Yesterday it happened again, exactly the same pattern:
Reading symbols from ./build-tree/fam-2.7.0/src/famd...done.
[New LWP 18773]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/sbin/famd -v -f -T 0'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x0000000000000000 in ?? ()
(gdb) bt
#0 0x0000000000000000 in ?? ()
#1 0x00000000004128e7 in TCP_Client::unblock_handler (closure=0x10982a0) at
TCP_Client.c++:270
#2 0x00000000004103cc in Scheduler::handle_io (fds=0x1a4dd70,
fds@entry=0x7ffce30d7a40,
iotype=&Scheduler::FDInfo::read, iotype@entry=&Scheduler::FDInfo::write) at
Scheduler.c++:315
#3 0x0000000000410601 in Scheduler::select () at Scheduler.c++:342
#4 0x0000000000402dc5 in loop () at Scheduler.h:89
#5 main (argc=<optimized out>, argv=0x7ffce30d7cb8) at main.c++:306
This confirms the diagnosis. I put a couple of assertions like so:
--- src/TCP_Client.c++.orig 2003-01-18 15:18:12.000000000 +0100
+++ src/TCP_Client.c++ 2018-03-15 18:35:24.000000000 +0100
@@ -287,12 +287,14 @@
{
if (!to_be_scanned.size())
conn.ready_for_input(false);
+ assert((*(long **)ip)[4] != 0L); // ip func[4] (scan) not virtual
to_be_scanned.insert(ip);
}
void
TCP_Client::dequeue_from_scan(Interest *ip)
{
+ assert((*(long **)ip)[4] != 0L); // ip func[4] (scan) not virtual
to_be_scanned.remove(ip);
if (!to_be_scanned.size())
conn.ready_for_input(true);
While recompiling, I noticed this warning:
Listener.o: In function `Listener::create_local_client(TCP_Client&, unsigned
int)':
fam-2.7.0/build-tree/fam-2.7.0/src/Listener.c++:220: warning: the use of
`tempnam' is dangerous, better use `mkstemp'
I'm not sure how that is related to this bug, if at all.
Waiting for next core dump...
