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==1588==ERROR: AddressSanitizer: heap-use-after-free on address 0x612000003132 at pc 0x7f9598f0b4bf bp 0x7ffed0cda440 sp 0x7ffed0cda438
READ of size 1 at 0x612000003132 thread T0
    #0 0x7f9598f0b4be in ustream_write_pending /home/hauke/openwrt/openwrt/build_dir/target-x86_64_glibc/libubox-2020-12-12-35787769/ustream.c:407
    #1 0x7f9598f0c025 in __ustream_fd_poll /home/hauke/openwrt/openwrt/build_dir/target-x86_64_glibc/libubox-2020-12-12-35787769/ustream-fd.c:125
    #2 0x7f9598f08a70 in uloop_run_events /home/hauke/openwrt/openwrt/build_dir/target-x86_64_glibc/libubox-2020-12-12-35787769/uloop.c:198
    #3 0x7f9598f08a70 in uloop_run_timeout /home/hauke/openwrt/openwrt/build_dir/target-x86_64_glibc/libubox-2020-12-12-35787769/uloop.c:555
    #4 0x402151  (/sbin/logd+0x402151)
    #5 0x7f9598d44cf9 in __libc_start_main (/lib/libc.so.6+0x23cf9)
    #6 0x4021e9  (/sbin/logd+0x4021e9)

0x612000003132 is located 242 bytes inside of 272-byte region [0x612000003040,0x612000003150)
freed by thread T0 here:
    #0 0x7f9598fac755 in __interceptor_free (/lib/libasan.so.6+0x8b755)
    #1 0x7f9598f0b496 in ustream_write_pending /home/hauke/openwrt/openwrt/build_dir/target-x86_64_glibc/libubox-2020-12-12-35787769/ustream.c:405

previously allocated by thread T0 here:
    #0 0x7f9598facabe in calloc (/lib/libasan.so.6+0x8babe)
    #1 0x402c56  (/sbin/logd+0x402c56)

SUMMARY: AddressSanitizer: heap-use-after-free /home/hauke/openwrt/openwrt/build_dir/target-x86_64_glibc/libubox-2020-12-12-35787769/ustream.c:407 in ustream_write_pending
Shadow bytes around the buggy address:
  0x0c247fff85d0: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
  0x0c247fff85e0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c247fff85f0: fd fd fd fd fd fd fd fd fd fd fd fa fa fa fa fa
  0x0c247fff8600: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
  0x0c247fff8610: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
=>0x0c247fff8620: fd fd fd fd fd fd[fd]fd fd fd fa fa fa fa fa fa
  0x0c247fff8630: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
  0x0c247fff8640: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c247fff8650: fd fd fd fd fd fd fd fd fd fd fd fd fa fa fa fa
  0x0c247fff8660: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
  0x0c247fff8670: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
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