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Fri, 28 Apr 2023 04:25:43 -0700 (PDT) MIME-Version: 1.0 References: <886115150.3264962.1682430985767@mail.virginmedia.com> In-Reply-To: <886115150.3264962.1682430985767@mail.virginmedia.com> From: Sebastian Gniazdowski Date: Fri, 28 Apr 2023 11:25:17 +0000 Message-ID: Subject: Re: [BUG] sigsegv To: Peter Stephenson Cc: Zsh hackers list Content-Type: text/plain; charset="UTF-8" X-Seq: 51675 Archived-At: X-Loop: zsh-workers@zsh.org Errors-To: zsh-workers-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-workers-request@zsh.org X-no-archive: yes List-Id: List-Help: , List-Subscribe: , List-Unsubscribe: , List-Post: List-Owner: List-Archive: It looks like the last field is incorrect: (gdb) up #1 0x00007ffff7e1f628 in histwgetfn (pm=0x508e10) at parameter.c:1241 1241 addlinknode(l, dupstring(h)); (gdb) p *l->list->last Cannot access memory at address 0x7ffff5350068 On Tue, 25 Apr 2023 at 13:56, Peter Stephenson wrote: > > > On 25/04/2023 14:48 Sebastian Gniazdowski wrote: > > I have to say that current HEAD has many sigsegv errors, at least twp. > > The reported in this email is an older problem with alt-/ history > > complete, I've had it also with 5.8. I'm still waiting for the 5.9 > > only problem to occur, it's quite random and hard to reproduce. > > To trigger the error, press alt-/ some times. > > > > #0 0x0000000000457868 in insertlinknode (list=list@entry=0x7ffff7abe368, > > node=0x7ffff55600d8, dat=0x7ffff556e8f0) at linklist.c:137 > > #1 0x00007ffff7bed6bf in histwgetfn (pm=) at parameter.c:1241 > > The linked list management itself looks fairly harmless, but I wonder if there's > something in the immediately surrounding code that could be fishy and messing > up memory? > > for (iw = he->nwords - 1; iw >= 0; iw--) { > h = he->node.nam + he->words[iw * 2]; > e = he->node.nam + he->words[iw * 2 + 1]; > sav = *e; > *e = '\0'; > addlinknode(l, dupstring(h)); > *e = sav; > } > > Some testing of strlen(he->node.nam) might not come amiss? > > Of course this is total guesswork. > > pws > -- Best regards, Sebastian Gniazdowski