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RHEL6:冻结的 ext4 文件系统上的死锁,一个进程卡在 thaw_bdev 中,等待进行回写的 flush 线程所持有的信号量,并卡在 start_this_handle 中

Solution In Progress - Updated -

Issue

  • vmtoolsd 冻结了文件系统,且无法解冻,因为它由于文件系统的冻结日志而卡住了
  • 调用 ioctl FITHAW 操作时,vmtoolsd 在快照操作过程中挂起
  • 进程卡在 thaw_bdev 在 rwsem_down_write_failed 中等待
  • 持有信号量的 flush 线程在执行回写,并卡在 start_this_handle

Environment

  • Redhat Enterprise Linux 6
    • 2.6.32-358.el6 之前的内核
  • ext4 文件系统
  • VMware 客户机
  • fsfreeze
  • vmtoolsd

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