Unable to handle kernel paging request at virtual address fee00003 when write [fee00003] *pgd=80000080007003 , *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 13897 Comm: syz.4.2316 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:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<81434514>] lr : [<81434504>] psr: 60000013 sp : eaa95d30 ip : eaa95d30 fp : eaa95d54 r10: 82b2f06c r9 : 00000003 r8 : 833800c0 r7 : eaa95d90 r6 : 833800c0 r5 : 00000000 r4 : 00000000 r3 : fee00003 r2 : 81e24b58 r1 : 00000001 r0 : 81434184 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86624ac0 DAC: 00000000 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:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 833800c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xeaa94000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r8 information: slab kmalloc-192 start 833800c0 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 0xeaa94000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r12 information: 2-page vmalloc region starting at 0xeaa94000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Process syz.4.2316 (pid: 13897, stack limit = 0xeaa94000) Stack: (0xeaa95d30 to 0xeaa96000) 5d20: 82444e48 833800c0 829d675c 829d675c 5d40: 81e25018 00000000 eaa95d8c eaa95d58 8143008c 814343ac 40946400 00000000 5d60: eaa95d7c 20000140 833800c0 b5403587 40946400 00000000 00000003 8477d5c0 5d80: eaa95e4c eaa95d90 8142b898 8142ff8c 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000003 00000002 7fffffff 000084e1 0000002f 00002006 00000006 5dc0: 00000008 00080ffa 00000000 00000000 00008500 00001003 01000004 0000000f 5de0: 00010000 ffffffa8 7ffbfffd 000001ff 000009ea 00000010 00040000 00000008 5e00: 00000005 0000746f 00000008 00000005 00000008 00000004 00000000 00007ffd 5e20: 00000000 e3d50ec7 00000000 8c858e40 833800c0 20000140 40946400 00000000 5e40: eaa95f14 eaa95e50 8142cbbc 8142b7d0 eaa95e4c e3d50ec7 00000000 00000000 5e60: 824b957c eaa95ea4 0000005f 842bdbe8 00000064 833800f0 eaa95ee4 eaa95e88 5e80: 807cf7f8 807c5bd0 00000064 00000001 00000000 eaa95ea4 85efad90 834e9088 5ea0: 00006400 0000000b eaa95e98 00000000 eaa95d38 e3d50ec7 00000000 8c858e40 5ec0: 40946400 20000140 20000140 8c858e40 00000003 8477d5c0 eaa95ef4 eaa95ee8 5ee0: 807cf928 e3d50ec7 eaa95f14 00000000 8c858e41 40946400 20000140 8c858e40 5f00: 00000003 8477d5c0 eaa95fa4 eaa95f18 80590c2c 8142c874 ecac8b10 8477d5c0 5f20: eaa95f3c eaa95f30 81ae5bb4 81ae5a80 eaa95f54 eaa95f40 8025a87c 8028c380 5f40: eaa95fb0 40000000 eaa95f84 eaa95f58 80220bf8 8025a838 00000000 8281d2fc 5f60: eaa95fb0 0013e480 ecac8b10 80220b4c 00000000 e3d50ec7 eaa95fac 00000000 5f80: 00000000 00346310 00000036 8020029c 8477d5c0 00000036 00000000 eaa95fa8 5fa0: 80200060 805909f4 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f080dc 5fe0: 76f07e88 76f07e78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<814343a0>] (parport_attach) from [<8143008c>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e25018 r4:829d675c [<8142ff80>] (comedi_device_attach) from [<8142b898>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:8477d5c0 r9:00000003 r8:00000000 r7:40946400 r6:b5403587 r5:833800c0 r4:20000140 [<8142b7c4>] (do_devconfig_ioctl) from [<8142cbbc>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000000 r7:40946400 r6:20000140 r5:833800c0 r4:8c858e40 [<8142c868>] (comedi_unlocked_ioctl) from [<80590c2c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142c868>] (comedi_unlocked_ioctl) from [<80590c2c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142c868>] (comedi_unlocked_ioctl) from [<80590c2c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142c868>] (comedi_unlocked_ioctl) from [<80590c2c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8477d5c0 r9:00000003 r8:8c858e40 r7:20000140 r6:40946400 r5:8c858e41 r4:00000000 [<805909e8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xeaa95fa8 to 0xeaa95ff0) 5fa0: 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f080dc 5fe0: 76f07e88 76f07e78 00018ba0 001302e0 r10:00000036 r9:8477d5c0 r8:8020029c r7:00000036 r6:00346310 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 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