Hi Stanislav,
Just to make sure the gdb macro is okay, could you run from gdb: pifi(pool,
index)? The function is defined in gdb_funcs.c.
Regards,
Florin
> On Oct 13, 2021, at 11:30 AM, Stanislav Zaikin <zsta...@gmail.com> wrote:
>
> Hello folks,
>
> I'm facing a strange issue with 2 worker threads. Sometimes I get a crash
> either in "ip6-lookup" or "mpls-lookup" nodes. They happen with assert in the
> pool_elt_at_index macro and always inside the "load_balance_get" function.
> But the load_balance dpo looks perfectly good, I mean it still has a lock and
> on regular deletion (in the case when the load_balance dpo is deleted) it
> should be erased properly (with dpo_reset). It happens usually when the main
> core is executing vlib_worker_thread_barrier_sync_int(), and the other worker
> is executing vlib_worker_thread_barrier_check().
> And the strangest thing is, when I run the vpp's gdb helper for checking
> "pool_index_is_free" or pifi, it shows me that the index isn't free (and the
> macro in that case shouldn't fire).
>
> Any thoughts and inputs are appreciated.
>
> Thread 3 "vpp_wk_0" received signal SIGABRT, Aborted.
> [Switching to Thread 0x7fb4f2e22700 (LWP 3244)]
> __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 0x00007fb5933fa921 in __GI_abort () at abort.c:79
> #2 0x00007fb594392799 in os_panic () at
> /home/vpp/vpp/src/vppinfra/unix-misc.c:177
> #3 0x00007fb5942d8f49 in debugger () at /home/vpp/vpp/src/vppinfra/error.c:84
> #4 0x00007fb5942d8cc7 in _clib_error (how_to_die=2, function_name=0x0,
> line_number=0, fmt=0x7fb5962ec8d0 "%s:%d (%s) assertion `%s' fails") at
> /home/vpp/vpp/src/vppinfra/error.c:143
> #5 0x00007fb5954bd694 in load_balance_get (lbi=3604) at
> /home/vpp/vpp/src/vnet/dpo/load_balance.h:222
> #6 0x00007fb5954bc070 in ip6_lookup_inline (vm=0x7fb51ceccd00,
> node=0x7fb520f6b700, frame=0x7fb52128e4c0) at
> /home/vpp/vpp/src/vnet/ip/ip6_forward.h:117
> #7 0x00007fb5954bbdd5 in ip6_lookup_node_fn_hsw (vm=0x7fb51ceccd00,
> node=0x7fb520f6b700, frame=0x7fb52128e4c0) at
> /home/vpp/vpp/src/vnet/ip/ip6_forward.c:736
> #8 0x00007fb594ec0076 in dispatch_node (vm=0x7fb51ceccd00,
> node=0x7fb520f6b700, type=VLIB_NODE_TYPE_INTERNAL,
> dispatch_state=VLIB_NODE_STATE_POLLING, frame=0x7fb52128e4c0,
> last_time_stamp=1808528151240447) at /home/vpp/vpp/src/vlib/main.c:1217
> #9 0x00007fb594ec09e7 in dispatch_pending_node (vm=0x7fb51ceccd00,
> pending_frame_index=5, last_time_stamp=1808528151240447) at
> /home/vpp/vpp/src/vlib/main.c:1376
> #10 0x00007fb594eba441 in vlib_main_or_worker_loop (vm=0x7fb51ceccd00,
> is_main=0) at /home/vpp/vpp/src/vlib/main.c:1904
> #11 0x00007fb594eb92e7 in vlib_worker_loop (vm=0x7fb51ceccd00) at
> /home/vpp/vpp/src/vlib/main.c:2038
> #12 0x00007fb594f1195d in vlib_worker_thread_fn (arg=0x7fb513a48100) at
> /home/vpp/vpp/src/vlib/threads.c:1868
> #13 0x00007fb5942fd214 in clib_calljmp () at
> /home/vpp/vpp/src/vppinfra/longjmp.S:123
> #14 0x00007fb4f2e21c90 in ?? ()
> #15 0x00007fb594f09b83 in vlib_worker_thread_bootstrap_fn
> (arg=0x7fb513a48100) at /home/vpp/vpp/src/vlib/threads.c:585
> #16 0x00007fb50c218355 in eal_thread_loop (arg=0x0) at
> ../src-dpdk/lib/librte_eal/linux/eal_thread.c:127
> #17 0x00007fb5947dc6db in start_thread (arg=0x7fb4f2e22700) at
> pthread_create.c:463
> #18 0x00007fb5934db71f in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
> (gdb) select 5
> (gdb) print _e
> $1 = (load_balance_t *) 0x7fb52651e580
> (gdb) print load_balance_pool[3604]
> $2 = {cacheline0 = 0x7fb52651e580 "\001", lb_n_buckets = 1,
> lb_n_buckets_minus_1 = 0, lb_proto = DPO_PROTO_IP6, lb_flags =
> LOAD_BALANCE_FLAG_NONE, lb_fib_entry_flags = (FIB_ENTRY_FLAG_CONNECTED |
> FIB_ENTRY_FLAG_LOCAL), lb_locks = 1, lb_map = 4294967295, lb_urpf = 4094,
> lb_hash_config = 31, lb_buckets = 0x0,
> lb_buckets_inline = {{{{dpoi_type = DPO_RECEIVE, dpoi_proto =
> DPO_PROTO_IP6, dpoi_next_node = 2, dpoi_index = 2094}, as_u64 =
> 8993661649164}}, {{{dpoi_type = DPO_FIRST, dpoi_proto = DPO_PROTO_IP4,
> dpoi_next_node = 0, dpoi_index = 0}, as_u64 = 0}}, {{{dpoi_type = DPO_FIRST,
> dpoi_proto = DPO_PROTO_IP4,
> dpoi_next_node = 0, dpoi_index = 0}, as_u64 = 0}}, {{{dpoi_type =
> DPO_FIRST, dpoi_proto = DPO_PROTO_IP4, dpoi_next_node = 0, dpoi_index = 0},
> as_u64 = 0}}}}
> (gdb) print &load_balance_pool[3604]
> $3 = (load_balance_t *) 0x7fb52651e580
> (gdb) source ~/vpp/extras/gdb/gdbinit
> Loading vpp functions...
> Load vlLoad pe
> Load pifi
> Load node_name_from_index
> Load vnet_buffer_opaque
> Load vnet_buffer_opaque2
> Load bitmap_get
> Done loading vpp functions...
> (gdb) pifi load_balance_pool 3604
> pool_is_free_index (load_balance_pool, 3604)$4 = 0
> (gdb) info threads
> Id Target Id Frame
> 1 Thread 0x7fb596bd2c40 (LWP 727) "vpp_main" 0x00007fb594f1439b in
> clib_time_now_internal (c=0x7fb59517ccc0 <vlib_global_main>,
> n=1808528155236639) at /home/vpp/vpp/src/vppinfra/time.h:215
> 2 Thread 0x7fb4f3623700 (LWP 2976) "eal-intr-thread" 0x00007fb5934dba47
> in epoll_wait (epfd=17, events=0x7fb4f3622d80, maxevents=1, timeout=-1) at
> ../sysdeps/unix/sysv/linux/epoll_wait.c:30
> * 3 Thread 0x7fb4f2e22700 (LWP 3244) "vpp_wk_0" __GI_raise
> (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
> 4 Thread 0x7fb4f2621700 (LWP 3246) "vpp_wk_1" 0x00007fb594ebf897 in
> vlib_worker_thread_barrier_check () at /home/vpp/vpp/src/vlib/threads.h:439
>
> --
> Best regards
> Stanislav Zaikin
>
>
>
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