Date: Tue, 21 Oct 2014 09:36:37 +0200 From: "T.C.Berner" <tcberner@gmail.com> To: araujo@freebsd.org Cc: Rick Macklem <rmacklem@uoguelph.ca>, Allan Jude <allanjude@freebsd.org>, freebsd-current <freebsd-current@freebsd.org> Subject: Re: kernel page fault with nfs Message-ID: <CAOshKtdY7ekU=zoWeR5OJAYszhEWAkpJYk6OD72%2BWoxMyqaKAQ@mail.gmail.com> In-Reply-To: <CAOfEmZgV-455_UHKD-7=E%2B-5zc7b=0WGNJxcMB5J%2B7hS-ozzJw@mail.gmail.com> References: <9401112.gOMxVk2Kpo@noxon.firefly> <527008925.2973263.1413809733207.JavaMail.root@uoguelph.ca> <CAOfEmZgV-455_UHKD-7=E%2B-5zc7b=0WGNJxcMB5J%2B7hS-ozzJw@mail.gmail.com>
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The system now has an uptime of >24h using NFS heavily. So wsize/rsize=2^15-1 seems to have been the problem.... which is imho a bug therefore. mfg Tobias 2014-10-21 5:11 GMT+02:00 Marcelo Araujo <araujobsdport@gmail.com>: > Hello Tibias, > > Any news? > > > Best Regards, > > 2014-10-20 20:55 GMT+08:00 Rick Macklem <rmacklem@uoguelph.ca>: > >> Tobias C. Berner wrote: >> > Now that I posted it, 32767 should of course be 2^15=32768. Let me >> > recheck if it still >> > hangs with the correct value. >> > >> > On Monday 20 October 2014 09.15:39 Tobias C. Berner wrote: >> > > Hi Marcelo >> > > >> > > Yes, I'm using readahead: >> > > The mountoptions are >> > > "readahead=4,soft,intr,rw,tcp,wsize=32767,rsize=32767,late" >> > > >> If you type "nfsstat -m", you will see what is actually getting used. >> (I suspect the above rsize/wsize got clipped to 32256 or something like >> that. I think it clips it to a multiple of 512.) >> >> If rsize/wsize are not a power of 2, there are issues, although I've never >> been able to see why it is broken. Maybe it should clip it to the power of >> 2 below the value, since it causes unexplained problems otherwise. >> >> rick >> >> > > >> > > mfg Tobias >> > > >> > > On Monday 20 October 2014 10.41:30 Marcelo Araujo wrote: >> > > > Hello Tobias, >> > > > >> > > > Could you show how you are mount the NFS share? >> > > > Are you using 'readahead' option? >> > > > >> > > > Best Regards, >> > > > >> > > > 2014-10-19 17:40 GMT+08:00 Tobias C. Berner <tcberner@gmail.com>: >> > > > > both are at 1100038. >> > > > > >> > > > > On Sunday 19 October 2014 11.12:36 Marcelo Araujo wrote: >> > > > > > It is still strange, could you do what Allan said and send us >> > > > > > the >> > > > > > result >> > > > > >> > > > > in >> > > > > >> > > > > > case you are not sure you have world and kernel in the same >> > > > > > revision! >> > > > > > >> > > > > > On Oct 19, 2014 6:48 AM, "Tobias C. Berner" >> > > > > > <tcberner@gmail.com> wrote: >> > > > > > > Hi >> > > > > > > >> > > > > > > World ist from october 16, installed world and kernel then. >> > > > > > > >> > > > > > > Kernel was later rebuilt with debug-options. >> > > > > > > >> > > > > > > >> > > > > > > >> > > > > > > >> > > > > > > >> > > > > > > Is the following more sensible? >> > > > > > > >> > > > > > > >> > ################################################## >> > > > > > > >> > > > > > > # kgdb NOXON/kernel.debug vmcore.1 >> > > > > > > >> > > > > > > Fatal trap 12: page fault while in kernel mode >> > > > > > > >> > > > > > > cpuid = 5; apic id = 05 >> > > > > > > >> > > > > > > fault virtual address = 0xfffffe07d1744000 >> > > > > > > >> > > > > > > fault code = supervisor write data, page not present >> > > > > > > >> > > > > > > instruction pointer = 0x20:0xffffffff80d4d58a >> > > > > > > >> > > > > > > stack pointer = 0x28:0xfffffe086057f240 >> > > > > > > >> > > > > > > frame pointer = 0x28:0xfffffe086057f2f0 >> > > > > > > >> > > > > > > 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 = 6524 (python2.7) >> > > > > > > >> > > > > > > >> > > > > > > >> > > > > > > >> > > > > > > >> > > > > > > (kgdb) bt >> > > > > > > >> > > > > > > #0 doadump (textdump=1) at pcpu.h:219 >> > > > > > > >> > > > > > > #1 0xffffffff80926b6d in kern_reboot (howto=260) at >> > > > > > > /usr/src/sys/kern/kern_shutdown.c:447 >> > > > > > > >> > > > > > > #2 0xffffffff809270c0 in panic (fmt=<value optimized out>) >> > > > > > > at >> > > > > > > /usr/src/sys/kern/kern_shutdown.c:746 >> > > > > > > >> > > > > > > #3 0xffffffff8035f167 in db_panic (addr=<value optimized >> > > > > > > out>, >> > > > > > > have_addr=2, count=0, modif=0x0) at >> > > > > > > /usr/src/sys/ddb/db_command.c:473 >> > > > > > > >> > > > > > > #4 0xffffffff8035ed7d in db_command (cmd_table=0x0) at >> > > > > > > /usr/src/sys/ddb/db_command.c:440 >> > > > > > > >> > > > > > > #5 0xffffffff8035eaf4 in db_command_loop () at >> > > > > > > /usr/src/sys/ddb/db_command.c:493 >> > > > > > > >> > > > > > > #6 0xffffffff80361600 in db_trap (type=<value optimized >> > > > > > > out>, >> > > > > > > code=0) >> > > > > >> > > > > at >> > > > > >> > > > > > > /usr/src/sys/ddb/db_main.c:251 >> > > > > > > >> > > > > > > #7 0xffffffff80966f01 in kdb_trap (type=12, code=0, >> > > > > > > tf=<value >> > > > > > > optimized >> > > > > > > out>) at /usr/src/sys/kern/subr_kdb.c:654 >> > > > > > > >> > > > > > > #8 0xffffffff80d4fa7c in trap_fatal >> > > > > > > (frame=0xfffffe086057f190, >> > > > > >> > > > > eva=<value >> > > > > >> > > > > > > optimized out>) at /usr/src/sys/amd64/amd64/trap.c:861 >> > > > > > > >> > > > > > > #9 0xffffffff80d4fe0c in trap_pfault >> > > > > > > (frame=0xfffffe086057f190, >> > > > > > > usermode=<value optimized out>) at >> > > > > > > /usr/src/sys/amd64/amd64/trap.c:677 >> > > > > > > >> > > > > > > #10 0xffffffff80d4f42e in trap (frame=0xfffffe086057f190) >> > > > > > > at >> > > > > > > /usr/src/sys/amd64/amd64/trap.c:426 >> > > > > > > >> > > > > > > #11 0xffffffff80d33972 in calltrap () at >> > > > > > > /usr/src/sys/amd64/amd64/exception.S:231 >> > > > > > > >> > > > > > > #12 0xffffffff80d4d58a in bzero () at >> > > > > > > /usr/src/sys/amd64/amd64/support.S:53 >> > > > > > > >> > > > > > > #13 0xffffffff80830463 in ncl_doio (vp=0xfffff801e7f99938, >> > > > > > > bp=0xfffffe07c5a168e8, cr=<value optimized out>, td=<value >> > > > > > > optimized >> > > > > >> > > > > out>, >> > > > > >> > > > > > > called_from_strategy=<value optimized out>) >> > > > > > > >> > > > > > > at /usr/src/sys/fs/nfsclient/nfs_clbio.c:1648 >> > _______________________________________________ >> > freebsd-current@freebsd.org mailing list >> > http://lists.freebsd.org/mailman/listinfo/freebsd-current >> > To unsubscribe, send any mail to >> > "freebsd-current-unsubscribe@freebsd.org" >> > >> > > > > -- > > -- > Marcelo Araujo (__)araujo@FreeBSD.org \\\'',)http://www.FreeBSD.org <http://www.freebsd.org/>; \/ \ ^ > Power To Server. .\. /_) > >
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