pseudofs: Don't purge the cache on shutdown
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Authored by des on Jul 20 2026, 6:46 PM.

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rG2cc2d2f64f8a: pseudofs: Don't purge the cache on shutdown
rGdf9c6721f819: pseudofs: Don't purge the cache on shutdown
rGea65604407f4: pseudofs: Don't purge the cache on shutdown
rG4ebcdb8dd9a7: pseudofs: Don't purge the cache on shutdown

Summary

This is a waste of time and results in a use-after-free if linsysfs is
loaded and a USB network interface is in use, since USB devices are
disconnected at shutdown, which triggers a call into linsysfs, which
then tries to destroy a pseudofs node which has already been purged.

MFC after: 1 week
Reported by: glebius

Diff Detail

Repository

rG FreeBSD src repository

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Lint Skipped

Unit

Tests Skipped

Build Status

Buildable 74961
Build 71844: arc lint + arc unit

Event Timeline

des created this revision.Jul 20 2026, 6:46 PM

Herald added a subscriber: imp. · View Herald TranscriptJul 20 2026, 6:46 PM

des requested review of this revision.Jul 20 2026, 6:46 PM

Harbormaster completed remote builds in B74961: Diff 182300.Jul 20 2026, 6:46 PM

Thanks! While I'm 99% sure it is going to fix my panic, I can't test it right away. Traveling right now and machine that exhibits it is not with me. I'll be able to test next week. If you want you can delay the push until I test. I will report here, in this revision.

This revision is now accepted and ready to land.Jul 20 2026, 6:59 PM

@glebius have you been able to test?