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: 5286 Comm: syz.3.268 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 : [<813ddba0>] lr : [<813ddb8c>] psr: 60000013 sp : dfa59cb8 ip : dfa59cb8 fp : dfa59cd4 r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00000005 r6 : 0000009b r5 : 842a9000 r4 : 00000008 r3 : 0000009b r2 : fee00008 r1 : 00000001 r0 : 842a9000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85417980 DAC: 00000000 Register r0 information: slab kmalloc-192 start 842a9000 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 842a9000 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 0xdfa58000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2610 Register r12 information: 2-page vmalloc region starting at 0xdfa58000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2610 Process syz.3.268 (pid: 5286, stack limit = 0xdfa58000) Stack: (0xdfa59cb8 to 0xdfa5a000) 9ca0: 813ddb40 842a9000 9cc0: 00000005 00000005 dfa59cf4 dfa59cd8 813dd878 813ddb4c 00000005 8050b9dc 9ce0: 84f5d084 84f5d084 dfa59d14 dfa59cf8 813ddc38 813dd82c 84f5d084 842a9000 9d00: dfa59da8 00000005 dfa59d54 dfa59d18 813dde2c 813ddbb8 82af1fa0 8471b300 9d20: 828216f0 00000000 00000000 829d24cc 842a9000 842a9044 dfa59d90 842a9000 9d40: 00000000 82b258b0 dfa59d8c dfa59d58 813ccd78 813ddd7c 200000c0 00000000 9d60: dfa59d7c 200000c0 842a9000 b5403587 200000c0 8425d400 40946400 00000003 9d80: dfa59e4c dfa59d90 813c88d0 813ccc7c 35353238 00000000 00000000 00000000 9da0: 00000000 40404f26 00000005 00000002 0000d5db 0000000c 00000009 00000fff 9dc0: 5c95238c 0000000a 000003bf 00000802 00001600 00000005 20000001 00000809 9de0: 0400e1c8 00000006 00000007 00000006 00000199 00000006 00000004 0000000b 9e00: 00000402 00000010 00000003 000000ef 00000000 0000000a 08000003 dffffffd 9e20: 00000000 1c93c7ce 00000000 855f60c0 842a9000 200000c0 200000c0 8425d400 9e40: dfa59f14 dfa59e50 813c989c 813c87dc 00000000 00000000 00000000 1c93c7ce 9e60: 00000000 00000000 8249a5b4 0000005f 841417f8 842a9030 841d9294 8425d400 9e80: dfa59ee4 dfa59e90 807ab168 807a18c4 00000064 00000001 00000000 dfa59eac 9ea0: 85e6e310 834f2a18 00006400 0000000b dfa59ea0 00000000 00000000 1c93c7ce 9ec0: 855f60c0 40946400 200000c0 200000c0 855f60c0 00000004 dfa59ef4 dfa59ee8 9ee0: 807ab288 1c93c7ce dfa59f14 40946400 00000000 855f60c1 200000c0 855f60c0 9f00: 00000004 8425d400 dfa59fa4 dfa59f18 8057b7e4 813c92cc ecac8b10 8425d400 9f20: dfa59f3c dfa59f30 81a636e0 81a635b0 dfa59f54 dfa59f40 8025c464 8028ea74 9f40: dfa59fb0 40000000 dfa59f84 dfa59f58 802229ec 8025c420 00000000 8281d0bc 9f60: dfa59fb0 0014cf70 ecac8b10 80222940 00000000 1c93c7ce dfa59fac 00000000 9f80: 00000000 00316308 00000036 8020029c 8425d400 00000036 00000000 dfa59fa8 9fa0: 80200060 8057b6c0 00000000 00000000 00000004 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fed0bc 9fe0: 76fecec0 76feceb0 00019294 00132a10 60000010 00000004 00000000 00000000 Call trace: [<813ddb40>] (subdev_8255_io) from [<813dd878>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000005 r6:00000005 r5:842a9000 r4:813ddb40 [<813dd820>] (subdev_8255_do_config) from [<813ddc38>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813dd820>] (subdev_8255_do_config) from [<813ddc38>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:84f5d084 [<813ddbac>] (subdev_8255_io_init) from [<813dde2c>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813ddbac>] (subdev_8255_io_init) from [<813dde2c>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00000005 r6:dfa59da8 r5:842a9000 r4:84f5d084 [<813ddd70>] (dev_8255_attach) from [<813ccd78>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b258b0 r9:00000000 r8:842a9000 r7:dfa59d90 r6:842a9044 r5:842a9000 r4:829d24cc [<813ccc70>] (comedi_device_attach) from [<813c88d0>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:8425d400 r7:200000c0 r6:b5403587 r5:842a9000 r4:200000c0 [<813c87d0>] (do_devconfig_ioctl) from [<813c989c>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:8425d400 r7:200000c0 r6:200000c0 r5:842a9000 r4:855f60c0 [<813c92c0>] (comedi_unlocked_ioctl) from [<8057b7e4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c92c0>] (comedi_unlocked_ioctl) from [<8057b7e4>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c92c0>] (comedi_unlocked_ioctl) from [<8057b7e4>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c92c0>] (comedi_unlocked_ioctl) from [<8057b7e4>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:8425d400 r9:00000004 r8:855f60c0 r7:200000c0 r6:855f60c1 r5:00000000 r4:40946400 [<8057b6b4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa59fa8 to 0xdfa59ff0) 9fa0: 00000000 00000000 00000004 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fed0bc 9fe0: 76fecec0 76feceb0 00019294 00132a10 r10:00000036 r9:8425d400 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