200000c0 r6:b5403587 r5:84057900 r4:200000c0 [<813c646c>] (do_devconfig_ioctl) from [<813c7538>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83b78c00 r7:200000c0 r6:200000c0 r5:84057900 r4:8721cd80 [<813c6f5c>] (comedi_unlocked_ioctl) from [<80578ee0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6f5c>] (comedi_unlocked_ioctl) from [<80578ee0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6f5c>] (comedi_unlocked_ioctl) from [<80578ee0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6f5c>] (comedi_unlocked_ioctl) from [<80578ee0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83b78c00 r9:00000003 r8:8721cd80 r7:200000c0 r6:8721cd81 r5:00000000 r4:40946400 [<80578db0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb8dfa8 to 0xdfb8dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f2d0bc dfe0: 76f2cec0 76f2ceb0 0001928c 00132970 r10:00000036 r9:83b78c00 r8:8020029c r7:00000036 r6:00316308 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