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authorChangwei Ge <ge.changwei@h3c.com>2018-11-02 15:48:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-11-03 10:09:37 -0700
commit9e985787750db8aae87f02b67e908f28ac4d6b83 (patch)
treeb7693d418aa7201f4bc290774c5b8540350356c9 /fs/affs/dir.c
parent21158ca85b73ddd0088076a5209cfd040513a8b5 (diff)
downloadlinux-9e985787750db8aae87f02b67e908f28ac4d6b83.tar.bz2
ocfs2: don't use iocb when EIOCBQUEUED returns
When -EIOCBQUEUED returns, it means that aio_complete() will be called from dio_complete(), which is an asynchronous progress against write_iter. Generally, IO is a very slow progress than executing instruction, but we still can't take the risk to access a freed iocb. And we do face a BUG crash issue. Using the crash tool, iocb is obviously freed already. crash> struct -x kiocb ffff881a350f5900 struct kiocb { ki_filp = 0xffff881a350f5a80, ki_pos = 0x0, ki_complete = 0x0, private = 0x0, ki_flags = 0x0 } And the backtrace shows: ocfs2_file_write_iter+0xcaa/0xd00 [ocfs2] aio_run_iocb+0x229/0x2f0 do_io_submit+0x291/0x540 SyS_io_submit+0x10/0x20 system_call_fastpath+0x16/0x75 Link: http://lkml.kernel.org/r/1523361653-14439-1-git-send-email-ge.changwei@h3c.com Signed-off-by: Changwei Ge <ge.changwei@h3c.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Mark Fasheh <mark@fasheh.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Joseph Qi <jiangqi903@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/affs/dir.c')
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