Hey, while working on some changes in the cxgb4 qp_drain functionality, I encountered this stall. To reproduce it, I attach 2 ram disks via iser over cxgb4 and run an fio test. While the test is running, I tear down the target stack with 'targetcli clearconfig true' While this could be something with my qp_drain logic, I don't see that in these stuck threads. Has anybody seen this? Thanks Steve. --- [ 1107.205467] INFO: task iscsi_trx:9901 blocked for more than 120 seconds. [ 1107.221177] Tainted: G W 4.15.0-rc1-drain-flush-fix+ #8 [ 1107.237174] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1107.254109] iscsi_trx D 0 9901 2 0x80000084 [ 1107.268775] Call Trace: [ 1107.280341] ? __schedule+0x28d/0x870 [ 1107.293129] schedule+0x32/0x80 [ 1107.305381] schedule_timeout+0x1d4/0x2f0 [ 1107.318529] ? ib_sg_to_pages+0x1a0/0x1a0 [ib_core] [ 1107.332554] wait_for_completion+0x123/0x190 [ 1107.345965] ? wake_up_q+0x70/0x70 [ 1107.358526] target_wait_for_sess_cmds+0x41/0x180 [target_core_mod] [ 1107.373826] isert_wait_conn+0x1bd/0x320 [ib_isert] [ 1107.387559] iscsit_close_connection+0x155/0x8e0 [iscsi_target_mod] [ 1107.402604] ? wait_for_completion_interruptible+0x16f/0x1c0 [ 1107.416966] ? wake_up_q+0x70/0x70 [ 1107.428926] iscsit_take_action_for_connection_exit+0x7e/0x100 [iscsi_target_mod] [ 1107.445049] iscsi_target_rx_thread+0xdc/0xf0 [iscsi_target_mod] [ 1107.459636] kthread+0xf5/0x130 [ 1107.471236] ? iscsi_target_tx_thread+0x1f0/0x1f0 [iscsi_target_mod] [ 1107.486060] ? kthread_associate_blkcg+0x90/0x90 [ 1107.499068] ret_from_fork+0x1f/0x30 [ 1107.510902] INFO: task targetcli:9913 blocked for more than 120 seconds. [ 1107.525915] Tainted: G W 4.15.0-rc1-drain-flush-fix+ #8 [ 1107.541170] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1107.557317] targetcli D 0 9913 9750 0x00000080 [ 1107.571126] Call Trace: [ 1107.581750] ? __schedule+0x28d/0x870 [ 1107.593499] schedule+0x32/0x80 [ 1107.604578] schedule_timeout+0x1d4/0x2f0 [ 1107.616433] ? signal_wake_up_state+0x15/0x30 [ 1107.628515] wait_for_completion+0x123/0x190 [ 1107.640367] ? wake_up_q+0x70/0x70 [ 1107.651248] iscsit_cause_connection_reinstatement+0x95/0xe0 [iscsi_target_mod] [ 1107.666102] iscsit_free_session+0x100/0x160 [iscsi_target_mod] [ 1107.679489] iscsit_release_sessions_for_tpg+0x18b/0x200 [iscsi_target_mod] [ 1107.693909] iscsit_tpg_disable_portal_group+0xc1/0x1c0 [iscsi_target_mod] [ 1107.708180] lio_target_tpg_enable_store+0x65/0xe0 [iscsi_target_mod] [ 1107.721984] configfs_write_file+0xa3/0x100 [ 1107.733431] __vfs_write+0x33/0x170 [ 1107.744056] ? handle_mm_fault+0xc4/0x1d0 [ 1107.755084] ? _cond_resched+0x15/0x30 [ 1107.765748] vfs_write+0xad/0x1a0 [ 1107.775832] SyS_write+0x52/0xc0 [ 1107.785683] do_syscall_64+0x61/0x1a0 [ 1107.795865] entry_SYSCALL64_slow_path+0x25/0x25 [ 1107.806931] RIP: 0033:0x7f967db18c60 [ 1107.816850] RSP: 002b:00007ffdce1705e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 1107.830847] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f967db18c60 [ 1107.844408] RDX: 0000000000000001 RSI: 00007f967ec76000 RDI: 0000000000000003 [ 1107.857898] RBP: 00007f967ec76000 R08: 0000000001e0abb0 R09: 00007f967ecfa740 [ 1107.871311] R10: 00007f967eae05f0 R11: 0000000000000246 R12: 0000000001e0aad0 [ 1107.884703] R13: 0000000000000001 R14: 00000000018440a0 R15: 00007f967eaaaf00 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
