docs/internals/3_8_BUGSTATUS.txt

Bugs reported after the release of 3.8.0
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This file lists bugs that were reported after 3.8.0 was released, both
in 3.8.0 and trunk, and that have not been closed.  Bugs that have
been closed as "fixed" are listed in the top level NEWS file instead.
In other words they get listed here first and moved to NEWS if they
get fixed.

This file also tracks commits & fixes that should be pushed to the 3.8
branch.

-- PUSH TO 3_8_BRANCH

(B38=2500)  2469   Fix a mixup ..
(B38=12930) 12873  n-i-bz: Use -s USR1 instead of -10 to send SIGUSR1 signal
(B38=12931) 12874  n-i-bz: shmat of a segment > 4Gb does not work
(B38=12933) 12878  n-i-bz: On Darwin, use __NR_poll_nocancel rather than __NR_poll
(B38=12934) 12879 + 12882 + 12883 (301281, OSX hang on "system")
(B38=12936) 12881  ptrace mips stuff
(B38=12938) 12885  (Iop_DPBtoBCD and Iop_BCDtoDPB fix)
(B38=2502)  2475   (289584: Handle a reg-reg encoding of MOVAPS)
(B38=2503)  2476   (305042: Implement 0F 7F encoding of movq reg-reg)
(B38=12940) 12887  (n-i-bz: libmpiwrap.c fixes)
(B38=2504)  2477   (305321: Re-enable 'prefetch m8' and 'prefetchw m8')
(B38=2505)  2478   (295808: Fix LZCNT and TZCNT properly)
(B38=2506)  2479   (305199: Implement QDADD and QDSUB)
(B38=2507)  2480   (304867: Implement MOVBE in 32 bit mode)
(B38=12941) 12891  (304980: Fix up range checking in ML_(addLineInfo))
(B38=12942) 12892  (305513: Fix skipping of block forms)
(B38=12943) 12893  (298281: Implement a wrapper for wcslen on Linux)
(B38=12944) 12894  (n-i-bz, exp-sgcheck memcpy)
(B38=12945) 12897/8 (305690: Handle non-zero sem_*wait() return values correctly)
(B38=2508)  2499   (305926: Invalid alignment checks for some AVX instructions)
(B38=12946) 12923  (304980: Guard against negative symbol sizes)
(B38=12948) 12947  (n-i-bz: volatile in stack check, re clang)
(B38=12984) 12964  (306310  3.8.0 release tarball missing some files)
(B38=2534)  2517/8 (n-i-bz: fix a couple of union tag-vs-field mixups)
(B38=2535)  2531   (306297: ARM: STM<c>.W <Rn>{!}, <registers> too strict)
(B38=2536)  2532   (306664: AMD64: Fix PCMPxSTRx variant $0x46)
(B38=12985) 12982  (306612: Intercept __GI_memmove)
(B38=2537,12986)
            2533,12980
                   (304035: ARM: uqsub16 shadd16 uhsub8 uhsub16)

-------- Bugs brought forward from 3_7_BUGSTATUS.txt --------

291310  FXSAVE instruction marks memory as undefined on amd64
  x86 vs amd64 inconsistency?
  **is fixed in 3.8.0, but was not marked as such
  ** no it's not; v38BRANCH shows error, vTRUNK doesn't -- investigate
  REOP

-------- Unfixed in 3.8.0

303741  sockaddr* parameter of recvfrom not handled correctly
        (corruption not detected later on)
  SYSCALL, HAS_TESTCASE

303877  valgrind doesn't support compressed debuginfo sections.
  QUERIED

304259  support Darwin 12 (Mac OS 10.8, Mountain Lion)
  OSX108 (Canonical)

304321  m_signals.c:2314 (sync_signalhandler_from_kernel):
        Assertion 'tid != 0' failed
  CLOSED as UNMAINTAINED.

304450  time logging tools ?
  WISHLIST

304675  make install-strip fails when cross-compiling
  w/ one-liner patch; but needs checking (should be more general?
  assumes auto* version?)

304676  regtest hangs on mac OS X (mchelp, coolo_sigaction, system)
  probably related to 301281 et al.  Still valid.
  OSX

305170  linux: add FIOCLEX and FIONCLEX ioctls
  SYSCALL.  w/ patch, looks pretty harmless

n-i-bz  exp-sgcheck asserts on gcc-4.6.2 generated Dwarf3

305957  m_debuginfo/d3basics.c:965 (vgModuleLocal_evaluate_GX):
        Assertion 'aMin == (Addr)0' failed.
        QUERIED -- no info so far -- close?

306004  Wishlist: port valgrind to sparc
   WISHLIST

-- Sat 1 Sept 2012 10pm

306171  Boost.Context appears to cause Valgrind to crash
   Stack switching; should fix.  (Conservative unwind?)

306235  unhandled syscall: 429 (freebsd)
   Need to forward to FreeBSD port maintainers.

306299  Internal error when running a winelib application
   Conservative unwind?

306340  parse_var_DIE confused by DWARF from clang-3.1
   Might be quite simple to fix; need to investigate.
   No action so far

306535  massif: force dump result every X minutes
   Queried

306587  data cache line size is 128 and instruction cache line size is 32
   PPC; obscure, needs investigatoin

306590  not support e500v2 spe 0x216 command
   PPC SPE insns; with plausible looking patch?  Need test cases, and
   cc Mehafy.

286864 strlen function redirection error
   Gentoo glibc "miscompilation"; is this important?

-- Mon 17 Sept 2012, 10 am

valgrind.spec diff at https://bugzilla.mozilla.org/show_bug.cgi?id=750856#c20
r13008 to 382 ?  check
change of leak-check-counting?  307465
gkw extra suppression?
gcp libnss3.so debuginfo read hang

306947  s390x: BFP rounding mode improvements
        Proposal, no action

306949  s390x: BFP condition code improvements
        Proposal, no action

211352  helgrind races in helgrind's own mythread_wrapper
        NEEDINFO

307367  amd64->IR: 0xF2 0x48 0xF 0x5F 0x3E 0xF2 0x48 0xF
        redundant-REX, should be easy to fix

307399  amd64->IR: 0xC4 0x62 0x55 0x2E 0x18 0x44 0x39 0x87
        (vmaskmovps %ymm11,%ymm5,(%rax))
        CONDITIONAL STORES -- probably fixed?

307415  3.8.1 build error - OSX Lion 10.7.4 duplicate symbol
        _mach_make_memory_entry
        OSX or XCode 4.5

307500  Valgrind docs have two <title> tags
        QUERIED (unclear how to fix)
        Severity: low

308027  Warning: negative range in .debug_loc section
        QUERIED -- not sure this needs fixing or not

79362   Debug info is lost for .so files when they are dlclose'd
        Still alive!

308158  running with --leack-check=full makes valgrind exit
        FreeBSD -- although FreeBSD maintainers may not be aware

------ Thu Oct 11 18:51:26 CEST 2012

197915  80-bit floats are not supported on x86 and x86-64
        indeed, yes.

299316  Helgrind: hg_main.c:628 (map_threads_lookup): Assertion 'thr'
        failed.
        OSX Helgrind

308582  massif: wrong stack usage at exit of threaded program
        No action so far

308668  pthread rwlock_rdlock doesn't understand modifications in
        some cases (Helgrind)
        Real; no action so far

308729  vex x86->IR: unhandled instruction bytes 0xf 0x5
        HAS_PATCH, but NEEDINFO

243232 *Inconsistent Lock Orderings report with trylock (PBOS?)
        Almost certainly real (+ probably a dup).  No action so far.

237920  valgrind segfault on fork failure
        Uninvestigated; filed by JJ

308816  valgrind GPF in signal handler context 3.8.1 (allignment 
        Needs investigation
        Maybe fixed?

309100  s390x: Testcases for extended BFP
        No action so far

309430  Self hosting ppc64 encounters a vassert error on operand type
        No action so far.  Sounds a bit strange.

309554  Unhandled syscall remap_file_pages (216)
        No action so far
        Possibly difficult to implement

309721  add client request returning current value of a statistic (e.g. Ir)
        Wishlist.  No action yet.

309783  Valgrind does not support separate source and build directories
        Has patch, but needs further checking
        Does not appear to be much enthusiasm for this

309827 *add support for nvidia (nvmem) ioctls
        A bunch of Android hackery from VladV; needs pulling apart
        FIX 3.9 (commit)

309831  3.8.1: disInstr(arm): unhandled instruction: 0xECECA102
        (stcl, gdb disassembles to stfp) .. IWMMXT
        ==309604

310188  need better diagnostic when mmap() fails with EINVAL
        No patch so far
        Severity: low

310692  [coregrind] Thread scheduling regression?
        Spinlockery
        Severity: med  Audience: low

311093  massif and memcheck fail to redirect malloc calls on
        statically linked application
        Probably INVALID

-- Wed Dec  5 23:41:20 CET 2012

311544  sys_fork() calls VG_(do_atfork_pre)() AFTER forking()
        FIX 3.9 (easy)

311649  exhausting fds can leak created files
        Probably true; NEEDINFO; possible WONTFIX; QUERIED

311655  --log-file=FILE leads to apparent fd leak ("Open file
        descriptor 3: $LOGFILE")
        Probably true; should fix.
        Severity: med  Audience: low

311827  OS X 10.8.2 (eq_SyscallStatus): the 'impossible' happened.
        OSX10.8  Maybe fixed in the trunk already.  QUERIED

312989  ioctl handling needs to do POST handling on generic ioctls and
        needs to handle BPF ioctls
        OSX10.8 FIX 3.9 (commit)

313275  False positives for shared memory semaphores/mutexes/conditions
        No action so far.  Has testcase patches.
        Potentially important to fix, but does not look easy.

313276  helgrind does not recognize shared memory initialized
        semaphores, mutexes, conditions
        == 313275, pretty much
        Severity: med  Audience: low

313875  cr_libinit.c:183 cri_init: sigaction() failed: Invalid argument
        No action so far
        Severity: high  Audience: low

** [Bug 291310] FXSAVE instruction marks memory as undefined on amd64
        Severity: med  Audience: low

314236  OS X 10.8 testsuite build failure: test million.o
        OSX108  No action so far.
        Severity: low  Audience: med

314365  enable VEX to run asm helpers that do callee register saving
        In progress; not sure whether this is a good idea

-- Thu Feb 28 09:54:56 CET 2013

315936  UNKNOWN task message [id 3403, to mach_task_self(), reply
        0x2603] when running fork()ing tests on Mac OS X
        OSX10.8

315952  tun/tap ioctls are not supported
        QUERIED; leaving open for now
        Severity: med  Audience: low

316034  Building valgrind with gcc (4.7, trunk) fails on MacOS X 10.8
        Probably WONTFIX.

-- Mon Mar  4 11:36:17 CET 2013

294285  --partial-loads-ok does not work for 16-byte SSE loads
        FIXED (multiple commits)
        Requires regtest hookup on ppc

316382  Support for AMDs FMA4 instructions seem to be missing
        No action so far
        Severity: high  Audience: low

316528  Dump for cachegrind
        Wishlist

316612  A -Wunused-value warning from Clang when including memcheck.h
        Probably needs doc update
        Severity: low  Audience: med

316696  fluidanimate program of parsec 2.1 stuck (do not finish
        for more than 5 hours)
        No action so far (DRD specific)
        NEEDINFO
        Severity: high  Audience: low

316874  amd64->IR: 0xC4 0xE2 0xF8 0xF2 0x85 0x30 0xFF 0xFF
        Probably some AMD FMA insn?
        Severity: high  Audience: low

316903  memcheck/tests/origin5-bz2 FAIL with gcc-4.5+
        Possibly a real bug
        Severity: med  Audience: med

317078  _mm_madd_epi16, undefined * 0 should not give uninitialised result
        True, but probably difficult to fix without perf hit
        Prio: low

317127  Fedora18/x86_64 --sanity-level=3 : aspacem segment mismatch
        Diagnosed (BTRFS specific); unclear what to do, if anything

317208  vex x86->IR: unhandled instruction bytes: 0xC8 0x0 0x0 0x0
        "enter $0,$0" created by D language compiler
        Severity: high  Audience: low

317381  helgrind warns about xchg vs suppressed store
        No action so far.  Not sure there's an easy fix for this.
        Severity: med  Audience: low

317390  Patch for FBLD/FBSTP/FTST
        Needs cleanup+test cases.  Queried.
        Severity: high  Audience: low

317441  Add support for AMD's LWP (LightWeight Profiling) architecture
        extension
        Contains plausible infrastructure patch; no insns so far tho
        This is going to need some working through.  Probably OK.
        Not sure if can make 3.9.
        Severity: high  Audience: low

317698  parse_var_DIE: confused by: DW_TAG_compile_unit using
        Intel 13.0 update 3 compiler
        Reporter has queried Intel since this might be an ICC bug
        NEEDINFO
        Severity: med  Audience: low

317893  massif terminates without any message
        Probably just a memory limit thing.  Close as a dup, but of what?
        NEEDINFO

318030  addHRegUse takes a lot of CPU time; band-aid speedup
        patch within
        No action so far
        Needs review; would be nice to redo this with a more robust API

Thu Apr 11 18:16:04 CEST 2013

319237  [PATCH] Added support for ELF injection
        FreeBSD-specific

319274  unhandled syscall: unix:410
        OSX108-specific

319306  gdbserver tests call vgdb without path; patch within
        Needs further discussion?

319307  Patches to let test suite run in parallel
        Looks plausible
        Wishlist, effectively (has patch)

319393  bad rounding in cvtsi2ss instruction
        Not started.  Looks valid.  (double rounding)
        Severity: med  Audience: low

319419  unhandled syscall: unix:369
        OSX108-specific

319547  helgrind gives false positives on rwlocks
        Needs investigation.  Quite possibly a real bug.
        Severity: med  Audience: med

319896  vex amd64->IR: 0x8C 0xE0
        Probably requires proper segment support, but need to check.
        Severity: high  Audience: low

320082  disInstr(thumb): unhandled instruction on instruction LDRB
        Has patch
        LDRB; surely already supported?  Queried.
        MMhmh, untestable?
        Severity: high  Audience: low

320100  Add nanosecond timer support
        A bigger patch depends on it, but that has not appeared yet
        Wishlist, + as yet incomplete

320546  valgrind exits with "Assertion 'in_rx' failed"
        for /system/lib/libva-android.so on Android 4.0.4
        Need more info (the .so); queried.
        MAYBE FIX 3.9 (potentially serious)

320965  Unrecognised instruction __ieee754_pow_sse2
        Not sure what this is.  Queried.
        Severity: high  Audience: low (??)

321396  Add Support for Freescale e500v2 SPE Architecture.
        Is metabug? -- no patch, no details

321400  Add Support for Freescale e5500 Architecture.
        No patch, no details

321401  Add Support for Freescale e6500 Architecture.
        No patch, no details

321681  printf false positive
        Severity: med  Audience: low

321836  valgrind cross compilation failure on Ubuntu machine
        MIPS specific?

Tue Jul  2 12:15:07 CEST 2013

321888 *Unhandled instruction: LDRH (Thumb)
        Has patch; plausible (needs checking)
        FIX 3.9 (commit)

321892 *Unhandled instruction: LDRSH (Thumb)
        Has patch; plausible (needs checking)
        FIX 3.9 (commit)

321902 *disInstr(ARM): 0xECECA102
321903  == 321902
        MAYBE 3.9 (query vgolubev)

322150  Add Support for Cavium Octeon Instructions
        MIPS64; has patch; assigned to Petar
        MAYBE 3.9 (query Petar)

322256  Provide more callstacks on memory pool related errors
        Contains plausible patch; needs looking at
        Severity: low  Audience: low

322258  No thread notification is printed if new thread reused tid of 
        old thread that triggered last error
        Contains plausible patch.  Is bug fix.  (should take)
        FIX 3.9 (commit)

322586  Unknown instruction (bextr) in ld-2.15.so with --march=native on AMD FX-8350
        AMD specific.  Uninvestigated.
        Severity: high  Audience: low (??)

322593  Power 8 code to implement Transactional support
        Implements pass-to-host scheme; not intended to land.
        Severity: low (right now)  Audience: low

322621  False positives with pthread_barrier_wait / helgrind
        Severity: med  Audience: low

323020  more mysteries in valgrind thread stack handling
        QUERIED
        Severity: med  Audience: low

323046  Implement ANNOTATE_THREAD_NAME() Hellgrind annotation
        Request for implementation
        QUERIED .. is 322254 good enough?
        Severity: low  Audience: med

323178 *Unhandled instruction: PLDW register (ARM)
        Has patch; plausible (needs checking)
        FIX 3.9 (commit)

323179 *Unhandled instruction: PLDW immediate (ARM)
        Has patch; plausible (needs checking)
        FIX 3.9 (commit)

323268  New calls for custom memory allocators
        Obscure; needs investigation
        Severity: low  Audience: low

323431  vex amd64->IR: 0x8F 0xE8 0x78 0xA2 0xC1 0x40 0xC5 0xFB
        AMD-specific?
        Severity: high  Audience: low (??)
        FIX 3.9 if can do it at no risk and no CPUID hassle
        -- ask mjw

323448  Check for memory overlap in sprintf()-like functions
        Severity: low  Wishlist

323464  VALGRIND_MEMPOOL_ALLOC problems with size >= 2^32
        64-bit uncleanness; no action so far; QUERIED
        Severity: med  Audience: low

323777 *Documentation does not warn of sgcheck+darwin incompatibility
        FIX 3.9

324050  Helgrind: SEGV because of unaligned stack when using movdqa
        Needs to be looked at.  Is this real, or some Gentoo-caused
        breakage?
        Severity: high (hg crash)  Audience: low

324078  Track and show in logs which thread allocated memory
        Probably sync-event-loss in Helgrind
        Severity: high  (hg correctness bug?)  Audience: low

324081  3.8.1 Valgrind periodically hangs in long-running application
        NEEDINFO (requested)

324261  errorcount in xml output remains empty (no error pairs mentioned)
        Hmm, looks like a real bug.
        Severity: med  Audience: low

324486  WARNING: unhandled syscall: 310
        == 166355
        Hmm, tricky, sys_unshare.
        Severity: high  Audience: low

324525  valgrind can not detect any leak
        PROBABLE INVALID; needs closing.
        Severity: med  Audience: low

324809  show nightly regression tests results (and later performance) in a
        nice html page on valgrind.org
        In progress
        Severity: low  Audience: low

324882  CPUID should depend on VEX capabilities, not on underlying CPU
        Middle-term cleanup; not urgent

Thu Sep 19 10:34:49 CEST 2013