[petsc-users] Unconditional jump or move depends on uninitialised value(s)

[Barry Smith]

  Yes they matter; they cannot be ignored.

  The most likely cause is that you did not fill in certain entries in the vector during the function evaluation routine you set with SNESSetFunction(). Another possibility is if you provided a right hand side vector to the SNES (uncommon) that not all values in that vector have been filled in.

  If you call VecView() inside your function evaluation routine immediately after you have finished filling the vector it may help track down which entries you missed.


  Barry


> On Jun 9, 2023, at 3:24 PM, Tu, Jiannan <Jiannan_Tu at uml.edu> wrote:
> 
> To avoid warninigs about “unconditional jump or move depends on uninitialized value(s)”, I simplified my programs so that the warnings remain only through SNESSolve(). Some of them are appended below. My question is if such warnings really matter and affect the simulation results? <>
>  
> Thank you for your kind advice.
>  
> Jiannan
>  
> ==1988731== Conditional jump or move depends on uninitialised value(s)
> ==1988731==    at 0xA19178C: sqrt (w_sqrt_compat.c:31)
> ==1988731==    by 0x4EA9E4C: VecNorm_Seq (bvec2.c:227)
> ==1988731==    by 0x4F705C8: VecNorm (rvector.c:228)
> ==1988731==    by 0x6678D91: SNESSolve_NEWTONTR (tr.c:300)
> ==1988731==    by 0x673093F: SNESSolve (snes.c:4809)
> ==1988731==    by 0x122FA7: main (iditm3d.cpp:138)
> ==1988731==
> ==1988731== Conditional jump or move depends on uninitialised value(s)
> ==1988731==    at 0x667495C: PetscIsInfOrNanReal (petscmath.h:788)
> ==1988731==    by 0x6678E0C: SNESSolve_NEWTONTR (tr.c:301)
> ==1988731==    by 0x673093F: SNESSolve (snes.c:4809)
> ==1988731==    by 0x122FA7: main (iditm3d.cpp:138)
> ==1988731==
> ==1988731== Conditional jump or move depends on uninitialised value(s)
> ==1988731==    at 0xA347078: __printf_fp_l (printf_fp.c:387)
> ==1988731==    by 0xA360547: printf_positional (vfprintf-internal.c:2072)
> ==1988731==    by 0xA361DCC: __vfprintf_internal (vfprintf-internal.c:1733)
> ==1988731==    by 0xA376F99: __vsnprintf_internal (vsnprintf.c:114)
> ==1988731==    by 0x4A77784: PetscVSNPrintf (mprint.c:176)
> ==1988731==    by 0x4A77EF4: PetscVFPrintfDefault (mprint.c:292)
> ==1988731==    by 0x4BCBB92: PetscViewerASCIIPrintf (filev.c:607)
> ==1988731==    by 0x674764B: SNESMonitorDefault (snesut.c:296)
> ==1988731==    by 0x6728A3E: SNESMonitor (snes.c:4059)
> ==1988731==    by 0x6679743: SNESSolve_NEWTONTR (tr.c:309)
> ==1988731==    by 0x673093F: SNESSolve (snes.c:4809)
> ==1988731==    by 0x122FA7: main (iditm3d.cpp:138)
> ==1988731==
> ==1988731== Conditional jump or move depends on uninitialised value(s)
> ==1988731==    at 0xA342B34: __mpn_extract_double (dbl2mpn.c:56)
> ==1988731==    by 0xA34738E: __printf_fp_l (printf_fp.c:387)
> ==1988731==    by 0xA360547: printf_positional (vfprintf-internal.c:2072)
> ==1988731==    by 0xA361DCC: __vfprintf_internal (vfprintf-internal.c:1733)
> ==1988731==    by 0xA376F99: __vsnprintf_internal (vsnprintf.c:114)
> ==1988731==    by 0x4A77784: PetscVSNPrintf (mprint.c:176)
> ==1988731==    by 0x4A77EF4: PetscVFPrintfDefault (mprint.c:292)
> ==1988731==    by 0x4BCBB92: PetscViewerASCIIPrintf (filev.c:607)
> ==1988731==    by 0x674764B: SNESMonitorDefault (snesut.c:296)
> ==1988731==    by 0x6728A3E: SNESMonitor (snes.c:4059)
> ==1988731==    by 0x6679743: SNESSolve_NEWTONTR (tr.c:309)
> ==1988731==    by 0x673093F: SNESSolve (snes.c:4809)

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20230609/2a192665/attachment-0001.html>