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 PNkQnsYn 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is delivered. And the reason for that is >> to prevent the involved process from accessing the hwpoisoned >> page again. >> >> Since then a lot has changed, a hwpoisoned page is marked and >> upon being re-accessed, the process will be killed immediately. >> So let's take out the '!unmap_success' factor and try to deliver >> SIGBUS if possible. > I am missing some details here. > An unmapped hwpoison page will trigger a fault and will return > VM_FAULT_HWPOISON all the way down and then deliver SIGBUS, > but if the page was not unmapped, how will this be catch upon > re-accessing? Will the system deliver a MCE event? > I actually managed to hit the re-access case with an older version of Linux - MCE occurred, but unmap failed,  no SIGBUS and test process re-access the same address over and over (hence MCE after MCE), as the CPU was unable to make forward progress.   In reality, this issue is fixed with kill_accessing_processes().  The comment for this patch refers to comment made about '!unmap_access' long time ago. thanks, -jane