comedi comedi3: 8255: I/O port conflict (0x404f26,4) 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: 10668 Comm: syz.2.10887 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 : [<813dbc18>] lr : [<813dbc04>] psr: 60000013 sp : eaa41cb8 ip : eaa41cb8 fp : eaa41cd4 r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00000005 r6 : 0000009b r5 : 84102000 r4 : 00000008 r3 : 0000009b r2 : fee00008 r1 : 00000001 r0 : 84102000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85a1b100 DAC: 00000000 Register r0 information: slab kmalloc-192 start 84102000 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 84102000 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 0xeaa40000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xeaa40000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.2.10887 (pid: 10668, stack limit = 0xeaa40000) Stack: (0xeaa41cb8 to 0xeaa42000) 1ca0: 813dbbb8 84102000 1cc0: 00000005 00000005 eaa41cf4 eaa41cd8 813db8f0 813dbbc4 00000005 8050a7fc 1ce0: 85cc7084 85cc7084 eaa41d14 eaa41cf8 813dbcb0 813db8a4 85cc7084 84102000 1d00: eaa41da8 00000005 eaa41d54 eaa41d18 813dbea4 813dbc30 8079dfdc 84d5ee00 1d20: 828215f0 00000000 00000000 829d23cc 84102000 84102044 eaa41d90 84102000 1d40: 00000000 82b25910 eaa41d8c eaa41d58 813cad9c 813dbdf4 200000c0 00000000 1d60: eaa41d7c 200000c0 84102000 b5403587 200000c0 85488c00 40946400 00000003 1d80: eaa41e4c eaa41d90 813c68e8 813caca0 35353238 00000000 00000000 00000000 1da0: 00000000 00404f26 00000005 00000002 00000401 0000000c 00000cc7 00000fff 1dc0: 5c95239c 00000005 000003bf 00000802 00001600 00000001 20000001 00000009 1de0: 0000e1cb 00000006 00000004 000003fe 00000195 00000006 00000000 0000000b 1e00: 00000402 00000009 00000003 00000040 00000005 00000004 08000003 dffffffa 1e20: 00000000 1894c0a4 00000000 84f6c180 84102000 200000c0 200000c0 85488c00 1e40: eaa41f14 eaa41e50 813c78b4 813c67f4 00000000 eaa41e54 eaa41e54 1894c0a4 1e60: 00000000 00000000 824625b4 0000005f 83df9018 84102030 841cacfc 85488c00 1e80: eaa41ee4 eaa41e90 807a7d9c 8079e194 00000064 00000001 00000000 eaa41eac 1ea0: 868e2c10 834e9440 00006400 0000000b eaa41ea0 00000000 eaa41d30 1894c0a4 1ec0: 84f6c180 40946400 200000c0 200000c0 84f6c180 00000003 eaa41ef4 eaa41ee8 1ee0: 807a7ebc 1894c0a4 eaa41f14 40946400 00000000 84f6c181 200000c0 84f6c180 1f00: 00000003 85488c00 eaa41fa4 eaa41f18 80578f00 813c72e4 ecac8b10 85488c00 1f20: eaa41f3c eaa41f30 81a61720 81a615f0 eaa41f54 eaa41f40 8025c484 8028d914 1f40: eaa41fb0 40000000 eaa41f84 eaa41f58 802229ec 8025c440 00000000 8281cfb4 1f60: eaa41fb0 0014ced0 ecac8b10 80222940 00000000 1894c0a4 eaa41fac 00000000 1f80: 00000000 00316308 00000036 8020029c 85488c00 00000036 00000000 eaa41fa8 1fa0: 80200060 80578ddc 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f000bc 1fe0: 76effec0 76effeb0 00019294 00132970 60000010 00000003 00000000 00000000 Call trace: [<813dbbb8>] (subdev_8255_io) from [<813db8f0>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000005 r6:00000005 r5:84102000 r4:813dbbb8 [<813db898>] (subdev_8255_do_config) from [<813dbcb0>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813db898>] (subdev_8255_do_config) from [<813dbcb0>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85cc7084 [<813dbc24>] (subdev_8255_io_init) from [<813dbea4>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813dbc24>] (subdev_8255_io_init) from [<813dbea4>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00000005 r6:eaa41da8 r5:84102000 r4:85cc7084 [<813dbde8>] (dev_8255_attach) from [<813cad9c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:84102000 r7:eaa41d90 r6:84102044 r5:84102000 r4:829d23cc [<813cac94>] (comedi_device_attach) from [<813c68e8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85488c00 r7:200000c0 r6:b5403587 r5:84102000 r4:200000c0 [<813c67e8>] (do_devconfig_ioctl) from [<813c78b4>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:85488c00 r7:200000c0 r6:200000c0 r5:84102000 r4:84f6c180 [<813c72d8>] (comedi_unlocked_ioctl) from [<80578f00>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c72d8>] (comedi_unlocked_ioctl) from [<80578f00>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c72d8>] (comedi_unlocked_ioctl) from [<80578f00>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c72d8>] (comedi_unlocked_ioctl) from [<80578f00>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85488c00 r9:00000003 r8:84f6c180 r7:200000c0 r6:84f6c181 r5:00000000 r4:40946400 [<80578dd0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xeaa41fa8 to 0xeaa41ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f000bc 1fe0: 76effec0 76effeb0 00019294 00132970 r10:00000036 r9:85488c00 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