From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9D902C25B76 for ; Wed, 5 Jun 2024 09:15:14 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sEmiu-00059f-LV; Wed, 05 Jun 2024 05:14:24 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sEmis-00058y-Og for qemu-devel@nongnu.org; Wed, 05 Jun 2024 05:14:22 -0400 Received: from smtp-out1.suse.de ([2a07:de40:b251:101:10:150:64:1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1sEmir-0000Cb-5x for qemu-devel@nongnu.org; Wed, 05 Jun 2024 05:14:22 -0400 Received: from hawking.nue2.suse.org (unknown [10.168.4.11]) by smtp-out1.suse.de (Postfix) with ESMTP id DDCFB21A61 for ; Wed, 5 Jun 2024 09:14:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1717578858; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version:content-type:content-type; bh=vtGKSyUhtS72HIxxhvrZ+lqdKuFGY8Sfcp2iXxIUfEg=; b=VUp7c/YOjyh1OGc3XzM/VASfIUjuRixlborXU5qslueD8TdLVtIrBztI8JnEjg9YycU5zB bka6lGzyp+B2rzDHV0ILL4ATUNA6yexRqsy/Thqowv7AksBBtY73nHnU1OGvsbFQ2IjA0O jEIMVmqPCxwZYtwB/GGSPQ3ZClMrcoo= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1717578858; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version:content-type:content-type; bh=vtGKSyUhtS72HIxxhvrZ+lqdKuFGY8Sfcp2iXxIUfEg=; b=mrGBa8Vqn0YtMXn3HMiXZgH7g/n2pCfEJ0qkSFXdhbMEoOonzwolJLqC0Jpt8Trmo0X5KP uOOQGTjIqCXZKuAg== Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1717578857; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version:content-type:content-type; bh=vtGKSyUhtS72HIxxhvrZ+lqdKuFGY8Sfcp2iXxIUfEg=; b=u3pCR9DYa6T9kaX9zM7JxbwC17nYY2Dp+lLTjqdJgpqv+PK5aEX+s5qAiRESP39cCHS4Yd NYYc9WCIlYzbUqow2iKBoPnjkHpxqcj33o36R4XVstrm7bV62aRDcY0T2sojXRWHpglBKA hRKDwqSkJ4jJEYcrpZ4MX+7hMuWI+34= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1717578857; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version:content-type:content-type; bh=vtGKSyUhtS72HIxxhvrZ+lqdKuFGY8Sfcp2iXxIUfEg=; b=upIak1m5Y77mjvfTSAPh/tXrjRxn7XDeWgmKZKjh8jtD3MuicZNnw1ezFWPuN4irB8p+vA Yn8wOmrgq3SZ5fAQ== Received: by hawking.nue2.suse.org (Postfix, from userid 17005) id CF0114A0552; Wed, 5 Jun 2024 11:14:17 +0200 (CEST) From: Andreas Schwab To: qemu-devel@nongnu.org Subject: linux-user emulation hangs during fork X-Yow: Will this never-ending series of PLEASURABLE EVENTS never cease? Date: Wed, 05 Jun 2024 11:14:17 +0200 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spamd-Result: default: False [-4.19 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.19)[-0.974]; MIME_GOOD(-0.10)[text/plain]; RCVD_NO_TLS_LAST(0.10)[]; ARC_NA(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_ONE(0.00)[1]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_DN_NONE(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email] Received-SPF: pass client-ip=2a07:de40:b251:101:10:150:64:1; envelope-from=schwab@suse.de; helo=smtp-out1.suse.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org $ qemu-x86_64 --version qemu-x86_64 version 9.0.50 (v9.0.0-1211-gd16cab541a) Copyright (c) 2003-2024 Fabrice Bellard and the QEMU Project developers $ cat fork.rb begin r, w = IO.pipe if pid1 = fork w.close r.read 1 Process.kill "USR1", pid1 Process.wait2 pid1 else print "child\n" r.close if pid2 = fork trap("USR1") { print "child: kill\n"; Process.kill "USR2", pid2 } w.close print "child: wait\n" Process.wait2 pid2 else print "grandchild\n" w.close sleep 0.2 end end end $ ruby fork.rb child child: wait grandchild child: kill $ qemu-x86_64 /usr/bin/ruby fork.rb child child: wait ^Z [1]+ Stopped qemu-x86_64 /usr/bin/ruby fork.rb $ grep SigB $(for p in $(pidof qemu-x86_64); do echo /proc/$p/status; done | sort) /proc/3221/status:SigBlk: 0000000000000000 /proc/3224/status:SigBlk: 0000000000000000 /proc/3228/status:SigBlk: fffffff27ffbfa9f -- Andreas Schwab, SUSE Labs, schwab@suse.de GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different."