William Lee Irwin III wrote:
>The NMI oopses are mostly decoded by hand b/c in-kernel (and other)
>backtrace decoders can't do it automatically. I might have to generate
>some fresh data, with some kind of hack (e.g. hand-coded NMI-based kind
>of smp_call_function) to trace the culprit and not just the victim.
>The victims were usually stuck in fork() or exit().
>
Could you check if the attached test app triggers the NMI oopser?
--
Manfred
/* * numados: stress test the tasklist lock. * * Copyright (C) 1999, 2001, 2003 by Manfred Spraul. * All rights reserved except the rights granted by the GPL. * * Redistribution of this file is permitted under the terms of the GNU * General Public License (GPL) version 2 or later. * $Header: /pub/home/manfred/cvs-tree/getdents/getdents.cpp,v 1.1 2003/03/16 21:07:43 manfred Exp $ */
#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <linux/types.h> #include <linux/dirent.h> #include <linux/unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <errno.h>
#define BUFSZ 4096 unsigned char entries[BUFSZ];
#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3) \ type name(type1 arg1,type2 arg2,type3 arg3) \ { \ long __res; \ __asm__ volatile ("int $0x80" \ : "=a" (__res) \ : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \ "d" ((long)(arg3))); \ __syscall_return(type,__res); \ }
_syscall3(int, getdents, uint, fd, struct dirent *, dirp, uint, count);
static void poll_tasklist(void) { int fd, retval;
for (;;) { fd = open("/proc",O_RDONLY); if (fd < 0) { printf("open failed, errno %d.\n", errno); exit(4); } lseek(fd, 1000000, SEEK_SET); retval = getdents(fd, (struct dirent *)entries, BUFSZ); close(fd); } }
int main(int argc, char **argv) { int retval; int forks, readers; int i; printf("numados <forks> <readers>\n"); if (argc != 3) return 1;
forks=atoi(argv[1]); readers=atoi(argv[2]); printf("Forks: %d.\n", forks); for (i=0;i<forks;i++) { retval = fork(); if (retval < 0) { printf("fork failed for process %d, errno %d.\n", i+1, errno); return 2; } else if (retval == 0) { for (;;) sleep(1000); } else { printf(" child %d: pid %d created\n", i, retval); fflush(stdout); } } printf("%d child processes created.\n", i);
for (i=0;i<readers;i++) { retval = fork(); if (retval < 0) { printf("fork failed for process %d, errno %d.\n", i+1, errno); return 3; } else if (retval == 0) { poll_tasklist(); for (;;) sleep(10000); } } printf("%d reader processes created.\n", i); for(;;) sleep(1000); }
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This archive was generated by hypermail 2b29 : Sun Mar 23 2003 - 22:00:20 EST