Re: (beagleboneblack/urtwn) Kernel page fault with the following non-sleepable locks held [ssh on rpi2 comparison]

From: Mark Millard <markmi_at_dsl-only.net>
Date: Tue, 21 Jun 2016 04:14:11 -0700
On 2016-Jun-21, at 3:33 AM, Keith White <kwhite at site.uottawa.ca> wrote:

> On Tue, 21 Jun 2016, Mark Millard wrote:
> 
>> OtacĂ­lio otacilio.neto at bsd.com.br wrote on Tue Jun 21 00:06:39 UTC 2016 :
>> 
>>> > The kernel panic is totally reproducible. I need only do a ssh in the
>>> > beaglebone using ptty on windows or ssh on freebsd and the kernel > panic is raised.
>> . . .
>>> FreeBSD11-ALPHA4 shows the same behavior. The only thing that I need to raise the fault is ssh in the beaglebone.
>> 
>> (After this quotes are command input/output from my test activity.)
>> 
>> Under 11.0 -r310975 on a rpi2 I can ssh out of the rpi2 just fine. . .
>> 
>>> # uname -apKU
>>> FreeBSD rpi2 11.0-ALPHA4 FreeBSD 11.0-ALPHA4 #1 r301975M: Thu Jun 16 18:12:02 PDT 2016     markmi_at_FreeBSDx64:/usr/obj/clang/arm.armv6/usr/src/sys/RPI2-NODBG  arm armv6 1100117 1100117
>> 
>> 
>> This is a no-debug kernel build (but with symbols). Details are given later below.
>> 
>>> # ssh markmi_at_192.168.0.105
>>> Password:
>>> Last login: Tue Jun 21 01:04:46 2016
>>> markmi$ 
>> 
>> Similarly I can ssh into the rpi2 from outside, here using new remote connection in Mac OS X terminal: ssh 192.168.0.119 resulted in. . .
>> 
>>> Password for markmi_at_rpi2:
>>> Last login: Mon May  9 19:27:33 2016 from 192.168.2.1
>>> FreeBSD 11.0-ALPHA4 (RPI2-NODBG) #1 r301975M: Thu Jun 16 18:12:02 PDT 2016
>>> Welcome to FreeBSD!
>>> Release Notes, Errata: https://www.FreeBSD.org/releases/
>>> Security Advisories:   https://www.FreeBSD.org/security/
>>> FreeBSD Handbook:      https://www.FreeBSD.org/handbook/
>>> FreeBSD FAQ:           https://www.FreeBSD.org/faq/
>>> Questions List: https://lists.FreeBSD.org/mailman/listinfo/freebsd-questions/
>>> FreeBSD Forums:        https://forums.FreeBSD.org/
>>> Documents installed with the system are in the /usr/local/share/doc/freebsd/
>>> directory, or can be installed later with:  pkg install en-freebsd-doc
>>> For other languages, replace "en" with a language code like de or fr.
>>> Show the version of FreeBSD installed:  freebsd-version ; uname -a
>>> Please include that output and any error messages when posting questions.
>>> Introduction to manual pages:  man man
>>> FreeBSD directory layout:      man hier
>>> Edit /etc/motd to change this login announcement.
>>> To determine whether a file is a text file, executable, or some other type
>>> of file, use
>>> 
>>> 	file filename
>>> 		-- Dru <genesis_at_istar.ca>
>>> $ 
>> 
>> No panics or other odd notices.
>> 
>> The problem is apparently not general to all armv6 contexts.
>> 
>> Various context details follow. . .
>> 
>>> # more ~/src.configs/src.conf.rpi2-clang-bootstrap.rpi2-host TO_TYPE=armv6
>>> #
>>> KERNCONF=RPI2-NODBG
>>> TARGET=arm
>>> .if ${.MAKE.LEVEL} == 0
>>> TARGET_ARCH=${TO_TYPE}
>>> .export TARGET_ARCH
>>> .endif
>>> #
>>> #WITH_CROSS_COMPILER=
>>> WITH_SYSTEM_COMPILER=
>>> #
>>> #CPUTYPE=soft
>>> WITH_LIBSOFT=
>>> WITH_LIBCPLUSPLUS=
>>> WITH_BINUTILS_BOOTSTRAP=
>>> #WITHOUT_CLANG_BOOTSTRAP=
>>> WITH_CLANG=
>>> WITH_CLANG_IS_CC=
>>> WITH_CLANG_FULL=
>>> WITH_CLANG_EXTRAS=
>>> WITH_LLDB=
>>> #
>>> WITH_BOOT=
>>> WITHOUT_LIB32=
>>> #
>>> WITHOUT_ELFTOOLCHAIN_BOOTSTRAP=
>>> WITHOUT_GCC_BOOTSTRAP=
>>> WITHOUT_GCC=
>>> WITHOUT_GCC_IS_CC=
>>> WITHOUT_GNUCXX=
>>> #
>>> NO_WERROR=
>>> #WERROR=
>>> MALLOC_PRODUCTION=
>>> #
>>> WITH_DEBUG_FILES=
>>> #
>>> XCFLAGS+= -march=armv7-a -mcpu=cortex-a7
>>> XCXXFLAGS+= -march=armv7-a -mcpu=cortex-a7
>>> # There is no XCPPFLAGS but XCPP ets XCFLAGS content.
>> 
>> ~/src.configs/make.conf was empty.
>> 
>>> # more /usr/src/sys/arm/conf/RPI2-NODBG
>>> #
>>> # RPI2 -- Custom configuration for the Raspberry Pi 2
>>> #
>>> # For more information on this file, please read the config(5) manual page,
>>> # and/or the handbook section on Kernel Configuration Files:
>>> #
>>> #    http://www.FreeBSD.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig-config.html
>>> #
>>> # The handbook is also available locally in /usr/share/doc/handbook
>>> # if you've installed the doc distribution, otherwise always see the
>>> # FreeBSD World Wide Web server (http://www.FreeBSD.org/) for the
>>> # latest information.
>>> #
>>> # An exhaustive list of options and more detailed explanations of the
>>> # device lines is also present in the ../../conf/NOTES and NOTES files.
>>> # If you are in doubt as to the purpose or necessity of a line, check first
>>> # in NOTES.
>>> #
>>> ident           RPI2-NODBG
>>> include         "RPI2"
>>> makeoptions     DEBUG=-g                # Build kernel with gdb(1) debug symbols
>>> options         ALT_BREAK_TO_DEBUGGER
>>> #options        VERBOSE_SYSINIT         # Enable verbose sysinit messages
>>> options         KDB                     # Enable kernel debugger support
>>> # For minimum debugger support (stable branch) use:
>>> #options        KDB_TRACE               # Print a stack trace for a panic
>>> options         DDB                     # Enable the kernel debugger
>>> nooptions       INVARIANTS              # Enable calls of extra sanity checking
>>> nooptions       INVARIANT_SUPPORT       # Extra sanity checks of internal structures, required by INVARIANTS
>>> nooptions       WITNESS                 # Enable checks to detect deadlocks and cycles
>>> nooptions       WITNESS_SKIPSPIN        # Don't run witness on spinlocks for speed
>>> nooptions       DIAGNOSTIC
>> 
>> 
>> My /usr/src tree has some changes/additions --but mostly for powerpc64 and powerpc issues:
>> 
>>> # svnlite status /usr/src/
>>> M       /usr/src/contrib/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
>>> M       /usr/src/lib/csu/powerpc64/Makefile
>>> ?       /usr/src/sys/amd64/include/include
>>> ?       /usr/src/sys/arm/conf/RPI2-NODBG
>>> ?       /usr/src/sys/arm/include/include
>>> M       /usr/src/sys/boot/ofw/Makefile.inc
>>> M       /usr/src/sys/boot/powerpc/Makefile
>>> M       /usr/src/sys/boot/powerpc/Makefile.inc
>>> M       /usr/src/sys/boot/uboot/Makefile.inc
>>> M       /usr/src/sys/conf/Makefile.powerpc
>>> M       /usr/src/sys/conf/kern.mk
>>> M       /usr/src/sys/conf/kmod.mk
>>> M       /usr/src/sys/dev/cxgb/ulp/tom/cxgb_listen.c
>>> M       /usr/src/sys/dev/cxgbe/tom/t4_listen.c
>>> ?       /usr/src/sys/powerpc/conf/GENERIC64-NODBG
>>> ?       /usr/src/sys/powerpc/conf/GENERIC64vtsc
>>> ?       /usr/src/sys/powerpc/conf/GENERIC64vtsc-NODEBUG
>>> ?       /usr/src/sys/powerpc/conf/GENERICvtsc
>>> ?       /usr/src/sys/powerpc/conf/GENERICvtsc-NODEBUG
>>> ?       /usr/src/sys/powerpc/include/include
>>> M       /usr/src/sys/powerpc/ofw/ofw_machdep.c
>>> M       /usr/src/sys/powerpc/powerpc/exec_machdep.c
>>> ?       /usr/src/sys/x86/include/include
>> 
>> (The include/include ones are from something making links pointing back up to the parent include/ . I did not explicitly create these.)
>> 
>> (The cxbg and cxbge ones were from trying to have amd64 target amd64 via xtoolchain (devel/amd64-gcc). But other places also stopped it and I quit trying that for now.)
>> 
>>> # more /etc/rc.conf
>>> hostname="rpi2"
>>> ifconfig_ue0="DHCP"
>>> sshd_enable="YES"
>>> powerd_enable="YES"
>>> # Nice if you have a network, else annoying.
>>> ntpd_enable="YES"
>>> ntpd_sync_on_start="YES"
>>> # Uncomment to disable common services (more memory)
>>> #cron_enable="NO"
>>> #syslogd_enable="NO"
>>> sendmail_enable="NONE"
>>> sendmail_submit_enable="NO"
>>> sendmail_outbound_enable="NO"
>>> sendmail_msp_queue_enable="NO"
>>> #
>>> # Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable
>>> dumpdev="AUTO"
>>> #
>>> dbus_enable="YES"
>>> hald_enable="YES"
>>> #
>>> rpcbind_enable="YES"
>>> nfs_server_enable="YES"
>>> mountd_flags="-r"
>>> #
>>> nfs_client_enable="YES"
>> 
>>> # more /etc/sysctl.conf # $FreeBSD: head/etc/sysctl.conf 112200 2003-03-13 18:43:50Z mux $
>>> #
>>> #  This file is read when going to multi-user and its contents piped thru
>>> #  ``sysctl'' to adjust kernel values.  ``man 5 sysctl.conf'' for details.
>>> #
>>> # Uncomment this to prevent users from seeing information about processes that
>>> # are being run under another UID.
>>> #security.bsd.see_other_uids=0
>>> kern.nodump_coredump=1
>>> kern.capmode_coredump=1
>>> kern.sugid_coredump=1
>>> kern.corefile=/var/crash/%N.%P.core
>> 
>> 
>> /etc/fstab , /etc/exports , /etc/resolv.conf are very simple but non-default. Other than password files and the like the rest of /etc/. . . is just defaults.
>> 
>>> # more /boot/loader.conf kern.cam.boot_delay="10000"
>> 
>> 
>> 
>> 
>> ===
>> Mark Millard
>> markmi at dsl-only.net
>> 
>> _______________________________________________
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>> https://lists.freebsd.org/mailman/listinfo/freebsd-arm
>> To unsubscribe, send any mail to "freebsd-arm-unsubscribe_at_freebsd.org"
> 
> I'm using an RPI-B rather than RPI2, but my symptoms are similar.
> 
> Did you use the wired or wireless interface on the RPI2?  I only
> get the panic on the RPI-B when using wireless.  Wired works fine.

My context is/was wired (ue0 --as in ifconfig_ue0="DHCP"), not wireless.

> In an earlier message Ian said that he thought he knew what the
> problem was...
> 
> ...keith

===
Mark Millard
markmi at dsl-only.net
Received on Tue Jun 21 2016 - 09:14:20 UTC

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