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Differential D54478

powerpc: put the isync inside the TD_LOCK() checking loop
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Authored by adrian on Jan 3 2026, 10:54 PM.
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jhibbits
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PowerPC
Commits
rG666599639cf6: powerpc: put the isync inside the TD_LOCK() checking loop
rGa50789d8b89b: powerpc: put the isync inside the TD_LOCK() checking loop
rG8df2e5421468: powerpc: put the isync inside the TD_LOCK() checking loop
Summary

Fix a narrow window where the lock is unlocked but the checking CPU
hasn't flushed things appropriately.

I've seen this reliably trigger in qemu-system-ppc64 running power9 pseries
guests.

PR: kern/292167

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Repository
rG FreeBSD src repository
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Build Status
Buildable 69595
Build 66478: arc lint + arc unit

Event Timeline

adrian created this revision.Jan 3 2026, 10:54 PM
Herald added subscribers: jhibbits, imp. · View Herald TranscriptJan 3 2026, 10:54 PM
adrian requested review of this revision.Jan 3 2026, 10:54 PM
Harbormaster completed remote builds in B69595: Diff 168977.Jan 3 2026, 10:55 PM
adrian planned changes to this revision.Jan 3 2026, 10:55 PM
adrian added a reviewer: PowerPC.
adrian updated this revision to Diff 168979.Jan 3 2026, 11:32 PM

do 32 bit as well, thanks jhibbits

Harbormaster completed remote builds in B69596: Diff 168979.Jan 3 2026, 11:32 PM
adrian added a reviewer: jhibbits.Jan 3 2026, 11:33 PM
jhibbits accepted this revision.Jan 3 2026, 11:44 PM
This revision is now accepted and ready to land.Jan 3 2026, 11:44 PM
Closed by commit rG8df2e5421468: powerpc: put the isync inside the TD_LOCK() checking loop (authored by adrian). · Explain WhyJan 4 2026, 2:28 AM
This revision was automatically updated to reflect the committed changes.
adrian added a commit: rG8df2e5421468: powerpc: put the isync inside the TD_LOCK() checking loop.
adrian added a commit: rGa50789d8b89b: powerpc: put the isync inside the TD_LOCK() checking loop.Jan 11 2026, 7:24 PM
adrian added a commit: rG666599639cf6: powerpc: put the isync inside the TD_LOCK() checking loop.Jan 30 2026, 5:07 AM

Revision Contents
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PathSize
sys/
powerpc/
powerpc/
2 lines

Diff 168977

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sys/powerpc/powerpc/swtch64.S

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