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: 4653 Comm: syz.0.264 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:291 [inline] PC is at parport_attach+0x184/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] LR is at parport_attach+0x174/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<81459064>] lr : [<81459054>] psr: 60000013 sp : dfb5dd30 ip : dfb5dd30 fp : dfb5dd54 r10: 82d2cdc4 r9 : 00000003 r8 : 846a99c0 r7 : dfb5dd90 r6 : 846a99c0 r5 : 00000000 r4 : 00000000 r3 : fee02000 r2 : 81e276a8 r1 : 00000001 r0 : 81458cc4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 860e57c0 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:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 846a99c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb5c000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 846a99c0 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 0xdfb5c000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xdfb5c000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.0.264 (pid: 4653, stack limit = 0xdfb5c000) Stack: (0xdfb5dd30 to 0xdfb5e000) dd20: ffffffff 00000004 00000000 82bd2abc dd40: 81e27b68 00000000 dfb5dd8c dfb5dd58 81454bc8 81458eec 40946400 00000000 dd60: dfb5dd7c 20000180 846a99c0 b5403587 40946400 00000003 00000003 84649900 dd80: dfb5de4c dfb5dd90 814503d4 81454acc 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00002000 00000000 00000004 00000001 00000025 00000000 00000400 ddc0: 00000007 54c6cff3 000000fd 00000003 00000003 fffffff7 00400101 00000006 dde0: 00000002 00000000 0000007f 00000003 40000003 00000009 00000004 00000004 de00: 20001e5b 00000003 00002e66 00000003 00000006 00004006 00000000 00000003 de20: 00000000 aff15fbf 00000000 83a93900 846a99c0 20000180 40946400 00000003 de40: dfb5df14 dfb5de50 814516f8 8145030c 00000000 aff15fbf 00000000 00000000 de60: 82531804 dfb5dea4 0000005f 8486ad40 00000064 846a99f0 dfb5dee4 dfb5de88 de80: 807e97d0 807dfae4 00000064 00000001 00000000 dfb5dea4 830e8e50 835b5198 dea0: 00006400 0000000b dfb5de98 00000000 00000000 aff15fbf 00000000 83a93900 dec0: 40946400 20000180 20000180 83a93900 00000003 84649900 dfb5def4 dfb5dee8 dee0: 807e9904 aff15fbf dfb5df14 00000000 83a93901 40946400 20000180 83a93900 df00: 00000003 84649900 dfb5dfa4 dfb5df18 805a1b3c 814513b0 ecac8b10 84649900 df20: dfb5df3c dfb5df30 81b171b4 81b17080 dfb5df54 dfb5df40 8025a6bc 8028e2a4 df40: dfb5dfb0 40000000 dfb5df84 dfb5df58 80220be0 8025a678 00000000 82a1c63c df60: dfb5dfb0 0013e9b0 ecac8b10 80220b34 00000000 aff15fbf dfb5dfac 00000000 df80: 00000000 00346310 00000036 8020029c 84649900 00000036 00000000 dfb5dfa8 dfa0: 80200060 805a1904 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f240dc dfe0: 76f23e88 76f23e78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<81458ee0>] (parport_attach) from [<81454bc8>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27b68 r4:82bd2abc [<81454ac0>] (comedi_device_attach) from [<814503d4>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:84649900 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:846a99c0 r4:20000180 [<81450300>] (do_devconfig_ioctl) from [<814516f8>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:846a99c0 r4:83a93900 [<814513a4>] (comedi_unlocked_ioctl) from [<805a1b3c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814513a4>] (comedi_unlocked_ioctl) from [<805a1b3c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814513a4>] (comedi_unlocked_ioctl) from [<805a1b3c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814513a4>] (comedi_unlocked_ioctl) from [<805a1b3c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84649900 r9:00000003 r8:83a93900 r7:20000180 r6:40946400 r5:83a93901 r4:00000000 [<805a18f8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb5dfa8 to 0xdfb5dff0) dfa0: 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f240dc dfe0: 76f23e88 76f23e78 00018ebc 00130810 r10:00000036 r9:84649900 r8:8020029c r7:00000036 r6:00346310 r5:00000000 r4:00000000 Code: e5963064 e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e5963064 ldr r3, [r6, #100] @ 0x64 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