From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail191.messagelabs.com (mail191.messagelabs.com [216.82.242.19]) by kanga.kvack.org (Postfix) with SMTP id A61766B00AE for ; Fri, 7 Jan 2011 08:05:58 -0500 (EST) Received: by iyj17 with SMTP id 17so16967272iyj.14 for ; Fri, 07 Jan 2011 05:05:57 -0800 (PST) MIME-Version: 1.0 In-Reply-To: References: <20101122154754.e022d935.akpm@linux-foundation.org> <20101129152500.000c380b.akpm@linux-foundation.org> Date: Fri, 7 Jan 2011 14:05:57 +0100 Message-ID: Subject: Re: kernel BUG at /build/buildd/linux-2.6.35/mm/filemap.c:128! From: =?UTF-8?B?Um9iZXJ0IMWad2nEmWNraQ==?= Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org To: Hugh Dickins Cc: Miklos Szeredi , Andrew Morton , Nick Piggin , linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Fri, Jan 7, 2011 at 2:02 PM, Robert =C5=9Awi=C4=99cki wrote: > =C2=A0but will be happy if someone else beats me to it. >>> >>> I have since found an omission in the restart_addr logic: looking back >>> at the October 2004 history of vm_truncate_count, I see that originally >>> I designed it to work one way, but hurriedly added a 7/6 redesign when >>> vma splitting turned out to leave an ambiguity. =C2=A0I should have upd= ated >>> the protection in mremap move at that time, but missed it. >>> >>> Robert, please try out the patch below (should apply fine to 2.6.35): >> >> In the beginning =C2=A0of Jan (3-4) at earliest I'm afraid, i.e. when I >> manage to get to my console-over-rs232 setup. > > I cannot reproduce it even with the unpatched kernel, cause I get the > following oops (3 times out of 3 tries) relatively quickly. Still > trying. > > Entering kdb (current=3D0xffff88006b525ac0, pid 12468) on processor 1 Oop= s: (null) > due to oops @ 0xffffffff810c2a1b > CPU 1 > Pid: 12468, comm: iknowthis Not tainted 2.6.37-rc2 #1 Hm.. wrong kernel, trying now with 2.6.35 - anyway this proc readdir oops appears also on 2.6.35 > 0GH911/Precision WorkStation 390 > RIP: 0010:[] =C2=A0[] next_pidmap+= 0x4b/0xa0 > RSP: 0000:ffff88006bc6fd78 =C2=A0EFLAGS: 00010206 > RAX: 001ffffffffd2010 RBX: 001fffff829eee38 RCX: 0000000000000034 > RDX: 0000000000001bd7 RSI: 00000000e9009bd6 RDI: ffffffff82a1ce20 > RBP: ffff88006bc6fd98 R08: c000000000000000 R09: 4fb0000000000000 > R10: 7d80000000000000 R11: 0000000000000000 R12: ffffffff82a1d628 > R13: ffffffff82a1ce20 R14: ffff880123768000 R15: ffffffff811d98e0 > FS: =C2=A00000000000000000(0000) GS:ffff8800cfc40000(0063) knlGS:00000= 000f74aa6c0 > CS: =C2=A00010 DS: 002b ES: 002b CR0: 000000008005003b > CR2: 000000000808865c CR3: 000000011b1a4000 CR4: 00000000000006e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Process iknowthis (pid: 12468, threadinfo ffff88006bc6e000, task > ffff88006b525ac0) > <0>Stack: > ffff88006bc6fe78 00000000e9009bd6 0000000000000000 > ffffffff82a1ce20 > ffff88006bc6fdc8 ffffffff810c2aac ffff880018cfc410 > ffffffff82a1ce20 > 00000000e9009bd6 ffffffff811d98e0 ffff88006bc6fe28 > ffffffff811f3dab > <0>Call Trace: > [1]more> > Only 'q' or 'Q' are processed at more prompt, input ignored > <0> [] find_ge_pid+0x3c/0x50 > <0> [] ? compat_fillonedir+0x0/0xe0 > <0> [] next_tgid+0x3b/0xc0 > <0> [] ? compat_fillonedir+0x0/0xe0 > <0> [] proc_pid_readdir+0x13c/0x1d0 > <0> [] ? compat_fillonedir+0x0/0xe0 > <0> [] proc_root_readdir+0x4a/0x60 > <0> [] ? compat_fillonedir+0x0/0xe0 > <0> [] vfs_readdir+0xc0/0xe0 > <0> [] compat_sys_old_readdir+0x45/0x70 > <0> [] ia32_sysret+0x0/0x5 > <0>Code: 89 fd 48 c1 e8 0f 48 c1 e0 04 48 8d 5c 07 08 4c 39 e3 73 54 > 81 e2 ff 7f 00 00 eb 0f eb 02 90 90 48 83 c3 10 31 d2 49 39 dc 76 3d > <48> 8b 7b 08 48 85 ff 74 ec 48 63 d2 be 00 80 00 00 e8 6f a4 41 > Call Trace: > =C2=A0[] find_ge_pid+0x3c/0x50 > =C2=A0[] ? compat_fillonedir+0x0/0xe0 > =C2=A0[] next_tgid+0x3b/0xc0 > =C2=A0[] ? compat_fillonedir+0x0/0xe0 > =C2=A0[] proc_pid_readdir+0x13c/0x1d0 > =C2=A0[] ? compat_fillonedir+0x0/0xe0 > =C2=A0[] proc_root_readdir+0x4a/0x60 > =C2=A0[] ? compat_fillonedir+0x0/0xe0 > =C2=A0[] vfs_readdir+0xc0/0xe0 > [1]more> > Only 'q' or 'Q' are processed at more prompt, input ignored > =C2=A0[] compat_sys_old_readdir+0x45/0x70 > =C2=A0[] ia32_sysret+0x0/0x5 > > > > -- > Robert =C5=9Awi=C4=99cki > --=20 Robert =C5=9Awi=C4=99cki -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: email@kvack.org