Hi, On Mon, Apr 09, 2018 at 06:22:53PM +0300, Dmitry V. Levin wrote: > There seems to be a regression in v4.16 on ppc compat very similar > to sparc compat regression reported earlier at > https://marc.info/?l=linux-sparc&m=151501500704383 . > > The symptoms are exactly the same: the same signal_receive test from > the strace test suite fails with the same diagnostics: > https://build.opensuse.org/public/build/home:ldv_alt/openSUSE_Factory_PowerPC/ppc/strace/_log
The log is big, just look for "KERNEL BUG".
> Unfortunately, I do not have any means to investigate further,
> so just passing this information on to those who care.
OK, the faulty commit is v4.16-rc1~159^2~39
("signal/powerpc: Document conflicts with SI_USER and SIGFPE and SIGTRAP").
One might think that a commit called "Document conflicts" shouldn't
introduce an ABI regression, but this one definitely does by defining
FPE_FIXME and TRAP_FIXME in arch/powerpc/include/uapi/asm/siginfo.h
that affect siginfo_layout().
A similar commit v4.16-rc1~159^2~37
("signal/arm: Document conflicts with SI_USER and SIGFPE") must have
introduced a similar ABI regression to compat arm.
An earlier commit v4.14-rc1~60^2^2~5
("signal/sparc: Document a conflict with SI_USER with SIGFPE") introduced
a similar ABI regression to compat sparc.
There is a clear pattern of sneaking in ABI changes using innocently
looking commit messages.
--
ldv
signature.asc
Description: PGP signature
