ext4: fix panic on module unload when stopping lazyinit thread
https://bugzilla.kernel.org/show_bug.cgi?id=27652 If the lazyinit thread is running, the teardown function ext4_destroy_lazyinit_thread() has problems: ext4_clear_request_list(); while (ext4_li_info->li_task) { wake_up(&ext4_li_info->li_wait_daemon); wait_event(ext4_li_info->li_wait_task, ext4_li_info->li_task == NULL); } Clearing the request list will cause the thread to exit and free ext4_li_info, so then we're waiting on something which is getting freed. Fix this up by making the thread respond to kthread_stop, and exit, without the need to wait for that exit in some other homegrown way. Cc: stable@kernel.org Reported-and-Tested-by: NTao Ma <boyu.mt@taobao.com> Signed-off-by: NEric Sandeen <sandeen@redhat.com> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
Showing
想要评论请 注册 或 登录