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From: Qian Cai <cai@lca.pw>
To: Esme <esploit@protonmail.ch>
Cc: "dgilbert@interlog.com" <dgilbert@interlog.com>,
	David Lechner <david@lechnology.com>,
	Michel Lespinasse <walken@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	"jejb@linux.ibm.com" <jejb@linux.ibm.com>,
	"martin.petersen@oracle.com" <martin.petersen@oracle.com>,
	"joeypabalinas@gmail.com" <joeypabalinas@gmail.com>,
	linux-mm <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2] rbtree: fix the red root
Date: Fri, 18 Jan 2019 12:10:43 -0500
Message-ID: <86889aee-2e9c-a686-cfe9-dde27249da53@lca.pw> (raw)
In-Reply-To: <V43yC74oVMPrFb5L6QvYmFx60e29_vCM12jAOjNpWyrsRbIkKjpDRS9uyMCAwOtLpoHKJkM1CVJ50oXG0n23vBvsAluprgSNas3aCeSP7rs=@protonmail.ch>



On 1/16/19 9:37 AM, Esme wrote:
> I have been off but back now, I had fetch'd current again and the diagnostics look a bit different, maybe I just got lucky.  Instead of fork'ng the test case (which is fairly aggressive in any case), interacting from the serial port with sig-int ^C tend's to trigger enough to hit something.  I'll get the page_owner sorted soon.
> 
> How I'm running;
> 
> qemu-system-x86_64 -kernel /home/files/dl/linux//arch/x86/boot/bzImage -append console=ttyS0 root=/dev/sda debug earlyprintk=serial slub_debug=QUZFP page_owner=on -hda stretch.img -net user,hostfwd=tcp::10021-:22 -net nic -enable-kvm -nographic -m 2G -smp 2
> 
> It's somewhat random I guess that in the last two CPU context dump's printed out, we see RAX and CR2 off by 4 from one another.
> 
> root@syzkaller:~# gcc -o test3 test3.c
> [  392.754148] ata1: lost interrupt (Status 0x50)
> [  392.754478] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
> [  392.759687] ata1.00: failed command: READ DMA
> [  392.761902] ata1.00: cmd c8/00:86:00:00:00/00:00:00:00:00/e0 tag 0 dma 68608 out
> [  392.761902]          res 40/00:01:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
> [  392.768541] ata1.00: status: { DRDY }
> [  392.769532] ata1: soft resetting link
> [  392.937942] ata1.00: configured for MWDMA2
> [  392.945624] ata1: EH complete

While you are gathering page_owner (or kdump), it might be useful to use virtio
storage driver instead of legacy IDE here, as looks like this ATA was busted.

      reply index

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <YrcPMrGmYbPe_xgNEV6Q0jqc5XuPYmL2AFSyeNmg1gW531bgZnBGfEUK5_ktqDBaNW37b-NP2VXvlliM7_PsBRhSfB649MaW1Ne7zT9lHc=@protonmail.ch>
2019-01-11 16:51 ` [PATCH] " Qian Cai
2019-01-11 17:17   ` Joey Pabalinas
2019-01-11 17:31   ` Matthew Wilcox
2019-01-11 17:53     ` Joey Pabalinas
2019-01-11 18:12     ` Qian Cai
2019-01-11 18:16       ` Matthew Wilcox
2019-01-11 20:58         ` [PATCH v2] " Qian Cai
2019-01-11 23:16           ` Matthew Wilcox
2019-01-12  0:18             ` Qian Cai
2019-01-12  0:39               ` Esme
2019-01-11 23:47           ` David Lechner
2019-01-12  2:58             ` Michel Lespinasse
2019-01-14  2:20               ` David Lechner
2019-01-14  2:33                 ` Qian Cai
2019-01-14  3:07                   ` Esme
2019-01-14  3:52                     ` Douglas Gilbert
2019-01-14  3:59                       ` Esme
2019-01-14  4:52                         ` Douglas Gilbert
2019-01-14  6:23                           ` Esme
2019-01-14 15:45                             ` Qian Cai
2019-01-14 15:51                               ` Esme
2019-01-14 17:58                                 ` Qian Cai
2019-01-14 18:26                                   ` Douglas Gilbert
2019-01-15  5:31                             ` Qian Cai
2019-01-16 14:37                               ` Esme
2019-01-18 17:10                                 ` Qian Cai [this message]

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