System hangs referring unfreed fasync_struct

Solution Verified - Updated -

Issue

  • System hung with waiting for lock in sigio function in mpt.

void send_sigio(struct fown_struct *fown, int fd, int band)
{
         struct task_struct *p;
         int pid;
        
         read_lock(&fown->lock); <<<
         pid = fown->pid;
         if (!pid)
                 goto out_unlock_fown;
        
         read_lock(&tasklist_lock);
         if (pid > 0) {
                 p = find_task_by_pid(pid);
                 if (p) {
                         send_sigio_to_task(p, fown, fd, band);
                 }
         } else {
                 do_each_task_pid(-pid, PIDTYPE_PGID, p) {
                         send_sigio_to_task(p, fown, fd, band);
                 } while_each_task_pid(-pid, PIDTYPE_PGID, p);
         }
         read_unlock(&tasklist_lock);
  out_unlock_fown:
         read_unlock(&fown->lock);
}

Environment

  • Red Hat Enterprise Linux 5 Update 4
  • Architecture:  x86_64
  • Kernel Version: kernel-2.6.18-164.el5
  • mptctl driver

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