libp11 hangs/deadlocks in p11_slot.c:pkcs11_get_session()

[ThinLinc-Zeijlon]

I am using libp11 as an engine for osslsigncode (openssl under the surface i suspect). When performing a sign operation, libp11 hangs in p11_slot.c:pkcs11_get_session(). Note that I am running this in a bit of a non standard environment, and that when running directly on my regular system I do not have this problem.

When running this with gdb, I can see that the hang occurs at the call to pthread_cond_wait() in pkcs11_get_session(), and when putting a break point at pkcs11_get_session() the output of the slot, just before the hanging call, looks as below.

print *slot
$3 = {
  refcnt = 0,
  ctx = 0x0,
  lock = {
    __data = {
      __lock = 0,
      __count = 0,
      __owner = 0,
      __nusers = 0,
      __kind = 0,
      __spins = 0,
      __list = {
        __prev = 0x0,
        __next = 0x0
      }
    },
    __size = '\000' <repeats 39 times>,
    __align = 0
  },
  cond = {
    __data = {
      __lock = 0,
      __futex = 0,
      __total_seq = 0,
      __wakeup_seq = 0,
      __woken_seq = 0,
      __mutex = 0x0,
      __nwaiters = 0,
      __broadcast_seq = 0
    },
    __size = '\000' <repeats 47 times>,
    __align = 0
  },
  rw_mode = 32 ' ',
  logged_in = -2 '\376',
  id = 0,
  session_pool = 0x0,
  session_head = 0,
  session_tail = 0,
  session_poolsize = 0,
  num_sessions = 0,
  max_sessions = 0,
  forkid = 0,
  prev_pin = 0x41 <error: Cannot access memory at address 0x41>,
  secure_login = 0 '\000',
  prv = {
    num = 0,
    keys = 0x0
  },
  pub = {
    num = 0,
    keys = 0x0
  },
  ncerts = 0,
  certs = 0x0
}

I'm not sure if the original problem is caused by libp11, but at least it seems like it is calling pthread_cond_wait() at a point in time where it should not.