After booting, I got segmentation fault when issuing command "sysctl -a". The last several lines of output is: dev.cdrom.info = dev.cdrom.info = dev.rtc.max-user-freq = 64 dev.scsi.logging_level = 0 Segmentation fault This problem is gone when I do rmmod ath_pci and even after modprobe ath_pci. The ath_pci module is loaded by hotplug I think. Reproducible: Always Steps to Reproduce: 1. after boot, sysctl -a gives segmentation fault. 2. rmmod ath_pci, the problem is gone. 3. modprobe ath_pci, we don't have problem either. emerge info Portage 2.0.51.22-r2 (default-linux/x86/2005.0, gcc-3.3.5-20050130, glibc-2.3.5-r0, 2.6.12-gentoo-r6 i686) ================================================================= System uname: 2.6.12-gentoo-r6 i686 Intel(R) Pentium(R) M processor 1600MHz Gentoo Base System version 1.6.13 distcc 2.18.3 i686-pc-linux-gnu (protocols 1 and 2) (default port 3632) [enabled] ccache version 2.3 [enabled] dev-lang/python: 2.3.5 sys-apps/sandbox: 1.2.11 sys-devel/autoconf: 2.13, 2.59-r6 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.5 sys-devel/binutils: 2.15.92.0.2-r10 sys-devel/libtool: 1.5.18-r1 virtual/os-headers: 2.6.11-r2 ACCEPT_KEYWORDS="x86" AUTOCLEAN="yes" CBUILD="i686-pc-linux-gnu" CFLAGS="-O3 -march=pentium3 -pipe -mfpmath=sse -fomit-frame-pointer" CHOST="i686-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3.4/env /usr/kde/3.4/share/config /usr/kde/3.4/shutdown /usr/kde/3/share/config /usr/lib/X11/xkb /usr/lib/mozilla/defaults/pref /usr/share/config /usr/share/texmf/dvipdfm/config/ /usr/share/texmf/dvips/config/ /usr/share/texmf/tex/generic/config/ /usr/share/texmf/tex/platex/config/ /usr/share/texmf/xdvi/ /var/qmail/control" CONFIG_PROTECT_MASK="/etc/gconf /etc/splash /etc/terminfo /etc/env.d" CXXFLAGS="-O2 -mcpu=i686 -pipe" DISTDIR="/usr/portage/distfiles" FEATURES="autoconfig ccache distcc distlocks fixpackages sandbox sfperms strict" GENTOO_MIRRORS="http://csociety-ftp.ecn.purdue.edu/pub/gentoo/ http://gentoo.chem.wisc.edu/gentoo/ http://distfiles.gentoo.org http://www.ibiblio.org/pub/Linux/distributions/gentoo" LANG="en_US.utf8" LINGUAS="en zh_CN zh_TW" MAKEOPTS="-j4" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage" SYNC="rsync://rsync.namerica.gentoo.org/gentoo-portage" USE="x86 X Xaw3d aac aalib acpi alsa apache2 apm arts atlas avi bash-completion berkdb bitmap-fonts bluetooth bonobo bzlib cdr cjk crypt cups curl dga divx4linux dvd eds emacs emboss encode esd fam fbcon fftw flac foomaticdb fortran gcj gd gdbm gif ginac gnome gnutls gphoto2 gpm gstreamer gtk gtk2 gtkhtml guile hal howl ieee1394 imagemagick imap imlib ipv6 java javascript jpeg junit kde kerberos ldap leim libg++ libwww lirc mad maildir mikmod mime mmx mng motif mozilla mp3 mpeg mule mysql nas ncurses nls nptl ofx ogg oggvorbis opengl oss pam pcmcia pcre pdflib perl php pic plotutils png posix ppds python qt quicktime readline samba sasl sdl slang sndfile speex spell sse ssl svg svga tcltk tcpd tetex tiff truetype truetype-fonts type1-fonts unicode usb vorbis wifi win32codecs wmf xine xml xml2 xmms xosd xprint xv xvid zlib video_cards_radeon linguas_en linguas_zh_CN linguas_zh_TW userland_GNU kernel_linux elibc_glibc" Unset: ASFLAGS, CTARGET, LC_ALL, LDFLAGS
The following is the output of "sysctl -a" after rmmod ath_pci and modprobe ath_pci. (Only the part that is relevant.) dev.cdrom.info = dev.cdrom.info = dev.rtc.max-user-freq = 64 dev.scsi.logging_level = 0 net.wlan.ath0.scan_table = net.wlan.ath0.scan_table = macaddr: <00:05:4e:42:17:d9> net.wlan.ath0.scan_table = BSS net.wlan.ath0.scan_table = rssi: 0 dBm ;refcnt: 2 net.wlan.ath0.scan_table = capinfo: net.wlan.ath0.scan_table = freq: 2427 MHz (channel 4) net.wlan.ath0.scan_table = opmode: b net.wlan.ath0.scan_table = txrate: 0 ? (rs_nrates: 0) net.wlan.ath0.scan_table = txpower 34 vlan 0 net.wlan.ath0.scan_table = txseq: 0 rxseq: 0 fragno 0 rxfragstamp 0 net.wlan.ath0.scan_table = fails: 0 inact: 65266 net.wlan.ath0.debug = 0
post your sysctl.conf file and see if you can narrow down only the lines that are required to make it crash
cat /etc/sysctl.conf | sed -e /^#/d net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.all.rp_filter = 1 kernel.sysrq = 1 kernel.panic = 3 vm.swappiness = 0
And this is the output of dmesg when segmentation fault happened. Unable to handle kernel paging request at virtual address 0000ffff printing eip: f9b996ce *pde = 00000000 Oops: 0000 [#1] Modules linked in: radeon drm pcmcia ipt_LOG ipt_state ipt_limit iptable_filter iptable_nat ip_conntrack iptable_mangle ip_tables snd_pcm_oss snd_mixer_oss snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device hci_usb ath_pci ath_rate_sample wlan ath_hal e1000 yenta_socket rsrc_nonstatic pcmcia_core snd_intel8x0 snd_ac97_codec snd_pcm snd_timer snd snd_page_alloc fuse ppp_generic slhc shfs cdemu intel_agp agpgart usblp ata_piix sata_via sata_svw sata_promise libata sbp2 ohci1394 ieee1394 ohci_hcd uhci_hcd usb_storage usbhid ehci_hcd usbcore CPU: 0 EIP: 0060:[<f9b996ce>] Tainted: P VLI EFLAGS: 00010286 (2.6.12-gentoo-r6) EIP is at proc_read_node+0x15e/0x610 [wlan] eax: 0000ffff ebx: f28eff44 ecx: f9b9eab0 edx: 00000000 esi: f28efb3a edi: f7f65000 ebp: f9b9ea87 esp: f28efad8 ds: 007b es: 007b ss: 0068 Process sysctl (pid: 26584, threadinfo=f28ee000 task=d3ee2a40) Stack: f28efb39 00000000 00000002 c01929b3 f28efccc 00000064 000002d4 63616d0a 72646461 303c203a 35303a30 3a65343a 313a3234 39643a37 53420a3e 20200a53 69737372 2030203a 206d4264 6665723b 3a746e63 200a3220 70616320 6f666e69 Call Trace: [<c01929b3>] balance_leaf+0x3083/0x30a0 [<c01ab295>] pathrelse_and_restore+0x45/0x50 [<c01a22cb>] unfix_nodes+0x9b/0x180 [<c013b2c2>] buffered_rmqueue+0x142/0x1d0 [<c013b6e3>] __alloc_pages+0x2e3/0x430 [<c013b2c2>] buffered_rmqueue+0x142/0x1d0 [<c0145a5e>] do_anonymous_page+0xfe/0x150 [<c013b2c2>] buffered_rmqueue+0x142/0x1d0 [<c013b6e3>] __alloc_pages+0x2e3/0x430 [<c013b2c2>] buffered_rmqueue+0x142/0x1d0 [<c0145a5e>] do_anonymous_page+0xfe/0x150 [<c0116638>] recalc_task_prio+0x88/0x150 [<c0116762>] activate_task+0x62/0x80 [<c0182dbd>] proc_alloc_inode+0x4d/0x80 [<c016c58b>] alloc_inode+0x1b/0x140 [<c016d0dd>] get_new_inode_fast+0x3d/0x110 [<c0182d47>] proc_read_inode+0x17/0x40 [<c0182f31>] proc_get_inode+0xf1/0x130 [<c016be6a>] d_rehash+0x4a/0x60 [<c0185bba>] proc_lookup+0x7a/0xc0 [<c01613d1>] real_lookup+0xc1/0xf0 [<c01616c0>] do_lookup+0x50/0xb0 [<c016206b>] __link_path_walk+0x94b/0xbf0 [<c016236a>] link_path_walk+0x5a/0xe0 [<c015dba7>] sys_stat64+0x37/0x40 [<c0297792>] copy_to_user+0x42/0x60 [<c015db58>] cp_new_stat64+0xf8/0x110 [<f9b99cae>] ieee80211_sysctl_scan+0x7e/0x90 [wlan] [<c011fe19>] do_rw_proc+0xa9/0xc0 [<c011fe7f>] proc_readsys+0x2f/0x40 [<c0153d76>] vfs_read+0xb6/0x180 [<c0154101>] sys_read+0x51/0x80 [<c0102f3f>] sysenter_past_esp+0x54/0x75 Code: 03 00 00 f6 c4 20 0f 85 71 03 00 00 89 34 24 b9 af ea b9 f9 89 4c 24 04 e8 60 d1 6f c6 31 d2 01 c6 89 54 24 04 8b 87 28 01 00 00 <0f> b7 00 89 04 24 e8 77 d3 fe ff 89 44 24 0c 8b 87 28 01 00 00
Adding solar and horton to CC: as this seems to be related to the madwifi driver.
The problem is gone after downgrading to madwifi-driver-0.1_pre20050420
Closing as UPSTREAM since madwifi-driver-0.1_pre20050809 seems to be utterly broken. You might want to test with a recent cvs snapshot and report the problem upstream, if it still exists.
Which branch do you recommend me to try? the main branch or the bsd branch? I am no t sure which one is corresponding to the madwifi-driver ebuild.
