Hi all, Now we are testing ocfs2 with 4.14 kernel, and we finding a deadlock with umount and ocfs2 workqueue triggered by ocfs2rec thread. The stack as follows: journal recovery work: [<ffffffff8a8c0694>] call_rwsem_down_read_failed+0x14/0x30 [<ffffffffc0d5d652>] ocfs2_finish_quota_recovery+0x62/0x450 [ocfs2] [<ffffffffc0d21221>] ocfs2_complete_recovery+0xc1/0x440 [ocfs2] [<ffffffff8a09a1f0>] process_one_work+0x130/0x350 [<ffffffff8a09a946>] worker_thread+0x46/0x3b0 [<ffffffff8a0a0e51>] kthread+0x101/0x140 [<ffffffff8aa002ff>] ret_from_fork+0x1f/0x30 [<ffffffffffffffff>] 0xffffffffffffffff
/bin/umount: [<ffffffff8a099b24>] flush_workqueue+0x104/0x3e0 [<ffffffffc0cf18db>] ocfs2_truncate_log_shutdown+0x3b/0xc0 [ocfs2] [<ffffffffc0d4fd6c>] ocfs2_dismount_volume+0x8c/0x3d0 [ocfs2] [<ffffffffc0d500e1>] ocfs2_put_super+0x31/0xa0 [ocfs2] [<ffffffff8a2445bd>] generic_shutdown_super+0x6d/0x120 [<ffffffff8a24469d>] kill_block_super+0x2d/0x60 [<ffffffff8a244e71>] deactivate_locked_super+0x51/0x90 [<ffffffff8a263a1b>] cleanup_mnt+0x3b/0x70 [<ffffffff8a09e9c6>] task_work_run+0x86/0xa0 [<ffffffff8a003d70>] exit_to_usermode_loop+0x6d/0xa9 [<ffffffff8a003a2d>] do_syscall_64+0x11d/0x130 [<ffffffff8aa00113>] entry_SYSCALL64_slow_path+0x25/0x25 [<ffffffffffffffff>] 0xffffffffffffffff Function ocfs2_finish_quota_recovery try to get sb->s_umount, which was already locked by umount thread, then get a deadlock. This issue was introduced by c3b004460d77bf3f980d877be539016f2df4df12 and 5f530de63cfc6ca8571cbdf58af63fb166cc6517. I think we cannot use :: s_umount, but the mutex ::dqonoff_mutex was already removed. Shall we add a new mutex? Thanks Changkuo ------------------------------------------------------------------------------------------------------------------------------------- 本邮件及其附件含有新华三技术有限公司的保密信息,仅限于发送给上面地址中列出 的个人或群组。禁止任何其他人以任何形式使用(包括但不限于全部或部分地泄露、复制、 或散发)本邮件中的信息。如果您错收了本邮件,请您立即电话或邮件通知发件人并删除本 邮件! This e-mail and its attachments contain confidential information from New H3C, which is intended only for the person or entity whose address is listed above. Any use of the information contained herein in any way (including, but not limited to, total or partial disclosure, reproduction, or dissemination) by persons other than the intended recipient(s) is prohibited. If you receive this e-mail in error, please notify the sender by phone or email immediately and delete it! _______________________________________________ Ocfs2-devel mailing list Ocfs2-devel@oss.oracle.com https://oss.oracle.com/mailman/listinfo/ocfs2-devel