From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Noam Postavsky Newsgroups: gmane.emacs.bugs Subject: bug#30626: 26.0.91; Crash when traversing a `stream-of-directory-files' Date: Mon, 12 Mar 2018 21:59:57 -0400 Message-ID: <87lgewybtu.fsf@gmail.com> References: <87inaiss6l.fsf@web.de> <6FCF6ACA-4F29-4B6B-BE9D-D7130C6E9495@gnu.org> <87fu5moe4c.fsf@web.de> <877eqyocro.fsf@web.de> <83zi3uz4nb.fsf@gnu.org> <87lgfd52by.fsf@gmail.com> <87bmg91ity.fsf@web.de> <83h8q1yuin.fsf@gnu.org> <87po4pnl0a.fsf@web.de> <837eqxyqoe.fsf@gnu.org> <87lgfdnf86.fsf@web.de> <87muzs11hk.fsf@web.de> <87606e4lel.fsf@gmail.com> <87lgf83gun.fsf@gmail.com> <87fu5f3kcr.fsf@gmail.com> <83lgf7u644.fsf@gnu.org> <87bmfuzbq1.fsf@gmail.com> <83vae2s6b6.fsf@gnu.org> <876062z3fs.fsf@gmail.com> <83sh96rmzw.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1520906356 24096 195.159.176.226 (13 Mar 2018 01:59:16 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 13 Mar 2018 01:59:16 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.90 (gnu/linux) Cc: michael_heerdegen@web.de, john.b.mastro@gmail.com, nicolas@petton.fr, 30626@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Mar 13 02:59:11 2018 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1evZDa-0006Az-A4 for geb-bug-gnu-emacs@m.gmane.org; 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[45.2.119.34]) by smtp.googlemail.com with ESMTPSA id v133sm4344853itc.17.2018.03.12.18.59.58 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 12 Mar 2018 18:59:58 -0700 (PDT) In-Reply-To: <83sh96rmzw.fsf@gnu.org> (Eli Zaretskii's message of "Mon, 12 Mar 2018 05:28:19 +0200") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:144173 Archived-At: Eli Zaretskii writes: >> From: Noam Postavsky >> Cc: michael_heerdegen@web.de, john.b.mastro@gmail.com, nicolas@petton.fr, 30626@debbugs.gnu.org >> Date: Sun, 11 Mar 2018 17:51:19 -0400 >> >> > If you have the address, you could first find the stack frame to which >> > it belongs, right? >> >> Um, how do I do that part? > > By comparing the address with the value of $bp in each frame, I'd say. Hmm, I found a match, but it doesn't make any sense. #4851 0x0000000000611d4f in mark_vectorlike (ptr=0x2e64c90) at ../../src/alloc.c:6227 #4852 0x0000000000612b42 in mark_object (arg=XIL(0x2e64c95)) at ../../src/alloc.c:6624 #4853 0x000000000060f3ce in mark_maybe_pointer (p=0x2e64c90) at ../../src/alloc.c:4936 #4854 0x000000000060f452 in mark_memory (start=0x7fffffffa520, end=0x7fffffffe868) at ../../src/alloc.c:4985 #4855 0x000000000060f493 in mark_stack (bottom=0x7fffffffe868 "a\036h\364\377\177", end=0x7fffffffa520 "0\245\377\377\377\177") at ../../src/alloc.c:5193 (gdb) frame 4854 #4854 0x000000000060f452 in mark_memory (start=0x7fffffffa520, end=0x7fffffffe868) at ../../src/alloc.c:4985 4985 mark_maybe_pointer (*(void **) pp); (gdb) p pp $28 = 0x7fffffffa968 "\220L\346\002" (gdb) frame 4864 #4864 0x000000000068d950 in exec_byte_code (bytestr=XIL(0x2e7aad4), vector=XIL(0x2e72715), maxdepth=make_number(18), args_template=make_number(768), nargs=3, args=0x7fffffffad20) at ../../src/bytecode.c:632 632 TOP = Ffuncall (op + 1, &TOP); (gdb) p $rbp $29 = (void *) 0x7fffffffabd0 (gdb) p/x $rbp - $28 $32 = 0x268 (gdb) disas /s [...] 1180 CASE (Bbuffer_substring): 1181 { 1182 Lisp_Object v1 = POP; 0x000000000068fea4 <+13154>: mov -0x40(%rbp),%rax 0x000000000068fea8 <+13158>: lea -0x8(%rax),%rdx 0x000000000068feac <+13162>: mov %rdx,-0x40(%rbp) 0x000000000068feb0 <+13166>: mov (%rax),%rax 0x000000000068feb3 <+13169>: mov %rax,-0x268(%rbp) 1183 TOP = Fbuffer_substring (TOP, v1); 0x000000000068feba <+13176>: mov -0x268(%rbp),%rdx 0x000000000068fec1 <+13183>: mov -0x40(%rbp),%rax 0x000000000068fec5 <+13187>: mov %rdx,%rsi 0x000000000068fec8 <+13190>: mov (%rax),%rdi 0x000000000068fecb <+13193>: callq 0x627e0a It can't be a buffer-substring arg, but that's the only reference to -0x268(%rbp) in that function.