Hello,
I'm trying to reincarnate router plugin. But I stuck with a pretty simple
thing, when I need to allocate a buffer to store a packet from a tap
device, everything is going well. But when the next node decides to free
this buffer I get a clib_error.
Basically, code is pretty simple and straightforward:
u32 bi = ~0;
vlib_buffer_t * b;
if( vlib_buffer_alloc (vm, &bi, 1) != 1 )
//err handling
b = vlib_get_buffer (vm, bi);
VLIB_BUFFER_TRACE_TRAJECTORY_INIT(b);
n_bytes = read (fd, b->data, vlib_buffer_get_default_data_size (vm));
// err handling
b->current_length = n_bytes;
vnet_buffer (b)->sw_if_index[VLIB_RX] = sw_if_index;
vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
vnet_hw_interface_t * hw;
vlib_frame_t * new_frame;
u32 * to_next;
hw = vnet_get_hw_interface (vnet_get_main (), sw_if_index);
new_frame = vlib_get_frame_to_node (vm, hw->output_node_index);
to_next = vlib_frame_vector_args (new_frame);
to_next[0] = bi;
new_frame->n_vectors = 1;
vlib_put_frame_to_node (vm, hw->output_node_index, new_frame);
Error looks like:
gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1 0x00007ffff6936859 in __GI_abort () at abort.c:79
#2 0x00007ffff6bd73bf in os_panic () at
/home/zstas/vpp/src/vppinfra/unix-misc.c:177
#3 0x00007ffff6b37ea4 in debugger () at /home/zstas/vpp/src/vppinfra/error.c:84
#4 0x00007ffff6b38295 in _clib_error (how_to_die=2,
function_name=0x7ffff6d39c40 <__FUNCTION__.16>
"vlib_buffer_validate_alloc_free", line_number=366, fmt=0x7ffff6d3974a
"%s %U buffer 0x%x")
at /home/zstas/vpp/src/vppinfra/error.c:143
#5 0x00007ffff6c644fc in vlib_buffer_validate_alloc_free
(vm=0x7ffff6d67bc0 <vlib_global_main>, buffers=0x7fffafc725f0,
n_buffers=1, expected_state=VLIB_BUFFER_KNOWN_ALLOCATED)
at /home/zstas/vpp/src/vlib/buffer.c:366
#6 0x00007ffff6c4a08c in vlib_buffer_pool_put (vm=0x7ffff6d67bc0
<vlib_global_main>, buffer_pool_index=0 '\000',
buffers=0x7fffafc725f0, n_buffers=1) at
/home/zstas/vpp/src/vlib/buffer_funcs.h:754
#7 0x00007ffff6c4a8c9 in vlib_buffer_free_inline (vm=0x7ffff6d67bc0
<vlib_global_main>, buffers=0x7fffb6b37ed4, n_buffers=0, maybe_next=1)
at /home/zstas/vpp/src/vlib/buffer_funcs.h:924
#8 0x00007ffff6c4a919 in vlib_buffer_free (vm=0x7ffff6d67bc0
<vlib_global_main>, buffers=0x7fffb6b37ed0, n_buffers=1) at
/home/zstas/vpp/src/vlib/buffer_funcs.h:943
#9 0x00007ffff6c4b3b5 in process_drop_punt (vm=0x7ffff6d67bc0
<vlib_global_main>, node=0x7fffb6b772c0, frame=0x7fffb6b37ec0,
disposition=ERROR_DISPOSITION_DROP) at
/home/zstas/vpp/src/vlib/drop.c:231
#10 0x00007ffff6c4b4bf in error_drop_node_fn_hsw (vm=0x7ffff6d67bc0
<vlib_global_main>, node=0x7fffb6b772c0, frame=0x7fffb6b37ec0) at
/home/zstas/vpp/src/vlib/drop.c:247
#11 0x00007ffff6cba2e2 in dispatch_node (vm=0x7ffff6d67bc0
<vlib_global_main>, node=0x7fffb6b772c0, type=VLIB_NODE_TYPE_INTERNAL,
dispatch_state=VLIB_NODE_STATE_POLLING, frame=0x7fffb6b37ec0,
last_time_stamp=77969722318942) at /home/zstas/vpp/src/vlib/main.c:1223
#12 0x00007ffff6cbaa19 in dispatch_pending_node (vm=0x7ffff6d67bc0
<vlib_global_main>, pending_frame_index=2,
last_time_stamp=77969722318942) at
/home/zstas/vpp/src/vlib/main.c:1384
#13 0x00007ffff6cbcdd3 in vlib_main_or_worker_loop (vm=0x7ffff6d67bc0
<vlib_global_main>, is_main=1) at /home/zstas/vpp/src/vlib/main.c:1912
#14 0x00007ffff6cbd848 in vlib_main_loop (vm=0x7ffff6d67bc0
<vlib_global_main>) at /home/zstas/vpp/src/vlib/main.c:2040
#15 0x00007ffff6cbe66b in vlib_main (vm=0x7ffff6d67bc0
<vlib_global_main>, input=0x7fffafc73fb0) at
/home/zstas/vpp/src/vlib/main.c:2286
#16 0x00007ffff6d29ac5 in thread0 (arg=140737334639552) at
/home/zstas/vpp/src/vlib/unix/main.c:670
#17 0x00007ffff6b56f10 in clib_calljmp () at
/home/zstas/vpp/src/vppinfra/longjmp.S:123
#18 0x00007fffffffd150 in ?? ()
#19 0x00007ffff6d2a095 in vlib_unix_main (argc=28,
argv=0x555555631e50) at /home/zstas/vpp/src/vlib/unix/main.c:747
#20 0x000055555555cd8b in main (argc=28, argv=0x555555631e50) at
/home/zstas/vpp/src/vpp/vnet/main.c:338
Buffer index seems right:
Thread 1 "vpp_main" hit Breakpoint 1, tap_rx (vm=0x7ffff6d67bc0
<vlib_global_main>, node=0x7fffb6a75d00, f=0x0, fd=23) at
router/tap_inject_node.c:187
warning: Source file is more recent than executable.
(gdb) info localsim = 0x7fffb002b7c0 <tap_inject_main>sw_if_index =
1bi = 653093b = 0x10027dc940n_bytes = 90__FUNCTION__ = "tap_rx"
/* later */
Thread 1 "vpp_main" received signal SIGABRT, Aborted.__GI_raise
(sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50 ../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:50
#1 0x00007ffff6936859 in __GI_abort () at abort.c:79
#2 0x00007ffff6bd73bf in os_panic () at
/home/zstas/vpp/src/vppinfra/unix-misc.c:177
#3 0x00007ffff6b37ea4 in debugger () at /home/zstas/vpp/src/vppinfra/error.c:84
#4 0x00007ffff6b38295 in _clib_error (how_to_die=2,
function_name=0x7ffff6d39c40 <__FUNCTION__.16>
"vlib_buffer_validate_alloc_free", line_number=366, fmt=0x7ffff6d3974a
"%s %U buffer 0x%x")
at /home/zstas/vpp/src/vppinfra/error.c:143
#5 0x00007ffff6c644fc in vlib_buffer_validate_alloc_free
(vm=0x7ffff6d67bc0 <vlib_global_main>, buffers=0x7fffafc725f0,
n_buffers=1, expected_state=VLIB_BUFFER_KNOWN_ALLOCATED)
at /home/zstas/vpp/src/vlib/buffer.c:366
#6 0x00007ffff6c4a08c in vlib_buffer_pool_put (vm=0x7ffff6d67bc0
<vlib_global_main>, buffer_pool_index=0 '\000',
buffers=0x7fffafc725f0, n_buffers=1) at
/home/zstas/vpp/src/vlib/buffer_funcs.h:754
/* omit */
(gdb) select 6
(gdb) print buffers[0]
$6 = 653093
Maybe I need to set some flags on the allocated buffer? Or what else
am I missing?
--
Best regards
Stanislav Zaikin
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