Cronet crashes on iOS

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Mar 5, 2023, 2:19:35 PM3/5/23

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hi guys,

There is a crash of iOS Cronet which is encountered randomly from users,

Here is part of the stack trace that desymbolised and formatted a bit.

Crashed: ThreadPoolForegroundWorker

0 Cronet Line info: file 'crc32.c', line 337, column 9, start file 'crc32.c', start line 320

    buf4 = (const z_crc_t FAR *)(const void FAR *)buf;
    while (len >= 32) {
        DOLIT32; <- here
        len -= 32;
    }

1 Cronet Line info: file 'simple_util.cc', line 124, column 3, start file 'simple_util.cc', start line 123

uint32_t IncrementalCrc32(uint32_t previous_crc, const char* data, int length) {
  return crc32(previous_crc, reinterpret_cast<const Bytef*>(data), length); <- here
}

2 Cronet Line info: file 'simple_synchronous_entry.cc', line 660, column 37, start file 'simple_synchronous_entry.cc', start line 561

  if (in_entry_op.request_update_crc && buf_len > 0) {
    out_write_result->updated_crc32 = simple_util::IncrementalCrc32(
        in_entry_op.previous_crc32, in_buf->data(), buf_len); <- here
    out_write_result->crc_updated = true;
  }

3 Cronet Line info: file 'bind_internal.h', line 779, column 5, start file 'bind_internal.h', start line 768

    return InvokeHelper<is_weak_call, R>::MakeItSo(
        std::forward<Functor>(functor),
        Unwrap(std::get<indices>(std::forward<BoundArgsTuple>(bound)))...,
        std::forward<UnboundArgs>(unbound_args)...);

Looks like it happens when caching something to disk, however I don't know how to reproduce that. Is there anyone who has idea about this please?