8<--- cut here --- Unable to handle kernel paging request at virtual address fee01610 when write [fee01610] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 14981 Comm: syz.5.1645 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 : [<813ced10>] lr : [<813ced00>] psr: 60000013 sp : eab35d30 ip : eab35d30 fp : eab35d54 r10: 82b25910 r9 : 00000003 r8 : 84296180 r7 : eab35d90 r6 : 84296180 r5 : 00000000 r4 : 00000000 r3 : fee01610 r2 : 81e1777c r1 : 00000001 r0 : 813ce980 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86fa0000 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 84296180 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xeab34000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 84296180 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 0xeab34000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xeab34000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.5.1645 (pid: 14981, stack limit = 0xeab34000) Stack: (0xeab35d30 to 0xeab36000) 5d20: 823f1604 84296180 829d1c34 829d1c34 5d40: 81e17c3c 842961c4 eab35d8c eab35d58 813cad9c 813ceba8 200000c0 00000000 5d60: eab35d7c 200000c0 84296180 b5403587 200000c0 83adc800 40946400 00000003 5d80: eab35e4c eab35d90 813c68e8 813caca0 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00001610 00001216 00000001 00000000 00000003 00000cc7 00000009 5dc0: 00000aab 0000000a 00000100 00000002 00000001 00000008 01100004 00000006 5de0: 00000009 00000001 0001a449 00000003 40000003 00000089 00000002 00000f27 5e00: 00000006 0000800b 00000ca8 00000005 00000004 00000400 00010000 fffffff7 5e20: 00000000 c8dd5aa2 00000000 85f0ecc0 84296180 200000c0 200000c0 83adc800 5e40: eab35f14 eab35e50 813c78b4 813c67f4 00000000 00000000 00000000 c8dd5aa2 5e60: 00000000 00000000 824625b4 0000005f 83cd6e20 842961b0 84279a74 83adc800 5e80: eab35ee4 eab35e90 807a7d9c 8079e194 00000064 00000001 00000000 eab35eac 5ea0: 85fddf10 83433198 00006400 0000000b eab35ea0 00000000 00000000 c8dd5aa2 5ec0: 85f0ecc0 40946400 200000c0 200000c0 85f0ecc0 00000003 eab35ef4 eab35ee8 5ee0: 807a7ebc c8dd5aa2 eab35f14 40946400 00000000 85f0ecc1 200000c0 85f0ecc0 5f00: 00000003 83adc800 eab35fa4 eab35f18 80578f00 813c72e4 ecac8b10 83adc800 5f20: eab35f3c eab35f30 81a61720 81a615f0 eab35f54 eab35f40 8025c484 8028d914 5f40: eab35fb0 40000000 eab35f84 eab35f58 802229ec 8025c440 00000000 8281cfb4 5f60: eab35fb0 0014ced0 ecac8b10 80222940 00000000 c8dd5aa2 eab35fac 00000000 5f80: 00000000 00316308 00000036 8020029c 83adc800 00000036 00000000 eab35fa8 5fa0: 80200060 80578ddc 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fbe0bc 5fe0: 76fbdec0 76fbdeb0 00019294 00132970 60000010 00000003 00000000 00000000 Call trace: [<813ceb9c>] (parport_attach) from [<813cad9c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:842961c4 r5:81e17c3c r4:829d1c34 [<813cac94>] (comedi_device_attach) from [<813c68e8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83adc800 r7:200000c0 r6:b5403587 r5:84296180 r4:200000c0 [<813c67e8>] (do_devconfig_ioctl) from [<813c78b4>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83adc800 r7:200000c0 r6:200000c0 r5:84296180 r4:85f0ecc0 [<813c72d8>] (comedi_unlocked_ioctl) from [<80578f00>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c72d8>] (comedi_unlocked_ioctl) from [<80578f00>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c72d8>] (comedi_unlocked_ioctl) from [<80578f00>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c72d8>] (comedi_unlocked_ioctl) from [<80578f00>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83adc800 r9:00000003 r8:85f0ecc0 r7:200000c0 r6:85f0ecc1 r5:00000000 r4:40946400 [<80578dd0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xeab35fa8 to 0xeab35ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fbe0bc 5fe0: 76fbdec0 76fbdeb0 00019294 00132970 r10:00000036 r9:83adc800 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