Bug#360700: arm: hangs on wait4

[Baurzhan Ismagulov]

Package: strace
Version: 4.5.12-1
Severity: normal


Hello Roland,

strace hangs on wait4:

[EMAIL PROTECTED]:~$ strace -f ./a.out
...
fork(Process 749 attached
)                                  = 749
[pid   748] fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
[pid   748] old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40016000
[pid   748] write(1, "parent\n", 7parent
)     = 7
[pid   748] wait4(749, Process 748 suspended
child
<hangs>

[EMAIL PROTECTED]:~$ ps ax |grep a.out |grep -v grep
  750 pts/0    S+     0:00 strace -f ./a.out
  751 pts/0    T+     0:00 ./a.out
  752 pts/0    Z+     0:00 [a.out] <defunct>

The same works on i386. I don't know whether this is a kernel or strace
problem. How should I proceed?

Thanks in advance,
Baurzhan.

-- System Information:
Debian Release: 3.1
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: arm (armv5tel)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.4.19-rmk7-pxa1-rtc-m24-nfs
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)

Versions of packages strace depends on:
ii  libc6                         2.3.5-6    GNU C Library: Shared libraries an

-- no debconf information

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

int
main(void)
{
	int status;
	pid_t pid = fork();

	switch (pid) {
	case -1:
		perror("fork");
		return 2;
	case 0:
		sleep(1);
		printf("child\n");
		break;
	default:
		printf("parent\n");
		wait4(pid, &status, 0, NULL);
		break;
	}

	return 0;
}