https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209130
Bug ID: 209130
Summary: The Dtrace PID provider not working with 32 bit
daemons in a 64 bit environment.
Product: Base System
Version: 10.2-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: misc
Assignee: freebsd-b...@freebsd.org
Reporter: abhya...@gmail.com
CC: freebsd-amd64@FreeBSD.org
CC: freebsd-amd64@FreeBSD.org
Tested for a sample daemon on Stock FreeBSD 10.2 Release with 32 bit and 64
bit executables. The daemon had an orphan child process running a while loop
with sleep(). Pasted below is the code for the sample daemon :
int main()
{
pid_t process_id = 0;
// Create child process
process_id = fork();
if (process_id < 0)
{
printf("fork failed!\n");
exit(1);
}
// killing the parent
if (process_id > 0)
{
printf("The process id of the child is :%d" , process_id);
exit(0);
}
while (1)
{
sleep(1);
}
}
* The child process’s pid was then traced for using dtrace –n
‘pid$target:::entry {} ‘ -p < pid of the child process >
* The dtrace test on the 32 bit daemon reported a segmentation fault : signal
11 and resulted into a core. The backtrace of the core looked like :
Core was generated by `daemon'.
Program terminated with signal 11, Segmentation fault.
#0 0x00000000 in ?? ()
(gdb) bt
#0 0x00000000 in ?? ()
#1 0x08054802 in .cerror () at
../../../../../src/bsd/lib/libc/i386/sys/cerror.S:62
#2 0x0804991f in __sleep (seconds=1) at
../../../../../src/bsd/lib/libc/gen/sleep.c:63
#3 0x08048232 in main () at
../../../../../src/junos/usr.sbin/dump_proc/daemon.c:27
* The dtrace test on the 64 bit daemon did not report any errors and was traced
correctly.
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