Bug #9857: rbd readahead division by zero exception - rbd - Ceph

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Bug #9857

closed

rbd readahead division by zero exception

Added by Jason Dillaman over 9 years ago. Updated over 9 years ago.

Status:

Resolved

Priority:

Normal

Assignee:

Jason Dillaman

Target version:

% Done:

Source:

other

Tags:

Backport:

Regression:

Severity:

3 - minor

Reviewed:

Affected Versions:

ceph-qa-suite:

Pull request ID:

Crash signature (v1):

Crash signature (v2):

Description

When using old-format RBD images, the RBD readahead block alignments are initialized to zero because the stripe parameters haven't yet been configured.

#0  Readahead::_compute_readahead (this=0x6635c0, limit=1024106552) at common/Readahead.cc:84
#1  0x00007ffff5047a45 in Readahead::update (this=0x6635c0, extents=std::vector of length 1, capacity 1 = {...}, limit=1024106552) at common/Readahead.cc:33
#2  0x00007ffff74e0be6 in librbd::readahead (ictx=0x663150, image_extents=std::vector of length 1, capacity 1 = {...}, conf=<value optimized out>)
    at librbd/internal.cc:3614
#3  0x00007ffff74e460f in librbd::aio_read (ictx=0x663150, image_extents=std::vector of length 1, capacity 1 = {...}, buf=0x0, pbl=0x6cb5b8, c=0x6c9b00)
    at librbd/internal.cc:3669
#4  0x00007ffff74e5032 in librbd::aio_read (ictx=0x663150, off=37748736, len=4194304, buf=0x0, bl=0x6cb5b8, c=0x6c9b00) at librbd/internal.cc:3590
#5  0x00007ffff74c2772 in librbd::Image::aio_read (this=<value optimized out>, off=37748736, len=4194304, bl=..., c=0x6c9ae0) at librbd/librbd.cc:698
#6  0x0000000000417f86 in AioExportContext (argc=<value optimized out>, argv=<value optimized out>) at rbd.cc:1033
#7  do_export (argc=<value optimized out>, argv=<value optimized out>) at rbd.cc:1123
#8  main (argc=<value optimized out>, argv=<value optimized out>) at rbd.cc:2771