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[69.159.39.167]) by smtp.gmail.com with ESMTPSA id k22sm20409152iom.45.2019.09.13.11.37.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Sep 2019 11:37:20 -0700 (PDT) Sender: Mark Johnston Date: Fri, 13 Sep 2019 14:37:18 -0400 From: Mark Johnston To: Ryan Stone Cc: Mariusz Zaborski , FreeBSD Current Subject: Re: Deadlock involving truss -f, pdfork() and wait4() Message-ID: <20190913183718.GC84156@raichu> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) X-Rspamd-Queue-Id: 46VPWQ6T1jz3yl3 X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=bSzODw+d; dmarc=none; spf=pass (mx1.freebsd.org: domain of markjdb@gmail.com designates 2607:f8b0:4864:20::d30 as permitted sender) smtp.mailfrom=markjdb@gmail.com X-Spamd-Result: default: False [-3.73 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36:c]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; DMARC_NA(0.00)[freebsd.org]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; RCVD_IN_DNSWL_NONE(0.00)[0.3.d.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; IP_SCORE(-2.03)[ip: (-5.17), ipnet: 2607:f8b0::/32(-2.71), asn: 15169(-2.24), country: US(-0.05)]; FORGED_SENDER(0.30)[markj@freebsd.org,markjdb@gmail.com]; FREEMAIL_TO(0.00)[gmail.com]; MID_RHS_NOT_FQDN(0.50)[]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; FROM_NEQ_ENVFROM(0.00)[markj@freebsd.org,markjdb@gmail.com]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Sep 2019 18:37:23 -0000 On Fri, Sep 13, 2019 at 02:12:56PM -0400, Ryan Stone wrote: > This gets me a little further but now the wait4 call by the parent > never reaps the child and instead blocks forever: Does it perform a wildcarded wait(), or does it explicitly specify the PID of the child? By design, the former will not return children created by pdfork().