open("/dev/tty", O_RDWR|O_NOCTTY|O_NONBLOCK) = 7 writev(7, [{"*** glibc detected ***

Hi ,

I am using a Linux platform (3.12.13 & 2.6.35.3),& imx5x series processor.
In my program I am using the two serial port for read write operation /dev/ttymxc2 & /dev/ttymxc1 .After some duration the /dev/tty open system call executes which is not a part of my program & the error comes open("/dev/tty", ...) writev(7, [{"*** glibc detected *** ", 23}.

Please suggest some solution ,the port which i am not using in my code still system call executed to open /dev/tty/ .

These are some strace log .


open("/dev/ttymxc2", O_RDWR|O_NOCTTY|O_NONBLOCK) = 4
nanosleep({0, 200000000}, NULL) = 0
ioctl(4, TCFLSH, 0x2) = 0
ioctl(4, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B9600 opost -isig -icanon -echo ...}) = 0
ioctl(4, SNDCTL_TMR_START or SNDRV_TIMER_IOCTL_TREAD or TCSETS, {B9600 opost -isig -icanon -echo ...}) = 0
open("/dev/ttymxc0", O_RDWR|O_NONBLOCK) = 5
ioctl(5, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B115200 opost -isig -icanon -echo ...}) = 0
ioctl(5, SNDCTL_TMR_START or SNDRV_TIMER_IOCTL_TREAD or TCSETS, {B115200 opost -isig -icanon -echo ...}) = 0
open("/dev/ttymxc1", O_RDWR|O_NOCTTY|O_NONBLOCK) = 6
nanosleep({0, 200000000}, NULL) = 0
ioctl(6, TCFLSH, 0x2) = 0
ioctl(6, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B9600 opost -isig -icanon -echo ...}) = 0
ioctl(6, SNDCTL_TMR_START or SNDRV_TIMER_IOCTL_TREAD or TCSETS, {B9600 opost -isig -icanon -echo ...}) = 0
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x76f2d000
write(1, "in main \n", 9) = 9
write(1, " Leaving process fun \n", 22) = 22
sigreturn() (mask []) = 71
write(1, "bab0 bab0\n", 11) = 11
open("/dev/tty", O_RDWR|O_NOCTTY|O_NONBLOCK) = 7
writev(7, [{"*** glibc detected *** ", 23}, {"./test11_2", 10}, {": ", 2}, {"double free or corruption (!prev"..., 33}, {": 0x", 4}, {"00bfa0c0", 8}, {" ***\n", 5}], 7) = 85
mmap2(NULL, 2097152, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) = 0x76d2d000
munmap(0x76d2d000, 864256) = 0
munmap(0x76f00000, 184320) = 0
mprotect(0x76e00000, 135168, PROT_READ|PROT_WRITE) = 0
rt_sigprocmask(SIG_UNBLOCK, [ABRT], NULL, 8) = 0
write(1, "final out", 9) = 9
gettid() = 8796
tgkill(8796, 8796, SIGABRT) = 0
--- SIGABRT {si_signo=SIGABRT, si_code=SI_TKILL, si_pid=8796, si_uid=0} ---
+++ killed by SIGABRT +++

open("/dev/tty", O_RDWR|O_NOCTTY|O_NONBLOCK) = 7
writev(7, [{"*** glibc detected *** ", 23}, {"./test11_2", 10}, {": ", 2}, {"double free or corruption (!prev"..., 33}, {": 0x", 4}, {"00bfa0c0", 8}, {" ***\n", 5}], 7) = 85

/dev/tty is opened for the purpose of printing the error message, your program doesn't open tty but it does cause the error.

Double free or corruption sounds like pointer troubles to me, did you close a file handle or free some memory at that point?

Hi ,
I solve the double free error .

But after sometime I am getting the following error & program gets hang.
I am using signal alarm & settings are given below.

struct itimerval delay;

// int i=0;
signal(SIGALRM,alarm_handler);

delay.it_value.tv_sec = 0;
delay.it_value.tv_usec = 400000;
delay.it_interval.tv_sec = 0;
delay.it_interval.tv_usec = 400000;

ret = setitimer(ITIMER_REAL, &delay, NULL);
if(ret)
{
perror("setitimer");
//return -1;
}


the program will hang up for infinite time & futex error comes.

Can you please help for how to set the restart time when this error comes.

These are some strace logs:

close(7) = 0
write(1, "\n", 1) = 1
open("/sys/class/gpio/export", O_WRONLY) = 7
write(7, "111", 3) = 3
close(7) = 0
open("/sys/class/gpio/gpio111/value", O_WRONLY) = 7
write(7, "1", 1) = 1
close(7) = 0
open("/sys/class/gpio/unexport", O_WRONLY) = 7
write(7, "111", 3) = 3
close(7) = 0
open("/sys/class/gpio/export", O_WRONLY) = 7
write(7, "4", 1) = 1
close(7) = 0
open("/sys/class/gpio/gpio4/value", O_WRONLY) = 7
write(7, "0", 1) = 1
close(7) = 0
open("/sys/class/gpio/unexport", O_WRONLY) = 7
write(7, "4", 1) = 1
close(7) = 0
write(1, " MAIN START ********lat 1516.03"..., 64) = 64
write(1, "\n", 1) = 1
--- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---
write(1, " status value hex in main 40 \n", 30) = 30
gettimeofday({946685166, 936965}, NULL) = 0
futex(0xc20f0, FUTEX_WAIT, 2, NULL) = ? ERESTARTSYS (To be restarted if SA_RESTART is set)
--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
+++ killed by SIGINT +++