Support UBSAN reports

[lzaoral]

Example output:

byteorder.h:83:9: runtime error: load of misaligned address 0x556e3e877805 for type 'const uint32_t', which requires 4 byte alignment
0x556e3e877805: note: pointer points here
 b5 21 00 00 6c 00 00  07 ff 65 a0 b8 03 05 2f  74 65 78 74 0e 70 d6 f0  d2 4d 97 21 a4 81 00 00  a0
             ^
    #0 0x556e3dc9349f in IVALu /builddir/build/BUILD/rsync-3.2.3/byteorder.h:83
    #1 0x556e3dc9349f in IVAL /builddir/build/BUILD/rsync-3.2.3/byteorder.h:124
    #2 0x556e3dc9349f in raw_read_int /builddir/build/BUILD/rsync-3.2.3/io.c:921
    #3 0x556e3dc9349f in read_a_msg /builddir/build/BUILD/rsync-3.2.3/io.c:1441
    #4 0x556e3dc93b23 in read_buf /builddir/build/BUILD/rsync-3.2.3/io.c:1853
    #5 0x556e3dc958d1 in read_ndx /builddir/build/BUILD/rsync-3.2.3/io.c:2241
    #6 0x556e3dc31316 in read_ndx_and_attrs /builddir/build/BUILD/rsync-3.2.3/rsync.c:330
    #7 0x556e3dc43f51 in recv_files /builddir/build/BUILD/rsync-3.2.3/receiver.c:548
    #8 0x556e3dc664b2 in do_recv /builddir/build/BUILD/rsync-3.2.3/main.c:1048
    #9 0x556e3dc66fc7 in do_server_recv /builddir/build/BUILD/rsync-3.2.3/main.c:1219
    #10 0x556e3dc66fc7 in start_server /builddir/build/BUILD/rsync-3.2.3/main.c:1253
    #11 0x556e3dc67418 in child_main /builddir/build/BUILD/rsync-3.2.3/main.c:1226
    #12 0x556e3dcca5f2 in local_child /builddir/build/BUILD/rsync-3.2.3/pipe.c:166
    #13 0x556e3dc0bb33 in do_cmd /builddir/build/BUILD/rsync-3.2.3/main.c:650
    #14 0x556e3dc0bb33 in start_client /builddir/build/BUILD/rsync-3.2.3/main.c:1576
    #15 0x556e3dc0bb33 in main /builddir/build/BUILD/rsync-3.2.3/main.c:1819
    #16 0x7fc94402950f in __libc_start_call_main (/lib64/libc.so.6+0x2950f)
    #17 0x7fc9440295c8 in __libc_start_main_alias_2 (/lib64/libc.so.6+0x295c8)
    #18 0x556e3dc0f324 in _start (/builddir/build/BUILD/rsync-3.2.3/rsync+0xbe324)

(the extra newline at the end is not a typo)

Simple converter for inspiration:

#!/usr/bin/env python3

import re
import sys

with open(sys.argv[1]) as f:
    for line in f:
        if not line.strip():
            continue

        line = line.rstrip().replace('runtime ', '')

        # backtrace
        # #14 0x556e3dc0bb33 in start_client /builddir/build/BUILD/rsync-3.2.3/main.c:1576
        if re.match(r'^\s*#\d+', line):
            num, addr, _, symbol, loc = line.split()
            if loc.startswith('(') and loc.endswith(')'):
                loc = loc[1:-1]

            print(f'{loc}: note: {symbol} {num} {addr}')
            continue

        print(line)

[lzaoral]

Note that the stack trace is optional.