8<--- cut here --- Unable to handle kernel paging request at virtual address fee00005 when write [fee00005] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 11093 Comm: syz.9.1148 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 : [<814430d8>] lr : [<814430c4>] psr: 60000013 sp : dfdcdcb8 ip : dfdcdcb8 fp : dfdcdcd4 r10: 00000000 r9 : 00000084 r8 : dfdcdda4 r7 : 00000002 r6 : 0000009b r5 : 84644cc0 r4 : 00000005 r3 : 0000009b r2 : fee00005 r1 : 00000001 r0 : 84644cc0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86aba800 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84644cc0 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 84644cc0 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: 2-page vmalloc region starting at 0xdfdcc000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xdfdcc000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r12 information: 2-page vmalloc region starting at 0xdfdcc000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Process syz.9.1148 (pid: 11093, stack limit = 0xdfdcc000) Stack: (0xdfdcdcb8 to 0xdfdce000) dca0: 81443078 00000002 dcc0: 84644cc0 00000002 dfdcdcf4 dfdcdcd8 81442db4 81443084 00000002 80524064 dce0: 86aa9000 86aa9000 dfdcdd14 dfdcdcf8 8144316c 81442d68 84644cc0 00000000 dd00: 86aa9000 00000002 dfdcdd54 dfdcdd18 8144331c 814430f0 82b19734 87a96f80 dd20: 828217c0 00000000 00000000 829d72e0 84644cc0 00000000 dfdcdd90 84644cc0 dd40: 00000000 82b2f0bc dfdcdd8c dfdcdd58 81431c60 814432b4 40946400 00000000 dd60: dfdcdd7c 20000080 84644cc0 b5403587 40946400 00000002 00000003 83f68000 dd80: dfdcde4c dfdcdd90 8142d46c 81431b60 35353238 00000000 00000000 00000000 dda0: 00000000 00000002 00000001 00000a3e 0000000d 00000002 00000006 00010001 ddc0: fffffffd 0000003d 20000004 000000e8 000000de 00000803 00000005 fffffff8 dde0: 00000007 00000005 00000178 00000007 00000fff 00000003 00000003 20000000 de00: 00000000 00000002 00000400 00000e9e 00000006 0000000a 00000004 000000ff de20: 00000000 3e16bc9c 00000000 866dfcc0 84644cc0 20000080 40946400 00000002 de40: dfdcdf14 dfdcde50 8142e790 8142d3a4 00000000 3e16bc9c 00000000 00000000 de60: 824b957c dfdcdea4 0000005f 847c2448 00000064 84644cf0 dfdcdee4 dfdcde88 de80: 807d0af8 807c6ed0 00000064 00000001 00000000 dfdcdea4 830e29d0 834dd7f8 dea0: 00006400 0000000b dfdcde98 00000000 00000000 3e16bc9c 00000000 866dfcc0 dec0: 40946400 20000080 20000080 866dfcc0 00000003 83f68000 dfdcdef4 dfdcdee8 dee0: 807d0c28 3e16bc9c dfdcdf14 00000000 866dfcc1 40946400 20000080 866dfcc0 df00: 00000003 83f68000 dfdcdfa4 dfdcdf18 805912c0 8142e448 ecac8b10 83f68000 df20: dfdcdf3c dfdcdf30 81ae8594 81ae8460 dfdcdf54 dfdcdf40 8025a894 8028c408 df40: dfdcdfb0 40000000 dfdcdf84 dfdcdf58 80220bf8 8025a850 00000000 8281d27c df60: dfdcdfb0 0013e4a0 ecac8b10 80220b4c 00000000 3e16bc9c dfdcdfac 00000000 df80: 00000000 00346310 00000036 8020029c 83f68000 00000036 00000000 dfdcdfa8 dfa0: 80200060 80591088 00000000 00000000 00000003 40946400 20000080 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f2c0dc dfe0: 76f2be88 76f2be78 00018bc4 00130300 60000010 00000003 00000000 00000000 Call trace: [<81443078>] (subdev_8255_io) from [<81442db4>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000002 r6:84644cc0 r5:00000002 r4:81443078 [<81442d5c>] (subdev_8255_do_config) from [<8144316c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81442d5c>] (subdev_8255_do_config) from [<8144316c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86aa9000 [<814430e4>] (subdev_8255_io_init) from [<8144331c>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<814430e4>] (subdev_8255_io_init) from [<8144331c>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00000002 r6:86aa9000 r5:00000000 r4:84644cc0 [<814432a8>] (dev_8255_attach) from [<81431c60>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1077) r10:82b2f0bc r9:00000000 r8:84644cc0 r7:dfdcdd90 r6:00000000 r5:84644cc0 r4:829d72e0 [<81431b54>] (comedi_device_attach) from [<8142d46c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:83f68000 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:84644cc0 r4:20000080 [<8142d398>] (do_devconfig_ioctl) from [<8142e790>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:20000080 r5:84644cc0 r4:866dfcc0 [<8142e43c>] (comedi_unlocked_ioctl) from [<805912c0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142e43c>] (comedi_unlocked_ioctl) from [<805912c0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142e43c>] (comedi_unlocked_ioctl) from [<805912c0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142e43c>] (comedi_unlocked_ioctl) from [<805912c0>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83f68000 r9:00000003 r8:866dfcc0 r7:20000080 r6:40946400 r5:866dfcc1 r4:00000000 [<8059107c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfdcdfa8 to 0xdfdcdff0) dfa0: 00000000 00000000 00000003 40946400 20000080 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f2c0dc dfe0: 76f2be88 76f2be78 00018bc4 00130300 r10:00000036 r9:83f68000 r8:8020029c r7:00000036 r6:00346310 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