8<--- cut here --- Unable to handle kernel paging request at virtual address fee05c25 when write [fee05c25] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4149 Comm: syz.0.109 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 parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<813ce690>] lr : [<813ce680>] psr: 60000013 sp : dfa9dd30 ip : dfa9dd30 fp : dfa9dd54 r10: 82b25910 r9 : 00000003 r8 : 8429a0c0 r7 : dfa9dd90 r6 : 8429a0c0 r5 : 00000000 r4 : 00000000 r3 : fee05c25 r2 : 81e177dc r1 : 00000001 r0 : 813ce300 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85903300 DAC: 00000000 Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 8429a0c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa9c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 8429a0c0 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdfa9c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfa9c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.0.109 (pid: 4149, stack limit = 0xdfa9c000) Stack: (0xdfa9dd30 to 0xdfa9e000) dd20: 823f13b8 8429a0c0 829d1bf4 829d1bf4 dd40: 81e17c9c 8429a104 dfa9dd8c dfa9dd58 813ca720 813ce528 200000c0 00000000 dd60: dfa9dd7c 200000c0 8429a0c0 b5403587 200000c0 85105400 40946400 00000003 dd80: dfa9de4c dfa9dd90 813c626c 813ca624 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00005c25 00000003 00000001 00000000 00000002 00000cc7 0000000c ddc0: 00000007 0000000a 000000fe 00000002 00000001 00000006 00000403 00000006 dde0: 00000009 00000001 0001a449 00000003 40000003 00000089 00007fff 00000b27 de00: 00000005 0000800b 00000008 00000005 00000008 00000008 00010000 fffffff7 de20: 00000000 a88516ca 00000000 84998f00 8429a0c0 200000c0 200000c0 85105400 de40: dfa9df14 dfa9de50 813c7238 813c6178 00000000 00000000 00000000 a88516ca de60: 00000000 00000000 824625b4 0000005f 840a6a30 8429a0f0 842970e4 85105400 de80: dfa9dee4 dfa9de90 807a7684 8079da7c 00000064 00000001 00000000 dfa9deac dea0: 858a83d0 834e2000 00006400 0000000b dfa9dea0 00000000 00000000 a88516ca dec0: 84998f00 40946400 200000c0 200000c0 84998f00 00000003 dfa9def4 dfa9dee8 dee0: 807a77a4 a88516ca dfa9df14 40946400 00000000 84998f01 200000c0 84998f00 df00: 00000003 85105400 dfa9dfa4 dfa9df18 805788b8 813c6c68 ecac8b10 85105400 df20: dfa9df3c dfa9df30 81a60ab8 81a60988 dfa9df54 dfa9df40 8025c484 8028d914 df40: dfa9dfb0 40000000 dfa9df84 dfa9df58 802229ec 8025c440 00000000 8281cfb4 df60: dfa9dfb0 0014ca70 ecac8b10 80222940 00000000 a88516ca dfa9dfac 00000000 df80: 00000000 00316308 00000036 8020029c 85105400 00000036 00000000 dfa9dfa8 dfa0: 80200060 80578794 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f810bc dfe0: 76f80ec0 76f80eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813ce51c>] (parport_attach) from [<813ca720>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:8429a104 r5:81e17c9c r4:829d1bf4 [<813ca618>] (comedi_device_attach) from [<813c626c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85105400 r7:200000c0 r6:b5403587 r5:8429a0c0 r4:200000c0 [<813c616c>] (do_devconfig_ioctl) from [<813c7238>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:85105400 r7:200000c0 r6:200000c0 r5:8429a0c0 r4:84998f00 [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85105400 r9:00000003 r8:84998f00 r7:200000c0 r6:84998f01 r5:00000000 r4:40946400 [<80578788>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa9dfa8 to 0xdfa9dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f810bc dfe0: 76f80ec0 76f80eb0 000195a4 00132510 r10:00000036 r9:85105400 r8:8020029c r7:00000036 r6:00316308 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction