Re: [Bugme-new] [Bug 8797] New: WARNING from skb_gso_segment

On Mon, 23 Jul 2007 09:36:08 -0700 (PDT)
bugme-daemon@bugzilla.kernel.org wrote:

http://bugzilla.kernel.org/show_bug.cgi?id=8797

           Summary: WARNING from skb_gso_segment
           Product: Networking
           Version: 2.5
     KernelVersion: 2.6.22.1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: IPV4
        AssignedTo: shemminger@osdl.org
        ReportedBy: hmkash@arl.army.mil
                CC: herbert@gondor.apana.org.au


Most recent kernel where this bug did not occur: 2.6.20.4

Distribution: kernel.org

Hardware Environment: x86, dual-core Xeon, tg3, e1000

Software Environment: ip_vs, bonding

Problem Description: After upgrading kernels from 2.6.20.4 to 2.6.22.1, I
started getting tons (27,000+ a day) of the warning messages below resulting
from this change:

http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.22.y.git;a=commitdiff;h=f9d106a6d53b57b78eae5544f9582c643343a764

This is on a system that uses ip_vs to load balance DNS traffic. Other than
these warnings, everything appears to be normal with the load balanced DNS
traffic.

Jul 17 09:29:40 hlb1 kernel: WARNING: at net/core/dev.c:1286 skb_gso_segment()
Jul 17 09:29:40 hlb1 kernel:  [<c024d0c8>] skb_gso_segment+0x92/0x184
Jul 17 09:29:40 hlb1 kernel:  [<c024d224>] dev_gso_segment+0x10/0x34
Jul 17 09:29:40 hlb1 kernel:  [<c024d293>] dev_hard_start_xmit+0x4b/0xb1
Jul 17 09:29:40 hlb1 kernel:  [<c024d46b>] dev_queue_xmit+0x172/0x1fd
Jul 17 09:29:40 hlb1 kernel:  [<c0267828>] ip_output+0x274/0x2ad
Jul 17 09:29:40 hlb1 kernel:  [<c02673a7>] ip_finish_output+0x0/0x20d
Jul 17 09:29:40 hlb1 kernel:  [<c0267bbf>] ip_queue_xmit+0x35e/0x3a6
Jul 17 09:29:40 hlb1 kernel:  [<e0a2550c>] do_ip_vs_get_ctl+0x6f5/0x704 [ip_vs]
Jul 17 09:29:40 hlb1 kernel:  [<c0267828>] ip_output+0x274/0x2ad
Jul 17 09:29:40 hlb1 kernel:  [<e0a2687f>] ip_vs_dr_xmit+0x345/0x37b [ip_vs]
Jul 17 09:29:40 hlb1 kernel:  [<c02a336a>] _spin_lock_bh+0x8/0x10
Jul 17 09:29:40 hlb1 kernel:  [<c0276547>] tcp_cwnd_restart+0x17/0xad
Jul 17 09:29:40 hlb1 kernel:  [<c0276cbe>] tcp_transmit_skb+0x3e0/0x402
Jul 17 09:29:40 hlb1 kernel:  [<c0277846>] tso_fragment+0x15a/0x194
Jul 17 09:29:40 hlb1 kernel:  [<c0277f91>] tcp_write_xmit+0x1cc/0x22e
Jul 17 09:29:40 hlb1 kernel:  [<c0278004>] __tcp_push_pending_frames+0x11/0x60
Jul 17 09:29:40 hlb1 kernel:  [<c026e430>] tcp_sendmsg+0x9df/0xa95
Jul 17 09:29:40 hlb1 kernel:  [<c0287133>] inet_sendmsg+0x39/0x43
Jul 17 09:29:40 hlb1 kernel:  [<c0243be2>] do_sock_write+0xab/0xb2
Jul 17 09:29:40 hlb1 kernel:  [<c0243c39>] sock_aio_write+0x50/0x5c
Jul 17 09:29:40 hlb1 kernel:  [<c015c008>] do_sync_write+0xbf/0xfc
Jul 17 09:29:40 hlb1 kernel:  [<c02a2b70>] mutex_lock+0x13/0x22
Jul 17 09:29:40 hlb1 kernel:  [<c0129232>] autoremove_wake_function+0x0/0x33
Jul 17 09:29:40 hlb1 kernel:  [<c02472ad>] sock_common_getsockopt+0x1c/0x21
Jul 17 09:29:40 hlb1 kernel:  [<c0244c49>] sys_getsockopt+0x7d/0x9c
Jul 17 09:29:40 hlb1 kernel:  [<c015c10e>] vfs_write+0xc9/0x133
Jul 17 09:29:40 hlb1 kernel:  [<c015c220>] sys_write+0x41/0x67
Jul 17 09:29:40 hlb1 kernel:  [<c0103002>] sysenter_past_esp+0x5f/0x85
Jul 17 09:29:40 hlb1 kernel:  =======================


Steps to reproduce: Unsure


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