[tun_pkt]: Wait for AsyncSniffer to init fully #10346
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Signed-off-by: Lawrence Lee <[email protected]>
prsunny
reviewed
Mar 25, 2022
| self.sniffer.start() | ||
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| while not hasattr(self.sniffer, 'stop_cb'): | ||
| time.sleep(0.1) |
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I think, we can have a 1second wait here as 0.1 may be too aggressive
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Did some testing, it looks like it takes about 0.2 seconds to initialize, might be ok to keep 0.1 seconds so we can start the service ASAP?
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prsunny
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Mar 29, 2022
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qiluo-msft
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Fix for Tunnel packet handler can crash at system startup Signed-off-by: Lawrence Lee <[email protected]>
liushilongbuaa
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Signed-off-by: Lawrence Lee [email protected]
Why I did it
Tunnel packet handler can crash at system startup:
This is due to a race condition between netlink messages being sent by the kernel and the
AsyncSnifferobject inititalizing fully. It is possible for a netlink message to arrive and trigger a sniffer restart prior to the sniffer initializing itsself.stop_cbvariable, since the variable creation happens during the sniffer startup rather than during the creation of the sniffer object. If this occurs, the tunnel_packet_handler attempts to stop the sniffer, but this operation fails becauseself.stop_cbdoesn't exist yet.How I did it
After creating the sniffer object, block until the
self.stop_cbattribute has been created.How to verify it
Run
sudo systemctl restart swssand verify the tunnel packet handler does not crashWhich release branch to backport (provide reason below if selected)
Description for the changelog
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)