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Fix taskq creation failure in vdev_open_children()

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When creating and destroying pools in tight loop it's possible to
exhaust the number of allowed threads on a system.  This results
in taskq_create() failling and a NULL dereference.

Resolve the issue by falling back to opening the vdevs all
synchronously.

Reviewed-by: Denys Rtveliashvili <denys@rtveliashvili.name>
Reviewed-by: Håkan Johansson <f96hajo@chalmers.se>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes zfsonlinux/spl#521
Closes #4637
This commit is contained in:
Brian Behlendorf
2016-10-24 13:28:58 -07:00
committed by GitHub
parent 1bbd877049
commit 13d9a004fe
6 changed files with 155 additions and 0 deletions
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config/user-commands.m4
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@@ -89,6 +89,7 @@ AC_DEFUN([ZFS_AC_CONFIG_USER_COMMANDS_COMMON], [
AC_PATH_TOOL(USERADD, useradd, "/usr/sbin/useradd")
AC_PATH_TOOL(USERDEL, userdel, "/usr/sbin/userdel")
AC_PATH_TOOL(USERMOD, usermod, "/usr/sbin/usermod")
AC_PATH_TOOL(UUIDGEN, uuidgen, "")
AC_PATH_TOOL(WAIT, wait, "wait") dnl # Builtin in bash
AC_PATH_TOOL(WC, wc, "")
])