8<--- cut here --- Unable to handle kernel paging request at virtual address fee08001 when write [fee08001] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 10787 Comm: syz.3.1413 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 : [<813ce6a8>] lr : [<813ce698>] psr: 60000013 sp : df941d30 ip : df941d30 fp : df941d54 r10: 82b25910 r9 : 00000003 r8 : 8411cb40 r7 : df941d90 r6 : 8411cb40 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e177dc r1 : 00000001 r0 : 813ce318 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8429a800 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 8411cb40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf940000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 8411cb40 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 0xdf940000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdf940000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.3.1413 (pid: 10787, stack limit = 0xdf940000) Stack: (0xdf941d30 to 0xdf942000) 1d20: 823f13b8 8411cb40 829d1bf4 829d1bf4 1d40: 81e17c9c 8411cb84 df941d8c df941d58 813ca738 813ce540 200000c0 00000000 1d60: df941d7c 200000c0 8411cb40 b5403587 200000c0 85b26c00 40946400 00000003 1d80: df941e4c df941d90 813c6284 813ca63c 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00008001 ffffff01 00000001 00000000 00000002 00000cc7 00000008 1dc0: 00000007 0000000a 00000100 00000002 00000001 00000008 01100004 00000006 1de0: 00000009 00000001 0001a449 00000003 40000003 00000089 00000002 00000f27 1e00: 00000006 0000800b 00000008 00000005 00000008 00000008 00010000 fffffff7 1e20: 00000000 dc6082ce 00000000 833d5300 8411cb40 200000c0 200000c0 85b26c00 1e40: df941f14 df941e50 813c7250 813c6190 00000000 00000000 00000000 dc6082ce 1e60: 00000000 00000000 824625b4 0000005f 83d06e20 8411cb70 8414a714 85b26c00 1e80: df941ee4 df941e90 807a7684 8079da7c 00000064 00000001 00000000 df941eac 1ea0: 84a30b50 834e5770 00006400 0000000b df941ea0 00000000 00000000 dc6082ce 1ec0: 833d5300 40946400 200000c0 200000c0 833d5300 00000003 df941ef4 df941ee8 1ee0: 807a77a4 dc6082ce df941f14 40946400 00000000 833d5301 200000c0 833d5300 1f00: 00000003 85b26c00 df941fa4 df941f18 805788b8 813c6c80 ecac8b10 85b26c00 1f20: df941f3c df941f30 81a60ad8 81a609a8 df941f54 df941f40 8025c484 8028d914 1f40: df941fb0 40000000 df941f84 df941f58 802229ec 8025c440 00000000 8281cfb4 1f60: df941fb0 0014ced0 ecac8b10 80222940 00000000 dc6082ce df941fac 00000000 1f80: 00000000 00316308 00000036 8020029c 85b26c00 00000036 00000000 df941fa8 1fa0: 80200060 80578794 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fcc0bc 1fe0: 76fcbec0 76fcbeb0 0001928c 00132970 60000010 00000003 00000000 00000000 Call trace: [<813ce534>] (parport_attach) from [<813ca738>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:8411cb84 r5:81e17c9c r4:829d1bf4 [<813ca630>] (comedi_device_attach) from [<813c6284>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85b26c00 r7:200000c0 r6:b5403587 r5:8411cb40 r4:200000c0 [<813c6184>] (do_devconfig_ioctl) from [<813c7250>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:85b26c00 r7:200000c0 r6:200000c0 r5:8411cb40 r4:833d5300 [<813c6c74>] (comedi_unlocked_ioctl) from [<805788b8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6c74>] (comedi_unlocked_ioctl) from [<805788b8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6c74>] (comedi_unlocked_ioctl) from [<805788b8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6c74>] (comedi_unlocked_ioctl) from [<805788b8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85b26c00 r9:00000003 r8:833d5300 r7:200000c0 r6:833d5301 r5:00000000 r4:40946400 [<80578788>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf941fa8 to 0xdf941ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fcc0bc 1fe0: 76fcbec0 76fcbeb0 0001928c 00132970 r10:00000036 r9:85b26c00 r8:8020029c r7:00000036 r6:00316308 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