https://bugs.kde.org/show_bug.cgi?id=443314
Bug ID: 443314
Summary: In the latest GIT version, Valgrind with
"--trace-flags" crashes at "al" register
Product: valgrind
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 142148
--> https://bugs.kde.org/attachment.cgi?id=142148&action=edit
Reproducer
SUMMARY
Valgrind trace (debug) crashes at "al" register after GIT commits 22bae4b1 and
61307ee8.
STEPS TO REPRODUCE
Attached a reproducer (al_test.c).
1. Compile the attached file:
> gcc al_test.c
2. Run it under Valgrind with debugging:
> valgrind --trace-flags=10000000 --trace-notbelow=0 ./a.out > vg_trace
OBSERVED RESULT
The trace file ends with an error message:
vex: priv/guest_amd64_toIR.c:946 (nameIReg): Assertion `reg >= 4 && reg < 8'
failed.
vex storage: T total 53281728 bytes allocated
vex storage: P total 512 bytes allocated
valgrind: the 'impossible' happened:
LibVEX called failure_exit().
host stacktrace:
==442872== at 0x580285F2: show_sched_status_wrk (m_libcassert.c:406)
==442872== by 0x580286F7: report_and_quit (m_libcassert.c:477)
==442872== by 0x58028935: vgPlain_core_panic_at (m_libcassert.c:553)
==442872== by 0x5802895A: vgPlain_core_panic (m_libcassert.c:563)
==442872== by 0x58040112: failure_exit (m_translate.c:766)
==442872== by 0x580FE9A8: vex_assert_fail (main_util.c:249)
==442872== by 0x5813EF4D: nameIRegRexB (guest_amd64_toIR.c:946)
==442872== by 0x58158F03: dis_ESC_NONE.isra.50 (guest_amd64_toIR.c:21060)
==442872== by 0x581A35C7: disInstr_AMD64_WRK (guest_amd64_toIR.c:32980)
EXPECTED RESULT
The trace file does not contain error messages
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version:
KDE Frameworks Version:
Qt Version:
ADDITIONAL INFORMATION
The cause is, function "nameIRegRexB" classifies "al" as "irregular", while
other functions, like "getIRegRexB", correctly classify it as regular.
Attached a fix (al_debug_fix.patch).
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