Hi All,

I have observed following KASAN error with 4.14.56 kernel. Can you please copy change-[1](kasan: add no_sanitize attribute for clang builds) into stable kernels?

[1] - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/in...

================================================================== BUG: KASAN: out-of-bounds in __read_once_size_nocheck include/linux/compiler.h:196 [inline] BUG: KASAN: out-of-bounds in unwind_frame+0xc4/0x324 arch/arm64/kernel/stacktrace.c:56 Read of size 8 at addr ffffffe3123ff4b0 by task poc/15233

CPU: 7 PID: 15233 Comm: poc Tainted: G S W O 4.14.56+ #3 Hardware name: Qualcomm Technologies, Inc. Call trace: dump_backtrace+0x0/0x388 show_stack+0x24/0x30 __dump_stack+0x24/0x2c dump_stack+0x8c/0xd0 print_address_description+0x74/0x234 kasan_report+0x240/0x264 __asan_report_load8_noabort+0x2c/0x38 unwind_frame+0xc4/0x324 walk_stackframe+0x44/0x6c __save_stack_trace+0x250/0x444 save_stack_trace_tsk+0x2c/0x38 proc_pid_stack+0x134/0x268 proc_single_show+0xdc/0x130 traverse+0x244/0x5b0 seq_lseek+0x10c/0x27c vfs_llseek+0xb4/0xe4 SyS_lseek+0x54/0xa0 el0_svc_naked+0x34/0x38

The buggy address belongs to the page: page:ffffffbf8c48ffc0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x0() raw: 0000000000000000 0000000000000000 0000000000000000 00000000ffffffff raw: 0000000000000000 dead000000000200 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected page_owner info is not active (free page?)

Memory state around the buggy address: ffffffe3123ff380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffe3123ff400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

ffffffe3123ff480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

^ ffffffe3123ff500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffe3123ff580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================

-Thanks, Prasad