Path: csiph.com!3.us.feeder.erje.net!feeder.erje.net!news.snarked.org!news.linkpendium.com!news.linkpendium.com!panix!usenet.stanford.edu!not-for-mail From: Chet Ramey Newsgroups: gnu.bash.bug Subject: Re: Segfault on recursive trap/kill Date: Sat, 6 Oct 2018 12:33:22 -0400 Organization: ITS, Case Western Reserve University Lines: 22 Approved: bug-bash@gnu.org Message-ID: References: <8736tj3llu.fsf@gnu.org> Reply-To: chet.ramey@case.edu NNTP-Posting-Host: lists.gnu.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: usenet.stanford.edu 1538843614 18775 208.118.235.17 (6 Oct 2018 16:33:34 GMT) X-Complaints-To: action@cs.stanford.edu Cc: chet.ramey@case.edu To: Mike Gerwitz , bug-bash@gnu.org Envelope-to: bug-bash@gnu.org X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:reply-to:cc:subject:to:references:from:openpgp :autocrypt:organization:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; 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Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 In-Reply-To: <8736tj3llu.fsf@gnu.org> Content-Language: en-US X-Junkmail-Premium-Raw: score=7/90, refid=2.7.2:2018.10.5.210616:17:7.944, ip=, rules=__YOUTUBE_RCVD, __X_GOOGLE_DKIM_SIGNATURE, __HAS_REPLYTO, __HAS_CC_HDR, __SUBJ_REPLY, __BOUNCE_CHALLENGE_SUBJ, __BOUNCE_NDR_SUBJ_EXEMPT, __TO_MALFORMED_2, __TO_NAME, __TO_NAME_DIFF_FROM_ACC, __REFERENCES, __HAS_FROM, FROM_EDU_TLD, __HAS_MSGID, __SANE_MSGID, DATE_TZ_NA, __USER_AGENT, __MOZILLA_USER_AGENT, __MIME_VERSION, __IN_REP_TO, __CT, __CT_TEXT_PLAIN, __CTE, __REPLYTO_SAMEAS_FROM_ADDY, __REPLYTO_SAMEAS_FROM_ACC, __FROM_DOMAIN_IN_ANY_CC1, __FROM_DOMAIN_IN_ANY_CC2, __REPLYTO_SAMEAS_FROM_DOMAIN, __ANY_URI, __URI_WITH_PATH, __URI_NO_WWW, __CP_URI_IN_BODY, __FRAUD_MONEY_CURRENCY_DOLLAR, __SUBJ_ALPHA_NEGATE, __URI_IN_BODY, __URI_NOT_IMG, __FORWARDED_MSG, __NO_HTML_TAG_RAW, BODYTEXTP_SIZE_3000_LESS, BODY_SIZE_800_899, __MIME_TEXT_P1, __MIME_TEXT_ONLY, __URI_NS, HTML_00_01, HTML_00_10, __FRAUD_MONEY_CURRENCY, BODY_SIZE_5000_LESS, IN_REP_TO, MSG_THREAD, [TRUNCATED] X-Junkmail-Status: score=10/90, host=mpv2-2015.case.edu X-Junkmail-Signature-Raw: score=unknown, refid=str=0001.0A020202.5BB8E3D5.0058,ss=1,re=0.000,fgs=0, ip=174.131.57.47, so=2016-11-06 16:00:04, dmn=2011-05-27 18:58:46, mode=multiengine X-Junkmail-IWF: false X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020202.5BB8E3D5.0058,ss=1,re=0.000,fgs=0, ip=174.131.57.47, so=2016-11-06 16:00:04, dmn=2011-05-27 18:58:46 X-Mirapoint-Loop-Id: da4cc3ca0857767c697bd36ffd646682 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] X-Received-From: 129.22.103.227 X-BeenThere: bug-bash@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Bug reports for the GNU Bourne Again SHell List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Xref: csiph.com gnu.bash.bug:14689 On 10/5/18 9:33 PM, Mike Gerwitz wrote: > The following code will cause a segfault on bash-4.4.19(1) on > GNU Guix. I reproduced the issue on an old Ubuntu 14.04 LTS running > bash-4.3.11(1) as well as a Trisquel system running the same version. > > bash -c 'trap "kill 0" TERM; kill 0' > > Also segfaults when replacing `0' with `$$', and presumably in any other > situation that would trigger the trap recursively. Yes. Bash has allowed recursive trap handlers since early 2014 (pre-4.3) due to requests for the feature and compatibility with other shells that allow it. If you manage to create infinite recursion, bash won't stop you. Chet -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/