Process blocked in do_get_write_access
Issue
- Process blocked in do_get_write_access
crash> bt ffff88380e6ea040
PID: 28626 TASK: ffff88380e6ea040 CPU: 1 COMMAND: "sas"
#0 [ffff88380949f878] schedule at ffffffff8150e172
#1 [ffff88380949f940] do_get_write_access at ffffffffa056709d [jbd2]
#2 [ffff88380949fa20] jbd2_journal_get_write_access at ffffffffa0567471 [jbd2]
#3 [ffff88380949fa40] __ext4_journal_get_write_access at ffffffffa05a96d8 [ext4]
- Reports of hung task watchdog panics due to tasks being blocked in do_get_write_access() on shadow journal buffers.
Environment
- Red Hat Enterprise Linux 6.1 and above
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