Hello. > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=12409 > Subject : NULL pointer dereference at get_stats() > Submitter : Tetsuo Handa <[email protected]> > Date : 2008-12-30 12:53 (21 days old) > References : http://marc.info/?l=linux-kernel&m=123064167008695&w=4 > Handled-By : Frederik Deweerdt <[email protected]>
I made custom initramfs and tested on native environment and KVM and VMware. This problem happened only in VMware. Alok and Daniel (cc: added), can you reproduce this problem? Problem description: Compiling 2.6.28.4 using config at http://I-love.SAKURA.ne.jp/tmp/config-2.6.28-bug and booting with "nolapic" option on x86 machine with 2 CPUs, NULL pointer dereference happens at get_stats() because for_each_possible_cpu() reaches CPU 1 while "nolapic" option should prevent for_each_possible_cpu() from reaching CPU 1. Compiling 2.6.28.4 using config at http://I-love.SAKURA.ne.jp/tmp/config-2.6.28-nobug (all options in "Power management and ACPI options" section disabled) solves this problem. Also, this problem seems to be VMware specific. I couldn't reproduce this problem on native environment and KVM. Native environment (no problem): CentOS 5.2 (x86_64) and Ubuntu 8.04 (i386) on ThinkPad X60 KVM environment (no problem): kvm -kernel /boot/vmlinuz-2.6.28.4 -initrd /boot/init -net none -hda /var/tmp/image.img -vnc xx.xx.xx.xx:0 --append "ro nolapic" -smp 2 on Ubuntu 8.04 (i386) on ThinkPad X60 VMware environment (problematic): Debian Sarge (i386) / CentOS 5.2 (i386) on VMware workstation 6.5.1 (x86_64) on CentOS 5.2 (x86_64) on ThinkPad X60 Problematic kernel versions: 2.6.27.x and 2.6.28.x . Regards. ----- Custom initramfs ----- /* gcc -Wall -O3 -static -o init init.c echo init | cpio -o -H newc | gzip -9 > /boot/init */ #include <sys/mount.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <stdio.h> #include <string.h> int main(int argc, char *argv[]) { FILE *fp; char buffer[1024]; memset(buffer, 0, sizeof(buffer)); mkdir("/proc", 0755); mount("none", "/proc", "proc", 0, NULL); fp = fopen("/proc/cpuinfo", "r"); while (fgets(buffer, sizeof(buffer) - 1, fp)) if (strstr(buffer, "processor")) printf("%s", buffer); fclose(fp); fp = fopen("/proc/cmdline", "r"); fgets(buffer, sizeof(buffer) - 1, fp); fclose(fp); printf("%s", buffer); fflush(stdout); if (mkdir("/sys", 0755) || mount("/sys/", "/sys/", "sysfs", 0, NULL)) { printf("mount failed\n"); while (1) sleep(1); } fp = fopen("/sys/class/net/lo/statistics/rx_packets", "r"); if (!fp) { printf("open failed\n"); while (1) sleep(1); } while (fgets(buffer, sizeof(buffer) - 1, fp)) ; fclose(fp); printf("done\n"); while (1) sleep(1); return 0; } -- To unsubscribe from this list: send the line "unsubscribe kernel-testers" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
