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: 4766 Comm: syz.1.216 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 : [<813b8ba8>] lr : [<813b8b94>] psr: 60000013 sp : dfa11cb8 ip : dfa11cb8 fp : dfa11cd4 r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00000005 r6 : 0000009b r5 : 841a0180 r4 : 00000008 r3 : 0000009b r2 : fee00008 r1 : 00000001 r0 : 841a0180 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85aa4240 DAC: 00000000 Register r0 information: slab kmalloc-192 start 841a0180 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 841a0180 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:2605 Register r12 information: 2-page vmalloc region starting at 0xdfa10000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.1.216 (pid: 4766, stack limit = 0xdfa10000) Stack: (0xdfa11cb8 to 0xdfa12000) 1ca0: 813b8b48 841a0180 1cc0: 00000005 00000005 dfa11cf4 dfa11cd8 813b8880 813b8b54 00000005 80503b64 1ce0: 84dce884 84dce884 dfa11d14 dfa11cf8 813b8c40 813b8834 84dce884 841a0180 1d00: dfa11da8 00000005 dfa11d54 dfa11d18 813b8e34 813b8bc0 82ae3da0 848dc780 1d20: 828215b0 00000000 00000000 829d0144 841a0180 841a01c4 dfa11d90 841a0180 1d40: 00000000 82b16f40 dfa11d8c dfa11d58 813a7d3c 813b8d84 200000c0 00000000 1d60: dfa11d7c 200000c0 841a0180 b5403587 200000c0 84bf6000 40946400 00000003 1d80: dfa11e4c dfa11d90 813a3888 813a7c40 35353238 00000000 00000000 00000000 1da0: 00000000 40404f26 00000005 00000002 00000401 0000000c 00000009 00000fff 1dc0: 5c95239c 00000005 000003bf 00000802 00001600 00000001 20000001 00000009 1de0: 00000000 00000006 00000000 00000400 00000195 00000006 00000000 0000000b 1e00: 00000402 00000009 00000003 00000041 00000005 00000006 08000003 dffffffa 1e20: 00000000 ccb86071 00000000 84d94d80 841a0180 200000c0 200000c0 84bf6000 1e40: dfa11f14 dfa11e50 813a4854 813a3794 00000000 00000000 00000000 ccb86071 1e60: 00000000 00000000 8247054c 0000005f 8427c658 841a01b0 84167d8c 84bf6000 1e80: dfa11ee4 dfa11e90 80797aa4 8078de08 00000064 00000001 00000000 dfa11eac 1ea0: 858ae790 8343dc38 00006400 0000000b dfa11ea0 00000000 00000000 ccb86071 1ec0: 84d94d80 40946400 200000c0 200000c0 84d94d80 00000003 dfa11ef4 dfa11ee8 1ee0: 80797bc4 ccb86071 dfa11f14 40946400 00000000 84d94d81 200000c0 84d94d80 1f00: 00000003 84bf6000 dfa11fa4 dfa11f18 8056cdc8 813a4284 ecac8b10 84bf6000 1f20: dfa11f3c dfa11f30 81a39db8 81a39c88 dfa11f54 dfa11f40 8025e490 8028ef6c 1f40: dfa11fb0 40000000 dfa11f84 dfa11f58 802229ec 8025e44c 00000000 8281cddc 1f60: dfa11fb0 0014c820 ecac8b10 80222940 00000000 ccb86071 dfa11fac 00000000 1f80: 00000000 002f6308 00000036 8020029c 84bf6000 00000036 00000000 dfa11fa8 1fa0: 80200060 8056cca4 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f580bc 1fe0: 76f57ec0 76f57eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813b8b48>] (subdev_8255_io) from [<813b8880>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000005 r6:00000005 r5:841a0180 r4:813b8b48 [<813b8828>] (subdev_8255_do_config) from [<813b8c40>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813b8828>] (subdev_8255_do_config) from [<813b8c40>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:84dce884 [<813b8bb4>] (subdev_8255_io_init) from [<813b8e34>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813b8bb4>] (subdev_8255_io_init) from [<813b8e34>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00000005 r6:dfa11da8 r5:841a0180 r4:84dce884 [<813b8d78>] (dev_8255_attach) from [<813a7d3c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b16f40 r9:00000000 r8:841a0180 r7:dfa11d90 r6:841a01c4 r5:841a0180 r4:829d0144 [<813a7c34>] (comedi_device_attach) from [<813a3888>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:84bf6000 r7:200000c0 r6:b5403587 r5:841a0180 r4:200000c0 [<813a3788>] (do_devconfig_ioctl) from [<813a4854>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:84bf6000 r7:200000c0 r6:200000c0 r5:841a0180 r4:84d94d80 [<813a4278>] (comedi_unlocked_ioctl) from [<8056cdc8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a4278>] (comedi_unlocked_ioctl) from [<8056cdc8>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a4278>] (comedi_unlocked_ioctl) from [<8056cdc8>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a4278>] (comedi_unlocked_ioctl) from [<8056cdc8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:84bf6000 r9:00000003 r8:84d94d80 r7:200000c0 r6:84d94d81 r5:00000000 r4:40946400 [<8056cc98>] (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 002f6308 00000036 002e0000 00000000 00006364 76f580bc 1fe0: 76f57ec0 76f57eb0 0001948c 001322c0 r10:00000036 r9:84bf6000 r8:8020029c r7:00000036 r6:002f6308 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