Hi, > It triggers a bug in SimpleMessenger that causes threads for broken connections to spin, eating CPU. #0 0x00007ff431d0c8cf in __libc_recv (fd=190, buf=0x7ff3b3c23000, n=4096, flags=64) at ../sysdeps/unix/sysv/linux/x86_64/recv.c:28 #1 0x0000559d723e46f6 in Pipe::do_recv(char*, unsigned long, int) () #2 0x0000559d723e4a57 in Pipe::buffered_recv(char*, unsigned long, int) () #3 0x0000559d723e4b53 in Pipe::tcp_read_nonblocking(char*, unsigned int) () #4 0x0000559d723e4e0d in Pipe::tcp_read(char*, unsigned int) () #5 0x0000559d723f2577 in Pipe::reader() () #6 0x0000559d723fc51d in Pipe::Reader::entry() () #7 0x00007ff431d0370a in start_thread (arg=0x7ff3c3afc700) at pthread_create.c:333 #8 0x00007ff42fd7c82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 https://github.com/ceph/ceph/blob/jewel/src/msg/simple/Pipe.cc#L2522-L2525 Under Linux, select/poll/epoll may report a socket file descriptor as "ready for reading", while nevertheless a subsequent read blocks, or returns an error (EAGAIN) in non-blocking mode. Pipe::do_recv() should stop on EAGAIN (at least when using nonblocking IO) instead of retrying. Best regards, Alexey -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
