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: 6930 Comm: syz.1.739 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 : [<813ce490>] lr : [<813ce480>] psr: 60000013 sp : dfb69d30 ip : dfb69d30 fp : dfb69d54 r10: 82b25910 r9 : 00000003 r8 : 83d0da80 r7 : dfb69d90 r6 : 83d0da80 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1773c r1 : 00000001 r0 : 813ce100 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84bb57c0 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 83d0da80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb68000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 83d0da80 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 0xdfb68000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfb68000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.1.739 (pid: 6930, stack limit = 0xdfb68000) Stack: (0xdfb69d30 to 0xdfb6a000) 9d20: 823f12b8 83d0da80 dfb69d58 829d1bf4 9d40: 81e17bfc 83d0dac4 dfb69d8c dfb69d58 813ca520 813ce328 200000c0 00000000 9d60: dfb69d7c 200000c0 83d0da80 b5403587 200000c0 841a4800 40946400 00000003 9d80: dfb69e4c dfb69d90 813c606c 813ca424 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004f27 00000005 00010000 00000004 00000005 00000008 00000008 9dc0: 00000005 0000000a 00000100 00000002 00000001 00000001 00000001 00000006 9de0: 00000101 0000001f 0001a449 00000005 40000003 00000089 0000caa7 00000000 9e00: 20001e58 0000000b 00000e69 0000003c 00000008 00000006 00000000 fffffff8 9e20: 00000000 30220832 00000000 85cff240 83d0da80 200000c0 200000c0 841a4800 9e40: dfb69f14 dfb69e50 813c7038 813c5f78 00000000 00000000 00000000 30220832 9e60: 00000000 00000000 824625b4 0000005f 84235018 83d0dab0 84274294 841a4800 9e80: dfb69ee4 dfb69e90 807a779c 8079db94 00000064 00000001 00000000 dfb69eac 9ea0: 85c57850 83427d48 00006400 0000000b dfb69ea0 00000000 00000000 30220832 9ec0: 85cff240 40946400 200000c0 200000c0 85cff240 00000003 dfb69ef4 dfb69ee8 9ee0: 807a78bc 30220832 dfb69f14 40946400 00000000 85cff241 200000c0 85cff240 9f00: 00000003 841a4800 dfb69fa4 dfb69f18 805789d0 813c6a68 ecac8b10 841a4800 9f20: dfb69f3c dfb69f30 81a608b8 81a60788 dfb69f54 dfb69f40 8025c484 8028d914 9f40: dfb69fb0 40000000 dfb69f84 dfb69f58 802229ec 8025c440 00000000 8281cfb4 9f60: dfb69fb0 0014ced0 ecac8b10 80222940 00000000 30220832 dfb69fac 00000000 9f80: 00000000 00316308 00000036 8020029c 841a4800 00000036 00000000 dfb69fa8 9fa0: 80200060 805788ac 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76ffc0bc 9fe0: 76ffbec0 76ffbeb0 0001928c 00132970 60000010 00000003 00000000 00000000 Call trace: [<813ce31c>] (parport_attach) from [<813ca520>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:83d0dac4 r5:81e17bfc r4:829d1bf4 [<813ca418>] (comedi_device_attach) from [<813c606c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:841a4800 r7:200000c0 r6:b5403587 r5:83d0da80 r4:200000c0 [<813c5f6c>] (do_devconfig_ioctl) from [<813c7038>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:841a4800 r7:200000c0 r6:200000c0 r5:83d0da80 r4:85cff240 [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:841a4800 r9:00000003 r8:85cff240 r7:200000c0 r6:85cff241 r5:00000000 r4:40946400 [<805788a0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb69fa8 to 0xdfb69ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76ffc0bc 9fe0: 76ffbec0 76ffbeb0 0001928c 00132970 r10:00000036 r9:841a4800 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