9fc3c01a1f
The state machine in the hv_utils driver can run out of order in some corner cases, e.g. if the kvp daemon doesn't call write() fast enough due to some reason, kvp_timeout_func() can run first and move the state to HVUTIL_READY; next, when kvp_on_msg() is called it returns -EINVAL since kvp_transaction.state is smaller than HVUTIL_USERSPACE_REQ; later, the daemon's write() gets an error -EINVAL, and the daemon will exit(). We can reproduce the issue by sending a SIGSTOP signal to the daemon, wait for 1 minute, and send a SIGCONT signal to the daemon: the daemon will exit() quickly. We can fix the issue by forcing a reset of the device (which means the daemon can close() and open() the device again) and doing extra necessary clean-up. Signed-off-by: Dexuan Cui <decui@microsoft.com> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
||
|---|---|---|
| .. | ||
| Build | ||
| Makefile | ||
| hv_fcopy_daemon.c | ||
| hv_get_dhcp_info.sh | ||
| hv_get_dns_info.sh | ||
| hv_kvp_daemon.c | ||
| hv_set_ifconfig.sh | ||
| hv_vss_daemon.c | ||
| lsvmbus | ||
| vmbus_testing | ||