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Created attachment 1104616[details]
reproducer 2 (C source example)
1. unpack
2. run "make"
3. run "./a.out"
4. run "make gcov"
# make
gcc -O2 -fprofile-arcs -ftest-coverage test1.c
# ./a.out
# make gcov
gcov -b -c -d -a test1.gcda
Processing file 1 out of 1
Description of problem: gcov performance is really bad when processing kernel file "xfs_sb.c", specifically this construct takes days to process when running with --all-blocks: xfs_mount_validate_sb@fs/xfs/libxfs/xfs_sb.c: ... if (unlikely( sbp->sb_agcount <= 0 || sbp->sb_sectsize < XFS_MIN_SECTORSIZE || sbp->sb_sectsize > XFS_MAX_SECTORSIZE || sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || sbp->sb_sectsize != (1 << sbp->sb_sectlog) || sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || sbp->sb_blocksize != (1 << sbp->sb_blocklog) || sbp->sb_dirblklog > XFS_MAX_BLOCKSIZE_LOG || sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || sbp->sb_inodelog < XFS_DINODE_MIN_LOG || sbp->sb_inodelog > XFS_DINODE_MAX_LOG || sbp->sb_inodesize != (1 << sbp->sb_inodelog) || sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE || sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) || (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) || sbp->sb_dblocks == 0 || sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) || sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp) || sbp->sb_shared_vn != 0)) { xfs_notice(mp, "SB sanity check failed"); return -EFSCORRUPTED; } Version-Release number of selected component (if applicable): gcc-4.8.5-4.el7.x86_64 How reproducible: 100% Steps to Reproduce: run gcov on gcov enabled kernel in fs/xfs with --all-blocks -or- run attached reproducer Actual results: it takes days for gcov to complete Expected results: gcov should complete in more reasonable time (minutes) Additional info: [GCC] Bug 67992 - GCOV takes an absurdly long time to process a file https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67992