Date: Wed, 7 Sep 2011 16:57:17 -0700 From: Jack Vogel <jfvogel@gmail.com> To: Arnaud Lacombe <lacombar@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: FreeBSD 7-STABLE mbuf corruption Message-ID: <CAFOYbc=mu7rGU8LudLSzZwKfM3QHFw%2BPGEHHKD3rcA2=dxGfoQ@mail.gmail.com> In-Reply-To: <CACqU3MXf52tLajTfVCEiGGhtCuXsesrdM65LfsoGecuZj2tNwA@mail.gmail.com> References: <CACqU3MUs9Z9GeuGe=8iVp=MWV6eG-tO%2BkHb1znatsTq2uEqwvA@mail.gmail.com> <CACqU3MXf52tLajTfVCEiGGhtCuXsesrdM65LfsoGecuZj2tNwA@mail.gmail.com>
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I have seen this, but I don't have any hot ideas right off the top of my head yet :( Jack On Wed, Sep 7, 2011 at 4:19 PM, Arnaud Lacombe <lacombar@gmail.com> wrote: > Hi, > > On Mon, Sep 5, 2011 at 2:59 AM, Arnaud Lacombe <lacombar@gmail.com> wrote: > > Hi folks, > > > > We have been trying to track down a bad mbuf management for about two > > weeks on a customized 7.1 base. I have finally been able to reproduce > > it with a stock FreeBSD 7-STABLE (kernel from r225276, userland from > > 7.4). > > > > With the help of the attached patches, I have just been able to > > trigger the following panic: > > > > panic: Corrupted unused flags, expected 0xffffffff00000000, got 0x0, > flags 0x3 > > cpuid = 1 > > Uptime: 3d10h5m3s > > Cannot dump. No dump device defined > > > General form of the crash is: > > panic: Corrupted unused flags, expected 0xffffffff00000000, got > 0xbabe0000000000, flags 0xbabe0000babe00 > cpuid = 0 > KDB: stack backtrace: > db_trace_self_wrapper(c0874e29,0,c0835757,f4574c48,0,...) at > db_trace_self_wrapper+0x26 > panic(c0835757,0,ffffffff,0,babe00,...) at panic+0x10b > igb_txeof(c6a25008,0,c0837083,5ea,17c,...) at igb_txeof+0x399 > igb_msix_que(c6a2b800,0,c084d367,4b6,c69dd068,...) at igb_msix_que+0x7b > ithread_loop(c6a29090,f4574d38,c084d0db,31c,c6a16828,...) at > ithread_loop+0xc3 > fork_exit(c061d520,c6a29090,f4574d38) at fork_exit+0xa6 > fork_trampoline() at fork_trampoline+0x8 > --- trap 0, eip = 0, esp = 0xf4574d70, ebp = 0 --- > Uptime: 1m42s > > It happens particularly easily when the box receives wall of SYN > (about 1000 cnx attempts at once) every 5s or so. > > - Arnaud > > > > > [cut stuff no one cares about...] >
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