https://bugzilla.kernel.org/show_bug.cgi?id=29162 Hamdi Hamdi <hhamdi@xxxxxxxxxx> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |hhamdi@xxxxxxxxxx --- Comment #66 from Hamdi Hamdi <hhamdi@xxxxxxxxxx> --- Hi, After some research there is a scenario which triggered my suspicion (ref http://lxr.free-electrons.com/source/fs/reiserfs/journal.c?v=3.3): 1) several threads call `queue_log_writer` and are put to sleep 2) J_WRITERS_QUEUED bit is set 3) `check_journal_end` returns nonzero value and the `do_journal_end` continues it's execution 4) at line 4252 it clears the bit and wakes 1 thread 5) no other thread enters `queue_log_writer` due to some unknown reason and the bit is not set again 5) the awaken thread ends up with `if (!check_journal_end(th, sb, nblocks, flags)` returning 0 which triggers the awakening of another thread 6) No one will be awaken since there is no bit set on `if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))`, except when the execution reaches line 4253 One ugly workaround for testing purposes at line 4253: 4253 wake_up(&(journal->j_join_wait)); replaced with 4253 wake_up_all(&(journal->j_join_wait)); There must be a reason for this to happen on high loads only so any help and/or suggestions is more that welcome ! -- You are receiving this mail because: You are the assignee for the bug. -- To unsubscribe from this list: send the line "unsubscribe reiserfs-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
