8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 28340 Comm: syz.0.6152 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 : [<813ab660>] lr : [<813ab650>] psr: 60000013 sp : dfc69d30 ip : dfc69d30 fp : dfc69d54 r10: 82b16f00 r9 : 00000003 r8 : 83d433c0 r7 : dfc69d90 r6 : 83d433c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15364 r1 : 00000001 r0 : 813ab2d0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 860ac600 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 83d433c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfc68000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 83d433c0 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 0xdfc68000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfc68000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.0.6152 (pid: 28340, stack limit = 0xdfc68000) Stack: (0xdfc69d30 to 0xdfc6a000) 9d20: 823fe2b4 83d433c0 829cf92c 829cf92c 9d40: 81e15824 83d43404 dfc69d8c dfc69d58 813a76f8 813ab4f8 20000200 00000000 9d60: dfc69d7c 20000200 83d433c0 b5403587 20000200 86006000 40946400 00000003 9d80: dfc69e4c dfc69d90 813a3278 813a75fc 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004f27 00000005 00000002 00000006 00000002 00000cc7 00000fff 9dc0: 00000007 00000005 000003ff 0000007f 00001600 5d3902be 00000003 00000009 9de0: 0000042c 00000005 00000004 00000031 00000395 80000089 fffffffd 00000007 9e00: 00001007 ffffeadb 00000003 0001003c 00000005 00000004 08000000 00000005 9e20: 00000000 cba4b651 00000000 85939240 83d433c0 20000200 20000200 86006000 9e40: dfc69f14 dfc69e50 813a4244 813a3184 00000000 00000000 00000000 cba4b651 9e60: 00000000 00000000 8247054c 0000005f 84276858 83d433f0 8424700c 86006000 9e80: dfc69ee4 dfc69e90 807979b4 8078dd18 00000064 00000001 00000000 dfc69eac 9ea0: 8493db50 8341edd0 00006400 0000000b dfc69ea0 00000000 00000000 cba4b651 9ec0: 85939240 40946400 20000200 20000200 85939240 00000003 dfc69ef4 dfc69ee8 9ee0: 80797ad4 cba4b651 dfc69f14 40946400 00000000 85939241 20000200 85939240 9f00: 00000003 86006000 dfc69fa4 dfc69f18 8056cd60 813a3c74 ecac8b10 86006000 9f20: dfc69f3c dfc69f30 81a394b8 81a39388 dfc69f54 dfc69f40 8025e490 8028ef64 9f40: dfc69fb0 40000000 dfc69f84 dfc69f58 802229ec 8025e44c 00000000 8281cddc 9f60: dfc69fb0 0014c820 ecac8b10 80222940 00000000 cba4b651 dfc69fac 00000000 9f80: 00000000 002f6308 00000036 8020029c 86006000 00000036 00000000 dfc69fa8 9fa0: 80200060 8056cc3c 00000000 00000000 00000003 40946400 20000200 00000000 9fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f640bc 9fe0: 76f63ec0 76f63eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813ab4ec>] (parport_attach) from [<813a76f8>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:83d43404 r5:81e15824 r4:829cf92c [<813a75f0>] (comedi_device_attach) from [<813a3278>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:86006000 r7:20000200 r6:b5403587 r5:83d433c0 r4:20000200 [<813a3178>] (do_devconfig_ioctl) from [<813a4244>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:86006000 r7:20000200 r6:20000200 r5:83d433c0 r4:85939240 [<813a3c68>] (comedi_unlocked_ioctl) from [<8056cd60>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3c68>] (comedi_unlocked_ioctl) from [<8056cd60>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3c68>] (comedi_unlocked_ioctl) from [<8056cd60>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3c68>] (comedi_unlocked_ioctl) from [<8056cd60>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:86006000 r9:00000003 r8:85939240 r7:20000200 r6:85939241 r5:00000000 r4:40946400 [<8056cc30>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc69fa8 to 0xdfc69ff0) 9fa0: 00000000 00000000 00000003 40946400 20000200 00000000 9fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f640bc 9fe0: 76f63ec0 76f63eb0 0001948c 001322c0 r10:00000036 r9:86006000 r8:8020029c r7:00000036 r6:002f6308 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