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authorSteven <sluong@cisco.com>2018-01-29 20:09:09 -0800
committerSteven <sluong@cisco.com>2018-01-29 20:20:47 -0800
commita7effa1b072463f12305a474f082aeaffb7ada4b (patch)
tree6db4b05344fbdb42bf642ac1f045622739a7ef1b /src/vlib/buffer.c
parent92b15bcea4c6c5e62415a8207463eb9a897630c6 (diff)
vlib: allocating buffers on thread-x and freeing them on thread-y causes
a crash on debug image (VPP-1151) In debug image, there is extra code to validate the buffer when it is freed. It uses the hash table to lookup the buffer index with spinlock to prevent contention. However, there is one spinlock for each worker thread. So allocating the buffer on thread-x and freeing the same buffer on thread-y causes the validation to fail on thread-y. The fix is to have only one spinlock, stored in vlib_global_main. Change-Id: Ic383846cefe84a3e262255afcf82276742f0f62e Signed-off-by: Steven <sluong@cisco.com>
Diffstat (limited to 'src/vlib/buffer.c')
-rw-r--r--src/vlib/buffer.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/src/vlib/buffer.c b/src/vlib/buffer.c
index 880cd95a067..400488d0352 100644
--- a/src/vlib/buffer.c
+++ b/src/vlib/buffer.c
@@ -185,7 +185,7 @@ vlib_validate_buffer_helper (vlib_main_t * vm,
vlib_buffer_known_state_t k;
u8 *msg, *result;
- k = vlib_buffer_is_known (vm, b->next_buffer);
+ k = vlib_buffer_is_known (b->next_buffer);
if (k != VLIB_BUFFER_KNOWN_ALLOCATED)
return format (0, "next 0x%x: %U",
b->next_buffer, format_vlib_buffer_known_state, k);
@@ -243,7 +243,7 @@ vlib_validate_buffers (vlib_main_t * vm,
goto done;
}
- k = vlib_buffer_is_known (vm, bi);
+ k = vlib_buffer_is_known (bi);
if (k != known_state)
{
msg = format (0, "is %U; expected %U",
@@ -317,7 +317,7 @@ vlib_buffer_validate_alloc_free (vlib_main_t * vm,
bi = b[0];
b += 1;
- known = vlib_buffer_is_known (vm, bi);
+ known = vlib_buffer_is_known (bi);
if (known != expected_state)
{
ASSERT (0);
@@ -328,8 +328,7 @@ vlib_buffer_validate_alloc_free (vlib_main_t * vm,
}
vlib_buffer_set_known_state
- (vm, bi,
- is_free ? VLIB_BUFFER_KNOWN_FREE : VLIB_BUFFER_KNOWN_ALLOCATED);
+ (bi, is_free ? VLIB_BUFFER_KNOWN_FREE : VLIB_BUFFER_KNOWN_ALLOCATED);
}
}
@@ -580,7 +579,7 @@ vlib_buffer_fill_free_list_internal (vlib_main_t * vm,
bi[i] = vlib_get_buffer_index (vm, b);
if (CLIB_DEBUG > 0)
- vlib_buffer_set_known_state (vm, bi[i], VLIB_BUFFER_KNOWN_FREE);
+ vlib_buffer_set_known_state (bi[i], VLIB_BUFFER_KNOWN_FREE);
b = vlib_buffer_next_contiguous (b, fl->n_data_bytes);
}