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: 15686 Comm: syz.2.2992 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 : [<813dbc68>] lr : [<813dbc54>] psr: 60000013 sp : e0081cb8 ip : e0081cb8 fp : e0081cd4 r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00000005 r6 : 0000009b r5 : 840a7780 r4 : 00000008 r3 : 0000009b r2 : fee00008 r1 : 00000001 r0 : 840a7780 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 849a57c0 DAC: 00000000 Register r0 information: slab kmalloc-192 start 840a7780 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 840a7780 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 0xe0080000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xe0080000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.2.2992 (pid: 15686, stack limit = 0xe0080000) Stack: (0xe0081cb8 to 0xe0082000) 1ca0: 813dbc08 840a7780 1cc0: 00000005 00000005 e0081cf4 e0081cd8 813db940 813dbc14 00000005 8050a7fc 1ce0: 85567084 85567084 e0081d14 e0081cf8 813dbd00 813db8f4 85567084 840a7780 1d00: e0081da8 00000005 e0081d54 e0081d18 813dbef4 813dbc80 82af1fe0 84226280 1d20: 828215f0 00000000 00000000 829d23cc 840a7780 840a77c4 e0081d90 840a7780 1d40: 00000000 82b25910 e0081d8c e0081d58 813cadec 813dbe44 200000c0 00000000 1d60: e0081d7c 200000c0 840a7780 b5403587 200000c0 83ad6000 40946400 00000003 1d80: e0081e4c e0081d90 813c6938 813cacf0 35353238 00000000 00000000 00000000 1da0: 00000000 40404f26 00000005 00000002 000f0000 0000000c 00000009 00000fff 1dc0: 5c95238c 0000000a 000003bf 00000802 00001600 00000005 20000001 00000809 1de0: 0400e1c8 00000006 00000007 00000402 00000199 00000006 00000004 0000000b 1e00: 00000402 00000000 00000003 000000ef 00000000 0000000a 08000003 dffffffd 1e20: 00000000 021e2cde 00000000 85bb5480 840a7780 200000c0 200000c0 83ad6000 1e40: e0081f14 e0081e50 813c7904 813c6844 00000000 00000000 00000000 021e2cde 1e60: 00000000 00000000 824625b4 0000005f 84202250 840a77b0 840e0c6c 83ad6000 1e80: e0081ee4 e0081e90 807a7d9c 8079e194 00000064 00000001 00000000 e0081eac 1ea0: 85a2cc10 8342ccc0 00006400 0000000b e0081ea0 00000000 00000000 021e2cde 1ec0: 85bb5480 40946400 200000c0 200000c0 85bb5480 00000007 e0081ef4 e0081ee8 1ee0: 807a7ebc 021e2cde e0081f14 40946400 00000000 85bb5481 200000c0 85bb5480 1f00: 00000007 83ad6000 e0081fa4 e0081f18 80578f00 813c7334 ecac8b10 83ad6000 1f20: e0081f3c e0081f30 81a61760 81a61630 e0081f54 e0081f40 8025c484 8028d914 1f40: e0081fb0 40000000 e0081f84 e0081f58 802229ec 8025c440 00000000 8281cfb4 1f60: e0081fb0 0014ced0 ecac8b10 80222940 00000000 021e2cde e0081fac 00000000 1f80: 00000000 00316448 00000036 8020029c 83ad6000 00000036 00000000 e0081fa8 1fa0: 80200060 80578ddc 00000000 00000000 00000007 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f250bc 1fe0: 76f24ec0 76f24eb0 00019294 00132970 60000010 00000007 00000000 00000000 Call trace: [<813dbc08>] (subdev_8255_io) from [<813db940>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000005 r6:00000005 r5:840a7780 r4:813dbc08 [<813db8e8>] (subdev_8255_do_config) from [<813dbd00>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813db8e8>] (subdev_8255_do_config) from [<813dbd00>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85567084 [<813dbc74>] (subdev_8255_io_init) from [<813dbef4>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813dbc74>] (subdev_8255_io_init) from [<813dbef4>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00000005 r6:e0081da8 r5:840a7780 r4:85567084 [<813dbe38>] (dev_8255_attach) from [<813cadec>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:840a7780 r7:e0081d90 r6:840a77c4 r5:840a7780 r4:829d23cc [<813cace4>] (comedi_device_attach) from [<813c6938>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83ad6000 r7:200000c0 r6:b5403587 r5:840a7780 r4:200000c0 [<813c6838>] (do_devconfig_ioctl) from [<813c7904>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83ad6000 r7:200000c0 r6:200000c0 r5:840a7780 r4:85bb5480 [<813c7328>] (comedi_unlocked_ioctl) from [<80578f00>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c7328>] (comedi_unlocked_ioctl) from [<80578f00>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c7328>] (comedi_unlocked_ioctl) from [<80578f00>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c7328>] (comedi_unlocked_ioctl) from [<80578f00>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83ad6000 r9:00000007 r8:85bb5480 r7:200000c0 r6:85bb5481 r5:00000000 r4:40946400 [<80578dd0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0081fa8 to 0xe0081ff0) 1fa0: 00000000 00000000 00000007 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f250bc 1fe0: 76f24ec0 76f24eb0 00019294 00132970 r10:00000036 r9:83ad6000 r8:8020029c r7:00000036 r6:00316448 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