Unable to handle kernel paging request at virtual address fee0afff when write [fee0afff] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 10705 Comm: syz.8.989 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 : [<81433a34>] lr : [<81433a24>] psr: 60000013 sp : e84a9d30 ip : e84a9d30 fp : e84a9d54 r10: 82b2f064 r9 : 00000003 r8 : 8337e180 r7 : e84a9d90 r6 : 8337e180 r5 : 00000000 r4 : 00000000 r3 : fee0afff r2 : 81e24a18 r1 : 00000001 r0 : 814336a4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8409b0c0 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 8337e180 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe84a8000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r8 information: slab kmalloc-192 start 8337e180 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 0xe84a8000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xe84a8000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.8.989 (pid: 10705, stack limit = 0xe84a8000) Stack: (0xe84a9d30 to 0xe84aa000) 9d20: 82444a50 8337e180 829d6700 829d6700 9d40: 81e24ed8 00000000 e84a9d8c e84a9d58 8142f5ac 814338cc 40946400 00000000 9d60: e84a9d7c 20000240 8337e180 b5403587 40946400 00000002 00000003 85a3d400 9d80: e84a9e4c e84a9d90 8142adb8 8142f4ac 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 0000afff 00000033 80010000 00000004 00000008 0000208f 00000006 9dc0: 00008012 00001007 c0000000 10000005 fffffffd 00000001 00000000 00000005 9de0: fdfffffa 000000e8 00000006 00000009 0000008e 02000005 00000005 0000000f 9e00: 0000000b 00000004 00000005 0000b0c4 00000006 00020002 00400002 00000022 9e20: 00000000 a5f6f491 00000000 8688c000 8337e180 20000240 40946400 00000002 9e40: e84a9f14 e84a9e50 8142c0dc 8142acf0 e84a9e4c a5f6f491 00000000 00000000 9e60: 824b857c e84a9ea4 0000005f 8453a640 00000064 8337e1b0 e84a9ee4 e84a9e88 9e80: 807cf290 807c5668 00000064 00000001 00000000 e84a9ea4 864a96d0 834e7990 9ea0: 00006400 0000000b e84a9e98 00000000 e84a9d38 a5f6f491 00000000 8688c000 9ec0: 40946400 20000240 20000240 8688c000 00000003 85a3d400 e84a9ef4 e84a9ee8 9ee0: 807cf3c0 a5f6f491 e84a9f14 00000000 8688c001 40946400 20000240 8688c000 9f00: 00000003 85a3d400 e84a9fa4 e84a9f18 80590734 8142bd94 ecac8b10 85a3d400 9f20: e84a9f3c e84a9f30 81ae47b4 81ae4680 e84a9f54 e84a9f40 8025a864 8028c2d0 9f40: e84a9fb0 40000000 e84a9f84 e84a9f58 80220bf8 8025a820 00000000 8281d2bc 9f60: e84a9fb0 0013e480 ecac8b10 80220b4c 00000000 a5f6f491 e84a9fac 00000000 9f80: 00000000 00346310 00000036 8020029c 85a3d400 00000036 00000000 e84a9fa8 9fa0: 80200060 805904fc 00000000 00000000 00000003 40946400 20000240 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f6d0dc 9fe0: 76f6ce88 76f6ce78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<814338c0>] (parport_attach) from [<8142f5ac>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e24ed8 r4:829d6700 [<8142f4a0>] (comedi_device_attach) from [<8142adb8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:85a3d400 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:8337e180 r4:20000240 [<8142ace4>] (do_devconfig_ioctl) from [<8142c0dc>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000002 r7:40946400 r6:20000240 r5:8337e180 r4:8688c000 [<8142bd88>] (comedi_unlocked_ioctl) from [<80590734>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142bd88>] (comedi_unlocked_ioctl) from [<80590734>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142bd88>] (comedi_unlocked_ioctl) from [<80590734>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142bd88>] (comedi_unlocked_ioctl) from [<80590734>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:85a3d400 r9:00000003 r8:8688c000 r7:20000240 r6:40946400 r5:8688c001 r4:00000000 [<805904f0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe84a9fa8 to 0xe84a9ff0) 9fa0: 00000000 00000000 00000003 40946400 20000240 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f6d0dc 9fe0: 76f6ce88 76f6ce78 00018ba0 001302e0 r10:00000036 r9:85a3d400 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