[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
Re: port-amd64/53789: amd64-install.img boot hangs on HP Compaq 8200 Elite
The following reply was made to PR port-amd64/53789; it has been noted by GNATS.
From: Andreas Gustafsson <gson%gson.org@localhost>
Subject: Re: port-amd64/53789: amd64-install.img boot hangs on HP Compaq 8200 Elite
Date: Mon, 14 Jan 2019 21:12:59 +0200
This bug is fixed, but I have one more comment for the record.
I was wondering why this caused a silent hang rather than a panic, and
I now have what seems like a plausible theory. When aprint_error_dev()
uses the NULL dev pointer, it takes the address of the dv_xname field
and ends up with a pointer containing a small positive integer which
is then passed to printf() and dereferenced while holding kprintf_mtx.
Presumably this then traps, but printing the trap message tries to
reacquire kprintf_mtx and deadlocks.
Andreas Gustafsson, gson%gson.org@localhost
Main Index |
Thread Index |