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Date: Tue, 1 Jul 2008 01:09:54 +0200 From: Peter Palfrader <peter@...frader.org> To: linux-kernel@...r.kernel.org Cc: netdev@...r.kernel.org Subject: 2.6.25.6: warn_on_slowpath in tcp_input.c Hey, I found a couple of backtraces on one of our machines. I didn't notice anything weird on it other than that; it seems to be pushing its constant 40 to 60 Mbps as always. I've had 13 or so of them since upgrading the machine to a 2.6.25 kernel 20 days ago. Linux saens 2.6.25.6-dl380 #2 SMP Tue Jun 10 17:54:44 CEST 2008 i686 GNU/Linux Jun 30 04:08:50 saens kernel: [1659894.570682] ------------[ cut here ]------------ Jun 30 04:08:50 saens kernel: [1659894.570682] WARNING: at net/ipv4/tcp_input.c:2539 tcp_ack+0x1b35/0x1d72() Jun 30 04:08:50 saens kernel: [1659894.570682] Pid: 0, comm: swapper Not tainted 2.6.25.6-dl380 #2 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c0122f8d>] warn_on_slowpath+0x49/0x59 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c0149eb8>] ? __free_pages+0x27/0x29 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c0149ed9>] ? free_pages+0x1f/0x21 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c015fb06>] ? kmem_freepages+0x90/0xc4 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c015fd33>] ? slab_destroy+0x2f/0x47 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c015fe64>] ? free_block+0x119/0x12e Jun 30 04:08:50 saens kernel: [1659894.570682] [<c0284215>] ? memmove+0x28/0x2f Jun 30 04:08:50 saens kernel: [1659894.570682] [<c015fbb2>] ? cache_flusharray+0x78/0xb8 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c03b492a>] ? bictcp_cong_avoid+0x13/0x383 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c035a4bb>] ? skb_release_data+0x59/0x85 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c038d72b>] tcp_ack+0x1b35/0x1d72 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c0395824>] ? tcp_v4_send_synack+0x9d/0xf2 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c03907e6>] tcp_rcv_established+0x41d/0x8c7 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c0374d0d>] ? tcp_error+0xaa/0x1c0 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c0374c63>] ? tcp_error+0x0/0x1c0 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c03967ef>] tcp_v4_do_rcv+0x3cb/0x50a Jun 30 04:08:50 saens kernel: [1659894.570682] [<c03842d1>] ? __inet_lookup_established+0xc7/0x179 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c039852e>] tcp_v4_rcv+0x573/0x777 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c037d0de>] ip_local_deliver_finish+0x7b/0x1af Jun 30 04:08:50 saens kernel: [1659894.570682] [<c037d5a7>] ip_local_deliver+0x2d/0x96 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c037d063>] ? ip_local_deliver_finish+0x0/0x1af Jun 30 04:08:50 saens kernel: [1659894.570682] [<c037ce97>] ip_rcv_finish+0xc7/0x293 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c0370e2c>] ? nf_hook_slow+0x4a/0xb5 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c037cdd0>] ? ip_rcv_finish+0x0/0x293 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c037d4a0>] ip_rcv+0x197/0x271 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c037cdd0>] ? ip_rcv_finish+0x0/0x293 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c035f472>] netif_receive_skb+0x220/0x2ac Jun 30 04:08:50 saens kernel: [1659894.570682] [<c02f3e43>] e100_poll+0x140/0x45d Jun 30 04:08:50 saens kernel: [1659894.570682] [<c0136a37>] ? hrtimer_start+0xb4/0x137 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c03614a1>] net_rx_action+0x89/0x16d Jun 30 04:08:50 saens kernel: [1659894.570682] [<c0127a07>] __do_softirq+0x75/0xe6 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c0127ab3>] do_softirq+0x3b/0x3d Jun 30 04:08:50 saens kernel: [1659894.570682] [<c0127d25>] irq_exit+0x63/0x75 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c010565b>] do_IRQ+0x45/0x7a Jun 30 04:08:50 saens kernel: [1659894.570682] [<c01035df>] common_interrupt+0x23/0x28 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c013007b>] ? sys_setregid+0xa/0x107 Jun 30 04:08:50 saens kernel: [1659894.570682] [<c01019bf>] ? default_idle+0x40/0x5f Jun 30 04:08:50 saens kernel: [1659894.570682] [<c010197f>] ? default_idle+0x0/0x5f Jun 30 04:08:50 saens kernel: [1659894.570682] [<c010189d>] cpu_idle+0x4f/0x8d Jun 30 04:08:50 saens kernel: [1659894.570682] [<c040b039>] rest_init+0x49/0x4b Jun 30 04:08:50 saens kernel: [1659894.570682] ======================= Jun 30 04:08:50 saens kernel: [1659894.570682] ---[ end trace 2b6550de0a1db34c ]--- Most are very similar, differences being these: --- 1a 2008-07-01 00:54:56.514224160 +0200 +++ 2 2008-07-01 00:55:03.410219826 +0200 @@ -8,11 +8,12 @@ [<c015fd33>] ? slab_destroy+0x2f/0x47 [<c015fe64>] ? free_block+0x119/0x12e [<c0284215>] ? memmove+0x28/0x2f + [<c0284215>] ? memmove+0x28/0x2f [<c015fbb2>] ? cache_flusharray+0x78/0xb8 - [<c03b492a>] ? bictcp_cong_avoid+0x13/0x383 [<c035a4bb>] ? skb_release_data+0x59/0x85 + [<c038ac46>] ? tcp_enter_frto_loss+0x163/0x1d3 [<c038d72b>] tcp_ack+0x1b35/0x1d72 - [<c0395824>] ? tcp_v4_send_synack+0x9d/0xf2 + [<c012b47b>] ? lock_timer_base+0x1f/0x40 [<c03907e6>] tcp_rcv_established+0x41d/0x8c7 [<c0374d0d>] ? tcp_error+0xaa/0x1c0 [<c0374c63>] ? tcp_error+0x0/0x1c0 or --- 1a 2008-07-01 00:54:56.514224160 +0200 +++ 3 2008-07-01 00:55:35.554219380 +0200 @@ -8,11 +8,10 @@ [<c015fd33>] ? slab_destroy+0x2f/0x47 [<c015fe64>] ? free_block+0x119/0x12e [<c0284215>] ? memmove+0x28/0x2f + [<c0284215>] ? memmove+0x28/0x2f [<c015fbb2>] ? cache_flusharray+0x78/0xb8 - [<c03b492a>] ? bictcp_cong_avoid+0x13/0x383 - [<c035a4bb>] ? skb_release_data+0x59/0x85 + [<c038ac46>] ? tcp_enter_frto_loss+0x163/0x1d3 [<c038d72b>] tcp_ack+0x1b35/0x1d72 - [<c0395824>] ? tcp_v4_send_synack+0x9d/0xf2 [<c03907e6>] tcp_rcv_established+0x41d/0x8c7 [<c0374d0d>] ? tcp_error+0xaa/0x1c0 [<c0374c63>] ? tcp_error+0x0/0x1c0 This one is different since it doesn't come via __free_pages but from ip_finish_output: ------------[ cut here ]------------ WARNING: at net/ipv4/tcp_input.c:2539 tcp_ack+0x1b35/0x1d72() Pid: 0, comm: swapper Not tainted 2.6.25.6-dl380 #2 [<c0122f8d>] warn_on_slowpath+0x49/0x59 [<c0380c14>] ? ip_finish_output+0x0/0x281 [<c038117b>] ? ip_output+0x5c/0x95 [<c0380c14>] ? ip_finish_output+0x0/0x281 [<c03808d3>] ? ip_local_out+0x18/0x1b [<c0284215>] ? memmove+0x28/0x2f [<c015fbb2>] ? cache_flusharray+0x78/0xb8 [<c035a4bb>] ? skb_release_data+0x59/0x85 [<c038ac46>] ? tcp_enter_frto_loss+0x163/0x1d3 [<c038d72b>] tcp_ack+0x1b35/0x1d72 [<c041a7ed>] ? _spin_unlock_bh+0xd/0xf [<c03752b9>] ? tcp_packet+0x496/0xb3d [<c038fd57>] tcp_rcv_state_process+0x40d/0xa7f [<c041a7de>] ? _read_unlock_bh+0xe/0x10 [<c0396540>] tcp_v4_do_rcv+0x11c/0x50a [<c03842d1>] ? __inet_lookup_established+0xc7/0x179 [<c039852e>] tcp_v4_rcv+0x573/0x777 [<c037d0de>] ip_local_deliver_finish+0x7b/0x1af [<c037d5a7>] ip_local_deliver+0x2d/0x96 [<c037d063>] ? ip_local_deliver_finish+0x0/0x1af [<c037ce97>] ip_rcv_finish+0xc7/0x293 [<c0370e2c>] ? nf_hook_slow+0x4a/0xb5 [<c037cdd0>] ? ip_rcv_finish+0x0/0x293 [<c037d4a0>] ip_rcv+0x197/0x271 [<c037cdd0>] ? ip_rcv_finish+0x0/0x293 [<c035f472>] netif_receive_skb+0x220/0x2ac [<c02f3e43>] e100_poll+0x140/0x45d [<c0136a37>] ? hrtimer_start+0xb4/0x137 [<c03614a1>] net_rx_action+0x89/0x16d [<c0127a07>] __do_softirq+0x75/0xe6 [<c0127ab3>] do_softirq+0x3b/0x3d [<c0127d25>] irq_exit+0x63/0x75 [<c010565b>] do_IRQ+0x45/0x7a [<c0127d17>] ? irq_exit+0x55/0x75 [<c010f0b2>] ? smp_apic_timer_interrupt+0x5d/0x8b [<c01035df>] common_interrupt+0x23/0x28 [<c013007b>] ? sys_setregid+0xa/0x107 [<c01019bf>] ? default_idle+0x40/0x5f [<c010197f>] ? default_idle+0x0/0x5f [<c010189d>] cpu_idle+0x4f/0x8d [<c040b039>] rest_init+0x49/0x4b ======================= ---[ end trace 2b6550de0a1db34c ]--- another variation of that is ------------[ cut here ]------------ WARNING: at net/ipv4/tcp_input.c:2539 tcp_ack+0x1b35/0x1d72() Pid: 0, comm: swapper Not tainted 2.6.25.6-dl380 #2 [<c0122f8d>] warn_on_slowpath+0x49/0x59 [<c0380d49>] ? ip_finish_output+0x135/0x281 [<c0380c14>] ? ip_finish_output+0x0/0x281 [<c0284215>] ? memmove+0x28/0x2f [<c015fbb2>] ? cache_flusharray+0x78/0xb8 [<c012b47b>] ? lock_timer_base+0x1f/0x40 [<c039112d>] ? tcp_snd_test+0x15/0xea [<c0391242>] ? tcp_may_send_now+0x40/0x59 [<c038d72b>] tcp_ack+0x1b35/0x1d72 [<c03907e6>] tcp_rcv_established+0x41d/0x8c7 [<c0374d0d>] ? tcp_error+0xaa/0x1c0 [<c0374c63>] ? tcp_error+0x0/0x1c0 [<c03967ef>] tcp_v4_do_rcv+0x3cb/0x50a [<c03842d1>] ? __inet_lookup_established+0xc7/0x179 [<c039852e>] tcp_v4_rcv+0x573/0x777 [<c037d0de>] ip_local_deliver_finish+0x7b/0x1af [<c037d5a7>] ip_local_deliver+0x2d/0x96 [<c037d063>] ? ip_local_deliver_finish+0x0/0x1af [<c037ce97>] ip_rcv_finish+0xc7/0x293 [<c0370e2c>] ? nf_hook_slow+0x4a/0xb5 [<c037cdd0>] ? ip_rcv_finish+0x0/0x293 [<c037d4a0>] ip_rcv+0x197/0x271 [<c037cdd0>] ? ip_rcv_finish+0x0/0x293 [<c035f472>] netif_receive_skb+0x220/0x2ac [<c02f3e43>] e100_poll+0x140/0x45d [<c013b458>] ? clockevents_program_event+0xae/0x104 [<c03614a1>] net_rx_action+0x89/0x16d [<c0127a07>] __do_softirq+0x75/0xe6 [<c0127ab3>] do_softirq+0x3b/0x3d [<c0127d25>] irq_exit+0x63/0x75 [<c010565b>] do_IRQ+0x45/0x7a [<c01035df>] common_interrupt+0x23/0x28 [<c013007b>] ? sys_setregid+0xa/0x107 [<c01019bf>] ? default_idle+0x40/0x5f [<c010197f>] ? default_idle+0x0/0x5f [<c010189d>] cpu_idle+0x4f/0x8d [<c040b039>] rest_init+0x49/0x4b ======================= ---[ end trace 2b6550de0a1db34c ]--- If you need to know anything else please let me know. Please CC me on replies, Peter -- | .''`. ** Debian GNU/Linux ** Peter Palfrader | : :' : The universal http://www.palfrader.org/ | `. `' Operating System | `- http://www.debian.org/ -- 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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