8<--- cut here --- 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: 0 UID: 0 PID: 30379 Comm: syz.0.2470 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: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 : [<814092a8>] lr : [<81409298>] psr: 60000013 sp : ebd29d28 ip : ebd29d28 fp : ebd29d4c r10: 82b28ad8 r9 : 00000003 r8 : 84520540 r7 : ebd29d88 r6 : 84520540 r5 : 00000000 r4 : 00000000 r3 : fee00003 r2 : 81e1a318 r1 : 00000001 r0 : 81408f18 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85be8bc0 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:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 84520540 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xebd28000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 84520540 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 0xebd28000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xebd28000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.0.2470 (pid: 30379, stack limit = 0xebd28000) Stack: (0xebd29d28 to 0xebd2a000) 9d20: 82433190 84520540 829d3f08 829d3f08 81e1a7d8 84520584 9d40: ebd29d84 ebd29d50 81404f54 81409140 84520570 00000000 ebd29d74 200000c0 9d60: 84520540 b5403587 84520570 852cbc00 40946400 00000003 ebd29e44 ebd29d88 9d80: 814008ac 81404e58 656d6f63 705f6964 6f707261 00007472 00000000 00000003 9da0: 00001216 00000001 00000000 00000003 00000cc7 00000009 00000aab 0000000a 9dc0: 00000100 00000002 00000001 00000004 01100004 00000006 00000009 00000001 9de0: 0001a449 00000006 40000003 00000089 00000002 00000f27 02000006 0000800b 9e00: 00000ca8 00000005 00000004 00000000 00010000 fffffff7 00000000 d8e11b59 9e20: 00000000 85ed1840 84520540 200000c0 84520570 852cbc00 ebd29f14 ebd29e48 9e40: 814018a0 814007b8 00000000 00000000 00000000 ebd29e54 ebd29e54 d8e11b59 9e60: 00000000 00000000 824a45ec 0000005f 840bd9f0 00000064 84409cb4 852cbc00 9e80: ebd29ee4 ebd29e90 807b8180 807ae6a4 00000064 00000001 00000000 ebd29eac 9ea0: 85d56b50 834dc4c8 00006400 0000000b ebd29ea0 00000000 ebd29d40 d8e11b59 9ec0: 85ed1840 40946400 200000c0 200000c0 85ed1840 00000003 ebd29ef4 ebd29ee8 9ee0: 807b82a0 d8e11b59 ebd29f14 40946400 00000000 85ed1841 200000c0 85ed1840 9f00: 00000003 852cbc00 ebd29fa4 ebd29f18 80585768 814012f0 ecac8b10 852cbc00 9f20: ebd29f3c ebd29f30 81ab004c 81aaff1c ebd29f54 ebd29f40 8025bcbc 8028e0c4 9f40: ebd29fb0 40000000 ebd29f84 ebd29f58 80221a38 8025bc78 00000000 8281d17c 9f60: ebd29fb0 0014c8c0 ecac8b10 8022198c 00000000 d8e11b59 ebd29fac 00000000 9f80: 00000000 00326310 00000036 8020029c 852cbc00 00000036 00000000 ebd29fa8 9fa0: 80200060 80585644 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f1d0bc 9fe0: 76f1cec0 76f1ceb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<81409134>] (parport_attach) from [<81404f54>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:84520584 r5:81e1a7d8 r4:829d3f08 [<81404e4c>] (comedi_device_attach) from [<814008ac>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:852cbc00 r7:84520570 r6:b5403587 r5:84520540 r4:200000c0 [<814007ac>] (do_devconfig_ioctl) from [<814018a0>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:852cbc00 r7:84520570 r6:200000c0 r5:84520540 r4:85ed1840 [<814012e4>] (comedi_unlocked_ioctl) from [<80585768>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814012e4>] (comedi_unlocked_ioctl) from [<80585768>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814012e4>] (comedi_unlocked_ioctl) from [<80585768>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814012e4>] (comedi_unlocked_ioctl) from [<80585768>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:852cbc00 r9:00000003 r8:85ed1840 r7:200000c0 r6:85ed1841 r5:00000000 r4:40946400 [<80585638>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xebd29fa8 to 0xebd29ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f1d0bc 9fe0: 76f1cec0 76f1ceb0 000192bc 00132360 r10:00000036 r9:852cbc00 r8:8020029c r7:00000036 r6:00326310 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