8<--- cut here --- Unable to handle kernel paging request at virtual address fee00103 when write [fee00103] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6822 Comm: syz.2.768 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 : [<814684c8>] lr : [<814684b4>] psr: 60000013 sp : e03c5cb8 ip : e03c5cb8 fp : e03c5cd4 r10: 00000100 r9 : 00000004 r8 : e03c5da4 r7 : 00000000 r6 : 0000009b r5 : 8464acc0 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 8464acc0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 861412c0 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8464acc0 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:1048 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 8464acc0 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: 2-page vmalloc region starting at 0xe03c4000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xe03c4000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r12 information: 2-page vmalloc region starting at 0xe03c4000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Process syz.2.768 (pid: 6822, stack limit = 0xe03c4000) Stack: (0xe03c5cb8 to 0xe03c6000) 5ca0: 81468468 00000100 5cc0: 8464acc0 00000000 e03c5cf4 e03c5cd8 814681a4 81468474 00000100 80532a2c 5ce0: 83197000 83197000 e03c5d14 e03c5cf8 8146855c 81468158 8464acc0 00000000 5d00: 83197000 00000000 e03c5d54 e03c5d18 8146870c 814684e0 ffffffff 00000004 5d20: 82a20900 00000000 00000000 82bd2a24 8464acc0 00000000 e03c5d90 8464acc0 5d40: 00000000 82d29754 e03c5d8c e03c5d58 814570b0 814686a4 40946400 00000000 5d60: e03c5d7c 20000180 8464acc0 b5403587 40946400 00000003 00000003 84fc3200 5d80: e03c5e4c e03c5d90 814528bc 81456fb4 35353238 00000000 00000000 00000000 5da0: 00000000 00000100 0000000a 00000001 00000ffc 0000000e 10000073 00000079 5dc0: 80000003 133d071d fffffffe ffffffff 00000001 00000008 fffffffd 00000100 5de0: 000000fa 00000001 00000189 00000003 0000000a 00020089 0000ca9c fffffffe 5e00: 20001e58 00000007 00000000 00000001 00000008 0000a6b4 fffffffe 00000008 5e20: 00000000 5377e93d 00000000 85973b00 8464acc0 20000180 40946400 00000003 5e40: e03c5f14 e03c5e50 81453be0 814527f4 00000000 5377e93d 00000000 00000000 5e60: 82531804 e03c5ea4 0000005f 848b4408 00000064 8464acf0 e03c5ee4 e03c5e88 5e80: 807ea79c 807e0ab0 00000064 00000001 00000000 e03c5ea4 8383d190 834f2cc0 5ea0: 00006400 0000000b e03c5e98 00000000 00000000 5377e93d 00000000 85973b00 5ec0: 40946400 20000180 20000180 85973b00 00000003 84fc3200 e03c5ef4 e03c5ee8 5ee0: 807ea8d0 5377e93d e03c5f14 00000000 85973b01 40946400 20000180 85973b00 5f00: 00000003 84fc3200 e03c5fa4 e03c5f18 805a20fc 81453898 ecac8b10 84fc3200 5f20: e03c5f3c e03c5f30 81b1ad14 81b1abe0 e03c5f54 e03c5f40 8025a6ac 8028e294 5f40: e03c5fb0 40000000 e03c5f84 e03c5f58 80220be0 8025a668 00000000 82a1c63c 5f60: e03c5fb0 0013e9b0 ecac8b10 80220b34 00000000 5377e93d e03c5fac 00000000 5f80: 00000000 00346310 00000036 8020029c 84fc3200 00000036 00000000 e03c5fa8 5fa0: 80200060 805a1ec4 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f210dc 5fe0: 76f20e88 76f20e78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<81468468>] (subdev_8255_io) from [<814681a4>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8464acc0 r5:00000100 r4:81468468 [<8146814c>] (subdev_8255_do_config) from [<8146855c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8146814c>] (subdev_8255_do_config) from [<8146855c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:83197000 [<814684d4>] (subdev_8255_io_init) from [<8146870c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814684d4>] (subdev_8255_io_init) from [<8146870c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:83197000 r5:00000000 r4:8464acc0 [<81468698>] (dev_8255_attach) from [<814570b0>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d29754 r9:00000000 r8:8464acc0 r7:e03c5d90 r6:00000000 r5:8464acc0 r4:82bd2a24 [<81456fa8>] (comedi_device_attach) from [<814528bc>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:84fc3200 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8464acc0 r4:20000180 [<814527e8>] (do_devconfig_ioctl) from [<81453be0>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:8464acc0 r4:85973b00 [<8145388c>] (comedi_unlocked_ioctl) from [<805a20fc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8145388c>] (comedi_unlocked_ioctl) from [<805a20fc>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8145388c>] (comedi_unlocked_ioctl) from [<805a20fc>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8145388c>] (comedi_unlocked_ioctl) from [<805a20fc>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84fc3200 r9:00000003 r8:85973b00 r7:20000180 r6:40946400 r5:85973b01 r4:00000000 [<805a1eb8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe03c5fa8 to 0xe03c5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f210dc 5fe0: 76f20e88 76f20e78 00018ebc 00130810 r10:00000036 r9:84fc3200 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