Messages in this thread | | | Subject | Unkillable gdb process gets system unusably slow | From | Timo Sirainen <> | Date | Fri, 23 Nov 2007 06:54:55 +0200 |
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Fully reproducible with me. v2.6.23.1 x86-64 SMP kernel, Core 2 CPU, gdb v6.6.90.20070912-debian.
gdb ./hang run fr 1 p (char*)base
p command hangs and the entire system becomes unusably slow. kill -9 doesn't kill gdb.
/* gcc hang.c -o hang -g -Wall */ #include <stdio.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #include <sys/mman.h>
int main(void) { int fd; char buf[100]; void *base;
fd = open("hang.tmp", O_RDWR | O_CREAT, 0600); if (fd == -1) perror("open");
base = mmap(NULL, 100, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); if (base == MAP_FAILED) perror("mmap"); memcpy(buf, base, sizeof(buf)); return 0; }
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