10715a0187
When your kernel is built with kernel stack tracing enabled and you have the debugfs filesystem mounted. Then the zfs.sh script will clear the worst observed kernel stack depth on module load and check the worst case usage on module removal. If the stack depth ever exceeds 7000 bytes the full stack will be printed for debugging. This is dangerously close to overrunning the default 8k stack. This additional advisory debugging is particularly valuable when running the regression tests on a kernel built with 16k stacks. In this case, almost no matter how bad the stack overrun is you will see be able to get a clean stack trace for debugging. Since the worst case stack usage can be highly variable it's helpful to always check the worst case usage.
79 lines
1.1 KiB
Bash
Executable File
79 lines
1.1 KiB
Bash
Executable File
#!/bin/bash
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#
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# A simple script to simply the loading/unloading the ZFS module stack.
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basedir="$(dirname $0)"
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SCRIPT_COMMON=common.sh
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if [ -f "${basedir}/${SCRIPT_COMMON}" ]; then
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. "${basedir}/${SCRIPT_COMMON}"
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else
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echo "Missing helper script ${SCRIPT_COMMON}" && exit 1
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fi
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PROG=zfs.sh
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UNLOAD=
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usage() {
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cat << EOF
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USAGE:
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$0 [hvud] [module-options]
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DESCRIPTION:
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Load/unload the ZFS module stack.
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OPTIONS:
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-h Show this message
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-v Verbose
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-u Unload modules
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-d Save debug log on unload
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MODULE-OPTIONS:
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Must be of the from module="options", for example:
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$0 zfs="zfs_prefetch_disable=1"
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$0 zfs="zfs_prefetch_disable=1 zfs_mdcomp_disable=1"
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$0 spl="spl_debug_mask=0"
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EOF
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}
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while getopts 'hvud' OPTION; do
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case $OPTION in
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h)
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usage
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exit 1
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;;
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v)
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VERBOSE=1
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;;
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u)
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UNLOAD=1
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;;
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d)
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DUMP_LOG=1
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;;
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?)
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usage
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exit
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;;
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esac
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done
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if [ $(id -u) != 0 ]; then
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die "Must run as root"
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fi
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if [ ${UNLOAD} ]; then
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umount -t zfs -a
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stack_check
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unload_modules
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else
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stack_clear
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check_modules || die "${ERROR}"
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load_modules "$@"
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wait_udev /dev/zfs 30
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fi
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exit 0
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