8<--- cut here --- Unable to handle kernel paging request at virtual address fee02000 when write [fee02000] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 18748 Comm: syz.0.3840 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : e00add30 ip : e00add30 fp : e00add54 r10: 82d32f9c r9 : 00000003 r8 : 84653e40 r7 : e00add90 r6 : e00add90 r5 : 84653e40 r4 : 00000000 r3 : fee02000 r2 : 00000000 r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 853ecd80 DAC: fffffffd 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 84653e40 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xe00ac000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Register r7 information: 2-page vmalloc region starting at 0xe00ac000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Register r8 information: slab kmalloc-192 start 84653e40 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 0xe00ac000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Register r12 information: 2-page vmalloc region starting at 0xe00ac000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Process syz.0.3840 (pid: 18748, stack limit = 0xe00ac000) Stack: (0xe00add30 to 0xe00ae000) dd20: ffffffff 00000004 82bda4a4 81e2e9e8 dd40: 00000000 e00add90 e00add8c e00add58 8149c3e8 814a0708 40946400 00000000 dd60: e00add7c 20001a00 84653e40 b5403587 40946400 00000003 00000003 85a11880 dd80: e00ade4c e00add90 81497bec 8149c2ec 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00002000 00000020 00000004 20000001 00000025 00000000 00000400 ddc0: 00000002 54c6cff3 000000fd 00000002 00000001 fffffff7 00400000 00000002 dde0: 00000008 00000000 0000007f 00000003 40000003 00200089 00000002 00000004 de00: 00000000 00000003 00000007 00000003 00000006 00004006 00000000 00000003 de20: 00000000 b48678bb 00000000 8688b380 84653e40 20001a00 40946400 00000003 de40: e00adf14 e00ade50 81498f14 81497b2c e00ade4c b48678bb 00000000 00000000 de60: 8254e844 e00adea4 0000005f 84543c00 00000064 84653e70 e00adee4 e00ade88 de80: 8080b76c 80801e24 00000064 00000001 00000000 e00adea4 8380da10 83439088 dea0: 00006400 0000000b e00ade98 00000000 e00add38 b48678bb 00000000 8688b380 dec0: 40946400 20001a00 20001a00 8688b380 00000003 85a11880 e00adef4 e00adee8 dee0: 8080b8a0 b48678bb e00adf14 00000000 8688b381 40946400 20001a00 8688b380 df00: 00000003 85a11880 e00adfa4 e00adf18 805bdf78 81498bcc ecac8b10 85a11880 df20: e00adf3c e00adf30 81b6ec00 81b6eacc e00adf54 e00adf40 8025b878 8028f548 df40: e00adfb0 40000000 e00adf84 e00adf58 80221bdc 8025b834 00000000 82a1eb0c df60: e00adfb0 0013ebf0 ecac8b10 80221b30 00000000 b48678bb e00adfac 00000000 df80: 00000000 00356310 00000036 8020029c 85a11880 00000036 00000000 e00adfa8 dfa0: 80200060 805bdd40 00000000 00000000 00000003 40946400 20001a00 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f7d0dc dfe0: 76f7ce88 76f7ce78 00018fa0 00130a50 60000010 00000003 00000000 00000000 Call trace: [<814a06fc>] (parport_attach) from [<8149c3e8>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:e00add90 r6:00000000 r5:81e2e9e8 r4:82bda4a4 [<8149c2e0>] (comedi_device_attach) from [<81497bec>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:85a11880 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:84653e40 r4:20001a00 [<81497b20>] (do_devconfig_ioctl) from [<81498f14>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20001a00 r5:84653e40 r4:8688b380 [<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) r10:85a11880 r9:00000003 r8:8688b380 r7:20001a00 r6:40946400 r5:8688b381 r4:00000000 [<805bdd34>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe00adfa8 to 0xe00adff0) dfa0: 00000000 00000000 00000003 40946400 20001a00 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f7d0dc dfe0: 76f7ce88 76f7ce78 00018fa0 00130a50 r10:00000036 r9:85a11880 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