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Message-ID: <OF55F9E87C.A024C73F-ON652573DA.003BF324-652573DA.003B3739@in.ibm.com> Date: Thu, 24 Jan 2008 16:16:47 +0530 From: Krishna Kumar2 <krkumar2@...ibm.com> To: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi> Cc: Andrew Morton <akpm@...ux-foundation.org>, David Miller <davem@...emloft.net>, Denys Fedoryshchenko <denys@...p.net.lb>, Dave Young <hidave.darkstar@...il.com>, Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>, LKML <linux-kernel@...r.kernel.org>, Netdev <netdev@...r.kernel.org>, netdev-owner@...r.kernel.org Subject: Re: 2.6.24-rc8-mm1 : net tcp_input.c warnings Hi Ilpo, I have tried parallel iperfs with this patch and don't get any more warnings. I will run overnight to be sure. thanks, - KK netdev-owner@...r.kernel.org wrote on 01/24/2008 03:24:18 PM: > On Thu, 24 Jan 2008, Dave Young wrote: > > Hi Dave (& others), > > > Thanks. > > Thanks a lot, I was first to ignore all these because they occurred > with newreno, but looked again... :-/ > > > New warning trigged with your debug patch: > > This was probably with the earlier one I sent to you because there's still > this case remaining which itself is valid: > > > P: 5 L: 0 vs 0 S: 0 vs 1 w: 2044790889-2044796616 (0) > > ...snip... this is still ok state (S+L <= P): > > > P: 5 L: 0 vs 0 S: 0 vs 3 w: 2044790889-2044796616 (0) > > TCP wq(s) < > > TCP wq(h) +++h+< > > l0 s3 f0 p5 seq: su2044790889 hs2044795029 sn2044796616 > > ------------[ cut here ]------------ > > WARNING: at net/ipv4/tcp_input.c:2169 tcp_mark_head_lost+0x122/0x150() > > Modules linked in: snd_seq_dummy snd_seq_oss snd_seq_midi_event > > snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss eeprom e100 psmouse > > snd_hda_intel snd_pcm snd_timer btusb bluetooth serio_raw snd 3c59x sg > > evdev thermal soundcore rtc_cmos snd_page_alloc rtc_core rtc_lib > > i2c_i801 processor button intel_agp dcdbas pcspkr agpgart > > Pid: 0, comm: swapper Not tainted 2.6.24-rc8-mm1 #8 > > [<c0132100>] ? have_callable_console+0x20/0x30 > > [<c0131844>] warn_on_slowpath+0x54/0x80 > > [<c03ffe54>] ? tcp_print_queue+0x1a4/0x230 > > [<c0132438>] ? vprintk+0x308/0x320 > > [<c0132438>] ? vprintk+0x308/0x320 > > [<c0132438>] ? vprintk+0x308/0x320 > > [<c03ffff6>] ? tcp_verify_wq+0x116/0x1c0 > > [<c03f6052>] tcp_mark_head_lost+0x122/0x150 > > [<c03f60ca>] tcp_update_scoreboard+0x4a/0x190 > > [<c03f6e7a>] tcp_fastretrans_alert+0x4da/0x700 > > [<c03f7e63>] tcp_ack+0x1b3/0x3a0 > > [<c03fa21b>] tcp_rcv_established+0x3eb/0x710 > > [<c0401c05>] tcp_v4_do_rcv+0xe5/0x100 > > [<c04021fb>] tcp_v4_rcv+0x5db/0x660 > > [<c0401fa7>] ? tcp_v4_rcv+0x387/0x660 > > [<c03e5eed>] ? ip_local_deliver_finish+0x2d/0x1d0 > > [<c03e5f44>] ip_local_deliver_finish+0x84/0x1d0 > > [<c03e5eed>] ? ip_local_deliver_finish+0x2d/0x1d0 > > [<c0156b97>] ? __lock_release+0x47/0x70 > > [<c03e6147>] ip_local_deliver+0xb7/0xc0 > > [<c03e6202>] ip_rcv_finish+0xb2/0x3c0 > > [<c03c01d8>] ? sock_def_readable+0x48/0xa0 > > [<c03be061>] ? sock_queue_rcv_skb+0xb1/0x1a0 > > [<c03be0a7>] ? sock_queue_rcv_skb+0xf7/0x1a0 > > [<c03e669f>] ip_rcv+0x18f/0x290 > > [<c042fb10>] ? packet_rcv_spkt+0xd0/0x130 > > [<c03c8da6>] netif_receive_skb+0x2b6/0x330 > > [<c03c8c17>] ? netif_receive_skb+0x127/0x330 > > [<c03c8ea3>] ? process_backlog+0x83/0x100 > > [<c03c8eae>] process_backlog+0x8e/0x100 > > [<c03c90bc>] net_rx_action+0x13c/0x230 > > [<c03c8fd9>] ? net_rx_action+0x59/0x230 > > [<c0136f63>] __do_softirq+0x93/0x120 > > [<c013706a>] do_softirq+0x7a/0x80 > > [<c0137135>] irq_exit+0x65/0x90 > > [<c01078b1>] do_IRQ+0x41/0x80 > > [<c0155659>] ? trace_hardirqs_on+0xb9/0x130 > > [<c01059ca>] common_interrupt+0x2e/0x34 > > [<c0103390>] ? mwait_idle_with_hints+0x40/0x50 > > [<c01033a0>] ? mwait_idle+0x0/0x20 > > [<c01033b2>] mwait_idle+0x12/0x20 > > [<c0103141>] cpu_idle+0x61/0x110 > > [<c04339fd>] rest_init+0x5d/0x60 > > [<c05a47fa>] start_kernel+0x1fa/0x260 > > [<c05a4190>] ? unknown_bootoption+0x0/0x130 > > ======================= > > ---[ end trace 14b601818e6903ac ]--- > > ------------[ cut here ]------------ > > WARNING: at net/ipv4/tcp_ipv4.c:197 tcp_verify_wq+0x1b6/0x1c0() > > Modules linked in: snd_seq_dummy snd_seq_oss snd_seq_midi_event > > snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss eeprom e100 psmouse > > snd_hda_intel snd_pcm snd_timer btusb bluetooth serio_raw snd 3c59x sg > > evdev thermal soundcore rtc_cmos snd_page_alloc rtc_core rtc_lib > > i2c_i801 processor button intel_agp dcdbas pcspkr agpgart > > Pid: 0, comm: swapper Not tainted 2.6.24-rc8-mm1 #8 > > [<c0132100>] ? have_callable_console+0x20/0x30 > > [<c0131844>] warn_on_slowpath+0x54/0x80 > > [<c01317da>] ? print_oops_end_marker+0x2a/0x30 > > [<c0131849>] ? warn_on_slowpath+0x59/0x80 > > [<c03ffe54>] ? tcp_print_queue+0x1a4/0x230 > > [<c0132438>] ? vprintk+0x308/0x320 > > [<c0132438>] ? vprintk+0x308/0x320 > > [<c0400096>] tcp_verify_wq+0x1b6/0x1c0 > > [<c03ffff6>] ? tcp_verify_wq+0x116/0x1c0 > > [<c03f5ffc>] tcp_mark_head_lost+0xcc/0x150 > > [<c03f60ca>] tcp_update_scoreboard+0x4a/0x190 > > [<c03f6e7a>] tcp_fastretrans_alert+0x4da/0x700 > > [<c03f7e63>] tcp_ack+0x1b3/0x3a0 > > [<c03fa21b>] tcp_rcv_established+0x3eb/0x710 > > [<c0401c05>] tcp_v4_do_rcv+0xe5/0x100 > > [<c04021fb>] tcp_v4_rcv+0x5db/0x660 > > [<c0401fa7>] ? tcp_v4_rcv+0x387/0x660 > > [<c03e5eed>] ? ip_local_deliver_finish+0x2d/0x1d0 > > [<c03e5f44>] ip_local_deliver_finish+0x84/0x1d0 > > [<c03e5eed>] ? ip_local_deliver_finish+0x2d/0x1d0 > > [<c0156b97>] ? __lock_release+0x47/0x70 > > [<c03e6147>] ip_local_deliver+0xb7/0xc0 > > [<c03e6202>] ip_rcv_finish+0xb2/0x3c0 > > [<c03c01d8>] ? sock_def_readable+0x48/0xa0 > > [<c03be061>] ? sock_queue_rcv_skb+0xb1/0x1a0 > > [<c03be0a7>] ? sock_queue_rcv_skb+0xf7/0x1a0 > > [<c03e669f>] ip_rcv+0x18f/0x290 > > [<c042fb10>] ? packet_rcv_spkt+0xd0/0x130 > > [<c03c8da6>] netif_receive_skb+0x2b6/0x330 > > [<c03c8c17>] ? netif_receive_skb+0x127/0x330 > > [<c03c8ea3>] ? process_backlog+0x83/0x100 > > [<c03c8eae>] process_backlog+0x8e/0x100 > > [<c03c90bc>] net_rx_action+0x13c/0x230 > > [<c03c8fd9>] ? net_rx_action+0x59/0x230 > > [<c0136f63>] __do_softirq+0x93/0x120 > > [<c013706a>] do_softirq+0x7a/0x80 > > [<c0137135>] irq_exit+0x65/0x90 > > [<c01078b1>] do_IRQ+0x41/0x80 > > [<c0155659>] ? trace_hardirqs_on+0xb9/0x130 > > [<c01059ca>] common_interrupt+0x2e/0x34 > > [<c0103390>] ? mwait_idle_with_hints+0x40/0x50 > > [<c01033a0>] ? mwait_idle+0x0/0x20 > > [<c01033b2>] mwait_idle+0x12/0x20 > > [<c0103141>] cpu_idle+0x61/0x110 > > [<c04339fd>] rest_init+0x5d/0x60 > > [<c05a47fa>] start_kernel+0x1fa/0x260 > > [<c05a4190>] ? unknown_bootoption+0x0/0x130 > > ======================= > > ---[ end trace 14b601818e6903ac ]--- > > ...But this no longer is, and even more, L: 5 is not valid state at this > point all (should only happen if we went to RTO but it would reset S to > zero with newreno): > > > P: 5 L: 5 vs 5 S: 0 vs 3 w: 2044790889-2044796616 (0) > > TCP wq(s) LLLLl< > > TCP wq(h) +++h+< > > l5 s3 f0 p5 seq: su2044790889 hs2044795029 sn2044796616 > > Surprisingly, it was the first time the WARN_ON for left_out returned > correct location. This also explains why the patch I sent to Krishna > didn't print anything (it didn't end up into printing because I forgot > to add L+S>P check into to the state checking if). > > ...so please, could you (others than Denys) try this patch, it should > solve the issue. And Denys, could you confirm (and if necessary double > check) that the kernel you saw this similar problem with is the pure > Linus' mainline, i.e., without any net-2.6.25 or mm bits please, if so, > that problem persists. And anyway, there were some fackets_out related > problems reported as well and this doesn't help for that but I think I've > lost track of who was seeing it due to large number of reports :-), could > somebody refresh my memory because I currently don't have time to dig it > up from archives (at least on this week). > > > -- > i. > > -- > [PATCH] [TCP]: NewReno must count every skb while marking losses > > NewReno should add cnt per skb (as with FACK) instead of depending > on SACKED_ACKED bits which won't be set with it at all. > Effectively, NewReno should always exists after the first > iteration anyway (or immediately if there's already head in > lost_out. > > This was fixed earlier in net-2.6.25 but got reverted among other > stuff and I didn't notice that this is still necessary (actually > wasn't even considering this case while trying to figure out the > reports because I lived with different kind of code than it in > reality was). > > This should solve the WARN_ONs in TCP code that as a result of > this triggered multiple times in every place we check for this > invariant. > > Special thanks to Dave Young <hidave.darkstar@...il.com> and > Krishna Kumar2 <krkumar2@...ibm.com> for trying with my debug > patches. > > Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi> > --- > net/ipv4/tcp_input.c | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c > index 295490e..aa409a5 100644 > --- a/net/ipv4/tcp_input.c > +++ b/net/ipv4/tcp_input.c > @@ -2156,7 +2156,7 @@ static void tcp_mark_head_lost(struct sock *sk, int > packets, int fast_rexmit) > tp->lost_skb_hint = skb; > tp->lost_cnt_hint = cnt; > > - if (tcp_is_fack(tp) || > + if (tcp_is_fack(tp) || tcp_is_reno(tp) || > (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)) > cnt += tcp_skb_pcount(skb); > > -- > 1.5.2.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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