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Solaris 11 or Solaris 10 can panic: Deadlock: cycle in blocking chain (Doc ID 2394213.1)

Last updated on MAY 02, 2018

Applies to:

Solaris Operating System - Version 10 3/05 to 11.1 [Release 10.0 to 11.0]
Oracle Solaris on SPARC (64-bit)
Oracle Solaris on x86-64 (64-bit)

Symptoms

The panic string will be: Deadlock: cycle in blocking chain

The panic stack will be similar to this:

genunix:turnstile_block
unix:rw_enter_sleep
unix:rw_enter - frame recycled
zfs:dbuf_verify
zfs:dbuf_rele_and_unlock
zfs:dmu_buf_rele - frame recycled
zfs:dbuf_evict
zfs:dnode_evict_dbufs
zfs:dnode_sync_free
zfs:dnode_sync - frame recycled
zfs:dmu_objset_sync_dnodes
zfs:dmu_objset_sync
zfs:dsl_dataset_sync - frame recycled
zfs:dsl_pool_sync
zfs:spa_sync
zfs:txg_sync_thread
unix:thread_start

Cause

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