From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xiaoguang Wang Date: Mon, 18 Apr 2016 11:37:54 +0800 Subject: [LTP] [PATCH v2] inotify: Add test for inotify mark destruction race In-Reply-To: <20160414084611.GC2753@quack2.suse.cz> References: <1439215460-15670-1-git-send-email-jack@suse.com> <20150811141432.GA21861@rei.suse.de> <20150811142035.GD2659@quack.suse.cz> <20150825092925.GA19905@rei.suse.de> <20150825103803.GA15280@quack.suse.cz> <20150825112920.GB20082@rei.suse.de> <570EFB43.3020704@cn.fujitsu.com> <20160414081516.GA2753@quack2.suse.cz> <570F5161.7060806@cn.fujitsu.com> <20160414084611.GC2753@quack2.suse.cz> Message-ID: <57145692.6070205@cn.fujitsu.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ltp@lists.linux.it hello, On 04/14/2016 04:46 PM, Jan Kara wrote: > On Thu 14-04-16 16:14:25, Xiaoguang Wang wrote: >> On 04/14/2016 04:15 PM, Jan Kara wrote: >>> Hello, >>> >>> On Thu 14-04-16 10:06:59, Xiaoguang Wang wrote: >>>> On 08/25/2015 07:29 PM, Cyril Hrubis wrote: >>>>> Hi! >>>>>> Interesting, probably SRCU is much slower with this older kernel. From my >>>>>> experiments 100 iterations isn't quite reliable to trigger the oops in my >>>>>> testing instance. But 400 seem to be good enough. >>>>> >>>>> I've changed the nuber of iterations to 400 and pushed it to git, >>>>> thanks. >>>>> >>>> >>>> In upstream kernel v4.6-rc3-17-g1c74a7f and RHEL7.2GA, I sometimes get such >>>> error: >>>> --------------------------------------------------------------------------- >>>> inotify06 1 TBROK : inotify06.c:104: inotify_init failed: errno=EMFILE(24): Too many open files >>>> inotify06 2 TBROK : inotify06.c:104: Remaining cases broken >>>> --------------------------------------------------------------------------- >>>> But look at the inotify06.c, inotify_fd is closed every iteration. >>>> For normal file descriptors, "close(fd) succeeds" does not mean related kernel >>>> resources have been released immediately(processes may still reference fd). >>>> >>>> Then inotify_fd also has similar behavior? Even close(inotify_fd) returns, >>>> that does not mean the number of current inotify instances have decreased one >>>> immediately, then later inotify_init() calls may exceeds the /proc/sys/fs/inotify/max_user_instances and >>>> return EMFILE error? I had added some debug code in kernel, it seems that close(inotify_fd) >>>> does not make sure current inotify instances decreases one immediately. >>>> >>>> So I'd like to know this is expected behavior for inotify? If yes, we can >>>> echo 400 > /proc/sys/fs/inotify/max_user_instances to avoid EMFILE error. >>>> If not, this is a kernel bug? >>> >>> Interesting, I've never seen this. Number of inotify instances is maintaned >>> immediately - i.e., it is dropped as soon as the last descriptor pointing to >>> the instance is closed. So I'm not sure how what you describe can happen. >>> How do you reproduce the issue? >> I just call ./inotify06 directly, and about 50% chance, it'll fail(return EMFILE). > > Hum, I've just tried 4.6-rc1 which I have running on one test machine and > it survives hundreds of inotify06 calls in a loop without issues. I have > max_user_instances set to 128 on that machine... So I suspect the problem > is somewhere in your exact userspace setup. Aren't there other processes > using inotify heavily for that user? I doubted so, but please see my debug results in my virtual machine, it still seems that it's a kernel issue... I add some simple debug code to kernel and ltp test case inotify06, and switched to a normal user "lege" to have a test. [lege@localhost inotify]$ uname -r 4.6.0-rc3+ >From testcase_run.info, we can see that inotify_init1 has been called for 240 iterations(0-239), and the 239th iteration failed(return EMFILE error), meanwhile from dmesg.info, we can also see that kernel function inotify_new_group() was called for 240 iterations, and the last iteration failed(exceed the 128 limits). From test results, I think when I ran inotify06, at least for the period inotify06 ran, there is no other process calling inotify_init1(), so it's not likely a userspace setup issue. Also from demes.info, you can see that every time inotify_new_group() was called, group->inotify_data.user->inotify_devs is not always 0. so whether close(inotify_fd) could not make number of inotify instances dropped as soon as the last descriptor pointing to the instance is closed? Thanks. Regards, Xiaoguang Wang > > Honza > -------------- next part -------------- inotify_init1 called 0 inotify_init1 called 1 inotify_init1 called 2 inotify_init1 called 3 inotify_init1 called 4 inotify_init1 called 5 inotify_init1 called 6 inotify_init1 called 7 inotify_init1 called 8 inotify_init1 called 9 inotify_init1 called 10 inotify_init1 called 11 inotify_init1 called 12 inotify_init1 called 13 inotify_init1 called 14 inotify_init1 called 15 inotify_init1 called 16 inotify_init1 called 17 inotify_init1 called 18 inotify_init1 called 19 inotify_init1 called 20 inotify_init1 called 21 inotify_init1 called 22 inotify_init1 called 23 inotify_init1 called 24 inotify_init1 called 25 inotify_init1 called 26 inotify_init1 called 27 inotify_init1 called 28 inotify_init1 called 29 inotify_init1 called 30 inotify_init1 called 31 inotify_init1 called 32 inotify_init1 called 33 inotify_init1 called 34 inotify_init1 called 35 inotify_init1 called 36 inotify_init1 called 37 inotify_init1 called 38 inotify_init1 called 39 inotify_init1 called 40 inotify_init1 called 41 inotify_init1 called 42 inotify_init1 called 43 inotify_init1 called 44 inotify_init1 called 45 inotify_init1 called 46 inotify_init1 called 47 inotify_init1 called 48 inotify_init1 called 49 inotify_init1 called 50 inotify_init1 called 51 inotify_init1 called 52 inotify_init1 called 53 inotify_init1 called 54 inotify_init1 called 55 inotify_init1 called 56 inotify_init1 called 57 inotify_init1 called 58 inotify_init1 called 59 inotify_init1 called 60 inotify_init1 called 61 inotify_init1 called 62 inotify_init1 called 63 inotify_init1 called 64 inotify_init1 called 65 inotify_init1 called 66 inotify_init1 called 67 inotify_init1 called 68 inotify_init1 called 69 inotify_init1 called 70 inotify_init1 called 71 inotify_init1 called 72 inotify_init1 called 73 inotify_init1 called 74 inotify_init1 called 75 inotify_init1 called 76 inotify_init1 called 77 inotify_init1 called 78 inotify_init1 called 79 inotify_init1 called 80 inotify_init1 called 81 inotify_init1 called 82 inotify_init1 called 83 inotify_init1 called 84 inotify_init1 called 85 inotify_init1 called 86 inotify_init1 called 87 inotify_init1 called 88 inotify_init1 called 89 inotify_init1 called 90 inotify_init1 called 91 inotify_init1 called 92 inotify_init1 called 93 inotify_init1 called 94 inotify_init1 called 95 inotify_init1 called 96 inotify_init1 called 97 inotify_init1 called 98 inotify_init1 called 99 inotify_init1 called 100 inotify_init1 called 101 inotify_init1 called 102 inotify_init1 called 103 inotify_init1 called 104 inotify_init1 called 105 inotify_init1 called 106 inotify_init1 called 107 inotify_init1 called 108 inotify_init1 called 109 inotify_init1 called 110 inotify_init1 called 111 inotify_init1 called 112 inotify_init1 called 113 inotify_init1 called 114 inotify_init1 called 115 inotify_init1 called 116 inotify_init1 called 117 inotify_init1 called 118 inotify_init1 called 119 inotify_init1 called 120 inotify_init1 called 121 inotify_init1 called 122 inotify_init1 called 123 inotify_init1 called 124 inotify_init1 called 125 inotify_init1 called 126 inotify_init1 called 127 inotify_init1 called 128 inotify_init1 called 129 inotify_init1 called 130 inotify_init1 called 131 inotify_init1 called 132 inotify_init1 called 133 inotify_init1 called 134 inotify_init1 called 135 inotify_init1 called 136 inotify_init1 called 137 inotify_init1 called 138 inotify_init1 called 139 inotify_init1 called 140 inotify_init1 called 141 inotify_init1 called 142 inotify_init1 called 143 inotify_init1 called 144 inotify_init1 called 145 inotify_init1 called 146 inotify_init1 called 147 inotify_init1 called 148 inotify_init1 called 149 inotify_init1 called 150 inotify_init1 called 151 inotify_init1 called 152 inotify_init1 called 153 inotify_init1 called 154 inotify_init1 called 155 inotify_init1 called 156 inotify_init1 called 157 inotify_init1 called 158 inotify_init1 called 159 inotify_init1 called 160 inotify_init1 called 161 inotify_init1 called 162 inotify_init1 called 163 inotify_init1 called 164 inotify_init1 called 165 inotify_init1 called 166 inotify_init1 called 167 inotify_init1 called 168 inotify_init1 called 169 inotify_init1 called 170 inotify_init1 called 171 inotify_init1 called 172 inotify_init1 called 173 inotify_init1 called 174 inotify_init1 called 175 inotify_init1 called 176 inotify_init1 called 177 inotify_init1 called 178 inotify_init1 called 179 inotify_init1 called 180 inotify_init1 called 181 inotify_init1 called 182 inotify_init1 called 183 inotify_init1 called 184 inotify_init1 called 185 inotify_init1 called 186 inotify_init1 called 187 inotify_init1 called 188 inotify_init1 called 189 inotify_init1 called 190 inotify_init1 called 191 inotify_init1 called 192 inotify_init1 called 193 inotify_init1 called 194 inotify_init1 called 195 inotify_init1 called 196 inotify_init1 called 197 inotify_init1 called 198 inotify_init1 called 199 inotify_init1 called 200 inotify_init1 called 201 inotify_init1 called 202 inotify_init1 called 203 inotify_init1 called 204 inotify_init1 called 205 inotify_init1 called 206 inotify_init1 called 207 inotify_init1 called 208 inotify_init1 called 209 inotify_init1 called 210 inotify_init1 called 211 inotify_init1 called 212 inotify_init1 called 213 inotify_init1 called 214 inotify_init1 called 215 inotify_init1 called 216 inotify_init1 called 217 inotify_init1 called 218 inotify_init1 called 219 inotify_init1 called 220 inotify_init1 called 221 inotify_init1 called 222 inotify_init1 called 223 inotify_init1 called 224 inotify_init1 called 225 inotify_init1 called 226 inotify_init1 called 227 inotify_init1 called 228 inotify_init1 called 229 inotify_init1 called 230 inotify_init1 called 231 inotify_init1 called 232 inotify_init1 called 233 inotify_init1 called 234 inotify_init1 called 235 inotify_init1 called 236 inotify_init1 called 237 inotify_init1 called 238 inotify_init1 called 239 inotify06 1 TBROK : inotify06.c:105: inotify_init failed: errno=EMFILE(24): Too many open files inotify06 2 TBROK : inotify06.c:105: Remaining cases broken inotify06 1 TBROK : safe_macros.c:370: inotify06.c:96: unlink(fname_1) failed: errno=ENOENT(2): No such file or directory inotify06 2 TBROK : safe_macros.c:370: Remaining cases broken -------------- next part -------------- [ 1008.337077] lege inotify_new_group ffff88007498b880 0 [ 1008.337334] lege inotify_new_group ffff88007498b880 1 [ 1008.337351] lege inotify_new_group ffff88007498b880 2 [ 1008.337377] lege inotify_new_group ffff88007498b880 3 [ 1008.337394] lege inotify_new_group ffff88007498b880 4 [ 1008.337408] lege inotify_new_group ffff88007498b880 5 [ 1008.337422] lege inotify_new_group ffff88007498b880 6 [ 1008.337436] lege inotify_new_group ffff88007498b880 7 [ 1008.337462] lege inotify_new_group ffff88007498b880 8 [ 1008.337479] lege inotify_new_group ffff88007498b880 9 [ 1008.337506] lege inotify_new_group ffff88007498b880 10 [ 1008.337522] lege inotify_new_group ffff88007498b880 11 [ 1008.337549] lege inotify_new_group ffff88007498b880 12 [ 1008.337580] lege inotify_new_group ffff88007498b880 13 [ 1008.337595] lege inotify_new_group ffff88007498b880 14 [ 1008.337620] lege inotify_new_group ffff88007498b880 15 [ 1008.337687] lege inotify_new_group ffff88007498b880 16 [ 1008.337771] lege inotify_new_group ffff88007498b880 16 [ 1008.337786] lege inotify_new_group ffff88007498b880 17 [ 1008.337799] lege inotify_new_group ffff88007498b880 18 [ 1008.337811] lege inotify_new_group ffff88007498b880 19 [ 1008.337823] lege inotify_new_group ffff88007498b880 20 [ 1008.337837] lege inotify_new_group ffff88007498b880 21 [ 1008.337849] lege inotify_new_group ffff88007498b880 22 [ 1008.337897] lege inotify_new_group ffff88007498b880 23 [ 1008.337914] lege inotify_new_group ffff88007498b880 24 [ 1008.337927] lege inotify_new_group ffff88007498b880 25 [ 1008.337941] lege inotify_new_group ffff88007498b880 26 [ 1008.337954] lege inotify_new_group ffff88007498b880 27 [ 1008.337979] lege inotify_new_group ffff88007498b880 28 [ 1008.337994] lege inotify_new_group ffff88007498b880 29 [ 1008.338009] lege inotify_new_group ffff88007498b880 30 [ 1008.338025] lege inotify_new_group ffff88007498b880 31 [ 1008.338040] lege inotify_new_group ffff88007498b880 32 [ 1008.338055] lege inotify_new_group ffff88007498b880 33 [ 1008.338070] lege inotify_new_group ffff88007498b880 34 [ 1008.338087] lege inotify_new_group ffff88007498b880 35 [ 1008.338106] lege inotify_new_group ffff88007498b880 36 [ 1008.338123] lege inotify_new_group ffff88007498b880 37 [ 1008.338137] lege inotify_new_group ffff88007498b880 38 [ 1008.338150] lege inotify_new_group ffff88007498b880 39 [ 1008.338162] lege inotify_new_group ffff88007498b880 40 [ 1008.338172] lege inotify_new_group ffff88007498b880 40 [ 1008.338182] lege inotify_new_group ffff88007498b880 40 [ 1008.338192] lege inotify_new_group ffff88007498b880 40 [ 1008.338201] lege inotify_new_group ffff88007498b880 40 [ 1008.338211] lege inotify_new_group ffff88007498b880 40 [ 1008.338221] lege inotify_new_group ffff88007498b880 40 [ 1008.338231] lege inotify_new_group ffff88007498b880 40 [ 1008.338241] lege inotify_new_group ffff88007498b880 40 [ 1008.338253] lege inotify_new_group ffff88007498b880 41 [ 1008.338264] lege inotify_new_group ffff88007498b880 42 [ 1008.338276] lege inotify_new_group ffff88007498b880 43 [ 1008.338288] lege inotify_new_group ffff88007498b880 44 [ 1008.338299] lege inotify_new_group ffff88007498b880 45 [ 1008.338311] lege inotify_new_group ffff88007498b880 46 [ 1008.338323] lege inotify_new_group ffff88007498b880 47 [ 1008.338336] lege inotify_new_group ffff88007498b880 48 [ 1008.338348] lege inotify_new_group ffff88007498b880 49 [ 1008.338361] lege inotify_new_group ffff88007498b880 50 [ 1008.338373] lege inotify_new_group ffff88007498b880 51 [ 1008.338387] lege inotify_new_group ffff88007498b880 52 [ 1008.338400] lege inotify_new_group ffff88007498b880 53 [ 1008.338414] lege inotify_new_group ffff88007498b880 54 [ 1008.338428] lege inotify_new_group ffff88007498b880 55 [ 1008.338450] lege inotify_new_group ffff88007498b880 56 [ 1008.338464] lege inotify_new_group ffff88007498b880 57 [ 1008.338479] lege inotify_new_group ffff88007498b880 58 [ 1008.338495] lege inotify_new_group ffff88007498b880 59 [ 1008.338512] lege inotify_new_group ffff88007498b880 60 [ 1008.338527] lege inotify_new_group ffff88007498b880 61 [ 1008.338542] lege inotify_new_group ffff88007498b880 62 [ 1008.338560] lege inotify_new_group ffff88007498b880 63 [ 1008.338576] lege inotify_new_group ffff88007498b880 64 [ 1008.338593] lege inotify_new_group ffff88007498b880 65 [ 1008.338606] lege inotify_new_group ffff88007498b880 66 [ 1008.338618] lege inotify_new_group ffff88007498b880 67 [ 1008.338628] lege inotify_new_group ffff88007498b880 67 [ 1008.338637] lege inotify_new_group ffff88007498b880 67 [ 1008.338648] lege inotify_new_group ffff88007498b880 67 [ 1008.338659] lege inotify_new_group ffff88007498b880 67 [ 1008.338669] lege inotify_new_group ffff88007498b880 67 [ 1008.338678] lege inotify_new_group ffff88007498b880 67 [ 1008.338688] lege inotify_new_group ffff88007498b880 67 [ 1008.338698] lege inotify_new_group ffff88007498b880 67 [ 1008.338710] lege inotify_new_group ffff88007498b880 68 [ 1008.338722] lege inotify_new_group ffff88007498b880 69 [ 1008.338733] lege inotify_new_group ffff88007498b880 70 [ 1008.338745] lege inotify_new_group ffff88007498b880 71 [ 1008.338758] lege inotify_new_group ffff88007498b880 72 [ 1008.338770] lege inotify_new_group ffff88007498b880 73 [ 1008.338785] lege inotify_new_group ffff88007498b880 74 [ 1008.338798] lege inotify_new_group ffff88007498b880 75 [ 1008.338812] lege inotify_new_group ffff88007498b880 76 [ 1008.338825] lege inotify_new_group ffff88007498b880 77 [ 1008.338838] lege inotify_new_group ffff88007498b880 78 [ 1008.338852] lege inotify_new_group ffff88007498b880 79 [ 1008.338888] lege inotify_new_group ffff88007498b880 80 [ 1008.338904] lege inotify_new_group ffff88007498b880 81 [ 1008.338918] lege inotify_new_group ffff88007498b880 82 [ 1008.338933] lege inotify_new_group ffff88007498b880 83 [ 1008.338950] lege inotify_new_group ffff88007498b880 84 [ 1008.338977] lege inotify_new_group ffff88007498b880 85 [ 1008.338993] lege inotify_new_group ffff88007498b880 86 [ 1008.339009] lege inotify_new_group ffff88007498b880 87 [ 1008.339024] lege inotify_new_group ffff88007498b880 88 [ 1008.339042] lege inotify_new_group ffff88007498b880 89 [ 1008.339058] lege inotify_new_group ffff88007498b880 90 [ 1008.339072] lege inotify_new_group ffff88007498b880 91 [ 1008.339085] lege inotify_new_group ffff88007498b880 92 [ 1008.339096] lege inotify_new_group ffff88007498b880 93 [ 1008.339155] lege inotify_new_group ffff88007498b880 94 [ 1008.352021] lege inotify_new_group ffff88007498b880 1 [ 1008.352046] lege inotify_new_group ffff88007498b880 2 [ 1008.352063] lege inotify_new_group ffff88007498b880 3 [ 1008.352079] lege inotify_new_group ffff88007498b880 4 [ 1008.352094] lege inotify_new_group ffff88007498b880 5 [ 1008.352110] lege inotify_new_group ffff88007498b880 6 [ 1008.352124] lege inotify_new_group ffff88007498b880 7 [ 1008.352139] lege inotify_new_group ffff88007498b880 8 [ 1008.352154] lege inotify_new_group ffff88007498b880 9 [ 1008.352170] lege inotify_new_group ffff88007498b880 10 [ 1008.352185] lege inotify_new_group ffff88007498b880 11 [ 1008.352201] lege inotify_new_group ffff88007498b880 12 [ 1008.352216] lege inotify_new_group ffff88007498b880 13 [ 1008.352231] lege inotify_new_group ffff88007498b880 14 [ 1008.352246] lege inotify_new_group ffff88007498b880 15 [ 1008.352261] lege inotify_new_group ffff88007498b880 16 [ 1008.352277] lege inotify_new_group ffff88007498b880 17 [ 1008.352292] lege inotify_new_group ffff88007498b880 18 [ 1008.352307] lege inotify_new_group ffff88007498b880 19 [ 1008.352321] lege inotify_new_group ffff88007498b880 20 [ 1008.352336] lege inotify_new_group ffff88007498b880 21 [ 1008.352351] lege inotify_new_group ffff88007498b880 22 [ 1008.352365] lege inotify_new_group ffff88007498b880 23 [ 1008.352380] lege inotify_new_group ffff88007498b880 24 [ 1008.352396] lege inotify_new_group ffff88007498b880 25 [ 1008.352410] lege inotify_new_group ffff88007498b880 26 [ 1008.352426] lege inotify_new_group ffff88007498b880 27 [ 1008.352440] lege inotify_new_group ffff88007498b880 28 [ 1008.352455] lege inotify_new_group ffff88007498b880 29 [ 1008.352470] lege inotify_new_group ffff88007498b880 30 [ 1008.352484] lege inotify_new_group ffff88007498b880 31 [ 1008.352499] lege inotify_new_group ffff88007498b880 32 [ 1008.352514] lege inotify_new_group ffff88007498b880 33 [ 1008.352529] lege inotify_new_group ffff88007498b880 34 [ 1008.352544] lege inotify_new_group ffff88007498b880 35 [ 1008.352560] lege inotify_new_group ffff88007498b880 36 [ 1008.352575] lege inotify_new_group ffff88007498b880 37 [ 1008.352591] lege inotify_new_group ffff88007498b880 38 [ 1008.352606] lege inotify_new_group ffff88007498b880 39 [ 1008.352620] lege inotify_new_group ffff88007498b880 40 [ 1008.352636] lege inotify_new_group ffff88007498b880 41 [ 1008.352651] lege inotify_new_group ffff88007498b880 42 [ 1008.352667] lege inotify_new_group ffff88007498b880 43 [ 1008.352682] lege inotify_new_group ffff88007498b880 44 [ 1008.352696] lege inotify_new_group ffff88007498b880 45 [ 1008.352712] lege inotify_new_group ffff88007498b880 46 [ 1008.352728] lege inotify_new_group ffff88007498b880 47 [ 1008.352742] lege inotify_new_group ffff88007498b880 48 [ 1008.352757] lege inotify_new_group ffff88007498b880 49 [ 1008.352772] lege inotify_new_group ffff88007498b880 50 [ 1008.352787] lege inotify_new_group ffff88007498b880 51 [ 1008.352802] lege inotify_new_group ffff88007498b880 52 [ 1008.352817] lege inotify_new_group ffff88007498b880 53 [ 1008.352832] lege inotify_new_group ffff88007498b880 54 [ 1008.352848] lege inotify_new_group ffff88007498b880 55 [ 1008.352903] lege inotify_new_group ffff88007498b880 56 [ 1008.352927] lege inotify_new_group ffff88007498b880 57 [ 1008.352942] lege inotify_new_group ffff88007498b880 58 [ 1008.352989] lege inotify_new_group ffff88007498b880 59 [ 1008.353012] lege inotify_new_group ffff88007498b880 60 [ 1008.353034] lege inotify_new_group ffff88007498b880 61 [ 1008.353042] lege inotify_new_group ffff88007498b880 62 [ 1008.353049] lege inotify_new_group ffff88007498b880 63 [ 1008.353056] lege inotify_new_group ffff88007498b880 64 [ 1008.353063] lege inotify_new_group ffff88007498b880 65 [ 1008.353070] lege inotify_new_group ffff88007498b880 66 [ 1008.353078] lege inotify_new_group ffff88007498b880 67 [ 1008.353085] lege inotify_new_group ffff88007498b880 68 [ 1008.353092] lege inotify_new_group ffff88007498b880 69 [ 1008.353101] lege inotify_new_group 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