`vtr_reg_nightly_test7/titan_other_run_flat` Failed

[ueqri]

vtr_reg_nightly_test7/titan_other_run_flat/stratixiv_arch.timing.xml/CH_DFSIN_stratixiv_arch_timing.blif failed as mentioned in PR #2785.

This failure occurs after merging the serial router enhancement (#2720). Looks like the changes have led to a new corner case related to the sync_clustered_netlist_to_routing routine based on the following gdb backtraces.

@duck2 Hi, Fahri. I was wondering if you have any thoughts on this failure?

...... (logs are omitted; if needed, please refer to https://pastebin.ubuntu.com/p/Pz7VXPrcsz/)

Router Stats: total_nets_routed: 131085 total_connections_routed: 422775 total_heap_pushes: 101646662 total_heap_pops: 12876828
Serial Connection Router is being destroyed. Time spent on path search: 20.675 seconds.
# Routing took 126.47 seconds (max_rss 6977.0 MiB, delta_rss +3739.7 MiB)

Checking to ensure routing is legal...
# Checking to ensure non-configurable edges are legal
# Checking to ensure non-configurable edges are legal took 0.59 seconds (max_rss 6977.0 MiB, delta_rss +0.0 MiB)
Completed routing consistency check successfully.

Serial number (magic cookie) for the routing is: -670169817
Circuit successfully routed with a channel width factor of 300.
# Synchronize the packed netlist to routing optimization
/path/to/vpr/src/base/netlist.tpp:1947 associate_pin_with_net: Assertion 'net_pins_[net_id][0] == PinId::INVALID()' failed (Must be no existing net driver).

Program received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
51      ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007ffff7a227f1 in __GI_abort () at abort.c:79
#2  0x00005555556dfe89 in vtr::assert::handle_assert(char const*, char const*, unsigned int, char const*, char const*)
    (expr=0x555555a45670 "net_pins_[net_id][0] == PinId::INVALID()", file=<optimized out>, line=<optimized out>, function=0x555555a46209 "associate_pin_with_net", msg=0x555555a456c8 "Must be no existing net driver")
    at /home/yanhang1/updated-master/libs/libvtrutil/src/vtr_assert.cpp:21
#3  0x0000555555a2c876 in Netlist<ClusterBlockId, ClusterPortId, ClusterPinId, ClusterNetId>::associate_pin_with_net(ClusterPinId, PinType, ClusterNetId) (this=0x555555d46278 <g_vpr_ctx+3384>, pin_id=..., type=<optimized out>, net_id=...)
    at /path/to/vpr/src/base/netlist.tpp:1947
#4  0x0000555555a3887d in Netlist<ClusterBlockId, ClusterPortId, ClusterPinId, ClusterNetId>::create_pin(ClusterPortId, unsigned int, ClusterNetId, PinType, bool)
    (this=0x555555d46278 <g_vpr_ctx+3384>, port_id=..., port_bit=<optimized out>, net_id=..., type=<optimized out>, is_const=<optimized out>) at /path/to/vpr/src/base/netlist.tpp:754
#5  0x0000555555966f4f in ClusteredNetlist::create_pin(ClusterPortId, unsigned int, ClusterNetId, PinType, int, bool)
    (this=<optimized out>, is_const=false, pin_index=<optimized out>, pin_type_=<optimized out>, net_id=..., port_bit=<optimized out>, port_id=...) at /path/to/vpr/src/base/clustered_netlist.cpp:144
#6  sync_clustered_netlist_to_routing() ()
    at /path/to/vpr/src/pack/sync_netlists_to_routing_flat.cpp:407
#7  0x00005555559f9fd5 in sync_netlists_to_routing_flat() ()
    at /path/to/vpr/src/pack/sync_netlists_to_routing_flat.cpp:466
#8  vpr_analysis_flow(Netlist<vtr::StrongId<general_blk_id_tag, int, -1>, vtr::StrongId<general_port_id_tag, int, -1>, vtr::StrongId<general_pin_id_tag, int, -1>, vtr::StrongId<general_net_id_tag, int, -1> > const&, t_vpr_setup&, t_arch const&, RouteStatus const&, bool)
    (is_flat=true, route_status=..., Arch=<optimized out>, vpr_setup=<optimized out>, net_list=...)
    at /path/to/vpr/src/base/vpr_api.cpp:1482
#9  vpr_flow(t_vpr_setup&, t_arch&) (vpr_setup=<optimized out>, arch=<optimized out>)
    at /path/to/vpr/src/base/vpr_api.cpp:432
#10 0x00005555555f3e54 in main(int, char const**) (argc=15, argv=0x7fffffffdba8)

[duck2]

interesting... need to check