8<--- cut here --- Unable to handle kernel paging request at virtual address fee02f00 when write [fee02f00] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 5157 Comm: syz.0.140 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 : [<813ac7d0>] lr : [<813ac7c0>] psr: 60000013 sp : dfdadd30 ip : dfdadd30 fp : dfdadd54 r10: 82b16f40 r9 : 00000003 r8 : 840fb540 r7 : dfdadd90 r6 : 840fb540 r5 : 00000000 r4 : 00000000 r3 : fee02f00 r2 : 81e15644 r1 : 00000001 r0 : 813ac440 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85ae1780 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 840fb540 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfdac000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 840fb540 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 0xdfdac000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfdac000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.0.140 (pid: 5157, stack limit = 0xdfdac000) Stack: (0xdfdadd30 to 0xdfdae000) dd20: 823fef98 840fb540 829cf9ec 829cf9ec dd40: 81e15b04 840fb584 dfdadd8c dfdadd58 813a8868 813ac668 20000300 00000000 dd60: dfdadd7c 20000300 840fb540 b5403587 20000300 84168000 40946400 00000001 dd80: dfdade4c dfdadd90 813a43b4 813a876c 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00002f00 00000005 0000d09a ffffffff 00000003 fffffffe 20000004 ddc0: 00000003 00000ffe 7fffffff 0000000c 00000002 00000004 00000008 0000ffff dde0: 00000006 00000005 000007ff 00000830 00000008 00010000 00000009 00000800 de00: 00000101 00000002 00008001 00000007 00000003 00000004 0000000a 0000070f de20: 00000000 df93f53d 00000000 8595f480 840fb540 20000300 20000300 84168000 de40: dfdadf14 dfdade50 813a5380 813a42c0 00000000 00000000 00000000 df93f53d de60: 00000000 00000000 8247154c 0000005f 8405de58 840fb570 841424d4 84168000 de80: dfdadee4 dfdade90 80797c9c 8078e000 00000064 00000001 00000000 dfdadeac dea0: 84dd69d0 834335d8 00006400 0000000b dfdadea0 00000000 00000000 df93f53d dec0: 8595f480 40946400 20000300 20000300 8595f480 00000003 dfdadef4 dfdadee8 dee0: 80797dbc df93f53d dfdadf14 40946400 00000000 8595f481 20000300 8595f480 df00: 00000003 84168000 dfdadfa4 dfdadf18 8056ce9c 813a4db0 ecac8b10 84168000 df20: dfdadf3c dfdadf30 81a3b058 81a3af28 dfdadf54 dfdadf40 8025e490 8028ef6c df40: dfdadfb0 40000000 dfdadf84 dfdadf58 802229ec 8025e44c 00000000 8281cddc df60: dfdadfb0 0014c800 ecac8b10 80222940 00000000 df93f53d dfdadfac 00000000 df80: 00000000 00306308 00000036 8020029c 84168000 00000036 00000000 dfdadfa8 dfa0: 80200060 8056cd78 00000000 00000000 00000003 40946400 20000300 00000000 dfc0: 00000000 00000000 00306308 00000036 002f0000 00000000 00006364 76f6d0bc dfe0: 76f6cec0 76f6ceb0 0001948c 001322a0 60000010 00000003 00000000 00000000 Call trace: [<813ac65c>] (parport_attach) from [<813a8868>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:840fb584 r5:81e15b04 r4:829cf9ec [<813a8760>] (comedi_device_attach) from [<813a43b4>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000001 r9:40946400 r8:84168000 r7:20000300 r6:b5403587 r5:840fb540 r4:20000300 [<813a42b4>] (do_devconfig_ioctl) from [<813a5380>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:84168000 r7:20000300 r6:20000300 r5:840fb540 r4:8595f480 [<813a4da4>] (comedi_unlocked_ioctl) from [<8056ce9c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a4da4>] (comedi_unlocked_ioctl) from [<8056ce9c>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a4da4>] (comedi_unlocked_ioctl) from [<8056ce9c>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a4da4>] (comedi_unlocked_ioctl) from [<8056ce9c>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:84168000 r9:00000003 r8:8595f480 r7:20000300 r6:8595f481 r5:00000000 r4:40946400 [<8056cd6c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfdadfa8 to 0xdfdadff0) dfa0: 00000000 00000000 00000003 40946400 20000300 00000000 dfc0: 00000000 00000000 00306308 00000036 002f0000 00000000 00006364 76f6d0bc dfe0: 76f6cec0 76f6ceb0 0001948c 001322a0 r10:00000036 r9:84168000 r8:8020029c r7:00000036 r6:00306308 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