Dear samtools developers

During an RNA-seq project i noticed an unusual output returned by idxstats. I 
managed to downsize the original sam file and to reproduce this issue with a 
mini sam file (small.sam) containing only two alignments(see attachment or end 
of email). i am using samtools-0.1.19 and performing the following commands:

samtools view -b -S small.sam > small.bam
samtools sort small.bam small.sorted
samtools index small.sorted.bam
samtools idxstats small.sorted.bam

chr1    541556283    1    0
chr2    541556283    11141270    27000832
*    0    0    0

i think the issue might be related to the fact that the chromosomes in that 
case are quite big. i would like to ask if this issue is related only to 
idxstats and if the sorted bam file and the index are still ok to work with.

Kind regards
Dimos Gaidatzis


sam file:
@HD    VN:1.0    SO:unsorted
@SQ    SN:chr1    LN:541556283
@SQ    SN:chr2    LN:541556283
@PG    ID:Bowtie    VN:1.0.1    
CL:"/work/gbioinfo/linux/lib64/R/library/Rbowtie/bowtie"
SRR306742.2253485    0    chr2    536900149    255    50M    *    0    0    
GTACTTAGTAGGTGTGTAGTGCATAGAATTTCAGACATTAACTCAGGAAG    
2FC9:>=C2;E9EA8AF8B>?D6D?CCC9EF@ABBE8C7D8:26@>6:5<    XA:i:0    MD:Z:36C13    
NM:i:1
SRR306742.1426453    0    chr1    541555283    255    50M    *    0    0    
AACGGAAGTACCATACTTTATCACAGCTCTTATTTACAGTGAAACTGAGT    
2FC9:>=C2;E9EA8AF8B>?D6D?CCC9EF@ABBE8C7D8:26@>6:5<    XA:i:0    MD:Z:36C13    
NM:i:1



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