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Libunit: fixed shared memory waiting.

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The nxt_unit_ctx_port_recv() function may return the NXT_UNIT_AGAIN code, in
which case an attempt to reread the message should be made.

The issue was reproduced in load testing with response sizes 16k and up.
In the rare case of a NXT_UNIT_AGAIN result, a buffer of size -1 was processed,
which triggered a 'message too small' alert; after that, the app process was
terminated.
This commit is contained in:
Max Romanov
2020-12-18 00:25:28 +03:00
parent 7389a50835
commit 7b669ed866
2 changed files with 11 additions and 1 deletions
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7
docs/changes.xml
View File

@@ -48,6 +48,13 @@ appeared in 1.19.0.
</para>
</change>
<change type="bugfix">
<para>
application processes could terminate unexpectedly under high load; the bug
had appeared in 1.19.0.
</para>
</change>
</changes>

5
src/nxt_unit.c
View File

@@ -3606,7 +3606,10 @@ nxt_unit_wait_shm_ack(nxt_unit_ctx_t *ctx)
return NXT_UNIT_ERROR;
}
res = nxt_unit_ctx_port_recv(ctx, ctx_impl->read_port, rbuf);
do {
res = nxt_unit_ctx_port_recv(ctx, ctx_impl->read_port, rbuf);
} while (res == NXT_UNIT_AGAIN);
if (res == NXT_UNIT_ERROR) {
nxt_unit_read_buf_release(ctx, rbuf);