8<--- cut here --- Unable to handle kernel paging request at virtual address fee04fa6 when write [fee04fa6] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 8449 Comm: syz.1.1288 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 : [<81434384>] lr : [<81434374>] psr: 60000013 sp : e44d5d30 ip : e44d5d30 fp : e44d5d54 r10: 82b2f06c r9 : 00000003 r8 : 8301bd80 r7 : e44d5d90 r6 : 8301bd80 r5 : 00000000 r4 : 00000000 r3 : fee04fa6 r2 : 81e24af8 r1 : 00000001 r0 : 81433ff4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85f25a00 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 8301bd80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe44d4000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r8 information: slab kmalloc-192 start 8301bd80 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 0xe44d4000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r12 information: 2-page vmalloc region starting at 0xe44d4000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Process syz.1.1288 (pid: 8449, stack limit = 0xe44d4000) Stack: (0xe44d5d30 to 0xe44d6000) 5d20: 82444c4c 8301bd80 829d675c 829d675c 5d40: 81e24fb8 00000000 e44d5d8c e44d5d58 8142fefc 8143421c 40946400 00000000 5d60: e44d5d7c 200000c0 8301bd80 b5403587 40946400 00000003 00000003 84731880 5d80: e44d5e4c e44d5d90 8142b708 8142fdfc 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00004fa6 00000105 00000004 10000421 02000001 00400cc5 7ffffffe 5dc0: 5c952398 00000005 000003ff 00000002 00000300 fffffffe 00000001 00000009 5de0: 00000000 00040400 00000009 00000002 000001ff 80000089 0000000a 01400000 5e00: 20001e54 0000000d 00000003 00000001 00000005 00000004 07ffffff 00004857 5e20: 00000000 a4da0606 00000000 85338300 8301bd80 200000c0 40946400 00000003 5e40: e44d5f14 e44d5e50 8142ca2c 8142b640 00000000 a4da0606 00000000 00000000 5e60: 824b957c e44d5ea4 0000005f 8441e640 00000064 8301bdb0 e44d5ee4 e44d5e88 5e80: 807cf790 807c5b68 00000064 00000001 00000000 e44d5ea4 83873e50 834e9aa0 5ea0: 00006400 0000000b e44d5e98 00000000 00000000 a4da0606 00000000 85338300 5ec0: 40946400 200000c0 200000c0 85338300 00000003 84731880 e44d5ef4 e44d5ee8 5ee0: 807cf8c0 a4da0606 e44d5f14 00000000 85338301 40946400 200000c0 85338300 5f00: 00000003 84731880 e44d5fa4 e44d5f18 80590c2c 8142c6e4 ecac8b10 84731880 5f20: e44d5f3c e44d5f30 81ae53d4 81ae52a0 e44d5f54 e44d5f40 8025a87c 8028c380 5f40: e44d5fb0 40000000 e44d5f84 e44d5f58 80220bf8 8025a838 00000000 8281d2fc 5f60: e44d5fb0 0013e480 ecac8b10 80220b4c 00000000 a4da0606 e44d5fac 00000000 5f80: 00000000 00346310 00000036 8020029c 84731880 00000036 00000000 e44d5fa8 5fa0: 80200060 805909f4 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fb00dc 5fe0: 76fafe88 76fafe78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<81434210>] (parport_attach) from [<8142fefc>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e24fb8 r4:829d675c [<8142fdf0>] (comedi_device_attach) from [<8142b708>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:84731880 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301bd80 r4:200000c0 [<8142b634>] (do_devconfig_ioctl) from [<8142ca2c>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:8301bd80 r4:85338300 [<8142c6d8>] (comedi_unlocked_ioctl) from [<80590c2c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142c6d8>] (comedi_unlocked_ioctl) from [<80590c2c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142c6d8>] (comedi_unlocked_ioctl) from [<80590c2c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142c6d8>] (comedi_unlocked_ioctl) from [<80590c2c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84731880 r9:00000003 r8:85338300 r7:200000c0 r6:40946400 r5:85338301 r4:00000000 [<805909e8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe44d5fa8 to 0xe44d5ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fb00dc 5fe0: 76fafe88 76fafe78 00018ba0 001302e0 r10:00000036 r9:84731880 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