https://bugs.kde.org/show_bug.cgi?id=428648
Bug ID: 428648
Summary: s390_emit_load_mem panics due to 20-bit offset for
vector load
Product: valgrind
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: vex
Assignee: jsew...@acm.org
Reporter: ar...@linux.ibm.com
Target Milestone: ---
With a fairly big test program based on Python3, Valgrind was seen to panic
with this message:
vex: the `impossible' happened:
s390_emit_load_mem
Where the host stacktrace contains this:
==13902== by 0x8001F3C73: s390_emit_load_mem (host_s390_defs.c:8451)
==13902== by 0x80020A701: emit_S390Instr (host_s390_defs.c:8516)
A bit of instrumentation shows that s390_emit_load_mem was invoked with an
addressing mode of S390_AMODE_B20, but with a size of 16 bytes. This means
that a vector load with 20-bit offset is requested, which is not supported.
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