WtCursor cursor = session.openCursor(tableUri, "bulk");
            {
                std::string value = "value";
                cursor->set_key(cursor.get(), "key1");
                cursor->set_value(cursor.get(), value.c_str());
                cursor.save();
            }

            {
                cursor->set_key(cursor.get(), "key2"); // gets into `__wt_cursor_copy_release_item(value)` which attempts to copy out the previous value set. But that variable is now out of scope.
                cursor->set_value(cursor.get(), "value");
                cursor.save();
            }

==13666==ERROR: AddressSanitizer: stack-use-after-scope on address 0x7ffc5e06fe60 at pc 0x000000441504 bp 0x7ffc5e06fa60 sp 0x7ffc5e06f200
READ of size 6 at 0x7ffc5e06fe60 thread T0
    #0 0x441503 in memcpy /data/mci/bc90f05be614b5760ea98b96a5a10212/toolchain-builder/tmp/build-llvm.sh-2ni/llvm/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:792:5
    #1 0x7f081885f774 in __wt_buf_grow_worker /home/dgottlieb/xgen/wiredtiger/src/support/scratch.c:55
    #2 0x7f08187910ab in __wt_buf_grow /home/dgottlieb/xgen/wiredtiger/./src/include/buf.i:17
    #3 0x7f081879118e in __wt_buf_set /home/dgottlieb/xgen/wiredtiger/./src/include/buf.i:80
    #4 0x7f0818794d06 in __wt_cursor_copy_release_item /home/dgottlieb/xgen/wiredtiger/src/cursor/cur_std.c:249
    #5 0x7f0818791447 in __cursor_copy_release /home/dgottlieb/xgen/wiredtiger/./src/include/cursor.i:29
    #6 0x7f081879741f in __wt_cursor_set_valuev /home/dgottlieb/xgen/wiredtiger/src/cursor/cur_std.c:578
    #7 0x7f0818796fa4 in __wt_cursor_set_value /home/dgottlieb/xgen/wiredtiger/src/cursor/cur_std.c:556
    #8 0x501885 in main /home/dgottlieb/xgen/scratch/stack_use_after_scope.cpp:28:5
    #9 0x7f081777182f in __libc_start_main /build/glibc-LK5gWL/glibc-2.23/csu/../csu/libc-start.c:291
    #10 0x427228 in _start (/home/dgottlieb/xgen/scratch/a.out+0x427228)

Address 0x7ffc5e06fe60 is located in stack of thread T0 at offset 224 in frame
    #0 0x5011df in main /home/dgottlieb/xgen/scratch/stack_use_after_scope.cpp:5

  This frame has 7 object(s):
    [32, 40) 'conn' (line 6)
    [64, 72) 'cursor' (line 7)
    [96, 104) 'session' (line 8)
    [128, 160) 'tableUri' (line 11)
    [192, 193) 'ref.tmp' (line 11)
    [208, 240) 'value' (line 22) <== Memory access at offset 224 is inside this variable
    [272, 273) 'ref.tmp15' (line 22)
HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-use-after-scope /data/mci/bc90f05be614b5760ea98b96a5a10212/toolchain-builder/tmp/build-llvm.sh-2ni/llvm/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:792:5 in memcpy
Shadow bytes around the buggy address:
  0x10000bc05f70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10000bc05f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10000bc05f90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10000bc05fa0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10000bc05fb0: f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2 00 f2 f2 f2
=>0x10000bc05fc0: 00 00 00 00 f2 f2 f2 f2 f8 f2 f8 f8[f8]f8 f2 f2
  0x10000bc05fd0: f2 f2 f8 f3 00 00 00 00 00 00 00 00 00 00 00 00
  0x10000bc05fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10000bc05ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10000bc06000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10000bc06010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
  Shadow gap:              cc
==13666==ABORTING