git-bisect start
# 2.6.25-rc4, bad:
# bad: [84c6f6046c5a2189160a8f0dca8b90427bf690ea] x86_64: make ptrace always sign-extend orig_ax to 64 bits
git-bisect bad 84c6f6046c5a2189160a8f0dca8b90427bf690ea
# 2.6.24, good:
# good: [49914084e797530d9baaf51df9eda77babc98fa8] Linux 2.6.24
git-bisect good 49914084e797530d9baaf51df9eda77babc98fa8
# 2.6.24, hard lockup during boot, nevertheless marking good:
# good: [bd45ac0c5daae35e7c71138172e63df5cf644cf6] Merge branch 'linux-2.6'
git-bisect good bd45ac0c5daae35e7c71138172e63df5cf644cf6
# will lockup as soon as dm-crypt is accessed:
# bad: [f0f1b3364ae7f48084bdf2837fb979ff59622523] Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6
git-bisect bad f0f1b3364ae7f48084bdf2837fb979ff59622523