From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3vS8LS3vDkzDqGx for ; Tue, 21 Feb 2017 16:33:52 +1100 (AEDT) From: Michael Ellerman To: "Guilherme G. Piccoli" , linuxppc-dev@lists.ozlabs.org Cc: gpiccoli@linux.vnet.ibm.com, paulus@samba.org, npiggin@gmail.com, xinhui.pan@linux.vnet.ibm.com Subject: Re: [PATCH 2/3] powerpc/xmon: drop the nobt option from xmon plus minor fixes In-Reply-To: <87poicm8cw.fsf@concordia.ellerman.id.au> References: <1487290677-7200-1-git-send-email-gpiccoli@linux.vnet.ibm.com> <1487290677-7200-3-git-send-email-gpiccoli@linux.vnet.ibm.com> <87poicm8cw.fsf@concordia.ellerman.id.au> Date: Tue, 21 Feb 2017 16:33:52 +1100 Message-ID: <87k28km7jz.fsf@concordia.ellerman.id.au> MIME-Version: 1.0 Content-Type: text/plain List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Michael Ellerman writes: > "Guilherme G. Piccoli" writes: ... > > Imagine you're debugging a machine and you drop into xmon to check > something, then drop out again. > > Then you go away and leave the box, and it crashes into xmon, but xmon > doesn't print a backtrace because you've already been in xmon. Usually > you can just get on the console and hit 't', but sometimes the machine > crashes so hard that xmon doesn't take input - in which case you now > have no backtrace. :sadface: OK I read your patch wrong, the above won't happen. But I still don't think we need any of the auto back trace suppression. cheers