8<--- cut here --- Unable to handle kernel paging request at virtual address fee08001 when write [fee08001] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 1328 Comm: syz.0.10413 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 : [<813ac988>] lr : [<813ac978>] psr: 60000013 sp : dfa19d30 ip : dfa19d30 fp : dfa19d54 r10: 82b16f40 r9 : 00000003 r8 : 84194a80 r7 : dfa19d90 r6 : 84194a80 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e15644 r1 : 00000001 r0 : 813ac5f8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85a92440 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 84194a80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa18000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 84194a80 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 0xdfa18000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfa18000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.0.10413 (pid: 1328, stack limit = 0xdfa18000) Stack: (0xdfa19d30 to 0xdfa1a000) 9d20: 823ff12c 84194a80 829cf9ac 829cf9ac 9d40: 81e15b04 84194ac4 dfa19d8c dfa19d58 813a8a20 813ac820 200000c0 00000000 9d60: dfa19d7c 200000c0 84194a80 b5403587 200000c0 85a60000 40946400 00000003 9d80: dfa19e4c dfa19d90 813a456c 813a8924 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00008001 00000006 00000001 00000000 00000000 00000cc7 00000008 9dc0: 00000007 0000000a 00000100 00001002 00000001 00000008 00000004 00000006 9de0: ffffffff 00000001 0001a449 00000003 40000003 00000089 00000002 00000f27 9e00: 00000006 00000007 00000008 00000005 00000008 00000004 00010000 fffffff8 9e20: 00000000 94e2341e 00000000 84884d80 84194a80 200000c0 200000c0 85a60000 9e40: dfa19f14 dfa19e50 813a5538 813a4478 00000000 00000000 00000000 94e2341e 9e60: 00000000 00000000 8247154c 0000005f 83d4dc58 84194ab0 841a987c 85a60000 9e80: dfa19ee4 dfa19e90 80797ecc 8078e230 00000064 00000001 00000000 dfa19eac 9ea0: 8480d0d0 834355d8 00006400 0000000b dfa19ea0 00000000 00000000 94e2341e 9ec0: 84884d80 40946400 200000c0 200000c0 84884d80 00000003 dfa19ef4 dfa19ee8 9ee0: 80797fec 94e2341e dfa19f14 40946400 00000000 84884d81 200000c0 84884d80 9f00: 00000003 85a60000 dfa19fa4 dfa19f18 8056d0cc 813a4f68 ecac8b10 85a60000 9f20: dfa19f3c dfa19f30 81a3b378 81a3b248 dfa19f54 dfa19f40 8025e490 8028ef6c 9f40: dfa19fb0 40000000 dfa19f84 dfa19f58 802229ec 8025e44c 00000000 8281cddc 9f60: dfa19fb0 0014c800 ecac8b10 80222940 00000000 94e2341e dfa19fac 00000000 9f80: 00000000 00306308 00000036 8020029c 85a60000 00000036 00000000 dfa19fa8 9fa0: 80200060 8056cfa8 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00306308 00000036 002f0000 00000000 00006364 76f5d0bc 9fe0: 76f5cec0 76f5ceb0 0001948c 001322a0 60000010 00000003 00000000 00000000 Call trace: [<813ac814>] (parport_attach) from [<813a8a20>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:84194ac4 r5:81e15b04 r4:829cf9ac [<813a8918>] (comedi_device_attach) from [<813a456c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85a60000 r7:200000c0 r6:b5403587 r5:84194a80 r4:200000c0 [<813a446c>] (do_devconfig_ioctl) from [<813a5538>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:85a60000 r7:200000c0 r6:200000c0 r5:84194a80 r4:84884d80 [<813a4f5c>] (comedi_unlocked_ioctl) from [<8056d0cc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a4f5c>] (comedi_unlocked_ioctl) from [<8056d0cc>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a4f5c>] (comedi_unlocked_ioctl) from [<8056d0cc>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a4f5c>] (comedi_unlocked_ioctl) from [<8056d0cc>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:85a60000 r9:00000003 r8:84884d80 r7:200000c0 r6:84884d81 r5:00000000 r4:40946400 [<8056cf9c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa19fa8 to 0xdfa19ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00306308 00000036 002f0000 00000000 00006364 76f5d0bc 9fe0: 76f5cec0 76f5ceb0 0001948c 001322a0 r10:00000036 r9:85a60000 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