Dumping core over NFS

[Andrew Duane]

We have a strange problem in 6.2 that we're wondering if anyone else has seen. If a process is dumping core to an NFS-mounted directory, sending SIGINT, SIGTERM, or SIGKILL to that process causes NFS to wedge. The nfs_asyncio starts complaining that 20 iods are already processing the mount, but nothing makes any forward progress.

Sending SIGUSR1, SIGUSR2, or SIGABRT seem to work fine, as does any signal if the core dump is going to a local filesystem.

Before I dig into this apparent deadlock, just wondering if it's been seen before.

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Andrew Duane
Juniper Networks
o   +1 978 589 0551
m  +1 603-770-7088
aduane at juniper.net