Messages in this thread |  | | Subject | [RFC] probably bug in current ext3/jbd | From | Alex Tomas <> | Date | Sun, 18 May 2003 17:21:08 +0000 |
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hi!
ext3/jbd use b_committed_data buffer in order to prevent allocation of blocks which were freed in non-committed transaction. I think there is bug in this code. look,
some thread commit thread ---------------------------------------------------------- get_undo_access(#1) dirty_buffer(#1) stop_journal()
start commit
start_journal() get_undo_access(#1): 1) wait for #1 to be in t_forget_list
write #1 to log put #1 onto t_forget_list
2) b_commit_data exists, finish get_undo_access()
for_each_bh_in_forget_list() { if (jh->b_committed_data) { kfree(jh->b_committed_data); jh->b_committed_data = NULL; } }
/* using of b_committed_data */
b_committed_data is NULL ?
with best regards, Alex
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