8<--- cut here --- Unable to handle kernel paging request at virtual address fee00004 when write [fee00004] *pgd=80000080007003 , *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 26475 Comm: syz.4.5322 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 : [<81494ec0>] lr : [<81494eb4>] psr: 60000013 sp : ea6add30 ip : ea6add30 fp : ea6add54 r10: 82d30dfc r9 : 00000003 r8 : 831d0240 r7 : ea6add90 r6 : ea6add90 r5 : 831d0240 r4 : 00000000 r3 : fee00004 r2 : 00000000 r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85bd3340 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 831d0240 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xea6ac000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r7 information: 2-page vmalloc region starting at 0xea6ac000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 831d0240 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 0xea6ac000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xea6ac000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.4.5322 (pid: 26475, stack limit = 0xea6ac000) Stack: (0xea6add30 to 0xea6ae000) dd20: ffffffff 00000004 82bd8ea0 81e2e428 dd40: 00000000 ea6add90 ea6add8c ea6add58 81490b50 81494e70 40946400 00000000 dd60: ea6add7c 200000c0 831d0240 b5403587 40946400 00000003 00000003 8557d5c0 dd80: ea6ade4c ea6add90 8148c354 81490a54 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00000004 00000007 00000004 00001000 00000008 00000005 00000079 ddc0: 00000003 0008000a fffffffe ffffffff 00000004 00000002 00000004 00000100 dde0: 00000009 fffffffb 00000010 00000013 00001000 00000089 00000003 fffffffe de00: 20001e58 00000003 0000f39e 00000003 00000008 0000000a 00000000 fffffff8 de20: 00000000 3c387197 00000000 867fed80 831d0240 200000c0 40946400 00000003 de40: ea6adf14 ea6ade50 8148d67c 8148c294 00000000 3c387197 00000000 00000000 de60: 82549844 ea6adea4 0000005f 84150f18 00000064 831d0270 ea6adee4 ea6ade88 de80: 8080664c 807fcd04 00000064 00000001 00000000 ea6adea4 85a08410 835b8cc0 dea0: 00006400 0000000b ea6ade98 00000000 00000000 3c387197 00000000 867fed80 dec0: 40946400 200000c0 200000c0 867fed80 00000003 8557d5c0 ea6adef4 ea6adee8 dee0: 80806780 3c387197 ea6adf14 00000000 867fed81 40946400 200000c0 867fed80 df00: 00000003 8557d5c0 ea6adfa4 ea6adf18 805bb0cc 8148d334 ecac8b10 8557d5c0 df20: ea6adf3c ea6adf30 81b5b1a0 81b5b06c ea6adf54 ea6adf40 8025a7a8 8028e490 df40: ea6adfb0 40000000 ea6adf84 ea6adf58 80220bdc 8025a764 00000000 82a1eb0c df60: ea6adfb0 0013eae0 ecac8b10 80220b30 00000000 3c387197 ea6adfac 00000000 df80: 00000000 00356310 00000036 8020029c 8557d5c0 00000036 00000000 ea6adfa8 dfa0: 80200060 805bae94 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f410dc dfe0: 76f40e88 76f40e78 00018ee8 00130940 60000010 00000003 00000000 00000000 Call trace: [<81494e64>] (parport_attach) from [<81490b50>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:ea6add90 r6:00000000 r5:81e2e428 r4:82bd8ea0 [<81490a48>] (comedi_device_attach) from [<8148c354>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:8557d5c0 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:831d0240 r4:200000c0 [<8148c288>] (do_devconfig_ioctl) from [<8148d67c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:200000c0 r5:831d0240 r4:867fed80 [<8148d328>] (comedi_unlocked_ioctl) from [<805bb0cc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148d328>] (comedi_unlocked_ioctl) from [<805bb0cc>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148d328>] (comedi_unlocked_ioctl) from [<805bb0cc>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148d328>] (comedi_unlocked_ioctl) from [<805bb0cc>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8557d5c0 r9:00000003 r8:867fed80 r7:200000c0 r6:40946400 r5:867fed81 r4:00000000 [<805bae88>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea6adfa8 to 0xea6adff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f410dc dfe0: 76f40e88 76f40e78 00018ee8 00130940 r10:00000036 r9:8557d5c0 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb67f58 e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb67f58 bl 0xfed9fd68 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