https://bugzilla.kernel.org/show_bug.cgi?id=97641 Bug ID: 97641 Summary: Repeated unit attentions trigger initiator lockup Product: IO/Storage Version: 2.5 Kernel Version: 4.1-rc1 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: SCSI Assignee: linux-scsi@xxxxxxxxxxxxxxx Reporter: bvanassche@xxxxxxx Regression: No Created attachment 175651 --> https://bugzilla.kernel.org/attachment.cgi?id=175651&action=edit initiator-deadlock.txt Two virtual machines were configured such that one had the role of iSCSI target system and the other of iSCSI initiator system. After iSCSI login a fio job was started on the initiator system against LUN 0 of the target system. When I start run the following test at the target side: # cd /sys/kernel/scst_tgt/targets/iscsi/iqn.2012-06.be.bva\:tgt1/luns/ # while true; do echo del 1 > mgmt; echo add diskf0 1 > mgmt; done that results in the following error messages at the initiator side: iscsid: Can not allocate memory for receive context. kernel: [ 231.226002] connection1:0: detected conn error (1011) and exactly 30 seconds later the initiator system locks up reporting the following (see also the initiator-deadlock.txt attachment): [ INFO: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected ] 4.1.0-rc1-debug+ #2 Not tainted ------------------------------------------------------ swapper/0/0 [HC0[0]:SC1[1]:HE0:SE0] is trying to acquire: (&(&session->frwd_lock)->rlock){+.-...}, at: [<ffffffffc0185f42>] iscsi_eh_cmd_timed_out+0x42/0x330 [libiscsi] and this task is already holding: (&(&q->__queue_lock)->rlock){-.-...}, at: [<ffffffff81328037>] blk_rq_timed_out_timer+0x27/0x130 which would create a new lock dependency: (&(&q->__queue_lock)->rlock){-.-...} -> (&(&session->frwd_lock)->rlock){+.-...} -- You are receiving this mail because: You are the assignee for the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
