Description of problem:
We hit this crash when adding/deleting devices:
The problem is that target_core_user calls tcmu_free_device -> tcmu_netlink_event (TCMU_CMD_REMOVED_DEVICE) -> uio_unregister_device. It does not wait for the TCMU_CMD_REMOVED_DEVICE userspace handler to close the uio device, so if the uio_unregister_device is faster than userspace we will hit the uio_release crash because the uio_device will be freed.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
Patch(es) committed on kernel repository and an interim kernel build is undergoing testing
Patch(es) available on kernel-3.10.0-690.el7
Regression tests on RHEL-7.4-20170630.1 w/ kernel-3.10.0-691.el7 have not found any new issue. Moving to VERIFIED as per comment#11
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.