8<--- cut here --- Unable to handle kernel paging request at virtual address fee009e0 when write [fee009e0] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 5997 Comm: syz.0.491 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 : [<81435bdc>] lr : [<81435bcc>] psr: 60000013 sp : dfb99d30 ip : dfb99d30 fp : dfb99d54 r10: 82b2f0bc r9 : 00000003 r8 : 833806c0 r7 : dfb99d90 r6 : 833806c0 r5 : 00000000 r4 : 00000000 r3 : fee009e0 r2 : 81e24db8 r1 : 00000001 r0 : 8143584c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86080080 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 833806c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb98000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r8 information: slab kmalloc-192 start 833806c0 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 0xdfb98000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r12 information: 2-page vmalloc region starting at 0xdfb98000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Process syz.0.491 (pid: 5997, stack limit = 0xdfb98000) Stack: (0xdfb99d30 to 0xdfb9a000) 9d20: 824456a4 833806c0 829d6b9c 829d6b9c 9d40: 81e25278 00000000 dfb99d8c dfb99d58 81431754 81435a74 40946400 00000000 9d60: dfb99d7c 20000140 833806c0 b5403587 40946400 00000002 00000003 85120c40 9d80: dfb99e4c dfb99d90 8142cf60 81431654 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 000009e0 fffffeff f7f7fffe fffffffe 00000008 00000000 00000000 9dc0: 00000010 00001002 ffffffff 00000001 00000005 00000344 00000002 00000007 9de0: 00000002 00000008 00000003 00000009 00000010 00000100 00001003 00000007 9e00: 0008000a 00000005 00000001 0000b0c4 000007d8 00000009 00400007 00000001 9e20: 00000000 81d14630 85120c40 8619ca80 833806c0 20000140 40946400 00000002 9e40: dfb99f14 dfb99e50 8142e284 8142ce98 00000000 81d14630 00000000 00000000 9e60: 824b957c dfb99ea4 0000005f 844a8a30 00000064 833806f0 dfb99ee4 dfb99e88 9e80: 807d08f8 807c6cd0 00000064 00000001 00000000 dfb99ea4 830e3190 834dfa18 9ea0: 00006400 0000000b dfb99e98 00000000 00000000 81d14630 00000000 8619ca80 9ec0: 40946400 20000140 20000140 8619ca80 00000003 85120c40 dfb99ef4 dfb99ee8 9ee0: 807d0a28 81d14630 dfb99f14 00000000 8619ca81 40946400 20000140 8619ca80 9f00: 00000003 85120c40 dfb99fa4 dfb99f18 805912b0 8142df3c ecac8b10 85120c40 9f20: dfb99f3c dfb99f30 81ae7bb4 81ae7a80 dfb99f54 dfb99f40 8025a894 8028c408 9f40: dfb99fb0 40000000 dfb99f84 dfb99f58 80220bf8 8025a850 00000000 8281d2fc 9f60: dfb99fb0 0013e4a0 ecac8b10 80220b4c 00000000 81d14630 dfb99fac 00000000 9f80: 00000000 00346310 00000036 8020029c 85120c40 00000036 00000000 dfb99fa8 9fa0: 80200060 80591078 00000000 00000000 00000003 40946400 20000140 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f900dc 9fe0: 76f8fe88 76f8fe78 00018bc4 00130300 60000010 00000003 00000000 00000000 Call trace: [<81435a68>] (parport_attach) from [<81431754>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e25278 r4:829d6b9c [<81431648>] (comedi_device_attach) from [<8142cf60>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:85120c40 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:833806c0 r4:20000140 [<8142ce8c>] (do_devconfig_ioctl) from [<8142e284>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000002 r7:40946400 r6:20000140 r5:833806c0 r4:8619ca80 [<8142df30>] (comedi_unlocked_ioctl) from [<805912b0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142df30>] (comedi_unlocked_ioctl) from [<805912b0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142df30>] (comedi_unlocked_ioctl) from [<805912b0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142df30>] (comedi_unlocked_ioctl) from [<805912b0>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:85120c40 r9:00000003 r8:8619ca80 r7:20000140 r6:40946400 r5:8619ca81 r4:00000000 [<8059106c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb99fa8 to 0xdfb99ff0) 9fa0: 00000000 00000000 00000003 40946400 20000140 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f900dc 9fe0: 76f8fe88 76f8fe78 00018bc4 00130300 r10:00000036 r9:85120c40 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