8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 6519 Comm: syz.1.779 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 : [<813acdb8>] lr : [<813acda8>] psr: 60000013 sp : dfe65d30 ip : dfe65d30 fp : dfe65d54 r10: 82b16f40 r9 : 00000003 r8 : 83dcdcc0 r7 : dfe65d90 r6 : 83dcdcc0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15684 r1 : 00000001 r0 : 813aca28 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85a8f840 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 83dcdcc0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfe64000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 83dcdcc0 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 0xdfe64000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfe64000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.1.779 (pid: 6519, stack limit = 0xdfe64000) Stack: (0xdfe65d30 to 0xdfe66000) 5d20: 823ff1e0 83dcdcc0 829cf9ac 829cf9ac 5d40: 81e15b44 83dcdd04 dfe65d8c dfe65d58 813a8e54 813acc50 200003c0 00000000 5d60: dfe65d7c 200003c0 83dcdcc0 b5403587 200003c0 8407a400 40946400 00000000 5d80: dfe65e4c dfe65d90 813a49a0 813a8d58 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00004f27 0000000b 00000000 000004cd 00000005 00000006 00040004 5dc0: 00000007 7fffffff 00000104 00000007 00000fff 00000005 00020003 00000009 5de0: 00000101 00000003 80000000 00000005 40000003 00000087 0000caab 0000000e 5e00: ffffffff 0000000b 00000e69 0000003c 0000000c 00008000 000003a0 00000003 5e20: 00000000 e5c64ad4 00000001 859d2900 83dcdcc0 200003c0 200003c0 8407a400 5e40: dfe65f14 dfe65e50 813a596c 813a48ac 00000001 00000001 81a3f724 dddcf080 5e60: 00000000 8280c960 00000000 00000004 81c01b44 83dcdcf0 00000002 e5c64ad4 5e80: 80291574 00000000 8407a400 ffffffff dfe65efc 80200c04 8407a400 8407a400 5ea0: dfe65ec4 dfe65eb0 81a3f730 8028f00c 813a5390 a0000013 dfe65fa4 dfe65ec8 5ec0: 80200c24 81a3f6f0 859d2900 40946400 200003c0 813a5390 40946400 00000000 5ee0: 859d2901 e5c64ad4 859d2900 40946400 00000000 859d2901 200003c0 859d2900 5f00: 00000003 8407a400 dfe65fa4 dfe65f18 8056d084 813a539c ecac8b10 8407a400 5f20: dfe65f3c dfe65f30 81a3b7f8 81a3b6c8 dfe65f54 dfe65f40 8025e490 8028f00c 5f40: dfe65fb0 40000000 dfe65f84 dfe65f58 802229ec 8025e44c 00000000 8281cddc 5f60: dfe65fb0 0014ca70 ecac8b10 80222940 00000000 e5c64ad4 dfe65fac 00000000 5f80: 00000000 00316308 00000036 8020029c 8407a400 00000036 00000000 dfe65fa8 5fa0: 80200060 8056cf60 00000000 00000000 00000003 40946400 200003c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fc30bc 5fe0: 76fc2ec0 76fc2eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813acc44>] (parport_attach) from [<813a8e54>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:83dcdd04 r5:81e15b44 r4:829cf9ac [<813a8d4c>] (comedi_device_attach) from [<813a49a0>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000000 r9:40946400 r8:8407a400 r7:200003c0 r6:b5403587 r5:83dcdcc0 r4:200003c0 [<813a48a0>] (do_devconfig_ioctl) from [<813a596c>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:8407a400 r7:200003c0 r6:200003c0 r5:83dcdcc0 r4:859d2900 [<813a5390>] (comedi_unlocked_ioctl) from [<8056d084>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a5390>] (comedi_unlocked_ioctl) from [<8056d084>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a5390>] (comedi_unlocked_ioctl) from [<8056d084>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a5390>] (comedi_unlocked_ioctl) from [<8056d084>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:8407a400 r9:00000003 r8:859d2900 r7:200003c0 r6:859d2901 r5:00000000 r4:40946400 [<8056cf54>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfe65fa8 to 0xdfe65ff0) 5fa0: 00000000 00000000 00000003 40946400 200003c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fc30bc 5fe0: 76fc2ec0 76fc2eb0 000195a4 00132510 r10:00000036 r9:8407a400 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