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: 4696 Comm: syz.2.128 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 : [<813ce690>] lr : [<813ce680>] psr: 60000013 sp : ea2bdd30 ip : ea2bdd30 fp : ea2bdd54 r10: 82b25910 r9 : 00000003 r8 : 842003c0 r7 : ea2bdd90 r6 : 842003c0 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e177dc r1 : 00000001 r0 : 813ce300 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 856e2d40 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 842003c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea2bc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 842003c0 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 0xea2bc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xea2bc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.2.128 (pid: 4696, stack limit = 0xea2bc000) Stack: (0xea2bdd30 to 0xea2be000) dd20: 823f13b8 842003c0 ea2bdd58 829d1bf4 dd40: 81e17c9c 84200404 ea2bdd8c ea2bdd58 813ca720 813ce528 200000c0 00000000 dd60: ea2bdd7c 200000c0 842003c0 b5403587 200000c0 83b09800 40946400 00000003 dd80: ea2bde4c ea2bdd90 813c626c 813ca624 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00008001 ffffff01 00000001 00000000 00000002 00000cc7 00000008 ddc0: 00000007 0000000a 00000100 00000002 00000001 00000008 01100004 00000006 dde0: 00000009 00000001 0001a449 00000003 40000003 00000089 00000002 00000f27 de00: 00000006 0000800b 00000008 00000005 00000008 00000008 00010000 fffffff7 de20: 00000000 309dac4b 00000000 84994540 842003c0 200000c0 200000c0 83b09800 de40: ea2bdf14 ea2bde50 813c7238 813c6178 00000000 00000000 00000000 309dac4b de60: 00000000 00000000 824625b4 0000005f 83ebbbe8 842003f0 8422824c 83b09800 de80: ea2bdee4 ea2bde90 807a7684 8079da7c 00000064 00000001 00000000 ea2bdeac dea0: 84f91e50 834de908 00006400 0000000b ea2bdea0 00000000 00000000 309dac4b dec0: 84994540 40946400 200000c0 200000c0 84994540 00000003 ea2bdef4 ea2bdee8 dee0: 807a77a4 309dac4b ea2bdf14 40946400 00000000 84994541 200000c0 84994540 df00: 00000003 83b09800 ea2bdfa4 ea2bdf18 805788b8 813c6c68 ecac8b10 83b09800 df20: ea2bdf3c ea2bdf30 81a60ab8 81a60988 ea2bdf54 ea2bdf40 8025c484 8028d914 df40: ea2bdfb0 40000000 ea2bdf84 ea2bdf58 802229ec 8025c440 00000000 8281cfb4 df60: ea2bdfb0 0014ca70 ecac8b10 80222940 00000000 309dac4b ea2bdfac 00000000 df80: 00000000 00316308 00000036 8020029c 83b09800 00000036 00000000 ea2bdfa8 dfa0: 80200060 80578794 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f370bc dfe0: 76f36ec0 76f36eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813ce51c>] (parport_attach) from [<813ca720>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:84200404 r5:81e17c9c r4:829d1bf4 [<813ca618>] (comedi_device_attach) from [<813c626c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83b09800 r7:200000c0 r6:b5403587 r5:842003c0 r4:200000c0 [<813c616c>] (do_devconfig_ioctl) from [<813c7238>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83b09800 r7:200000c0 r6:200000c0 r5:842003c0 r4:84994540 [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83b09800 r9:00000003 r8:84994540 r7:200000c0 r6:84994541 r5:00000000 r4:40946400 [<80578788>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea2bdfa8 to 0xea2bdff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f370bc dfe0: 76f36ec0 76f36eb0 000195a4 00132510 r10:00000036 r9:83b09800 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