Re: [linux-stable-rc:linux-4.9.y 9986/9999] ptrace.c:undefined reference to `abort'

[Arnd Bergmann <arnd@arndb.de>]

On Fri, Jul 5, 2019 at 6:15 PM Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
> On Sat, Jul 06, 2019 at 12:08:59AM +0800, kbuild test robot wrote:
> >    arch/arc/built-in.o: In function `arc_pmu_device_probe':
> > >> perf_event.c:(.text+0x99e6): undefined reference to `abort'
> >    arch/arc/built-in.o:perf_event.c:(.text+0x99e6): more undefined references to `abort' follow
>
> I've queued up af1be2e21203 ("ARC: handle gcc generated __builtin_trap
> for older compiler") to hopefully resolve this now.

Thanks, I remember the same problem happening in mainline now,
and this should solve the issue.

I also see that the backported patch that introduced the regression
has succeed in getting rid of many of the warnings in 4.9.y, and kernelci
itself does not run into the abort() issue because it has a different
compiler version:

https://kernelci.org/build/stable-rc/branch/linux-4.9.y/kernel/v4.9.184-93-gaf13e6db0db4/

All that remains now is

cc1: error: '-march=r3000' requires '-mfp32'
(.text+0x1bf20): undefined reference to `iommu_is_span_boundary'
(.text+0x1bbd0): undefined reference to `iommu_is_span_boundary'
warning: (SIBYTE_SWARM && SIBYTE_SENTOSA && SIBYTE_BIGSUR &&
SWIOTLB_XEN && AMD_IOMMU) selects SWIOTLB which has unmet direct
dependencies (CAVIUM_OCTEON_SOC || MACH_LOONGSON64 && CPU_LOONGSON3 ||
NLM_XLP_BOARD || NLM_XLR_BOARD)
arch/arc/kernel/unwind.c:188:14: warning: 'unw_hdr_alloc' defined but
not used [-Wunused-function]
drivers/clk/sunxi/clk-sun8i-bus-gates.c:85:27: warning: 'clk_parent'
may be used uninitialized in this function [-Wmaybe-uninitialized]
arch/arm64/kernel/vdso.c:127:6: warning: 'memcmp' reading 4 bytes from
a region of size 1 [-Wstringop-overflow=]

The two arm specific issues are fixed with these patches

4e903450bcb9 ("clk: sunxi: fix uninitialized access")
dbbb08f500d6 ("arm64, vdso: Define vdso_{start,end} as array")

The arc unwind fix needs to make it into mainline first, and the rest are mips
issues that may need a custom fix since there is no specific upstream
patch that could be backported.

      Arnd