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: 11931 Comm: syz.7.1438 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 : [<813acae0>] lr : [<813acad0>] psr: 60000013 sp : dfcbdd30 ip : dfcbdd30 fp : dfcbdd54 r10: 82b16f40 r9 : 00000003 r8 : 83d0e600 r7 : dfcbdd90 r6 : 83d0e600 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e15684 r1 : 00000001 r0 : 813ac750 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85a8b8c0 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 83d0e600 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfcbc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 83d0e600 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 0xdfcbc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfcbc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.7.1438 (pid: 11931, stack limit = 0xdfcbc000) Stack: (0xdfcbdd30 to 0xdfcbe000) dd20: 823ff180 83d0e600 829cf9ac 829cf9ac dd40: 81e15b44 83d0e644 dfcbdd8c dfcbdd58 813a8b7c 813ac978 20000200 00000000 dd60: dfcbdd7c 20000200 83d0e600 b5403587 20000200 85b75400 40946400 00000003 dd80: dfcbde4c dfcbdd90 813a46c8 813a8a80 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00008001 fffffff4 00000001 00000007 00000003 00000ccb 00000008 ddc0: 000000ab 0000000d 00000100 ffffffff 0000befa 00000005 00000001 00000006 dde0: ffffffff 00000001 0001a449 00000003 40000003 00000089 00000002 00000009 de00: 20001e58 00000005 00000008 0000003c 0000000a 0000000c 00000004 0000000d de20: 00000000 55d2cd6d 00000000 858fe000 83d0e600 20000200 20000200 85b75400 de40: dfcbdf14 dfcbde50 813a5694 813a45d4 00000000 00000000 00000000 55d2cd6d de60: 00000000 00000000 8247154c 0000005f 83fbea58 83d0e630 841883b4 85b75400 de80: dfcbdee4 dfcbde90 80797ecc 8078e230 00000064 00000001 00000000 dfcbdeac dea0: 85a70610 834def68 00006400 0000000b dfcbdea0 00000000 00000000 55d2cd6d dec0: 858fe000 40946400 20000200 20000200 858fe000 00000003 dfcbdef4 dfcbdee8 dee0: 80797fec 55d2cd6d dfcbdf14 40946400 00000000 858fe001 20000200 858fe000 df00: 00000003 85b75400 dfcbdfa4 dfcbdf18 8056d0cc 813a50c4 ecac8b10 85b75400 df20: dfcbdf3c dfcbdf30 81a3b4b8 81a3b388 dfcbdf54 dfcbdf40 8025e490 8028ef6c df40: dfcbdfb0 40000000 dfcbdf84 dfcbdf58 802229ec 8025e44c 00000000 8281cddc df60: dfcbdfb0 0014ca70 ecac8b10 80222940 00000000 55d2cd6d dfcbdfac 00000000 df80: 00000000 00316308 00000036 8020029c 85b75400 00000036 00000000 dfcbdfa8 dfa0: 80200060 8056cfa8 00000000 00000000 00000003 40946400 20000200 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f120bc dfe0: 76f11ec0 76f11eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813ac96c>] (parport_attach) from [<813a8b7c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:83d0e644 r5:81e15b44 r4:829cf9ac [<813a8a74>] (comedi_device_attach) from [<813a46c8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85b75400 r7:20000200 r6:b5403587 r5:83d0e600 r4:20000200 [<813a45c8>] (do_devconfig_ioctl) from [<813a5694>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:85b75400 r7:20000200 r6:20000200 r5:83d0e600 r4:858fe000 [<813a50b8>] (comedi_unlocked_ioctl) from [<8056d0cc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a50b8>] (comedi_unlocked_ioctl) from [<8056d0cc>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a50b8>] (comedi_unlocked_ioctl) from [<8056d0cc>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a50b8>] (comedi_unlocked_ioctl) from [<8056d0cc>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:85b75400 r9:00000003 r8:858fe000 r7:20000200 r6:858fe001 r5:00000000 r4:40946400 [<8056cf9c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfcbdfa8 to 0xdfcbdff0) dfa0: 00000000 00000000 00000003 40946400 20000200 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f120bc dfe0: 76f11ec0 76f11eb0 000195a4 00132510 r10:00000036 r9:85b75400 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