Messages in this thread | | | Date | Fri, 15 Aug 2008 17:50:43 +0200 | From | "Vegard Nossum" <> | Subject | Re: 2.6.25.11-97.fc9 (P): idr_remove called for id=236 which is not allocated |
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On Fri, Aug 15, 2008 at 5:28 PM, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote: >> ida_remove called for id=112 which is not allocated. >> ida_remove called for id=67 which is not allocated. >> ida_remove called for id=191 which is not allocated. >> ida_remove called for id=23 which is not allocated. >> >> ..and with no backtrace, so I guess it means "not harmful". Sorry for the noise. > > Thats definitely not good and wants digging into further. >
Okay!
I've attached my program. On 2.6.27-rc3 the message appears at least a couple of times per second, so you should have no trouble in reproducing it. On the 2.6.25 I get it maybe once a minute.
Compile with: gcc -std=gnu99
Vegard
-- "The animistic metaphor of the bug that maliciously sneaked in while the programmer was not looking is intellectually dishonest as it disguises that the error is the programmer's own creation." -- E. W. Dijkstra, EWD1036 #include <sys/mman.h> #include <sys/stat.h> #include <sys/types.h>
#include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <time.h> #include <unistd.h>
#ifdef CONFIG_LOGGING static FILE *logfile; #endif
static const char *devname = "/tmp/dev";
static void do_one(mode_t mode, unsigned int maj, unsigned int min) { #if CONFIG_LOGGING fprintf(logfile, "%d, %d\n", maj, min); fflush(logfile); fsync(fileno(logfile)); #endif
if (mknod(devname, mode | 0644, makedev(maj, min)) == -1) return;
int fd = open(devname, O_RDONLY, 0644); if (fd == -1) goto ret_mknod;
char *ptr = mmap(NULL, getpagesize(), PROT_READ, MAP_SHARED | MAP_ANONYMOUS, fd, 0); if (ptr == MAP_FAILED) goto ret_open;
munmap(ptr, getpagesize());
ret_open: close(fd); ret_mknod: unlink(devname); }
static void do_both(unsigned int maj, unsigned int min) { do_one(S_IFCHR, maj, min); do_one(S_IFBLK, maj, min); }
static int blacklisted(unsigned int maj, unsigned int min) { /* Watchdog; will kill the system anyway */ if (maj == 10) { if (min == 130) return 1; if (min >= 212 && min <= 215) return 1; }
return 0; }
int main(int argc, char *argv[]) { #ifdef CONFIG_LOGGING logfile = fopen("mknod-logfile.txt", "w"); if (!logfile) exit(EXIT_FAILURE); #endif
unlink(devname);
// XXX #ifndef CONFIG_RANDOMIZE srand(time(NULL)); srand(getpid() * rand());
while (1) { unsigned int i = rand() % 256; unsigned int j = rand() % 256;
if (blacklisted(i, j)) continue;
do_both(i, j); } #else for (unsigned int i = 0; i < 128; ++i) { printf("maj: %d\n", i);
for (unsigned int j = 0; j < 128; ++j) { if (blacklisted(i, j)) continue;
do_both(i, j); } } doit(S_IFCHR, 10, 130); #endif
#ifdef CONFIG_LOGGING fclose(logfile); #endif return EXIT_SUCCESS; }
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