Messages in this thread | | | Date | Fri, 29 Mar 2013 15:01:35 -0400 | From | Dave Jones <> | Subject | Re: ipc,sem: sysv semaphore scalability |
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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@redhat.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@linux-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.
I owe Peter an apology. I just hit it again with that backed out. Andrew, might as well drop that revert.
BUG: unable to handle kernel NULL pointer dereference at 000000000000000f IP: [<ffffffff812c24ca>] testmsg.isra.5+0x1a/0x60 PGD 10fd95067 PUD 10f767067 PMD 0 Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC Modules linked in: phonet netrom llc2 af_key rose af_rxrpc caif_socket caif can_raw cmtp kernelcapi ipt_ULOG nfnetlink can_bcm can scsi_transport_iscsi af_802154 irda ax25 atm ipx x25 p8023 p8022 appletalk pppoe decnet pppox ppp_generic nfc rds slhc psnap crc_ccitt llc lockd sunrpc ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_conntrack nf_conntrack ip6table_filter ip6_tables raid0 snd_hda_codec_realtek snd_hda_intel btusb snd_hda_codec bluetooth microcode serio_raw snd_pcm edac_core pcspkr snd_page_alloc rfkill snd_timer snd soundcore r8169 mii vhost_net tun macvtap macvlan kvm_amd kvm radeon backlight drm_kms_helper ttm CPU 2 Pid: 958, comm: trinity-child20 Not tainted 3.9.0-rc4+ #7 Gigabyte Technology Co., Ltd. GA-MA78GM-S2H/GA-MA78GM-S2H RIP: 0010:[<ffffffff812c24ca>] [<ffffffff812c24ca>] testmsg.isra.5+0x1a/0x60 RSP: 0018:ffff880117bb5e88 EFLAGS: 00010246 RAX: ffffffffffffffff RBX: 0000000000000004 RCX: 0000000000000078 RDX: 0000000000000004 RSI: fffffffffffffffe RDI: 000000000000000f RBP: ffff880117bb5e88 R08: 0000000000000004 R09: 0000000000000001 R10: ffff880117bb8000 R11: 0000000000000001 R12: fffffffffffffffe R13: ffff88010fd10308 R14: ffff88010fd10258 R15: ffffffffffffffff FS: 00007fa89c256740(0000) GS:ffff88012aa00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000000000f CR3: 000000010f76c000 CR4: 00000000000007e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process trinity-child20 (pid: 958, threadinfo ffff880117bb4000, task ffff880117bb8000) Stack: ffff880117bb5f68 ffffffff812c3746 0000000000000000 ffff880117bb8000 ffff880117bb8000 ffff880117bb8000 ffffffff81c7ace0 ffffffff812c2430 0000000000000004 0000000000000000 000000000000ffff 00000000652a928e Call Trace: [<ffffffff812c3746>] do_msgrcv+0x1a6/0x5f0 [<ffffffff812c2430>] ? msg_security+0x10/0x10 [<ffffffff810b6c55>] ? trace_hardirqs_on_caller+0x115/0x1a0 [<ffffffff8134b39e>] ? trace_hardirqs_on_thunk+0x3a/0x3f [<ffffffff812c3ba5>] sys_msgrcv+0x15/0x20 [<ffffffff816cd942>] system_call_fastpath+0x16/0x1b Code: c3 48 c7 c0 f2 ff ff ff eb e5 0f 1f 80 00 00 00 00 66 66 66 66 90 55 83 fa 02 48 89 e5 74 3a 7e 28 83 fa 03 74 13 83 fa 04 75 0a <48> 39 37 b8 01 00 00 00 7e 02 31 c0 5d c3 48 3b 37 74 f7 b8 01 RIP [<ffffffff812c24ca>] testmsg.isra.5+0x1a/0x60
I think I wasn't seeing that this last week because I had inadvertantly disabled DEBUG_PAGEALLOC
and.. we're back to square one.
Dave
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