[petsc-dev] use of uninitialized values in PetscSF

[Jed Brown]

Barry Smith <bsmith at mcs.anl.gov> writes:

>   Is there any way to fix this use of uninitialized values?

Hmm, I don't think it's something we have any control over.  I could try
making a reduced test case to put in MPICH's test suite.  Is this with
the latest version of MPICH?

> 9a10,67
>> ==31141== Syscall param writev(vector[...]) points to uninitialised byte(s)
>> ==31141==    at 0xD164CDB: writev (writev.c:51)
>> ==31141==    by 0xCB13596: MPL_large_writev (mplsock.c:32)
>> ==31141==    by 0xCB02DC9: MPIDU_Sock_writev (sock_immed.i:610)
>> ==31141==    by 0xCAC00DD: MPIDI_CH3_iStartMsgv (ch3_istartmsgv.c:110)
>> ==31141==    by 0xCA7DC91: recv_rma_msg (ch3u_rma_sync.c:2198)
>> ==31141==    by 0xCA79CB6: MPIDI_Win_fence (ch3u_rma_sync.c:1295)
>> ==31141==    by 0xC9AD840: PMPI_Win_fence (win_fence.c:111)
>> ==31141==    by 0x51DA7E1: PetscSFRestoreWindow (sfwindow.c:348)
>> ==31141==    by 0x51DD0C9: PetscSFBcastEnd_Window (sfwindow.c:510)
>> ==31141==    by 0x51D0B66: PetscSFBcastEnd (sf.c:1001)
>> ==31141==    by 0x401EB7: main (ex2.c:81)
>> ==31141==  Address 0xe50d12c is 108 bytes inside a block of size 208 alloc'd
>> ==31141==    at 0x4C2B6CD: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
>> ==31141==    by 0xCA7328D: MPIDI_CH3I_RMA_Ops_alloc_tail (mpidrma.h:191)
>> ==31141==    by 0xCA75A49: MPIDI_Get (ch3u_rma_ops.c:290)
>> ==31141==    by 0xC99EC9C: PMPI_Get (get.c:142)
>> ==31141==    by 0x51DCC62: PetscSFBcastBegin_Window (sfwindow.c:495)
>> ==31141==    by 0x51D03C4: PetscSFBcastBegin (sf.c:968)
>> ==31141==    by 0x401DDB: main (ex2.c:79)
>> ==31141==  Uninitialised value was created by a heap allocation
>> ==31141==    at 0x4C2B6CD: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
>> ==31141==    by 0xCA7328D: MPIDI_CH3I_RMA_Ops_alloc_tail (mpidrma.h:191)
>> ==31141==    by 0xCA75A49: MPIDI_Get (ch3u_rma_ops.c:290)
>> ==31141==    by 0xC99EC9C: PMPI_Get (get.c:142)
>> ==31141==    by 0x51DCC62: PetscSFBcastBegin_Window (sfwindow.c:495)
>> ==31141==    by 0x51D03C4: PetscSFBcastBegin (sf.c:968)
>> ==31141==    by 0x401DDB: main (ex2.c:79)
>> ==31141== 
>> ==31142== Syscall param writev(vector[...]) points to uninitialised byte(s)
>> ==31142==    at 0xD164CDB: writev (writev.c:51)
>> ==31142==    by 0xCB13596: MPL_large_writev (mplsock.c:32)
>> ==31142==    by 0xCB02DC9: MPIDU_Sock_writev (sock_immed.i:610)
>> ==31142==    by 0xCAC00DD: MPIDI_CH3_iStartMsgv (ch3_istartmsgv.c:110)
>> ==31142==    by 0xCA7DC91: recv_rma_msg (ch3u_rma_sync.c:2198)
>> ==31142==    by 0xCA79CB6: MPIDI_Win_fence (ch3u_rma_sync.c:1295)
>> ==31142==    by 0xC9AD840: PMPI_Win_fence (win_fence.c:111)
>> ==31142==    by 0x51DA7E1: PetscSFRestoreWindow (sfwindow.c:348)
>> ==31142==    by 0x51DD0C9: PetscSFBcastEnd_Window (sfwindow.c:510)
>> ==31142==    by 0x51D0B66: PetscSFBcastEnd (sf.c:1001)
>> ==31142==    by 0x401EB7: main (ex2.c:81)
>> ==31142==  Address 0xe49d88c is 108 bytes inside a block of size 208 alloc'd
>> ==31142==    at 0x4C2B6CD: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
>> ==31142==    by 0xCA7328D: MPIDI_CH3I_RMA_Ops_alloc_tail (mpidrma.h:191)
>> ==31142==    by 0xCA75A49: MPIDI_Get (ch3u_rma_ops.c:290)
>> ==31142==    by 0xC99EC9C: PMPI_Get (get.c:142)
>> ==31142==    by 0x51DCC62: PetscSFBcastBegin_Window (sfwindow.c:495)
>> ==31142==    by 0x51D03C4: PetscSFBcastBegin (sf.c:968)
>> ==31142==    by 0x401DDB: main (ex2.c:79)
>> ==31142==  Uninitialised value was created by a heap allocation
>> ==31142==    at 0x4C2B6CD: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
>> ==31142==    by 0xCA7328D: MPIDI_CH3I_RMA_Ops_alloc_tail (mpidrma.h:191)
>> ==31142==    by 0xCA75A49: MPIDI_Get (ch3u_rma_ops.c:290)
>> ==31142==    by 0xC99EC9C: PMPI_Get (get.c:142)
>> ==31142==    by 0x51DCC62: PetscSFBcastBegin_Window (sfwindow.c:495)
>> ==31142==    by 0x51D03C4: PetscSFBcastBegin (sf.c:968)
>> ==31142==    by 0x401DDB: main (ex2.c:79)
>> ==31142== 
> /sandbox/petsc/petsc.clone/src/vec/is/sf/examples/tutorials
> Possible problem with ex2_window, diffs above
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