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: 16745 Comm: syz.1.2626 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 : [<813ab660>] lr : [<813ab650>] psr: 60000013 sp : df9e9d30 ip : df9e9d30 fp : df9e9d54 r10: 82b16f00 r9 : 00000003 r8 : 83f4ac00 r7 : df9e9d90 r6 : 83f4ac00 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15364 r1 : 00000001 r0 : 813ab2d0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 856e9bc0 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 83f4ac00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf9e8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 83f4ac00 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 0xdf9e8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdf9e8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.1.2626 (pid: 16745, stack limit = 0xdf9e8000) Stack: (0xdf9e9d30 to 0xdf9ea000) 9d20: df9e9d4c df9e9d40 829cf92c 829cf92c 9d40: 81e15824 83f4ac44 df9e9d8c df9e9d58 813a76f8 813ab4f8 200000c0 00000000 9d60: df9e9d7c 200000c0 83f4ac00 b5403587 200000c0 84144800 40946400 00000003 9d80: df9e9e4c df9e9d90 813a3278 813a75fc 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004f27 00000000 00000008 00000006 00000005 00000005 00000009 9dc0: 00000007 54c6cff3 000000fd 00000002 00008401 00000006 5da31c5d 00000006 9de0: 00000101 00000000 00000892 0000a418 40000001 00000005 0000caa3 00000008 9e00: 20001e5b 00000000 00000e66 00000004 00000008 00000005 00000000 fffffff8 9e20: 00000000 bedff43d 00000000 84ed5a80 83f4ac00 200000c0 200000c0 84144800 9e40: df9e9f14 df9e9e50 813a4244 813a3184 00000000 00000000 00000000 bedff43d 9e60: 00000000 00000000 8247054c 0000005f 83ce5e58 83f4ac30 840f1d8c 84144800 9e80: df9e9ee4 df9e9e90 807979b4 8078dd18 00000064 00000001 00000000 df9e9eac 9ea0: 847b5850 834e6770 00006400 0000000b df9e9ea0 00000000 00000000 bedff43d 9ec0: 84ed5a80 40946400 200000c0 200000c0 84ed5a80 00000003 df9e9ef4 df9e9ee8 9ee0: 80797ad4 bedff43d df9e9f14 40946400 00000000 84ed5a81 200000c0 84ed5a80 9f00: 00000003 84144800 df9e9fa4 df9e9f18 8056cd60 813a3c74 ecac8b10 84144800 9f20: df9e9f3c df9e9f30 81a394b8 81a39388 df9e9f54 df9e9f40 8025e490 8028ef64 9f40: df9e9fb0 40000000 df9e9f84 df9e9f58 802229ec 8025e44c 00000000 8281cddc 9f60: df9e9fb0 0014c820 ecac8b10 80222940 00000000 bedff43d df9e9fac 00000000 9f80: 00000000 002f6308 00000036 8020029c 84144800 00000036 00000000 df9e9fa8 9fa0: 80200060 8056cc3c 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fa30bc 9fe0: 76fa2ec0 76fa2eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813ab4ec>] (parport_attach) from [<813a76f8>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:83f4ac44 r5:81e15824 r4:829cf92c [<813a75f0>] (comedi_device_attach) from [<813a3278>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:84144800 r7:200000c0 r6:b5403587 r5:83f4ac00 r4:200000c0 [<813a3178>] (do_devconfig_ioctl) from [<813a4244>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:84144800 r7:200000c0 r6:200000c0 r5:83f4ac00 r4:84ed5a80 [<813a3c68>] (comedi_unlocked_ioctl) from [<8056cd60>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3c68>] (comedi_unlocked_ioctl) from [<8056cd60>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3c68>] (comedi_unlocked_ioctl) from [<8056cd60>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3c68>] (comedi_unlocked_ioctl) from [<8056cd60>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:84144800 r9:00000003 r8:84ed5a80 r7:200000c0 r6:84ed5a81 r5:00000000 r4:40946400 [<8056cc30>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9e9fa8 to 0xdf9e9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fa30bc 9fe0: 76fa2ec0 76fa2eb0 0001948c 001322c0 r10:00000036 r9:84144800 r8:8020029c r7:00000036 r6:002f6308 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