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Date: Tue, 9 Dec 2014 08:58:12 -0500 From: Andy Gospodarek <gospo@...ulusnetworks.com> To: Peter Schmitt <p.schmitt.82@....net> Cc: netdev@...r.kernel.org Subject: Re: PROBLEM: bonding status file in /proc not removed when using bond-device as a slave On Tue, Dec 09, 2014 at 01:04:53PM +0100, Peter Schmitt wrote: > Hi everyone, > > I want to create a master-backup bond that has two LACP bonds as slaves. Both There is no reason to do this. The bonding code you are running supports the ability to connect a single 802.3ad bond to different switches and should do exactly what you need. When you put all ports in the same bond you will notice that ports that go to one switch will be listed with a particular aggregator ID and all ports going to another switch will have a different aggregator ID. You will also see that the bond will list only one active aggregator. This should give you the behaviour you desire. Additionally look at 'ad_select' option in the bonding documentation to help tune when you switch from one link to another. > LACP slaves should be connected to different switches so that I have > connectivity even if one switch fails. > While experimenting with this setup on the recent LTS kernel 3.14.26 I have found the following behaviour: > When I add a bond device (by default an LACP bond, mode 4) to a master-backup > bond (mode 1) and then remove it, the corresponding status file for the bond remains in > /proc/net/bonding/ and when I do a cat on this file, the machine crashes or I get a > general protection fault. > > The following snippet creates such a scenario: > > #!/bin/bash > echo +bond1 > /sys/class/net/bonding_masters > echo 1 > /sys/class/net/bond1/bonding/mode > echo +bond2 > /sys/class/net/bonding_masters > echo +bond2 > /sys/class/net/bond1/bonding/slaves > echo -bond2 > /sys/class/net/bond1/bonding/slaves > echo -bond2 > /sys/class/net/bonding_masters > > After this is executed, the file /proc/net/bonding/bond2 still exists > while /sys/class/net/bonding_masters only shows bond1: > > > ls -lah /proc/net/bonding/bond* > r--r--r-- 1 root root 0 Dec 8 16:53 /proc/net/bonding/bond1 > r--r--r-- 1 root root 0 Dec 8 16:53 /proc/net/bonding/bond2 > > > cat /sys/class/net/bonding_masters > bond1 > > When I now make a "cat" on the file in /proc, I get a general protection fault > or even worse, the machine just crashes and is unresponsive and it can only be > fixed with a power-cycle. > > > uname -a > Linux bondingtest 3.14.26-x86 #1 SMP Sun Dec 7 11:29:36 CET 2014 i686 GNU/Linux > > The bonding module is loaded with the following options: > modprobe bonding miimon=100 max_bonds=0 mode=4 lacp_rate=1 xmit_hash_policy=layer2+3 > > > > cat /proc/net/bonding/bond2 > general protection fault: 0000 [#1] SMP· > Modules linked in: w83627hf hwmon_vid coretemp hwmon ip_set iptable_nat nf_nat_ipv4 ipt_REJECT nf_nat_irc nf_conntrack_irc nf_nat_ftp nf_nat nf_conntrack_ftp msr ipmi_devintf ipmi_msghandler ip_gre gre bonding pcspkr i3200_edac edac_core uhci_hcd ehci_pci ehci_hcd lpc_ich mfd_core pata_acpi ata_generic shpchp e1000e ptp pps_core [last unloaded: cpuid] > CPU: 0 PID: 31747 Comm: cat Not tainted 3.14.26-x86_64 #1 > Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./To be filled by O.E.M., BIOS 080015 06/29/2009 > task: ffff8800d61d77b0 ti: ffff8800d6068000 task.ti: ffff8800d6068000 > RIP: 0010:[<ffffffffc00f7ef0>] [<ffffffffc00f7ef0>] bond_info_seq_show+0x2d0/0x5e0 [bonding] > RSP: 0018:ffff8800d6069e08 EFLAGS: 00010212 > RAX: 5f7367705f656c62 RBX: ffff880198570380 RCX: 0000000000000001 > RDX: ffffffffc00f9547 RSI: ffffffffc00f954f RDI: ffff880198570380 > RBP: ffff8800d6069e48 R08: ffffffff9413ed60 R09: ffff8800dba15cd4 > R10: 0000000000000001 R11: 0000000000000000 R12: ffff8800d60917c0 > R13: 656b636f6c6e756d R14: ffff880197d469c0 R15: ffff8800d6069e90 > FS: 0000000000000000(0000) GS:ffff88019fc00000(0063) knlGS:00000000f761c8d0 > CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b > CR2: 000000000804ce10 CR3: 00000000db8cd000 CR4: 00000000000407f0 > Stack: > ffff8800d6069e48 ffffffffc00f8318 ffff8801986ba9f0 ffff880197d469c0 > ffff880198570380 0000000000000001 ffff880197d469c0 ffff8800d6069e90 > ffff8800d6069ec8 ffffffff9413eed1 ffff880198289a58 0000000008213000 > Call Trace: > [<ffffffffc00f8318>] ? bond_info_seq_start+0x28/0xa8 [bonding] > [<ffffffff9413eed1>] seq_read+0x171/0x3f0 > [<ffffffff94175a7e>] proc_reg_read+0x3e/0x70 > [<ffffffff9411e0e1>] vfs_read+0xa1/0x160 > [<ffffffff9411e281>] SyS_read+0x51/0xc0 > [<ffffffff94039c9c>] ? do_page_fault+0xc/0x10 > [<ffffffff94516cdf>] sysenter_dispatch+0x7/0x1e > Code: 04 49 8b 55 00 48 c7 c6 2a 95 0f c0 48 89 df 31 c0 e8 d5 6c 04 d4 49 8b 04 24 48 c7 c2 47 95 0f c0 48 c7 c6 4f 95 0f c0 48 89 df <48> 8b 40 48 a8 04 48 c7 c0 4c 95 0f c0 48 0f 44 d0 31 c0 e8 a8· > RIP [<ffffffffc00f7ef0>] bond_info_seq_show+0x2d0/0x5e0 [bonding] > RSP <ffff8800d6069e08> > ---[ end trace 96fae3d9de6068c7 ]--- > Segmentation fault > > ver_linux: > Linux bondingtest 3.14.26-x86 #1 SMP Sun Dec 7 11:29:36 CET 2014 i686 GNU/Linux > > Gnu C 4.4.3 > Gnu make 3.81 > binutils 2.20.1 > util-linux 2.17.2 > mount support > module-init-tools found > e2fsprogs 1.42.11 > PPP 2.4.5 > Linux C Library 2.11.1 > Dynamic linker (ldd) 2.11.1 > Procps 3.2.8 > Net-tools 1.60 > Kbd 1.15 > Sh-utils found > Modules Loaded xt_TPROXY xt_set xt_socket nf_defrag_ipv6 xt_REDIRECT ip_set_hash_ip hwmon_vid hwmon bridge ip_set iptable_nat nf_nat_ipv4 ipt_REJECT nf_nat_irc nf_conntrack_irc nf_nat_ftp nf_nat nf_conntrack_ftp msr ipmi_devintf ipmi_msghandler ip_gre gre bonding pcspkr shpchp uhci_hcd ehci_pci ehci_hcd lpc_ich mfd_core pata_acpi ata_generic > > If you have any questions or need more information or tests, I will gladly help you with that. > > Thank you in advance. > > Best regards, > Peter Schmitt > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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