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[ Upstream commit50e43a5733] We get there when sigreturn has performed obscene acts on kernel stack; in particular, the location of pt_regs has shifted. We are about to call syscall_trace(), which might stop for tracer. If that happens, we'd better have task_pt_regs() returning correct result... Fucked-up-by: Al Viro <viro@zeniv.linux.org.uk> Fixes:bd6f56a75b("m68k: Missing syscall_trace() on sigreturn") Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Tested-by: Michael Schmitz <schmitzmic@gmail.com> Reviewed-by: Michael Schmitz <schmitzmic@gmail.com> Tested-by: Finn Thain <fthain@linux-m68k.org> Link: https://lore.kernel.org/r/YP2dMWeV1LkHiOpr@zeniv-ca.linux.org.uk Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Sasha Levin <sashal@kernel.org>