comedi comedi3: 8255: I/O port conflict (0x40404f24,4) 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: 11070 Comm: syz.0.10012 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 : [<813db2d8>] lr : [<813db2c4>] psr: 60000013 sp : dfa11cb8 ip : dfa11cb8 fp : dfa11cd4 r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00000005 r6 : 0000009b r5 : 8404a9c0 r4 : 00000008 r3 : 0000009b r2 : fee00008 r1 : 00000001 r0 : 8404a9c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85809d40 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8404a9c0 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 8404a9c0 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 0xdfa10000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfa10000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.0.10012 (pid: 11070, stack limit = 0xdfa10000) Stack: (0xdfa11cb8 to 0xdfa12000) 1ca0: 813db278 8404a9c0 1cc0: 00000005 00000005 dfa11cf4 dfa11cd8 813dafb0 813db284 00000005 8050a4a4 1ce0: 85443084 85443084 dfa11d14 dfa11cf8 813db370 813daf64 85443084 8404a9c0 1d00: dfa11da8 00000005 dfa11d54 dfa11d18 813db564 813db2f0 829d238c 8404a9c0 1d20: 00000000 00000000 8404a9c0 829d238c 8404a9c0 8404aa04 dfa11d90 8404a9c0 1d40: 00000000 82b25910 dfa11d8c dfa11d58 813ca460 813db4b4 200000c0 00000000 1d60: dfa11d7c 200000c0 8404a9c0 b5403587 200000c0 841da400 40946400 00000003 1d80: dfa11e4c dfa11d90 813c5fac 813ca364 35353238 00000000 00000000 00000000 1da0: 00000000 40404f24 00000005 00000002 000f0000 00000004 00000009 00000fff 1dc0: 00000004 00000009 400003bf 00000805 00001600 00000005 20000001 00000809 1de0: 0400e1c8 00000006 00000003 00000402 00000199 00000006 20000004 0000000b 1e00: 00000001 02000000 ffffffff 000000ef 00000101 0000000a 08000003 dffffffd 1e20: 00000000 06c7c460 00000000 8fa1eb40 8404a9c0 200000c0 200000c0 841da400 1e40: dfa11f14 dfa11e50 813c6f78 813c5eb8 00000000 00000000 00000000 06c7c460 1e60: 00000000 00000000 824625b4 0000005f 83a639f0 8404a9f0 8404c36c 841da400 1e80: dfa11ee4 dfa11e90 807a76f4 8079daec 00000064 00000001 00000000 dfa11eac 1ea0: 8fbe4790 834d8e58 00006400 0000000b dfa11ea0 00000000 00000000 06c7c460 1ec0: 8fa1eb40 40946400 200000c0 200000c0 8fa1eb40 00000003 dfa11ef4 dfa11ee8 1ee0: 807a7814 06c7c460 dfa11f14 40946400 00000000 8fa1eb41 200000c0 8fa1eb40 1f00: 00000003 841da400 dfa11fa4 dfa11f18 80578928 813c69a8 ecac8b10 841da400 1f20: dfa11f3c dfa11f30 81a607f8 81a606c8 dfa11f54 dfa11f40 8025c484 8028d914 1f40: dfa11fb0 40000000 dfa11f84 dfa11f58 802229ec 8025c440 00000000 8281cfb4 1f60: dfa11fb0 0014ced0 ecac8b10 80222940 00000000 06c7c460 dfa11fac 00000000 1f80: 00000000 00316308 00000036 8020029c 841da400 00000036 00000000 dfa11fa8 1fa0: 80200060 80578804 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f550bc 1fe0: 76f54ec0 76f54eb0 0001928c 00132970 60000010 00000003 00000000 00000000 Call trace: [<813db278>] (subdev_8255_io) from [<813dafb0>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000005 r6:00000005 r5:8404a9c0 r4:813db278 [<813daf58>] (subdev_8255_do_config) from [<813db370>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813daf58>] (subdev_8255_do_config) from [<813db370>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85443084 [<813db2e4>] (subdev_8255_io_init) from [<813db564>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813db2e4>] (subdev_8255_io_init) from [<813db564>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00000005 r6:dfa11da8 r5:8404a9c0 r4:85443084 [<813db4a8>] (dev_8255_attach) from [<813ca460>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:8404a9c0 r7:dfa11d90 r6:8404aa04 r5:8404a9c0 r4:829d238c [<813ca358>] (comedi_device_attach) from [<813c5fac>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:841da400 r7:200000c0 r6:b5403587 r5:8404a9c0 r4:200000c0 [<813c5eac>] (do_devconfig_ioctl) from [<813c6f78>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:841da400 r7:200000c0 r6:200000c0 r5:8404a9c0 r4:8fa1eb40 [<813c699c>] (comedi_unlocked_ioctl) from [<80578928>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c699c>] (comedi_unlocked_ioctl) from [<80578928>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c699c>] (comedi_unlocked_ioctl) from [<80578928>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c699c>] (comedi_unlocked_ioctl) from [<80578928>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:841da400 r9:00000003 r8:8fa1eb40 r7:200000c0 r6:8fa1eb41 r5:00000000 r4:40946400 [<805787f8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa11fa8 to 0xdfa11ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f550bc 1fe0: 76f54ec0 76f54eb0 0001928c 00132970 r10:00000036 r9:841da400 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