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    <head>
      <base href="https://bugs.llvm.org/">
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - SIGCHLD prevents from entering breakpoint"
   href="https://bugs.llvm.org/show_bug.cgi?id=47952">47952</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>SIGCHLD prevents from entering breakpoint
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>lldb
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>11.0
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>All Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>lldb-dev@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>artemhevorhian@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>jdevlieghere@apple.com, llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>- Running Ubuntu 18.04.
- Binaries for reproduction:
  - Download Swift 5.3 toolchain:
<a href="https://swift.org/builds/swift-5.3-release/ubuntu1804/swift-5.3-RELEASE/swift-5.3-RELEASE-ubuntu18.04.tar.gz">https://swift.org/builds/swift-5.3-release/ubuntu1804/swift-5.3-RELEASE/swift-5.3-RELEASE-ubuntu18.04.tar.gz</a>
  - Download llvm toolchain v.11. 
- Commands:
  - `lldb $swiftc`, `swiftc` is path to Swift compiler.
  - Inside LLDB run:
    - `breakpoint set --name Lexer` - should see this:
      - `Breakpoint 1: 8 locations.`
    - `run main.swift`, where `main.swift` is a file with the following
contents:
      - `func fibbonaci(n: Int) { print("hello") }`
    AT THIS POINT, I EXPECT LLDB TO STOP AT BREAKPOINT, 
    INSTEAD, IT MISSES THE BREAKPOINT AND FINISHES EXECUTION OF THE PROGRAM,
    REPORTING THIS ALONG THE WAY (3 TIMES):
      - `Process` X `stopped and restarted: thread 1 received signal: SIGCHLD`

Have checked this SO thread, configured the signal handler for SIGCHLD in this
way :
- `pro hand -p true -s false SIGCHLD`
With this configuration, the behaviour of lldb is completely the same as
described above.</pre>
        </div>
      </p>


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