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Date: Mon, 25 Mar 2013 12:37:03 -0400
From: Dave Jones <davej@...hat.com>
To: Peter Hurley <peter@...leysoftware.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Linux Kernel <linux-kernel@...r.kernel.org>,
Al Viro <viro@...iv.linux.org.uk>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: ipc/testmsg GPF.
On Mon, Mar 11, 2013 at 03:03:22PM -0400, Peter Hurley wrote:
> On Mon, 2013-03-11 at 14:26 -0400, Dave Jones wrote:
> > On Fri, Mar 08, 2013 at 07:27:01PM -0500, Peter Hurley wrote:
> >
> > > On Thu, 2013-03-07 at 16:38 -0500, Dave Jones wrote:
> > >
> > > > general protection fault: 0000 [#1] PREEMPT SMP
> > > > Modules linked in: rose ax25 phonet lockd sunrpc ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_conntrack nf_conntrack ip6table_filter ip6_tables snd_hda_codec_realtek snd_hda_intel btusb snd_hda_codec bluetooth snd_pcm snd_page_alloc snd_timer snd vhost_net rfkill tun macvtap usb_debug macvlan microcode serio_raw pcspkr kvm_amd soundcore edac_core r8169 mii kvm
> > > > CPU 0
> > > > Pid: 845, comm: trinity-child14 Not tainted 3.9.0-rc1+ #70 Gigabyte Technology Co., Ltd. GA-MA78GM-S2H/GA-MA78GM-S2H
> > > > RIP: 0010:[<ffffffff812b7b00>] [<ffffffff812b7b00>] testmsg.isra.1+0x40/0x60
> > > > RSP: 0018:ffff880122b0fe78 EFLAGS: 00010246
> > > > RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000001
> > > > RDX: 0000000000000002 RSI: 000000002c24a9b2 RDI: 697665642d737983
> > > > RBP: ffff880122b0fe78 R08: fffffff3f14b03ae R09: 0000000000000000
> > > > R10: ffff880127bd8000 R11: 0000000000000000 R12: 000000002c24a9b2
> > > > R13: ffff880123360798 R14: ffff8801233606e8 R15: 697665642d737973
> > > > FS: 00007f2672bd3740(0000) GS:ffff88012ae00000(0000) knlGS:0000000000000000
> > > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > CR2: 00007f2672b96068 CR3: 0000000127bc1000 CR4: 00000000000007f0
> > > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > > > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> > > > Process trinity-child14 (pid: 845, threadinfo ffff880122b0e000, task ffff880127bd8000)
> > > > Stack:
> > > > ffff880122b0ff68 ffffffff812b8e7e ffff8801276d5b90 ffff880127bd8000
> > > > ffff880127bd8000 ffff880127bd8000 0000000000000000 ffffffff812b78c0
> > > > 0000000000000000 ffffffff81c7a260 0000000000000000 0000000000001000
> > > > Call Trace:
> > > > [<ffffffff812b8e7e>] do_msgrcv+0x1de/0x670
> > > > [<ffffffff812b78c0>] ? load_msg+0x180/0x180
> > > > [<ffffffff810b8685>] ? trace_hardirqs_on_caller+0x115/0x1a0
> > > > [<ffffffff81341aae>] ? trace_hardirqs_on_thunk+0x3a/0x3f
> > > > [<ffffffff812b9325>] sys_msgrcv+0x15/0x20
> > > > [<ffffffff816cd982>] system_call_fastpath+0x16/0x1b
> > > > Code: 83 fa 04 74 16 31 c0 5d c3 66 90 ff ca b8 01 00 00 00 74 f3 31 c0 eb ef 0f 1f 00 48 39 37 b8 01 00 00 00 7e e2 31 c0 eb de 66 90 <48> 3b 37 75 d5 b8 01 00 00 00 5d c3 0f 1f 40 00 48 3b 37 74 c5
> > > >
> > > > 0000000000000000 <.text>:
> > > > 0: 48 3b 37 cmp (%rdi),%rsi
> > > > 3: 75 d5 jne 0xffffffffffffffda
> > > > 5: b8 01 00 00 00 mov $0x1,%eax
> > > > a: 5d pop %rbp
> > > > b: c3 retq
> > > > c: 0f 1f 40 00 nopl 0x0(%rax)
> > > > 10: 48 3b 37 cmp (%rdi),%rsi
> > > > 13: 74 c5 je 0xffffffffffffffda
> > > >
> > > > rdi is ascii. "ived-sy�" Curious.
> > > >
> > > > EIP is here in testmsg.
> > > >
> > > > case SEARCH_EQUAL:
> > > > if (msg->m_type == type)
> > > > 240: 48 3b 37 cmp (%rdi),%rsi
> > > > 243: 75 d5 jne 21a <testmsg.isra.1+0x1a>
> > > > {
> >
> > I just hit this again on rc2 which looks like it has the fixes that
> > Peter mentions above. This time rdi was 6b6b6b6b6b6b6b7b
> >
> > Dave
>
> Sorry, Dave. The fix must be in the other 8 patches that Andrew didn't
> want to apply. I run trinity 10 or more times a day and can't get this
> to trigger with the whole series.
bad news: Turns out my recent testing where I thought your patches fixed
this was incorrect. I had excluded fuzz testing of msgrcv, so it was never
getting exercised.
When I put that back, rc4 + your patches still crashes.
However the crash looks slightly different..
(That may be because I upgraded the compiler from 4.7->4.8 last week)
general protection fault: 0000 [#1] PREEMPT SMP
Modules linked in: af_key phonet cmtp rose kernelcapi l2tp_ppp l2tp_netlink l2tp_core pppoe pppox hidp can_raw ppp_generic slhc nfnetlink scsi_transport_iscsi can_bcm ipt_ULOG can irda appletalk ipx rds p8023 p8022 atm decnet crc_ccitt x25 psnap af_802154 ax25 llc nfc lockd sunrpc ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_conntrack nf_conntrack ip6table_filter ip6_tables btusb bluetooth snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_pcm snd_page_alloc rfkill vhost_net tun macvtap microcode macvlan edac_core snd_timer kvm_amd snd serio_raw kvm r8169 pcspkr soundcore mii radeon backlight drm_kms_helper ttm
CPU 1
Pid: 1067, comm: trinity-child1 Not tainted 3.9.0-rc4+ #120 Gigabyte Technology Co., Ltd. GA-MA78GM-S2H/GA-MA78GM-S2H
RIP: 0010:[<ffffffff812c2e9e>] [<ffffffff812c2e9e>] do_msgrcv+0x1ee/0x5f0
RSP: 0018:ffff8800be6dde98 EFLAGS: 00010297
RAX: 0000000001868405 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff8800be68c920 RSI: 0000000000004000 RDI: ffff8800cfb206e8
RBP: ffff8800be6ddf68 R08: 0000000000000001 R09: 0000000000000001
R10: ffff8800be68c920 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8800cfb20798 R14: ffff8800cfb206e8 R15: 6b6b6b6b6b6b6b6b
FS: 00007f1bf1243740(0000) GS:ffff88012b000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1bf1206068 CR3: 00000000be5e0000 CR4: 00000000000007e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process trinity-child1 (pid: 1067, threadinfo ffff8800be6dc000, task ffff8800be68c920)
Stack:
ffff8800bb674f50 ffff8800be68c920 ffff8800be68c920 ffff8800be68c920
ffffffff812c1b40 0000000000afb000 ffffffff81c7ad20 0000000001868405
0000000000000000 000040002e16f9d4 0000000000000001 ffff8800be68c920
Call Trace:
[<ffffffff812c1b40>] ? msg_security+0x10/0x10
[<ffffffff810b6bc5>] ? trace_hardirqs_on_caller+0x115/0x1a0
[<ffffffff8134aa6e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff812c32b5>] sys_msgrcv+0x15/0x20
[<ffffffff816cda02>] system_call_fastpath+0x16/0x1b
Code: cc 83 fb 04 0f 84 f3 00 00 00 8b 74 24 4c 85 f6 0f 84 18 02 00 00 48 8b 44 24 38 48 39 44 24 50 0f 84 12 02 00 00 4c 89 7c 24 60 <4d> 8b 3f 48 ff 44 24 50 4d 39 ef 75 9d 0f 1f 44 00 00 48 81 7c
2b:* 4d 8b 3f mov (%r15),%r15 <-- trapping instruction
2e: 48 ff 44 24 50 incq 0x50(%rsp)
33: 4d 39 ef cmp %r13,%r15
36: 75 9d jne 0xffffffffffffffd5
38: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
3d: 48 rex.W
3e: 81 .byte 0x81
3f: 7c .byte 0x7c
objdump -S output shows that this is here in do_msgrcv()
875 } else
876 break;
877 msg_counter++;
878 }
879 tmp = tmp->next;
880 }
881 if (!IS_ERR(msg)) {
the tmp->next deref goes chasing a freed pointer.
Dave
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