Date: Wed, 7 Sep 2011 19:19:46 -0400 From: Arnaud Lacombe <lacombar@gmail.com> To: freebsd-net@freebsd.org Cc: Jack Vogel <jfvogel@gmail.com> Subject: Re: FreeBSD 7-STABLE mbuf corruption Message-ID: <CACqU3MXf52tLajTfVCEiGGhtCuXsesrdM65LfsoGecuZj2tNwA@mail.gmail.com> In-Reply-To: <CACqU3MUs9Z9GeuGe=8iVp=MWV6eG-tO%2BkHb1znatsTq2uEqwvA@mail.gmail.com> References: <CACqU3MUs9Z9GeuGe=8iVp=MWV6eG-tO%2BkHb1znatsTq2uEqwvA@mail.gmail.com>
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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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