Node.js app crashes when sending sending blob to db2

We are getting inconsistent errors. The app fails when we attempt to store file attachments. This issue seems very closely related to issue #141. We don’t get a lot of details in the logs but do see this come up after each crash:

ERR *** Error in `node’: double free or corruption (!prev): 0x00000000034e67e0 ***

We applied the following recommendations from issue #141:

1. var ibmdb = require(‘ibm_db’); var pool = new ibmdb.Pool(); … ibmdb.open();

With these changes, we have noticed a decrease in the failure rate but it is still occurring.

[cvogt]

@bimaljha what fixed it? Would love to read the commit

[bnoordhuis]

@rhtpandeyIN I think you misunderstand. It was my and Sam’s conclusion after reviewing the C++ code that it has several logic bugs where it frees memory prematurely or writes past the end of the buffer. You can find some examples + potential fixes here:

bnoordhuis/node-ibm_db@77e7398 bnoordhuis/node-ibm_db@42e24c7

There was much more actually (bnoordhuis/node-ibm_db@c404381) but in that commit it’s difficult to separate bug fixes from new code.

I don’t have time to pursue this but at least now you know where to look.