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Groups > linux.debian.kernel > #63475

Bug#908216: btrfs blocked for more than 120 seconds

From "Russell Mosemann" <rmosemann@futurefoam.com>
Newsgroups linux.debian.bugs.dist, linux.debian.kernel
Subject Bug#908216: btrfs blocked for more than 120 seconds
Date 2019-03-02 13:00 +0100
Message-ID <xxbt7-6hp-3@gated-at.bofh.it> (permalink)
References (4 earlier) <xvCxr-2T4-3@gated-at.bofh.it> <xw6vv-6XA-1@gated-at.bofh.it> <xwafL-P8-1@gated-at.bofh.it> <wvon0-eY-13@gated-at.bofh.it> <xwafL-P8-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

Cross-posted to 2 groups.

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We continue to see hangs on one or more servers every night. It happens when copying a file into the btrfs partition. The result of the hang is that the CPU goes to 50% I/O wait or higher for hours. Only a reboot resets the process.
 
Based on this behavior and the kernel errors, it looks like btrfs has a bug with managing extents and caching in the presence of compression that causes it to go into an infinite loop that continually reads or writes to the disk. This seems to be 100% reproducible when the right file is found. Rebooting and immediately restarting the copy process with the same file results in the same hang.
 
--
Russell Mosemann

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Bug#908216: btrfs blocked for more than 120 seconds "Russell Mosemann" <rmosemann@futurefoam.com> - 2019-02-25 01:40 +0100
  Bug#908216: btrfs blocked for more than 120 seconds Nicholas D Steeves <nsteeves@gmail.com> - 2019-02-25 02:10 +0100
    Bug#908216: btrfs blocked for more than 120 seconds "Russell Mosemann" <rmosemann@futurefoam.com> - 2019-02-25 19:50 +0100
      Bug#908216: btrfs blocked for more than 120 seconds Nicholas D Steeves <nsteeves@gmail.com> - 2019-02-26 05:30 +0100
        Bug#908216: btrfs blocked for more than 120 seconds "Russell Mosemann" <rmosemann@futurefoam.com> - 2019-02-27 13:30 +0100
          Bug#908216: btrfs blocked for more than 120 seconds "Russell Mosemann" <rmosemann@futurefoam.com> - 2019-02-27 17:30 +0100
            Bug#908216: btrfs blocked for more than 120 seconds "Russell Mosemann" <rmosemann@futurefoam.com> - 2019-03-02 13:00 +0100
        Bug#908216: btrfs blocked for more than 120 seconds Nicholas D Steeves <nsteeves@gmail.com> - 2019-03-02 23:10 +0100
          Bug#908216: btrfs blocked for more than 120 seconds "Russell Mosemann" <rmosemann@futurefoam.com> - 2019-03-03 00:20 +0100
            Bug#908216: btrfs blocked for more than 120 seconds Nicholas D Steeves <nsteeves@gmail.com> - 2019-03-03 02:10 +0100
          Bug#908216: btrfs blocked for more than 120 seconds "Russell Mosemann" <rmosemann@futurefoam.com> - 2019-03-06 15:00 +0100
            Bug#908216: btrfs blocked for more than 120 seconds Nicholas D Steeves <nsteeves@gmail.com> - 2019-03-09 01:30 +0100

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