================================================================== BUG: KASAN: out-of-bounds in get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline] BUG: KASAN: out-of-bounds in __unwind_start+0x3a7/0x3c0 arch/x86/kernel/unwind_frame.c:76 Read of size 8 at addr ffff8801b632fbd8 by task syzkaller776934/8981 CPU: 0 PID: 8981 Comm: syzkaller776934 Not tainted 4.9.81-gf8bbe51 #32 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801b5e07788 ffffffff81d94e69 ffffea0006d8cbc0 ffff8801b632fbd8 0000000000000000 ffff8801b632fbe0 ffff8801b5e078b8 ffff8801b5e077c0 ffffffff8153e1e3 ffff8801b632fbd8 0000000000000008 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x73/0x280 mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report+0x275/0x360 mm/kasan/report.c:408 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429 [] get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline] [] __unwind_start+0x3a7/0x3c0 arch/x86/kernel/unwind_frame.c:76 [] unwind_start arch/x86/include/asm/unwind.h:39 [inline] [] __save_stack_trace+0x59/0xf0 arch/x86/kernel/stacktrace.c:41 [] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71 [] proc_pid_stack+0x146/0x230 fs/proc/base.c:466 [] proc_single_show+0xf8/0x170 fs/proc/base.c:768 [] seq_read+0x32f/0x1290 fs/seq_file.c:240 [] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714 [] do_loop_readv_writev fs/read_write.c:880 [inline] [] do_readv_writev+0x520/0x750 fs/read_write.c:874 [] vfs_readv+0x84/0xc0 fs/read_write.c:898 [] do_readv+0xe6/0x250 fs/read_write.c:924 [] SYSC_readv fs/read_write.c:1011 [inline] [] SyS_readv+0x27/0x30 fs/read_write.c:1008 [] do_syscall_64+0x1a5/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 The buggy address belongs to the page: page:ffffea0006d8cbc0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x8000000000000000() page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801b632fa80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801b632fb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801b632fb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8801b632fc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801b632fc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================