New subject: [Bug 1036171] btrfs soft lockup kernel 4.10.9-1 ppc64le

26 Apr 2017

      http://bugzilla.suse.com/show_bug.cgi?id=1036171

            Bug ID: 1036171
           Summary: btrfs soft lockup kernel 4.10.9-1 ppc64le
    Classification: openSUSE
           Product: openSUSE Tumbleweed
           Version: Current
          Hardware: Other
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Kernel
          Assignee: kernel-maintainers@forge.provo.novell.com
          Reporter: normand@linux.vnet.ibm.com
        QA Contact: qa-bugs@suse.de
          Found By: ---
           Blocker: ---

btrfs soft lockup kernel 4.10.9-1 ppc64le

* Create an opensuse-Tumbleweed-ppc64le-20170420-Tumbleweed@ppc64le.qcow2
  from the openQA Tumbleweed-image test on a ppc64le host.
  This is an installed kde desktop with Snapshot 20170420 (1)
* Use this qcow2 in a "openqa_install+publish" openQA test (2)
  that reports soft lockup of btrfs (3)

* soft lockup reported on (3) has following call trace
  (manually copied from image)
  ===
  NMI watchdog: BUG: soft lockup - CPu#0 stuck for 22s! [btrfs:12057]
  Modules linked in: ...
  CPU: 0 PID: 12057 Comm: btrfs Not tainted 4.10.9-1-default #1
  ...
  Call Trace:
  btrfs_qgroup_trace_extend+0xf0/0x190 [btrfs] (unreliable)
  btrfs_qgroup_trace_leaf_items+0xc8/0x1d0 [btrfs]
  btrfs_qgroup_trace_subtree+0x308/0x4a0 [btrfs]
  replace_path+0x620/0x7d0 [btrfs]
  merge_reloc_root+0x284/0x670 [btrfs]
  merge_reloc_root+0xf0/0x2e0 [btrfs]
  relocate_block_group+0x4d4/0x7e0 [btrfs]
  btrfs_relocate_block_group+0x20c/0x300 [btrfs]
  btrfs_relocate_chunk+0x70/0x1a0 [btrfs]
  __btrfs_balance+0x66c/0xd30 [btrfs]
  btrfs_balance+0x408/0x680 [btrfs]
  btrfs_ioctl_balance+0x3c0/0x450 [btrfs]
  btrfs_ioctl+0x12e0/0x23e0 [btrfs]
  do_vfs_ioctl+0xd4/0x8c0
  SyS_ioctl+0xd4/0xf0
  system_call+0x38/0xe0

(1) https://openqa.opensuse.org/tests/390331
(2) https://openqa.opensuse.org/tests/391890
(3) https://openqa.opensuse.org/tests/391890#step/start_test/17

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[Bug 1036171] New: btrfs soft lockup kernel 4.10.9-1 ppc64le

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