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Solaris 11 or Solaris 10 can panic with Deadlock: cycle in blocking chain when executing within zvol_close and zvol_update_minors ZFS code (Doc ID 2402539.1)

Last updated on OCTOBER 06, 2021

Applies to:

Solaris Operating System - Version 10 to 11.3 [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 look similar to one of the two shown here:

turnstile_block
rw_enter_sleep
*
zvol_close
zfsdev_close

or

turnstile_block
mutex_vector_enter
*
zvol_update_minors
zfs_ioc_rename

Cause

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In this Document
Symptoms
Cause
Solution

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