git: hammer - Avoid panic in particular corruption situations

Matthew Dillon dillon at
Sun May 10 19:54:34 PDT 2015

commit b961cdbbbbbccb4f672f697f45bfdd5befcaf3f6
Author: Matthew Dillon <dillon at>
Date:   Sun May 10 19:51:18 2015 -0700

    hammer - Avoid panic in particular corruption situations
    This commit fixes two panics which can arise from attempting to access a
    corrupted filesystem.  It does not fix the issue that led to the corruption
    in the first place (which we believe might have been GPU-related random
    memory corruption on a particular machine).  It allows the filesystem to
    continue to operate so it can be spooled off and reformatted.
    * Do not panic on a NULL pointer dereference if a cursor iteration
      fails due to corruption.
    * Do not panic during a flush on a sequence space error if the filesystem
      has been forced into read-only mode (which prevents older sequence spaces
      from being flushed).
    Reported-by: Sephe

Summary of changes:
 sys/vfs/hammer/hammer_btree.c   | 9 +++++++++
 sys/vfs/hammer/hammer_flusher.c | 7 ++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

DragonFly BSD source repository

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