[DragonFlyBSD - Bug #3392] (Feedback) random but serious system hangs after pmap/vm wiring changes

[liweitianux]

Issue #3392 has been updated by liweitianux.

Subject changed from dm_target_crypt causes random but serious hangs to random but serious system hangs after pmap/vm wiring changes
Status changed from New to Feedback

As mentioned in bug #3421, the hang seems to be solved (or almost solved) by the "pmap wiring fix in commit":https://gitweb.dragonflybsd.org/?p=dragonfly.git;a=commitdiff;h=3d7bc7325a7d08499e36389668c21eac68ccca4f.

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Bug #3392: random but serious system hangs after pmap/vm wiring changes
http://bugs.dragonflybsd.org/issues/3392#change-14723

* Author: mneumann
* Status: Feedback
* Priority: Normal
* Category: Crypto
* Target version: 6.6
* Start date: 2026-01-22
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Tested with HEAD as of Tue Jan 20, 2026 (868971441c9e703282089412240c0361dd9687fd)

Since commit 41fb76421dce (vkernel: Restore MAP_VPAGETABLE), shutdown hangs, reporting:

"malloc_uninit: 120 bytes of 'HAMMER2-msg' still allocated on cpu 8".

It also takes unusually long between running "halt -p" and the start of the shutdown procedure.

The next boot then hangs within "Mounting tmpfs at /var/run/shm".

Chrome also once seemed to fail starting (or it took unusual long for me to think it failed).

One other person has also reported some strange timeouts happening with commit "41fb76421dce" (reported on IRC). 

Screenshots attached, starting the "hang" on shutdown and boot.

---Files--------------------------------
bug1.small.jpg (723 KB)
bug2.small.jpg (630 KB)


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