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path: root/tools/testing/selftests/gen_kselftest_tar.sh
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#!/bin/bash
#
# gen_kselftest_tar
# Generate kselftest tarball
# Author: Shuah Khan <shuahkh@osg.samsung.com>
# Copyright (C) 2015 Samsung Electronics Co., Ltd.

# This software may be freely redistributed under the terms of the GNU
# General Public License (GPLv2).

# main
main()
{
	if [ "$#" -eq 0 ]; then
		echo "$0: Generating default compression gzip"
		copts="cvzf"
		ext=".tar.gz"
	else
		case "$1" in
			tar)
				copts="cvf"
				ext=".tar"
				;;
			targz)
				copts="cvzf"
				ext=".tar.gz"
				;;
			tarbz2)
				copts="cvjf"
				ext=".tar.bz2"
				;;
			tarxz)
				copts="cvJf"
				ext=".tar.xz"
				;;
			*)
			echo "Unknown tarball format $1"
			exit 1
			;;
	esac
	fi

	install_dir=./kselftest

# Run install using INSTALL_KSFT_PATH override to generate install
# directory
./kselftest_install.sh
tar $copts kselftest${ext} $install_dir
echo "Kselftest archive kselftest${ext} created!"

# clean up install directory
rm -rf kselftest
}

main "$@"
his was seen when performing CPU hotplug during I/O, as hangs in blk_mq_freeze_queue_wait where percpu_ref_kill (blk_mq_freeze_queue_start) raced with percpu_ref_tryget (blk_mq_timeout_work). Sample stack trace: __switch_to+0x2c0/0x450 __schedule+0x2f8/0x970 schedule+0x48/0xc0 blk_mq_freeze_queue_wait+0x94/0x120 blk_mq_queue_reinit_work+0xb8/0x180 blk_mq_queue_reinit_prepare+0x84/0xa0 cpuhp_invoke_callback+0x17c/0x600 cpuhp_up_callbacks+0x58/0x150 _cpu_up+0xf0/0x1c0 do_cpu_up+0x120/0x150 cpu_subsys_online+0x64/0xe0 device_online+0xb4/0x120 online_store+0xb4/0xc0 dev_attr_store+0x68/0xa0 sysfs_kf_write+0x80/0xb0 kernfs_fop_write+0x17c/0x250 __vfs_write+0x6c/0x1e0 vfs_write+0xd0/0x270 SyS_write+0x6c/0x110 system_call+0x38/0xe0 Examination of the queue showed a single reference (no PERCPU_COUNT_BIAS, and __PERCPU_REF_DEAD, __PERCPU_REF_ATOMIC set) and no requests. However, conditions at the time of the race are count of PERCPU_COUNT_BIAS + 0 and __PERCPU_REF_DEAD and __PERCPU_REF_ATOMIC set. The fix is to make the tryget routines use an actual boolean internally instead of the atomic long result truncated to a int. Fixes: e625305b3907 percpu-refcount: make percpu_ref based on longs instead of ints Link: https://bugzilla.kernel.org/show_bug.cgi?id=190751 Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints") Cc: stable@vger.kernel.org # v3.18+
Diffstat (limited to 'tools/perf/util/demangle-java.c')