A GFS2 filesystem hangs because a glock could not be demoted.

Solution In Progress - Updated -

Issue

  • A GFS2 filesystem hangs because a glock could not be demoted. The demote time keeps increasing to ever increasing larger number:
 G:  s:EX n:2/16 f:DIqob t:EX d:SH/63555930000 a:0 v:0 r:40 m:200
    H: s:EX f:H e:0 p:21695 [sas] gfs2_unlink+0x7e/0x250 [gfs2]       
    [...] almost 40 waiters behind holder and end                      
    H: s:SH f:AW e:0 p:549 [wscanhw] gfs2_getattr+0xcf/0x1d0 [gfs2]
    I: n:1/22 t:4 f:0x00 d:0x00000001 s:3864

Environment

  • Red Hat Enterprise Linux 6, 7 with High Availability Add-on
  • Use of a GFS2 filesystem

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