8<--- cut here --- Unable to handle kernel paging request at virtual address fee02f00 when write [fee02f00] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 5428 Comm: syz.0.491 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:99 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:243 [inline] PC is at parport_attach+0x5c/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:243 [inline] LR is at parport_attach+0x50/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 pc : [<814a0758>] lr : [<814a074c>] psr: 60000013 sp : e026dd30 ip : e026dd30 fp : e026dd54 r10: 82d32f9c r9 : 00000003 r8 : 830190c0 r7 : e026dd90 r6 : e026dd90 r5 : 830190c0 r4 : 00000000 r3 : fee02f00 r2 : 00000000 r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 864925c0 DAC: 00000000 Register r0 information: NULL pointer Register r1 information: NULL pointer Register r2 information: NULL pointer Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1048 Register r4 information: NULL pointer Register r5 information: slab kmalloc-192 start 830190c0 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xe026c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Register r7 information: 2-page vmalloc region starting at 0xe026c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Register r8 information: slab kmalloc-192 start 830190c0 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 0xe026c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Register r12 information: 2-page vmalloc region starting at 0xe026c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Process syz.0.491 (pid: 5428, stack limit = 0xe026c000) Stack: (0xe026dd30 to 0xe026e000) dd20: ffffffff 00000004 82bda4a4 81e2e9e8 dd40: 00000000 e026dd90 e026dd8c e026dd58 8149c3e8 814a0708 b5403587 00000000 dd60: 00000001 20000300 830190c0 b5403587 40946400 00000001 00000003 83183d40 dd80: e026de4c e026dd90 81497bec 8149c2ec 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00002f00 00000005 0000d09a ffffffff 00000003 fffffffe 20000004 ddc0: 00000003 00000ffe 7fffffff 00000005 00000002 00000004 00000008 0000ffff dde0: 00000006 00000002 000007ff 00000830 00000008 00010000 00000009 00000c4f de00: 00000101 00000002 00008001 00000004 00000003 00000000 00000002 0000070f de20: 00000000 94b9fd84 83183d40 86721100 830190c0 20000300 40946400 00000001 de40: e026df14 e026de50 81498f14 81497b2c 00000000 94b9fd84 00000000 00000000 de60: 8254e844 e026dea4 0000005f 84299a28 00000064 830190f0 e026dee4 e026de88 de80: 8080b76c 80801e24 00000064 00000001 00000000 e026dea4 85d00310 83427dd0 dea0: 00006400 0000000b e026de98 00000000 00000000 94b9fd84 00000000 86721100 dec0: 40946400 20000300 20000300 86721100 00000003 83183d40 e026def4 e026dee8 dee0: 8080b8a0 94b9fd84 e026df14 00000000 86721101 40946400 20000300 86721100 df00: 00000003 83183d40 e026dfa4 e026df18 805bdf78 81498bcc ecac8b10 83183d40 df20: e026df3c e026df30 81b6ec00 81b6eacc e026df54 e026df40 8025b878 8028f548 df40: e026dfb0 40000000 e026df84 e026df58 80221bdc 8025b834 00000000 82a1eb0c df60: e026dfb0 0013ebf0 ecac8b10 80221b30 00000000 94b9fd84 e026dfac 00000000 df80: 00000000 00356310 00000036 8020029c 83183d40 00000036 00000000 e026dfa8 dfa0: 80200060 805bdd40 00000000 00000000 00000003 40946400 20000300 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f4b0dc dfe0: 76f4ae88 76f4ae78 00018fa0 00130a50 60000010 00000003 00000000 00000000 Call trace: [<814a06fc>] (parport_attach) from [<8149c3e8>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:e026dd90 r6:00000000 r5:81e2e9e8 r4:82bda4a4 [<8149c2e0>] (comedi_device_attach) from [<81497bec>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:83183d40 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:830190c0 r4:20000300 [<81497b20>] (do_devconfig_ioctl) from [<81498f14>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000300 r5:830190c0 r4:86721100 [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83183d40 r9:00000003 r8:86721100 r7:20000300 r6:40946400 r5:86721101 r4:00000000 [<805bdd34>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe026dfa8 to 0xe026dff0) dfa0: 00000000 00000000 00000003 40946400 20000300 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f4b0dc dfe0: 76f4ae88 76f4ae78 00018fa0 00130a50 r10:00000036 r9:83183d40 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb6552a e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb6552a bl 0xfed954b0 4: e5953064 ldr r3, [r5, #100] @ 0x64 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction