On Mon, 2013-03-18 at 18:59 -0700, Greg Kroah-Hartman wrote: > > If you'd like, I can send you 6 or so short user test programs that > > hang, crash, or deadlock inside 60 seconds on mainline and next, but not > > with this patchset. > > That would be interesting to have, please send them. > > And I hope that they only lock up when run as root, but I'm afraid to > ask that question... Sorry Greg, I meant to get to this sooner. This one is pretty straightforward. Does not require suid. I would still recommend only running this in a disposable vm -- that's what I do. The vm should have 6 cores to do real business. It helps to hook up netconsole or whatever so you can see what kind of progress it's making but don't use a slow framebuffer console because that invariably locks up :). If it pauses for 5 secs., that's actually correct behavior. --- >% --- Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> --- pts_test3.c | 151 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 151 insertions(+) create mode 100644 pts_test3.c diff --git a/pts_test3.c b/pts_test3.c new file mode 100644 index 0000000..b673f17 --- /dev/null +++ b/pts_test3.c @@ -0,0 +1,151 @@ +/* + * pts_test3.c + * + * Created on: Dec, 2012 + * Copyright (C) 2012 Ilya Zykov + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * Modified-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> + */ + +#include <stdio.h> +#include <fcntl.h> +#include <sys/ioctl.h> +#include <termios.h> +#include <stdlib.h> +#include <pthread.h> +#include <signal.h> + +#define BUF_SIZE 2 +#define ERROR_EXIT_CODE 1 +#define parent child_id + +static int +mfd=-1, sfd=-1, parent=1; + +static pthread_t +pth_id; + +static char +pty_name[24], buf[]={ '1', '\n' }; + + +static void +pty_exit(int ret, char * exit_message){ + if (sfd >= 0) close(sfd); + if (mfd >= 0) close(mfd); + printf("%s %s %s exit. \n",exit_message?exit_message:"", + ret?"Error":"Normal", parent?"parent":"child"); + exit(ret); +} + +static void +pty_init(void){ + int ptn; + if( (mfd=open("/dev/ptmx", O_RDWR )) < 0 ) + pty_exit(ERROR_EXIT_CODE,"Couldn't open /dev/ptmx. \n"); + if (ioctl(mfd, TIOCGPTN, &ptn) < 0 ) + pty_exit(ERROR_EXIT_CODE,"Couldn't get pty number. \n"); + snprintf(pty_name, sizeof(pty_name), "/dev/pts/%d", ptn); + //printf("Slave pty name = %s.\n",pty_name); + ptn=0; + if (ioctl(mfd, TIOCSPTLCK, &ptn) < 0 ) + pty_exit(ERROR_EXIT_CODE,"Couldn't unlock pty slave. \n"); + if ( (sfd=open(pty_name, O_RDWR )) < 0 ) + pty_exit(ERROR_EXIT_CODE, "Couldn't open pty slave. \n"); +} + +static void * +pty_thread_open(void * arg) { + static const char ret[]="Thread open has been created.\n"; + printf(ret); + do { + close(open(pty_name, O_RDWR )); + } while(1); + return ret; +} + +static void * +pty_thread_read(void * arg) { + static const char ret[]="Thread read has been created.\n"; + printf(ret); + do { + read(sfd, buf, BUF_SIZE); + } while(1); + return ret; +} + +static void * +pty_thread_write(void * arg) { + static char ret[]="Thread write has been created.\n"; + printf(ret); + do { + write(mfd, buf, BUF_SIZE); + } while(1); + return ret; +} + +#define N_PPS 18 + +static void * +pty_thread_msetd(void * arg) { + static const char ret[]="Thread msetd has been created.\n"; + static int ldisc; + printf(ret); + do { + ldisc = N_PPS; + ioctl(mfd, TIOCSETD, &ldisc); + ldisc = N_TTY; + ioctl(mfd, TIOCSETD, &ldisc); + } while(1); + return ret; +} + +static void * +pty_thread_ssetd(void * arg) { + static char ret[]="Thread ssetd has been created.\n"; + static int ldisc; + printf(ret); + do { + ldisc = N_PPS; + ioctl(sfd, TIOCSETD, &ldisc); + ldisc = N_TTY; + ioctl(sfd, TIOCSETD, &ldisc); + } while(1); + return ret; +} + +int main(int argc,char *argv[]) { + pty_init(); + child_id=fork(); + if(parent) { + sleep(100); + kill(child_id, SIGINT); + pty_exit(0,"Parent normal exit\n"); + } + pthread_create(&pth_id, NULL, &pty_thread_open, 0); + /* For WARNINGS. */ + pthread_create(&pth_id, NULL, &pty_thread_write, 0); + pthread_create(&pth_id, NULL, &pty_thread_read, 0); + + pthread_create(&pth_id, NULL, &pty_thread_msetd, 0); + pthread_create(&pth_id, NULL, &pty_thread_ssetd, 0); + do { + close(sfd); + close(mfd); + pty_init(); + } while(1); + return 0; +} -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
