On 10 December 2017 at 18:24, Peter Maydell <peter.mayd...@linaro.org> wrote: > On 8 December 2017 at 23:09, Emilio G. Cota <c...@braap.org> wrote: >> On Thu, Oct 12, 2017 at 17:03:31 +0100, Peter Maydell wrote: >>> Refactor the Thumb decode to do the loads of the instruction words at >>> the top level rather than only loading the second half of a 32-bit >>> Thumb insn in the middle of the decode. > >> This commit breaks the debian-arm boot test (see [1]), boot dies at: >> >>> random: systemd urandom read with 4 bits of entropy available >>> systemd[1]: Caught <SEGV>, core dump failed. >>> systemd[1]: Freezing execution. >> >> Sorry I noticed this so late (-rc4), for a while I thought my development >> was causing this and didn't pay much attention to it. However, just realised >> the problem is present on master. Bisect log below. > > It's missed the deadline for getting fixed in 2.11, but I'll have > a look at what's going on here.
This is a really bad bug -- we accidentally stopped generating UNDEF for 32-bit Thumb2 instructions that should UNDEF (including things like "first use of FPU with FPU disabled", which is probably why systemd falls over). I wish we'd noticed this a week ago :-( Patch coming in a moment, anyway. thanks -- PMM
