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: 1 UID: 0 PID: 15366 Comm: syz.2.2227 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 : [<813ce498>] lr : [<813ce488>] psr: 60000013 sp : e015dd30 ip : e015dd30 fp : e015dd54 r10: 82b25910 r9 : 00000003 r8 : 8414f0c0 r7 : e015dd90 r6 : 8414f0c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e177dc r1 : 00000001 r0 : 813ce108 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85a67740 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 8414f0c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe015c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 8414f0c0 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 0xe015c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xe015c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.2.2227 (pid: 15366, stack limit = 0xe015c000) Stack: (0xe015dd30 to 0xe015e000) dd20: 823f12fc 8414f0c0 829d1bf4 829d1bf4 dd40: 81e17c9c 8414f104 e015dd8c e015dd58 813ca528 813ce330 200000c0 00000000 dd60: e015dd7c 200000c0 8414f0c0 b5403587 200000c0 832eec00 40946400 00000003 dd80: e015de4c e015dd90 813c6074 813ca42c 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00004f27 00000003 00000008 00000006 00000005 00000005 00000009 ddc0: 00000007 54c6cff3 000000fd 00000008 00008403 00000006 5da31c5d 00000006 dde0: 00000101 00000000 00000892 0000a418 40000001 00000005 0000caa3 00000008 de00: 20001e5b 00000005 00000e66 00000004 00000008 00000005 fffffffe fffffff8 de20: 00000000 de4abd58 00000000 85d23000 8414f0c0 200000c0 200000c0 832eec00 de40: e015df14 e015de50 813c7040 813c5f80 00000000 00000000 00000000 de4abd58 de60: 00000000 00000000 824625b4 0000005f 83d96640 8414f0f0 8415fb4c 832eec00 de80: e015dee4 e015de90 807a755c 8079d954 00000064 00000001 00000000 e015deac dea0: 90b9dcd0 83433ee0 00006400 0000000b e015dea0 00000000 00000000 de4abd58 dec0: 85d23000 40946400 200000c0 200000c0 85d23000 00000003 e015def4 e015dee8 dee0: 807a767c de4abd58 e015df14 40946400 00000000 85d23001 200000c0 85d23000 df00: 00000003 832eec00 e015dfa4 e015df18 80578798 813c6a70 ecac8b10 832eec00 df20: e015df3c e015df30 81a606d8 81a605a8 e015df54 e015df40 8025c484 8028d914 df40: e015dfb0 40000000 e015df84 e015df58 802229ec 8025c440 00000000 8281cfb4 df60: e015dfb0 0014ca70 ecac8b10 80222940 00000000 de4abd58 e015dfac 00000000 df80: 00000000 00316308 00000036 8020029c 832eec00 00000036 00000000 e015dfa8 dfa0: 80200060 80578674 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f410bc dfe0: 76f40ec0 76f40eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813ce324>] (parport_attach) from [<813ca528>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:8414f104 r5:81e17c9c r4:829d1bf4 [<813ca420>] (comedi_device_attach) from [<813c6074>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:832eec00 r7:200000c0 r6:b5403587 r5:8414f0c0 r4:200000c0 [<813c5f74>] (do_devconfig_ioctl) from [<813c7040>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:832eec00 r7:200000c0 r6:200000c0 r5:8414f0c0 r4:85d23000 [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:832eec00 r9:00000003 r8:85d23000 r7:200000c0 r6:85d23001 r5:00000000 r4:40946400 [<80578668>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe015dfa8 to 0xe015dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f410bc dfe0: 76f40ec0 76f40eb0 000195a4 00132510 r10:00000036 r9:832eec00 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