From ac983517ec5941da0c58cacdbad10a231dc4e001 Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Wed, 7 May 2014 08:05:50 +1000 Subject: [PATCH] xfs: don't sleep in xlog_cil_force_lsn on shutdown Reports of a shutdown hang when fsyncing a directory have surfaced, such as this: [ 3663.394472] Call Trace: [ 3663.397199] [] schedule+0x29/0x70 [ 3663.402743] [] xlog_cil_force_lsn+0x185/0x1a0 [xfs] [ 3663.416249] [] _xfs_log_force_lsn+0x6f/0x2f0 [xfs] [ 3663.429271] [] xfs_dir_fsync+0x7d/0xe0 [xfs] [ 3663.435873] [] do_fsync+0x65/0xa0 [ 3663.441408] [] SyS_fsync+0x10/0x20 [ 3663.447043] [] system_call_fastpath+0x16/0x1b If we trigger a shutdown in xlog_cil_push() from xlog_write(), we will never wake waiters on the current push sequence number, so anything waiting in xlog_cil_force_lsn() for that push sequence number to come up will not get woken and hence stall the shutdown. Fix this by ensuring we call wake_up_all(&cil->xc_commit_wait) in the push abort handling, in the log shutdown code when waking all waiters, and adding a shutdown check in the sequence completion wait loops to ensure they abort when a wakeup due to a shutdown occurs. Reported-by: Boris Ranto Reported-by: Eric Sandeen Signed-off-by: Dave Chinner Reviewed-by: Brian Foster Signed-off-by: Dave Chinner --- Reading git-format-patch failed