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Date: Fri, 18 Sep 2015 19:46:10 +0300 From: Artem Bityutskiy <dedekind1@...il.com> To: LKML <linux-kernel@...r.kernel.org> Subject: sync issues in 4.3-rc1? Hi, I observe a problem in 4.3-rc1 which looks like there are issues with sync - it does not really sync all. It is Firday night here, and I am dropping a quick report, I did not spend much time investigating it. Symptoms: 1. I Run v4.3-rc1 + Fedora 22, most FC22 services disabled, no GUI, minimal FC22 system, quite silent. 2. I copy a directory with a bunch of files, let's call it "dir". In my case this is just the kernel modules tree (produces with 'make modules_install'). 3. Run 'halt' or 'poweroff' 4. After the system boots up, very often, but not always, "dir" is corrupted. I did not do strict verification, but corruption seems to be that files are there, but some are corrupted. I checked one file - xfs.ko - it starts with a bunch of zero bytes, while the original does not start with zeroes. I've done this quick test - run the following short shell script with 4.3-rc1 and in 4.2 and get different results. The system is otherwise the same just kernel is different. $ while true; do rm -rf ~/4.3.0-rc1/; cp -r /usr/lib/modules/4.3.0-rc1 ~/ && sync && grep Dirty /proc/meminfo; done I get 0's more consistently in case of v4.2. It does not necessary mean anything, but looks suspicious. Here are the numbers. v4.2 Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 116 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 456 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 160 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 456 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 72 kB Dirty: 0 kB Dirty: 12 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB v4.3-rc1 Dirty: 752 kB Dirty: 752 kB Dirty: 60 kB Dirty: 812 kB Dirty: 688 kB Dirty: 0 kB Dirty: 424 kB Dirty: 0 kB Dirty: 632 kB Dirty: 0 kB Dirty: 272 kB Dirty: 272 kB Dirty: 0 kB Dirty: 188 kB Dirty: 940 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 1624 kB Dirty: 0 kB Dirty: 424 kB Dirty: 316 kB Dirty: 1068 kB Dirty: 316 kB Dirty: 0 kB Dirty: 0 kB Dirty: 448 kB Dirty: 0 kB Dirty: 752 kB Dirty: 0 kB Dirty: 424 kB Dirty: 0 kB Dirty: 804 kB Dirty: 804 kB Dirty: 804 kB Dirty: 840 kB Dirty: 840 kB Dirty: 888 kB Dirty: 0 kB Dirty: 424 kB Dirty: 112 kB Dirty: 112 kB Dirty: 112 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 224 kB Dirty: 276 kB Dirty: 276 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB Dirty: 752 kB Dirty: 872 kB Dirty: 752 kB Dirty: 0 kB Dirty: 448 kB Dirty: 0 kB Dirty: 0 kB Dirty: 544 kB Dirty: 544 kB Dirty: 216 kB Dirty: 0 kB Dirty: 0 kB Dirty: 448 kB Dirty: 0 kB Dirty: 0 kB Dirty: 0 kB -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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