Hi An drew,

Myself modified the code to suit some requirement. The plain vpp acl module 
also crashes in similar situation.
I am expecting the vpp should crash while trying to add more sessions. The 
system has 64 GB RAM and vpp was using  3.44% of the memory while crashing. So 
the system is not out of memory but its not configured to use the available 
memory.

The relevant crash bt is this

#5  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#6  0x00007f2fba309859 in __GI_abort () at abort.c:79
#7  0x00007f2fba4e0bba in os_panic () at 
/root/code/vpp/src/vppinfra/unix-misc.c:221
#8  os_out_of_memory () at /root/code/vpp/src/vppinfra/unix-misc.c:221
#9  0x00007f2fba721701 in clib_mem_alloc_aligned_at_offset 
(os_out_of_memory_on_failure=1, align_offset=0, align=64, size=98368) at 
/root/code/vpp/src/vppinfra/mem.h:243
#10 clib_mem_alloc_aligned (align=64, size=98368) at 
/root/code/vpp/src/vppinfra/mem.h:263
#11 alloc_aligned_16_8 (nbytes=12288, h=0x7f2f79d59998 <acl_main+728>) at 
/root/code/vpp/src/vppinfra/bihash_template.c:77
#12 value_alloc_16_8 (h=0x7f2f79d59998 <acl_main+728>, log2_pages=<optimized 
out>) at /root/code/vpp/src/vppinfra/bihash_template.c:462
#13 0x00007f2fbabdaefd in split_and_rehash_16_8 (h=h@entry=0x7f2f79d59998 
<acl_main+728>, old_values=old_values@entry=0x7f2faf1d9a00,
old_log2_pages=old_log2_pages@entry=5, new_log2_pages=new_log2_pages@entry=7) 
at /root/code/vpp/src/vppinfra/bihash_template.c:581
#14 0x00007f2fbabdcbd0 in clib_bihash_add_del_inline_with_hash_16_8 (arg=0x0, 
is_stale_cb=0x0, is_add=1, hash=<optimized out>, add_v=0x7f19a6991b48,
h=0x7f2f79d59998 <acl_main+728>) at 
/root/code/vpp/src/vppinfra/bihash_template.c:901
#15 clib_bihash_add_del_inline_16_8 (arg=0x0, is_stale_cb=0x0, is_add=1, 
add_v=0x7f19a6991b48, h=0x7f2f79d59998 <acl_main+728>)
at /root/code/vpp/src/vppinfra/bihash_template.c:985
#16 clib_bihash_add_del_16_8 (h=h@entry=0x7f2f79d59998 <acl_main+728>, 
add_v=add_v@entry=0x7f19a6991b48, is_add=is_add@entry=1)
at /root/code/vpp/src/vppinfra/bihash_template.c:992
#17 0x00007f2f798bc8b5 in acl_fa_add_session (current_policy_epoch=<optimized 
out>, p5tuple=0x7f2f7cd5bc58, now=7927760728493450, sw_if_index=<optimized 
out>, is_ip6=0,
is_input=0, am=<optimized out>) at 
/root/code/vpp/src/plugins/acl/session_inlines.h:577
#18 acl_fa_inner_node_fn (reclassify_sessions=1, node_trace_on=0, 
with_stateful_datapath=1, is_l2_path=1, is_input=0, is_ip6=0, 
frame=0x7f2f8c5f6440,
node=0x7f2f8d6de980, vm=0x7f2f8d6f3dc0) at 
/root/code/vpp/src/plugins/acl/dataplane_node.c:1137
#19 acl_fa_outer_node_fn (do_stateful_datapath=1, is_l2_path=1, is_input=0, 
is_ip6=0, frame=0x7f2f8c5f6440, node=0x7f2f8d6de980, vm=0x7f2f8d6f3dc0)
at /root/code/vpp/src/plugins/acl/dataplane_node.c:1428
#20 acl_fa_node_fn (is_l2_path=1, is_input=0, is_ip6=0, frame=0x7f2f8c5f6440, 
node=0x7f2f8d6de980, vm=0x7f2f8d6f3dc0)
at /root/code/vpp/src/plugins/acl/dataplane_node.c:1456
#21 acl_out_l2_ip4_node_fn_hsw (vm=0x7f2f8d6f3dc0, node=0x7f2f8d6de980, 
frame=0x7f2f8c5f6440) at /root/code/vpp/src/plugins/acl/dataplane_node.c:1569
#22 0x00007f2fba595fa6 in dispatch_node (last_time_stamp=<optimized out>, 
frame=0x7f2f8c5f6440, dispatch_state=VLIB_NODE_STATE_POLLING, 
type=VLIB_NODE_TYPE_INTERNAL,
node=0x7f2f8d6de980, vm=0x7f2f8d6de980) at /root/code/vpp/src/vlib/main.c:1039
#23 dispatch_pending_node (vm=vm@entry=0x7f2f8d6f3dc0, 
pending_frame_index=pending_frame_index@entry=7, last_time_stamp=<optimized 
out>)
at /root/code/vpp/src/vlib/main.c:1198
#24 0x00007f2fba5978ff in vlib_main_or_worker_loop (is_main=0, 
vm=0x7f2f8d6f3dc0) at /root/code/vpp/src/vlib/main.c:1662
#25 vlib_worker_loop (vm=vm@entry=0x7f2f8d6f3dc0) at 
/root/code/vpp/src/vlib/main.c:1796
#26 0x00007f2fba5c4bf8 in vlib_worker_thread_fn (arg=<optimized out>) at 
/root/code/vpp/src/vlib/threads.c:1872
#27 0x00007f2fba529cb0 in clib_calljmp () from 
/lib/x86_64-linux-gnu/libvppinfra.so.21.06
#28 0x00007f2f72896d10 in ?? ()
#29 0x00007f2f76976c5d in eal_thread_loop.cold () from 
/usr/lib/x86_64-linux-gnu/vpp_plugins/dpdk_plugin.so
#30 0x0000000000000000 in ?? ()

In the frame 18 before calling acl_fa_can_add_session, why 
acl_fa_can_add_session is not failing ? What Is best way to set configuration 
so that vpp able to use more RAM ?

Thanks,
Mahamuda
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