I looked into the source code, and found some reconnect method from libiscsi. Are they able to work?
QEMU: 2.12.1 libiscsi: 1.18.0 (https://github.com/sahlberg/libiscsi) (gdb) f #0 0x00007fcd956933bd in iscsi_reconnect (iscsi=0x7fcd97f206d0) at connect.c:461 461 memcpy(tmp_iscsi->old_iscsi, iscsi, sizeof(struct iscsi_context)); (gdb) bt #0 0x00007fcd956933bd in iscsi_reconnect (iscsi=0x7fcd97f206d0) at connect.c:461 #1 0x00007fcd956a4ccd in iscsi_service_reconnect_if_loggedin (iscsi=0x7fcd97f206d0) at socket.c:879 #2 0x00007fcd956a50d2 in iscsi_tcp_service (iscsi=0x7fcd97f206d0, revents=<value optimized out>) at socket.c:989 #3 0x00007fcd9674b737 in iscsi_process_read (arg=0x7fcd97f1e680) at block/iscsi.c:371 #4 0x00007fcd967e5b47 in aio_dispatch_handlers (ctx=0x7fcd97ee48d0) at util/aio-posix.c:406 #5 0x00007fcd967e5ce9 in aio_dispatch (ctx=0x7fcd97ee48d0) at util/aio-posix.c:437 #6 0x00007fcd967e038c in aio_ctx_dispatch (source=0x7fcd97ee48d0, callback=0, user_data=0x0) at util/async.c:261 #7 0x00007fcd93b1135e in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0 #8 0x00007fcd967e424e in glib_pollfds_poll () at util/main-loop.c:215 #9 0x00007fcd967e4368 in os_host_main_loop_wait (timeout=987000000) at util/main-loop.c:263 #10 0x00007fcd967e4438 in main_loop_wait (nonblocking=0) at util/main-loop.c:522 #11 0x00007fcd963c4b29 in main_loop () at vl.c:1943 #12 0x00007fcd963cca8d in main (argc=62, argv=0x7ffff89f4208, envp=0x7ffff89f4400) at vl.c:4734
