Gentoo Websites Logo
Go to: Gentoo Home Documentation Forums Lists Bugs Planet Store Wiki Get Gentoo!
Bug 519770 - sys-kernel/gentoo-sources-3.15.6 - BUG: unable to handle kernel paging request at file_free_rcu()
Summary: sys-kernel/gentoo-sources-3.15.6 - BUG: unable to handle kernel paging reques...
Status: RESOLVED TEST-REQUEST
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: [OLD] Core system (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Kernel Bug Wranglers and Kernel Maintainers
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2014-08-13 01:20 UTC by Timothy Miller
Modified: 2015-01-02 19:16 UTC (History)
0 users

See Also:
Package list:
Runtime testing required: ---


Attachments
Screen photo of panic (panicphoto.jpg,940.69 KB, image/jpeg)
2014-08-15 02:19 UTC, Timothy Miller
Details

Note You need to log in before you can comment on or make changes to this bug.
Description Timothy Miller 2014-08-13 01:20:52 UTC
I regularly get kernel panics.  Some of them are clearly related to btrfs, which is really unstable in software RAID1 configurations.  But sometimes I get ones that appear unrelated, such as fairly regular panics related to rcu.

A screen shot of the panic can be found at:  http://i.imgur.com/GFZ1gSq.jpg

My kernel config is attached.  The kernel version is 3.15.6-gentoo.

When I disassemble at the location of the panic, I get this:

(gdb) disas /m file_free_rcu
Dump of assembler code for function file_free_rcu:
   0xffffffff8111f0e0 <+0>: push   %rbx
   0xffffffff8111f0e1 <+1>: mov    %rdi,%rbx
   0xffffffff8111f0e4 <+4>: mov    0xa0(%rdi),%rdi
   0xffffffff8111f0eb <+11>: lock decl (%rdi)
   0xffffffff8111f0ee <+14>: je     0xffffffff8111f100 <file_free_rcu+32>
   0xffffffff8111f0f0 <+16>: mov    0x8d2f69(%rip),%rdi        # 0xffffffff819f2060 <filp_cachep>
   0xffffffff8111f0f7 <+23>: mov    %rbx,%rsi
   0xffffffff8111f0fa <+26>: pop    %rbx
   0xffffffff8111f0fb <+27>: jmpq   0xffffffff81119db0 <kmem_cache_free>
   0xffffffff8111f100 <+32>: callq  0xffffffff81061e10 <__put_cred>
   0xffffffff8111f105 <+37>: mov    %rbx,%rsi
   0xffffffff8111f108 <+40>: mov    0x8d2f51(%rip),%rdi        # 0xffffffff819f2060 <filp_cachep>
   0xffffffff8111f10f <+47>: pop    %rbx
   0xffffffff8111f110 <+48>: jmpq   0xffffffff81119db0 <kmem_cache_free>
End of assembler dump.


So the panic is at a "lock decl" instruction.  I don't know why, but CONFIG_DEBUG_INFO isn't set, so I can't match them up line for line, but here's the source:

static void file_free_rcu(struct rcu_head *head)
{
        struct file *f = container_of(head, struct file, f_u.fu_rcuhead);

        put_cred(f->f_cred);
        kmem_cache_free(filp_cachep, f);
}
Comment 1 Timothy Miller 2014-08-13 01:37:22 UTC
The "lock decl" is in atomic_dec_and_test, which is inside of put_cred.
Comment 2 Jeroen Roovers (RETIRED) gentoo-dev 2014-08-13 15:24:20 UTC
1) Please post your `emerge --info' output in a comment.
2) Please attach all relevant files /directly/ to this bug report.
Comment 3 Timothy Miller 2014-08-15 02:14:43 UTC
=================================================================
System uname: Linux-3.16.0-gentoo-x86_64-Intel-R-_Core-TM-_i5-4430_CPU_@_3.00GHz-with-gentoo-2.2
KiB Mem:     8020420 total,    477304 free
KiB Swap:   33554428 total,  33554428 free
Timestamp of tree: Thu, 14 Aug 2014 07:00:01 +0000
ld GNU ld (Gentoo 2.24 p1.4) 2.24
app-shells/bash:          4.2_p47
dev-lang/python:          2.7.8, 3.3.5-r1, 3.4.1
dev-util/cmake:           2.8.12.2-r1
dev-util/pkgconfig:       0.28-r2
sys-apps/baselayout:      2.2
sys-apps/openrc:          0.12.4
sys-apps/sandbox:         2.6-r1
sys-devel/autoconf:       2.69
sys-devel/automake:       1.11.6, 1.14.1
sys-devel/binutils:       2.24-r3
sys-devel/gcc:            4.8.3
sys-devel/gcc-config:     1.8
sys-devel/libtool:        2.4.2-r1
sys-devel/make:           4.0-r1
sys-kernel/linux-headers: 3.16 (virtual/os-headers)
sys-libs/glibc:           2.19-r1
Repositories: gentoo
ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="*"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -march=native -ggdb -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c"
CXXFLAGS="-O2 -march=native -ggdb -pipe"
DISTDIR="/usr/portage/distfiles"
EMERGE_DEFAULT_OPTS="--jobs=4"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms splitdebug strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="rsync://mirror.mcs.anl.gov/gentoo/ rsync://rsync.gtlib.gatech.edu/gentoo rsync://mirrors.rit.edu/gentoo/ http://gentoo.osuosl.org/ http://gentoo.netnitco.net http://mirror.csclub.uwaterloo.ca/gentoo-distfiles/ ftp://mirror.datapipe.net/gentoo ftp://mirror.csclub.uwaterloo.ca/gentoo-distfiles/ http://gentoo.mirrors.easynews.com/linux/gentoo/ ftp://ftp.free.fr/mirrors/ftp.gentoo.org/ ftp://gentoo.imj.fr/pub/gentoo/ ftp://distro.ibiblio.org/pub/linux/distributions/gentoo/"
LANG="en_US.UTF-8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="--jobs=2"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_EXTRA_OPTS="-4"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY=""
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="X a52 acl ads amd64 avahi avi avx avx256 berkdb bzip2 cairo caps caps-ng cli cpumining cracklib crypt cxx dbus divx dri dv dvd dvdread encode fame fortran gdbm iconv ipv6 jpeg keymap kvm ldap lm_sensors mjpeg mmx modules mp3 mpeg multilib ncurses nls nptl ogg openmp pam parse-clocks pcre png python quicktime readline session sse sse2 sse3 ssl subtitles tcpd unicode upcall vorbis winbind xvid zlib" ABI_X86="64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="en en_US" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-3 php5-4" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_3" QEMU_SOFTMMU_TARGETS="i386 x86_64" QEMU_USER_TARGETS="i386 x86_64" RUBY_TARGETS="ruby19 ruby20 ruby21" USERLAND="GNU" VIDEO_CARDS="intel" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"
Unset:  CPPFLAGS, CTARGET, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, USE_PYTHON
Comment 4 Timothy Miller 2014-08-15 02:19:06 UTC
Created attachment 382912 [details]
Screen photo of panic
Comment 5 Mike Pagano gentoo-dev 2014-10-23 23:23:13 UTC
Is this still an issue with later kernels?