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: 5620 Comm: syz.1.399 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 : [<813dbda0>] lr : [<813dbd8c>] psr: 60000013 sp : dfa31cb8 ip : dfa31cb8 fp : dfa31cd4 r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00000005 r6 : 0000009b r5 : 83ff4b40 r4 : 00000008 r3 : 0000009b r2 : fee00008 r1 : 00000001 r0 : 83ff4b40 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85882600 DAC: fffffffd Register r0 information: slab kmalloc-192 start 83ff4b40 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 83ff4b40 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 0xdfa30000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfa30000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.1.399 (pid: 5620, stack limit = 0xdfa30000) Stack: (0xdfa31cb8 to 0xdfa32000) 1ca0: 813dbd40 83ff4b40 1cc0: 00000005 00000005 dfa31cf4 dfa31cd8 813dba78 813dbd4c 00000005 8050a7ec 1ce0: 85e29084 85e29084 dfa31d14 dfa31cf8 813dbe38 813dba2c 85e29084 83ff4b40 1d00: dfa31da8 00000005 dfa31d54 dfa31d18 813dc02c 813dbdb8 82af1fe0 85bdb280 1d20: 828215f0 00000000 00000000 829d23cc 83ff4b40 83ff4b84 dfa31d90 83ff4b40 1d40: 00000000 82b25910 dfa31d8c dfa31d58 813caf24 813dbf7c 200000c0 00000000 1d60: dfa31d7c 200000c0 83ff4b40 b5403587 200000c0 8566bc00 40946400 00000003 1d80: dfa31e4c dfa31d90 813c6a70 813cae28 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 93e3e3b6 00000000 85ab0540 83ff4b40 200000c0 200000c0 8566bc00 1e40: dfa31f14 dfa31e50 813c7a3c 813c697c 00000000 00000000 00000000 93e3e3b6 1e60: 00000000 00000000 824625b4 0000005f 83c2c250 83ff4b70 83ff1294 8566bc00 1e80: dfa31ee4 dfa31e90 807a7a38 8079e184 00000064 00000001 00000000 dfa31eac 1ea0: 85927550 834ebbb0 00006400 0000000b dfa31ea0 00000000 00000000 93e3e3b6 1ec0: 85ab0540 40946400 200000c0 200000c0 85ab0540 00000005 dfa31ef4 dfa31ee8 1ee0: 807a7b58 93e3e3b6 dfa31f14 40946400 00000000 85ab0541 200000c0 85ab0540 1f00: 00000005 8566bc00 dfa31fa4 dfa31f18 80578ef0 813c746c ecac8b10 8566bc00 1f20: dfa31f3c dfa31f30 81a618a0 81a61770 dfa31f54 dfa31f40 8025c484 8028d914 1f40: dfa31fb0 40000000 dfa31f84 dfa31f58 802229ec 8025c440 00000000 8281cfb4 1f60: dfa31fb0 0014ced0 ecac8b10 80222940 00000000 93e3e3b6 dfa31fac 00000000 1f80: 00000000 00316448 00000036 8020029c 8566bc00 00000036 00000000 dfa31fa8 1fa0: 80200060 80578dcc 00000000 00000000 00000005 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f360bc 1fe0: 76f35ec0 76f35eb0 00019294 00132970 60000010 00000005 00000000 00000000 Call trace: [<813dbd40>] (subdev_8255_io) from [<813dba78>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000005 r6:00000005 r5:83ff4b40 r4:813dbd40 [<813dba20>] (subdev_8255_do_config) from [<813dbe38>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813dba20>] (subdev_8255_do_config) from [<813dbe38>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85e29084 [<813dbdac>] (subdev_8255_io_init) from [<813dc02c>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813dbdac>] (subdev_8255_io_init) from [<813dc02c>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00000005 r6:dfa31da8 r5:83ff4b40 r4:85e29084 [<813dbf70>] (dev_8255_attach) from [<813caf24>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:83ff4b40 r7:dfa31d90 r6:83ff4b84 r5:83ff4b40 r4:829d23cc [<813cae1c>] (comedi_device_attach) from [<813c6a70>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:8566bc00 r7:200000c0 r6:b5403587 r5:83ff4b40 r4:200000c0 [<813c6970>] (do_devconfig_ioctl) from [<813c7a3c>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:8566bc00 r7:200000c0 r6:200000c0 r5:83ff4b40 r4:85ab0540 [<813c7460>] (comedi_unlocked_ioctl) from [<80578ef0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c7460>] (comedi_unlocked_ioctl) from [<80578ef0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c7460>] (comedi_unlocked_ioctl) from [<80578ef0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c7460>] (comedi_unlocked_ioctl) from [<80578ef0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:8566bc00 r9:00000005 r8:85ab0540 r7:200000c0 r6:85ab0541 r5:00000000 r4:40946400 [<80578dc0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa31fa8 to 0xdfa31ff0) 1fa0: 00000000 00000000 00000005 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f360bc 1fe0: 76f35ec0 76f35eb0 00019294 00132970 r10:00000036 r9:8566bc00 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