8<--- cut here --- Unable to handle kernel paging request at virtual address fee083fb when write [fee083fb] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 7739 Comm: syz.1.733 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 : [<814012a4>] lr : [<81401294>] psr: 60000013 sp : e434dd30 ip : e434dd30 fp : e434dd54 r10: 82b28b30 r9 : 00000003 r8 : 8451e6c0 r7 : e434dd90 r6 : 8451e6c0 r5 : 00000000 r4 : 00000000 r3 : fee083fb r2 : 81e24f44 r1 : 00000001 r0 : 81400f14 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85ebb540 DAC: fffffffd 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 8451e6c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe434c000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 8451e6c0 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 0xe434c000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xe434c000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Process syz.1.733 (pid: 7739, stack limit = 0xe434c000) Stack: (0xe434dd30 to 0xe434e000) dd20: 8243d12c 8451e6c0 829d3948 829d3948 dd40: 81e25404 00000000 e434dd8c e434dd58 813fced0 8140113c 40946400 00000000 dd60: e434dd7c 200000c0 8451e6c0 b5403587 40946400 84b86c00 00000003 8451e6f0 dd80: e434de4c e434dd90 813f8800 813fcdd0 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 000083fb 00000002 00010000 00020004 00000005 00000cc7 00000008 ddc0: 0000008d 0000000a 00000000 00000002 00000800 00000001 ffffffff 0000000a dde0: 00000081 00000002 0001a449 00000003 40000003 00000089 0000caa7 00003f0a de00: 20001e5c 0000f9c7 ffc00004 0000003b 00000008 00000006 f7fffff7 fffffff8 de20: 00000000 2b0e41d0 00000000 84d3bf00 8451e6c0 200000c0 40946400 84b86c00 de40: e434df14 e434de50 813f9380 813f8738 00000000 2b0e41d0 00000000 00000000 de60: 824b15ec e434dea4 0000005f 83ee3be8 00000064 8453d684 e434dee4 e434de88 de80: 807b404c 807aa6c8 00000064 00000001 00000000 e434dea4 85cac0d0 83426e58 dea0: 00006400 0000000b e434de98 00000000 00000000 2b0e41d0 00000000 84d3bf00 dec0: 40946400 200000c0 200000c0 84d3bf00 00000003 84b86c00 e434def4 e434dee8 dee0: 807b417c 2b0e41d0 e434df14 00000000 84d3bf01 40946400 200000c0 84d3bf00 df00: 00000003 84b86c00 e434dfa4 e434df18 8058223c 813f9288 ecac8b10 84b86c00 df20: e434df3c e434df30 81aa6d78 81aa6c48 e434df54 e434df40 8025ba7c 8028ef68 df40: e434dfb0 40000000 e434df84 e434df58 80221a54 8025ba38 00000000 8281cf7c df60: e434dfb0 0013ddc0 ecac8b10 802219a8 00000000 2b0e41d0 e434dfac 00000000 df80: 00000000 00346310 00000036 8020029c 84b86c00 00000036 00000000 e434dfa8 dfa0: 80200060 80582004 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f970dc dfe0: 76f96e88 76f96e78 00018734 0012fc20 60000010 00000003 00000000 00000000 Call trace: [<81401130>] (parport_attach) from [<813fced0>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e25404 r4:829d3948 [<813fcdc4>] (comedi_device_attach) from [<813f8800>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:8451e6f0 r9:00000003 r8:84b86c00 r7:40946400 r6:b5403587 r5:8451e6c0 r4:200000c0 [<813f872c>] (do_devconfig_ioctl) from [<813f9380>] (comedi_unlocked_ioctl+0x104/0x1c88 drivers/comedi/comedi_fops.c:2240) r8:84b86c00 r7:40946400 r6:200000c0 r5:8451e6c0 r4:84d3bf00 [<813f927c>] (comedi_unlocked_ioctl) from [<8058223c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813f927c>] (comedi_unlocked_ioctl) from [<8058223c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813f927c>] (comedi_unlocked_ioctl) from [<8058223c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813f927c>] (comedi_unlocked_ioctl) from [<8058223c>] (sys_ioctl+0x244/0xb58 fs/ioctl.c:583) r10:84b86c00 r9:00000003 r8:84d3bf00 r7:200000c0 r6:40946400 r5:84d3bf01 r4:00000000 [<80581ff8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe434dfa8 to 0xe434dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f970dc dfe0: 76f96e88 76f96e78 00018734 0012fc20 r10:00000036 r9:84b86c00 r8:8020029c r7:00000036 r6:00346310 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