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Message-ID: <20130329161746.GA8391@redhat.com>
Date: Fri, 29 Mar 2013 12:17:46 -0400
From: Dave Jones <davej@...hat.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Rik van Riel <riel@...riel.com>, torvalds@...ux-foundation.org,
davidlohr.bueso@...com, linux-kernel@...r.kernel.org,
hhuang@...hat.com, jason.low2@...com, walken@...gle.com,
lwoodman@...hat.com, chegu_vinod@...com,
Peter Hurley <peter@...leysoftware.com>
Subject: Re: ipc,sem: sysv semaphore scalability
On Tue, Mar 26, 2013 at 12:43:09PM -0700, Andrew Morton wrote:
> On Tue, 26 Mar 2013 15:28:52 -0400 Dave Jones <davej@...hat.com> wrote:
>
> > On Thu, Mar 21, 2013 at 02:10:58PM -0700, Andrew Morton wrote:
> >
> > > Whichever way we go, we should get a wiggle on - this has been hanging
> > > around for too long. Dave, do you have time to determine whether
> > > reverting 88b9e456b1649722673ff ("ipc: don't allocate a copy larger
> > > than max") fixes things up?
> >
> > Ok, with that reverted it's been grinding away for a few hours without incident.
> > Normally I see the oops within a minute or so.
>
> OK, thanks, I queued a revert:
>
> From: Andrew Morton <akpm@...ux-foundation.org>
> Subject: revert "ipc: don't allocate a copy larger than max"
>
> Revert 88b9e456b164. Dave has confirmed that this was causing oopses
> during trinity testing.
Now that I have that reverted, I'm not seeing msgrcv traces any more, but
I've started seeing this..
general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
Modules linked in: l2tp_ppp l2tp_netlink l2tp_core llc2 phonet netrom rose af_key af_rxrpc caif_socket caif can_raw cmtp kernelcapi can_bcm can nfnetlink ipt_ULOG scsi_transport_iscsi af_802154 ax25 atm ipx pppoe pppox x25 nfc irda ppp_generic p8023 slhc p8022 appletalk decnet crc_ccitt rds psnap llc lockd sunrpc ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_conntrack nf_conntrack ip6table_filter ip6_tables snd_hda_codec_realtek btusb snd_hda_intel bluetooth snd_hda_codec raid0 snd_pcm rfkill microcode serio_raw pcspkr snd_page_alloc edac_core snd_timer snd soundcore r8169 mii vhost_net tun macvtap macvlan kvm_amd kvm radeon backlight drm_kms_helper ttm
CPU 3
Pid: 1850, comm: trinity-child37 Tainted: G B 3.9.0-rc4+ #7 Gigabyte Technology Co., Ltd. GA-MA78GM-S2H/GA-MA78GM-S2H
RIP: 0010:[<ffffffff812c20fb>] [<ffffffff812c20fb>] free_msg+0x2b/0x40
RSP: 0018:ffff8800a1d3bdd0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 6b6b6b6b6b6b6b6b RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff810b6ced
RBP: ffff8800a1d3bde0 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88009997e620
R13: ffffffff81c7ace0 R14: ffff8800caf359d8 R15: ffffffff81c7b024
FS: 00007f2d7be64740(0000) GS:ffff88012ac00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00007f8bd7bb6000 CR3: 00000000a1f0a000 CR4: 00000000000007e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process trinity-child37 (pid: 1850, threadinfo ffff8800a1d3a000, task ffff8800a1e62490)
Stack:
6b6b6b6b6b6b6b6b ffff8800caf35928 ffff8800a1d3be18 ffffffff812c289f
0000000000000000 ffffffff81c7ace0 ffff8800caf35928 0000000000000000
ffff8800a1d3be28 ffff8800a1d3bec8 ffffffff812c2a93 ffff8800a1d3be40
Call Trace:
[<ffffffff812c289f>] freeque+0xcf/0x140
[<ffffffff812c2a93>] msgctl_down.constprop.9+0x183/0x200
[<ffffffff810767cf>] ? up_read+0x1f/0x40
[<ffffffff816c8f94>] ? __do_page_fault+0x214/0x5b0
[<ffffffff810b94be>] ? lock_release_non_nested+0x23e/0x320
[<ffffffff812c2da9>] sys_msgctl+0x139/0x400
[<ffffffff816c5d4d>] ? retint_swapgs+0xe/0x13
[<ffffffff810b6c55>] ? trace_hardirqs_on_caller+0x115/0x1a0
[<ffffffff8134b39e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff816cd942>] system_call_fastpath+0x16/0x1b
Code: 66 66 66 66 90 55 48 89 e5 41 54 49 89 fc 53 e8 fc 5e 01 00 49 8b 5c 24 20 4c 89 e7 e8 8f af ed ff 48 85 db 75 05 eb 13 4c 89 e3 <4c> 8b 23 48 89 df e8 7a af ed ff 4d 85 e4 75 ed 5b 41 5c 5d c3
(Taint is from an ext4 double-free I just reported in a separate thread)
decoded..
0: 66 66 66 66 90 data32 data32 data32 xchg %ax,%ax
5: 55 push %rbp
6: 48 89 e5 mov %rsp,%rbp
9: 41 54 push %r12
b: 49 89 fc mov %rdi,%r12
e: 53 push %rbx
f: e8 fc 5e 01 00 callq 0x15f10
14: 49 8b 5c 24 20 mov 0x20(%r12),%rbx
19: 4c 89 e7 mov %r12,%rdi
1c: e8 8f af ed ff callq 0xffffffffffedafb0
21: 48 85 db test %rbx,%rbx
24: 75 05 jne 0x2b
26: eb 13 jmp 0x3b
28: 4c 89 e3 mov %r12,%rbx
2b:* 4c 8b 23 mov (%rbx),%r12 <-- trapping instruction
2e: 48 89 df mov %rbx,%rdi
31: e8 7a af ed ff callq 0xffffffffffedafb0
36: 4d 85 e4 test %r12,%r12
39: 75 ed jne 0x28
3b: 5b pop %rbx
3c: 41 5c pop %r12
3e: 5d pop %rbp
3f: c3 retq
Disassembly of free_msg shows..
seg = msg->next;
kfree(msg);
while (seg != NULL) {
struct msg_msgseg *tmp = seg->next;
30b: 4c 8b 23 mov (%rbx),%r12
kfree(seg);
30e: 48 89 df mov %rbx,%rdi
311: e8 00 00 00 00 callq 316 <free_msg+0x36>
Looks like seg was already kfree'd.
Dave
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