ASan: stack-buffer-overflow in exit_thread_helper

stack-buffer-overflow on address 0x7ffcf60fe960 at pc 0x000000401de7 bp 0x7f78f90f7270 sp 0x7f78f90f7268

READ of size 4 at 0x7ffcf60fe960 thread T1

    #0 0x401de6 in exit_thread_helper /home/couchbase/jenkins/workspace/kv_engine-post-commit-master/couchstore/src/views/bin/util.cc:47

    #1 0x7f79027f564a in CouchbaseThread::run() /home/couchbase/jenkins/workspace/kv_engine-post-commit-master/platform/src/cb_pthreads.cc:51

    #2 0x7f79027f564a in platform_thread_wrap /home/couchbase/jenkins/workspace/kv_engine-post-commit-master/platform/src/cb_pthreads.cc:64

    #3 0x7f7900f326da in start_thread /build/glibc-S9d2JN/glibc-2.27/nptl/pthread_create.c:463

    #4 0x7f78fcb6a71e in __clone (/lib/x86_64-linux-gnu/libc.so.6+0x12171e)

Address 0x7ffcf60fe960 is located in stack of thread T0 at offset 272 in frame

    #0 0x7f790274717f in init_terminator_thread() /home/couchbase/jenkins/workspace/kv_engine-post-commit-master/couchstore/src/views/mapreduce/mapreduce_c.cc:366

  This frame has 8 object(s):

    [32, 40) 'initGuard' (line 367)

    [64, 72) ''

    [96, 104) ''

    [128, 136) ''

    [160, 168) '__tmp'

    [192, 200) ''

    [224, 232) ''

    [256, 264) '' <== Memory access at offset 272 overflows this variable

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-buffer-overflow /home/couchbase/jenkins/workspace/kv_engine-post-commit-master/couchstore/src/views/bin/util.cc:47 in exit_thread_helper

Shadow bytes around the buggy address:

  0x10001ec17cd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x10001ec17ce0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x10001ec17cf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x10001ec17d00: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2

  0x10001ec17d10: f2 f2 f8 f2 f2 f2 00 f2 f2 f2 00 f2 f2 f2 00 f2

=>0x10001ec17d20: f2 f2 00 f2 f2 f2 f8 f2 f2 f2 00 f3[f3]f3 00 00

  0x10001ec17d30: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2

  0x10001ec17d40: 00 f2 f2 f2 00 f2 f2 f2 00 00 00 f3 f3 f3 f3 f3

  0x10001ec17d50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x10001ec17d60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x10001ec17d70: 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

Thread T1 created by T0 here:

    #0 0x7f7903024822 in pthread_create (/opt/gcc-10.2.0/lib64/libasan.so.6+0x57822)

    #1 0x7f79027f50d3 in cb_create_named_thread(unsigned long*, void (*)(void*), void*, int, char const*) /home/couchbase/jenkins/workspace/kv_engine-post-commit-master/platform/src/cb_pthreads.cc:102

    #2 0x401e93 in start_exit_listener(unsigned long*, int) /home/couchbase/jenkins/workspace/kv_engine-post-commit-master/couchstore/src/views/bin/util.cc:64

    #3 0x401837 in main /home/couchbase/jenkins/workspace/kv_engine-post-commit-master/couchstore/src/views/bin/couch_view_group_cleanup.cc:64

    #4 0x7f78fca6abf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)