Unable to handle kernel paging request at virtual address fee00140 when write [fee00140] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6032 Comm: syz.8.9025 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 : [<81495128>] lr : [<8149511c>] psr: 60000013 sp : df92dd30 ip : df92dd30 fp : df92dd54 r10: 82d30dfc r9 : 00000003 r8 : 8311b000 r7 : df92dd90 r6 : df92dd90 r5 : 8311b000 r4 : 00000000 r3 : fee00140 r2 : 00000000 r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86a14340 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 8311b000 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xdf92c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r7 information: 2-page vmalloc region starting at 0xdf92c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 8311b000 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 0xdf92c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdf92c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.8.9025 (pid: 6032, stack limit = 0xdf92c000) Stack: (0xdf92dd30 to 0xdf92e000) dd20: ffffffff 00000004 82bd8ea0 81e2e448 dd40: 00000000 df92dd90 df92dd8c df92dd58 81490db4 814950d8 40946400 00000000 dd60: df92dd7c 200003c0 8311b000 b5403587 40946400 00000002 00000003 83fbee40 dd80: df92de4c df92dd90 8148c5b8 81490cb8 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00000140 fffffffc 0001000c 0002dddc 00000000 00010000 00007fff ddc0: 00000006 00000007 0000c72c 02000004 0000000f 0000c000 00000008 000004ce dde0: 00008e99 00000001 000000ed 00000006 00000008 00000004 00000000 0000000a de00: 00000009 00000ffd 00000009 000000af 00000002 00000283 00008001 0000e43f de20: 00000000 0fdf891c 00000000 86614300 8311b000 200003c0 40946400 00000002 de40: df92df14 df92de50 8148d8e0 8148c4f8 df92de4c 0fdf891c 00000000 00000000 de60: 8254a844 df92dea4 0000005f 84290990 00000064 8311b030 df92dee4 df92de88 de80: 808065fc 807fccb4 00000064 00000001 00000000 df92dea4 8553ba10 83434770 dea0: 00006400 0000000b df92de98 00000000 df92dd38 0fdf891c 00000000 86614300 dec0: 40946400 200003c0 200003c0 86614300 00000003 83fbee40 df92def4 df92dee8 dee0: 80806730 0fdf891c df92df14 00000000 86614301 40946400 200003c0 86614300 df00: 00000003 83fbee40 df92dfa4 df92df18 805bb114 8148d598 ecac8b10 83fbee40 df20: df92df3c df92df30 81b5c4e0 81b5c3ac df92df54 df92df40 8025a7a8 8028e490 df40: df92dfb0 40000000 df92df84 df92df58 80220bdc 8025a764 00000000 82a1eb0c df60: df92dfb0 0013eb80 ecac8b10 80220b30 00000000 0fdf891c df92dfac 00000000 df80: 00000000 00356310 00000036 8020029c 83fbee40 00000036 00000000 df92dfa8 dfa0: 80200060 805baedc 00000000 00000000 00000003 40946400 200003c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fdd0dc dfe0: 76fdce88 76fdce78 00018f80 001309e0 60000010 00000003 00000000 00000000 Call trace: [<814950cc>] (parport_attach) from [<81490db4>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:df92dd90 r6:00000000 r5:81e2e448 r4:82bd8ea0 [<81490cac>] (comedi_device_attach) from [<8148c5b8>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:83fbee40 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:8311b000 r4:200003c0 [<8148c4ec>] (do_devconfig_ioctl) from [<8148d8e0>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:8311b000 r4:86614300 [<8148d58c>] (comedi_unlocked_ioctl) from [<805bb114>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148d58c>] (comedi_unlocked_ioctl) from [<805bb114>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148d58c>] (comedi_unlocked_ioctl) from [<805bb114>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148d58c>] (comedi_unlocked_ioctl) from [<805bb114>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83fbee40 r9:00000003 r8:86614300 r7:200003c0 r6:40946400 r5:86614301 r4:00000000 [<805baed0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf92dfa8 to 0xdf92dff0) dfa0: 00000000 00000000 00000003 40946400 200003c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fdd0dc dfe0: 76fdce88 76fdce78 00018f80 001309e0 r10:00000036 r9:83fbee40 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb67ebe e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb67ebe bl 0xfed9fb00 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