From: Neil Horman Date: Mon, 23 Jun 2014 14:40:25 +0000 (-0400) Subject: fc: ensure scan_work isn't active when freeing fc_rport X-Git-Tag: firefly_0821_release~176^2~3657^2^2~7 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0353e085edb0f11e040cf91e71d831ec07943b20;p=firefly-linux-kernel-4.4.55.git fc: ensure scan_work isn't active when freeing fc_rport debugfs caught this: WARNING: at lib/debugobjects.c:260 debug_print_object+0x83/0xa0() ODEBUG: free active (active state 0) object type: work_struct hint: fc_scsi_scan_rport+0x0/0xd0 [scsi_transport_fc] CPU: 1 PID: 184 Comm: kworker/1:1 Tainted: G W -------------- 3.10.0-123.el7.x86_64.debug #1 Hardware name: HP ProLiant DL120 G7, BIOS J01 07/01/2013 Workqueue: fc_wq_5 fc_rport_final_delete [scsi_transport_fc] Call Trace: [] dump_stack+0x19/0x1b [] warn_slowpath_common+0x61/0x80 [] warn_slowpath_fmt+0x5c/0x80 [] debug_print_object+0x83/0xa0 [] ? fc_parse_wwn+0x100/0x100 [] debug_check_no_obj_freed+0x22b/0x270 [] ? fc_rport_dev_release+0x1e/0x30 [] kfree+0xd9/0x2d0 [] fc_rport_dev_release+0x1e/0x30 [] device_release+0x32/0xa0 [] kobject_release+0x7e/0x1b0 [] kobject_put+0x28/0x60 [] put_device+0x17/0x20 [] fc_rport_final_delete+0x165/0x210 [] process_one_work+0x220/0x710 [] ? process_one_work+0x1b4/0x710 [] worker_thread+0x11b/0x3a0 [] ? process_one_work+0x710/0x710 [] kthread+0xed/0x100 [] ? insert_kthread_work+0x80/0x80 [] ret_from_fork+0x7c/0xb0 [] ? insert_kthread_work+0x80/0x80 Seems to be because the scan_work work_struct might be active when the housing fc_rport struct gets freed. Ensure that we cancel it prior to freeing the rport Signed-off-by: Neil Horman Reviewed-by: Vasu Dev Reviewed-by: Hannes Reinecke Signed-off-by: Christoph Hellwig --- diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c index f80908f74ca9..521f5838594b 100644 --- a/drivers/scsi/scsi_transport_fc.c +++ b/drivers/scsi/scsi_transport_fc.c @@ -2549,6 +2549,7 @@ fc_rport_final_delete(struct work_struct *work) fc_flush_devloss(shost); if (!cancel_delayed_work(&rport->dev_loss_work)) fc_flush_devloss(shost); + cancel_work_sync(&rport->scan_work); spin_lock_irqsave(shost->host_lock, flags); rport->flags &= ~FC_RPORT_DEVLOSS_PENDING; }