Got Error : No symbol "mutex" in current context

[PRDinesh]

When I tried using this script I got the following error

---

Displaying blocking threads using 'blocked' command Python Exception <class 'gdb.error'> No symbol "mutex" in current context.: Error occurred in Python command: No symbol "mutex" in current context.

Is this because of my pthread library? do we have any solution for the same?

[DamZiobro]

Hard to say. Could you paste output of thread apply all bt command here? Also don't you see any errors if you invoke those python commands?

python 
import gdbDisplayLockedThreads
end 

[kevinbin]

(gdb) thread apply all bt

Thread 3 (Thread 0x7fc513d65700 (LWP 32036)): #0 0x00007fc51414254d in __lll_lock_wait () from /lib64/libpthread.so.0 #1 0x00007fc51413de9b in _L_lock_883 () from /lib64/libpthread.so.0 #2 0x00007fc51413dd68 in pthread_mutex_lock () from /lib64/libpthread.so.0 #3 0x0000000000400927 in writeTest (temp=0x0) at deadlockExample.c:15 #4 0x00007fc51413bea5 in start_thread () from /lib64/libpthread.so.0 #5 0x00007fc513e649fd in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fc513564700 (LWP 32037)): #0 0x00007fc51414254d in __lll_lock_wait () from /lib64/libpthread.so.0 #1 0x00007fc51413de9b in _L_lock_883 () from /lib64/libpthread.so.0 #2 0x00007fc51413dd68 in pthread_mutex_lock () from /lib64/libpthread.so.0 #3 0x00000000004009d5 in readTest (temp=0x0) at deadlockExample.c:35 #4 0x00007fc51413bea5 in start_thread () from /lib64/libpthread.so.0 #5 0x00007fc513e649fd in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fc514563740 (LWP 32035)): #0 0x00007fc51413d017 in pthread_join () from /lib64/libpthread.so.0 #1 0x0000000000400abc in main () at deadlockExample.c:60

(gdb) f 3 #3 0x00000000004009d5 in readTest (temp=0x0) at deadlockExample.c:35 35 pthread_mutex_lock(&write_mutex);

(gdb) t 3 [Switching to thread 3 (Thread 0x7fc513d65700 (LWP 32036))] #0 0x00007fc51414254d in __lll_lock_wait () from /lib64/libpthread.so.0 (gdb) f 3 #3 0x0000000000400927 in writeTest (temp=0x0) at deadlockExample.c:15 15 pthread_mutex_lock(&read_mutex);

(gdb) print mutex No symbol "mutex" in current context.

(gdb) print read_mutex $10 = {__data = {__lock = 2, __count = 0, __owner = 32037, __nusers = 1, __kind = 0, __spins = 0, __elision = 0, __list = {__prev = 0x0, __next = 0x0}}, __size = "\002\000\000\000\000\000\000\000%}\000\000\001", '\000' <repeats 26 times>, __align = 2}

gdb.execute("print mutex.__data.__owner", to_string=True).split()[2])

Is there any way to match the two mutex?