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: 1777 Comm: syz.1.6976 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 : [<813ce6a8>] lr : [<813ce698>] psr: 60000013 sp : ea61dd30 ip : ea61dd30 fp : ea61dd54 r10: 82b25910 r9 : 00000003 r8 : 84240180 r7 : ea61dd90 r6 : 84240180 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e177dc r1 : 00000001 r0 : 813ce318 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85f66800 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 84240180 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea61c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 84240180 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 0xea61c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xea61c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.1.6976 (pid: 1777, stack limit = 0xea61c000) Stack: (0xea61dd30 to 0xea61e000) dd20: 823f13b8 84240180 829d1bf4 829d1bf4 dd40: 81e17c9c 842401c4 ea61dd8c ea61dd58 813ca738 813ce540 200000c0 00000000 dd60: ea61dd7c 200000c0 84240180 b5403587 200000c0 85734800 40946400 00000003 dd80: ea61de4c ea61dd90 813c6284 813ca63c 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 3aaccde2 00000000 86c40900 84240180 200000c0 200000c0 85734800 de40: ea61df14 ea61de50 813c7250 813c6190 00000000 ea61de54 ea61de54 3aaccde2 de60: 00000000 00000000 824625b4 0000005f 84028c28 842401b0 84184c24 85734800 de80: ea61dee4 ea61de90 807a7684 8079da7c 00000064 00000001 00000000 ea61deac dea0: 84c6b3d0 834e6a18 00006400 0000000b ea61dea0 00000000 ea61dd30 3aaccde2 dec0: 86c40900 40946400 200000c0 200000c0 86c40900 00000003 ea61def4 ea61dee8 dee0: 807a77a4 3aaccde2 ea61df14 40946400 00000000 86c40901 200000c0 86c40900 df00: 00000003 85734800 ea61dfa4 ea61df18 805788b8 813c6c80 ecac8b10 85734800 df20: ea61df3c ea61df30 81a60ad8 81a609a8 ea61df54 ea61df40 8025c484 8028d914 df40: ea61dfb0 40000000 ea61df84 ea61df58 802229ec 8025c440 00000000 8281cfb4 df60: ea61dfb0 0014ced0 ecac8b10 80222940 00000000 3aaccde2 ea61dfac 00000000 df80: 00000000 00316308 00000036 8020029c 85734800 00000036 00000000 ea61dfa8 dfa0: 80200060 80578794 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f000bc dfe0: 76effec0 76effeb0 0001928c 00132970 60000010 00000003 00000000 00000000 Call trace: [<813ce534>] (parport_attach) from [<813ca738>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:842401c4 r5:81e17c9c r4:829d1bf4 [<813ca630>] (comedi_device_attach) from [<813c6284>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85734800 r7:200000c0 r6:b5403587 r5:84240180 r4:200000c0 [<813c6184>] (do_devconfig_ioctl) from [<813c7250>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:85734800 r7:200000c0 r6:200000c0 r5:84240180 r4:86c40900 [<813c6c74>] (comedi_unlocked_ioctl) from [<805788b8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6c74>] (comedi_unlocked_ioctl) from [<805788b8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6c74>] (comedi_unlocked_ioctl) from [<805788b8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6c74>] (comedi_unlocked_ioctl) from [<805788b8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85734800 r9:00000003 r8:86c40900 r7:200000c0 r6:86c40901 r5:00000000 r4:40946400 [<80578788>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea61dfa8 to 0xea61dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f000bc dfe0: 76effec0 76effeb0 0001928c 00132970 r10:00000036 r9:85734800 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