RHEL 6: Panic with RIP ext4_ext_put_in_cache due to BUG_ON(len == 0)

Solution Verified - Updated -

Issue

  • System got kernel panic at "kernel BUG at fs/ext4/extents.c:1973!"
kernel BUG at fs/ext4/extents.c:1973!
....
Pid: 13206, comm: save Tainted: P           ---------------    2.6.32-279.9.1.el6.x86_64 #1 Dell Inc. PowerEdge 2950/0J250G
RIP: 0010:[<ffffffffa06d9436>]  [<ffffffffa06d9436>] ext4_ext_put_in_cache+0x86/0x90 [ext4]
  • RHEV3.1 hypervisor or system with RHEL6.4 kernel panics with
kernel BUG at fs/ext4/extents.c:1992!
...
Pid: 28625, comm: dsmc Not tainted 2.6.32-358.2.1.el6.x86_64 #1 Red Hat RHEV Hypervisor
RIP: 0010:[<ffffffffa00b8b66>]  [<ffffffffa00b8b66>] ext4_ext_put_in_cache+0x86/0x90 [ext4]

Environment

  • Red Hat Enterprise Linux 6
    • Any kernel prior to kernel-2.6.32-431.el6 likely affected
    • seen on the following kernels: 2.6.32-279.9.1.el6, 2.6.32-358.2.1.el6
  • RHEV-H
    • Version prior to rhev-hypervisor6-6.5-20131115.0.3.2.iso
  • Ext4 filesystem

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