Re: kern/60220 (kernel panic after modifying floating-point status register)

[riastradh%NetBSD.org@localhost]

Synopsis: kernel panic after modifying floating-point status register

State-Changed-From-To: open->feedback
State-Changed-By: riastradh%NetBSD.org@localhost
State-Changed-When: Thu, 30 Apr 2026 23:57:51 +0000
State-Changed-Why:
I can't reproduce this, and access to mxcsr is certainly well-exercised
(we have various automatic tests of fenv access and floating-point
exception traps), so I suspect there is more to this than just mxcsr.
Can you share the following information?

1. cpuctl identify 0

2. dmesg

3. the full panic message including stack trace, either from dmesg when
   the machine reboots or from serial console output if you can capture
   it

4. if you can enter ddb when it crashes (sysctl -w ddb.onpanic=1), the
   output from `ps', `ps/w', and `show all tstiles'