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: 0 UID: 0 PID: 26527 Comm: syz.9.3751 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 : [<813ab950>] lr : [<813ab940>] psr: 60000013 sp : dfc31d30 ip : dfc31d30 fp : dfc31d54 r10: 82b16f40 r9 : 00000003 r8 : 840e19c0 r7 : dfc31d90 r6 : 840e19c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e153a4 r1 : 00000001 r0 : 813ab5c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 854e4600 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 840e19c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfc30000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 840e19c0 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 0xdfc30000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfc30000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.9.3751 (pid: 26527, stack limit = 0xdfc30000) Stack: (0xdfc31d30 to 0xdfc32000) 1d20: 823fe498 840e19c0 829cf96c 829cf96c 1d40: 81e15864 840e1a04 dfc31d8c dfc31d58 813a79e8 813ab7e8 200000c0 00000000 1d60: dfc31d7c 200000c0 840e19c0 b5403587 200000c0 84e3ec00 40946400 00000003 1d80: dfc31e4c dfc31d90 813a3568 813a78ec 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00004f27 00000002 00000004 00000004 00000005 00000005 00000004 1dc0: 00000007 54c6cff3 000000fd 00000002 00000001 00000001 00000001 00000006 1de0: 0000006a 00000000 0000007f 00000003 40000003 00000089 0000caa3 00000000 1e00: 20001e5b 00009dc6 02000e66 00000003 00000008 00004086 00000000 fffffffc 1e20: 00000000 e39be250 00000000 85e589c0 840e19c0 200000c0 200000c0 84e3ec00 1e40: dfc31f14 dfc31e50 813a4534 813a3474 00000000 00000000 00000000 e39be250 1e60: 00000000 00000000 8247054c 0000005f 83da3458 840e19f0 8419c09c 84e3ec00 1e80: dfc31ee4 dfc31e90 80797a24 8078dd88 00000064 00000001 00000000 dfc31eac 1ea0: 85627610 8342f880 00006400 0000000b dfc31ea0 00000000 00000000 e39be250 1ec0: 85e589c0 40946400 200000c0 200000c0 85e589c0 00000003 dfc31ef4 dfc31ee8 1ee0: 80797b44 e39be250 dfc31f14 40946400 00000000 85e589c1 200000c0 85e589c0 1f00: 00000003 84e3ec00 dfc31fa4 dfc31f18 8056cd68 813a3f64 ecac8b10 84e3ec00 1f20: dfc31f3c dfc31f30 81a39a78 81a39948 dfc31f54 dfc31f40 8025e490 8028ef64 1f40: dfc31fb0 40000000 dfc31f84 dfc31f58 802229ec 8025e44c 00000000 8281cddc 1f60: dfc31fb0 0014c820 ecac8b10 80222940 00000000 e39be250 dfc31fac 00000000 1f80: 00000000 002f6308 00000036 8020029c 84e3ec00 00000036 00000000 dfc31fa8 1fa0: 80200060 8056cc44 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fe60bc 1fe0: 76fe5ec0 76fe5eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813ab7dc>] (parport_attach) from [<813a79e8>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:840e1a04 r5:81e15864 r4:829cf96c [<813a78e0>] (comedi_device_attach) from [<813a3568>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:84e3ec00 r7:200000c0 r6:b5403587 r5:840e19c0 r4:200000c0 [<813a3468>] (do_devconfig_ioctl) from [<813a4534>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:84e3ec00 r7:200000c0 r6:200000c0 r5:840e19c0 r4:85e589c0 [<813a3f58>] (comedi_unlocked_ioctl) from [<8056cd68>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3f58>] (comedi_unlocked_ioctl) from [<8056cd68>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3f58>] (comedi_unlocked_ioctl) from [<8056cd68>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3f58>] (comedi_unlocked_ioctl) from [<8056cd68>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:84e3ec00 r9:00000003 r8:85e589c0 r7:200000c0 r6:85e589c1 r5:00000000 r4:40946400 [<8056cc38>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc31fa8 to 0xdfc31ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fe60bc 1fe0: 76fe5ec0 76fe5eb0 0001948c 001322c0 r10:00000036 r9:84e3ec00 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