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Subject: Re: GNU make losing jobserver tokens Content-Language: en-US To: cygwin@cygwin.com References: <9b9da583-124d-9d5f-4c10-6622602ca8dc@oracle.com> <20220401174551.820cbc148852554108397e03@nifty.ne.jp> <20220427231340.0bdab2d6d903dd4fb44bd12f@nifty.ne.jp> From: Ken Brown In-Reply-To: <20220427231340.0bdab2d6d903dd4fb44bd12f@nifty.ne.jp> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MN2PR10CA0031.namprd10.prod.outlook.com (2603:10b6:208:120::44) To BN7PR04MB4388.namprd04.prod.outlook.com (2603:10b6:406:f8::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: b29740f9-4f5e-4aec-5b4f-08da291cfbaa X-MS-TrafficTypeDiagnostic: SJ0PR04MB8248:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR04MB8248 X-Spam-Status: No, score=-9.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, NICE_REPLY_A, SPF_HELO_PASS, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Apr 2022 13:42:55 -0000 On 4/27/2022 10:13 AM, Takashi Yano wrote: > On Fri, 1 Apr 2022 17:45:51 +0900 > Takashi Yano wrote: >> I have tried to reproduce the issue by building OpenJDK >> from source, however, I could not. >> >> Instead, I encountered another issue. >> >> Building OpenJDK sometimes (rarely) failed with error such as: >> >> 0 [sig] make 5484 sig_send: error sending signal 11, pid 5484, pipe handle 0x118, nb 0, packsize 176, Win32 error 0 >> 124917 [main] make 5484 sig_send: error sending signal -72, pid 5484, pipe handle 0x118, nb 0, packsize 176, Win32 error 0 >> common/modules/GensrcModuleInfo.gmk:77: *** open: /home/yano/jdk/build/windows-x86-server-release/make-support/vardeps/make/common/modules/GensrcModuleInfo.gmk/jdk.accessibility/ALL_MODULES.vardeps: No such file or directory. Stop. >> make[2]: *** [make/Main.gmk:141: jdk.accessibility-gensrc-moduleinfo] Error 2 >> make[2]: *** Waiting for unfinished jobs.... >> >> >> I looked into this new problem and found that wait_sig() thread >> crashes with segfault. It seems that accessing _main_tls causes >> access violation if a signal is sent just after the process is >> started. >> >> static void WINAPI >> wait_sig (VOID *) >> { >> [...] >> if (!pack.mask) >> { >> tl_entry = cygheap->find_tls (_main_tls); >> dummy_mask = _main_tls->sigmask; // <--- Segfault here >> cygheap->unlock_tls (tl_entry); >> pack.mask = &dummy_mask; >> } >> >> I also found the following patch resolves the issue. >> >> diff --git a/winsup/cygwin/sigproc.cc b/winsup/cygwin/sigproc.cc >> index 62df96652..3824af199 100644 >> --- a/winsup/cygwin/sigproc.cc >> +++ b/winsup/cygwin/sigproc.cc >> @@ -1325,6 +1325,10 @@ wait_sig (VOID *) >> _sig_tls = &_my_tls; >> bool sig_held = false; >> >> + /* Wait for _main_tls initialization. */ >> + while (!cygwin_finished_initializing) >> + Sleep (10); >> + >> sigproc_printf ("entering ReadFile loop, my_readsig %p, my_sendsig %p", >> my_readsig, my_sendsig); >> >> >> I guess _main_tls may not be initialized correctly until >> cygwin_finished_initializing is set. >> >> Any comments would be appreciated. This seems reasonable to me. Ken