linux-kernel - [lkp] [string_helpers] 726ecfc321: test_string_helpers: Test 'test_string_get_size

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Message-ID: <20160506012646.GA4272@yexl-desktop>
Date:	Fri, 6 May 2016 09:26:46 +0800
From:	kernel test robot <xiaolong.ye@...el.com>
To:	James Bottomley <JBottomley@...n.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp] [string_helpers] 726ecfc321: test_string_helpers: Test
 'test_string_get_size_one' failed!

FYI, we noticed the following commit:

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-4.4.y
commit 726ecfc321994ec6ab044c1e3e5886408de991ac ("string_helpers: fix precision loss for some inputs")

on test machine: vm-kbuild-yocto-i386: 2 threads qemu-system-i386 -enable-kvm with 320M memory

caused below changes:


[    3.739370] test_string_helpers: Running tests...
[    3.739370] test_string_helpers: Running tests...
[    3.742931] test_string_helpers: Test 'test_string_get_size_one' failed!
[    3.742931] test_string_helpers: Test 'test_string_get_size_one' failed!
[    3.745727] test_string_helpers: string_get_size(size = 8192, blk_size = 4096, units = 0
[    3.745727] test_string_helpers: string_get_size(size = 8192, blk_size = 4096, units = 0
[    3.749051] test_string_helpers: expected: '32.7 MB', got '33.6 MB'
[    3.749051] test_string_helpers: expected: '32.7 MB', got '33.6 MB'


FYI, raw QEMU command line is:

	qemu-system-i386 -enable-kvm -kernel /pkg/linux/i386-randconfig-w1-201616/gcc-5/726ecfc321994ec6ab044c1e3e5886408de991ac/vmlinuz-4.4.2-00096-g726ecfc -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-yocto-i386-43/rand_boot-1-yocto-minimal-i386.cgz-i386-randconfig-w1-201616-726ecfc321994ec6ab044c1e3e5886408de991ac-20160420-34890-1vs11no-0.yaml ARCH=i386 kconfig=i386-randconfig-w1-201616 branch=internal-chrome-os/chromeos-4.4 commit=726ecfc321994ec6ab044c1e3e5886408de991ac BOOT_IMAGE=/pkg/linux/i386-randconfig-w1-201616/gcc-5/726ecfc321994ec6ab044c1e3e5886408de991ac/vmlinuz-4.4.2-00096-g726ecfc max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-yocto-i386/yocto-minimal-i386.cgz/i386-randconfig-w1-201616/gcc-5/726ecfc321994ec6ab044c1e3e5886408de991ac/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal rw ip=::::vm-kbuild-yocto-i386-43::dhcp drbd.minor_count=8'  -initrd /fs/sdg1/initrd-vm-kbuild-yocto-i386-43 -m 320 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -drive file=/fs/sdg1/disk0-vm-kbuild-yocto-i386-43,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-kbuild-yocto-i386-43 -serial file:/dev/shm/kboot/serial-vm-kbuild-yocto-i386-43 -daemonize -display none -monitor null 





Thanks,
Xiaolong

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