Date: Mon, 24 May 2010 10:12:10 -0700 From: Pyun YongHyeon <pyunyh@gmail.com> To: John Baldwin <jhb@freebsd.org> Cc: Nikolay Denev <ndenev@gmail.com>, freebsd-stable@freebsd.org Subject: Re: if_sge related panics Message-ID: <20100524171210.GA1418@michelle.cdnetworks.com> In-Reply-To: <201005240948.33555.jhb@freebsd.org> References: <E7AF7DD3-FE50-42DD-8391-0F576708EAF7@gmail.com> <77DFF2E5-7A1E-4063-A852-2C7AD9BC3DD4@gmail.com> <201005240948.33555.jhb@freebsd.org>
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On Mon, May 24, 2010 at 09:48:33AM -0400, John Baldwin wrote: > On Monday 24 May 2010 6:35:01 am Nikolay Denev wrote: > > On May 24, 2010, at 8:57 AM, Nikolay Denev wrote: > > > > > Hi, > > > > > > Recently I started to experience a if_sge(4) related panic. > > > It happens almost every time I try to download a torrent file for example. > > > Copying of large files over NFS seem not to trigger it, but I haven't tested extensively. > > > > > > Here is the panic message : > > > > > > Fatal trap 12: page fault while in kernel mode > > > cpuid = 0; apic id = 00 > > > fault virtual address = 0x8 > > > fault code = supervisor write data, page not present > > > instruction pointer = 0x20:0xffffffff80230413 > > > stack pointer = 0x28:0xffffff80001e9280 > > > frame pointer = 0x28:0xffffff80001e9510 > > > code segment = base 0x0, limit 0xfffff, type 0x1b > > > = DPL 0, pres 1, long 1, def32 0, gran 1 > > > processor eflags = interrupt enabled, resume, IOPL = 0 > > > current process = 12 (irq19: sge0) > > > trap number = 12 > > > panic: page fault > > > cpuid = 0 > > > Uptime: 1d20h56m20s > > > Cannot dump. Device not defined or unavailable > > > Automatic reboot in 15 seconds - press a key on the console to abort > > > Sleeping thread (tid 100039, pid 12) owns a non-sleepable lock > > > > > > My swap is on a zvol, so I don't have dump. I'll try to attach a disk on the eSATA port and dump there if needed. > > > > Here is some info from the crashdump : > > > > (kgdb) #0 doadump () at pcpu.h:223 > > #1 0xffffffff802fb149 in boot (howto=260) > > at /usr/src/sys/kern/kern_shutdown.c:416 > > #2 0xffffffff802fb57c in panic (fmt=0xffffffff8055d564 "%s") > > at /usr/src/sys/kern/kern_shutdown.c:590 > > #3 0xffffffff805055b8 in trap_fatal (frame=0xffffff000288a3e0, eva=Variable "eva" is not available. > > ) > > at /usr/src/sys/amd64/amd64/trap.c:777 > > #4 0xffffffff805059dc in trap_pfault (frame=0xffffff80001e91d0, usermode=0) > > at /usr/src/sys/amd64/amd64/trap.c:693 > > #5 0xffffffff805061c5 in trap (frame=0xffffff80001e91d0) > > at /usr/src/sys/amd64/amd64/trap.c:451 > > #6 0xffffffff804eb977 in calltrap () > > at /usr/src/sys/amd64/amd64/exception.S:223 > > #7 0xffffffff80230413 in sge_start_locked (ifp=0xffffff000270d800) > > at /usr/src/sys/dev/sge/if_sge.c:1591 > > Try this. sge_encap() can sometimes return an error with m_head set to NULL: > Thanks John. Committed in r208512. > Index: if_sge.c > =================================================================== > --- if_sge.c (revision 208375) > +++ if_sge.c (working copy) > @@ -1588,7 +1588,8 @@ > if (m_head == NULL) > break; > if (sge_encap(sc, &m_head)) { > - IFQ_DRV_PREPEND(&ifp->if_snd, m_head); > + if (m_head != NULL) > + IFQ_DRV_PREPEND(&ifp->if_snd, m_head); > ifp->if_drv_flags |= IFF_DRV_OACTIVE; > break; > } > > -- > John Baldwin
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