Hi Jun, On Tue, 2014-04-15 at 09:15 -0700, Jun Wu wrote: > Hello, > > We are working on a cluster file system using fcoe vn2vn. Multiple > initiators can see the same set of target hard drives exported by > targetcli tcm_fc. When the initiators run IO to these target hard > drives at the same time, target system crashes no matter using iblock > backstore or pscsi backstore. See the following dump. > > crash> bt > PID: 318 TASK: ffff880c1a05aee0 CPU: 5 COMMAND: "kworker/5:1" > #0 [ffff880c1a895a48] machine_kexec at ffffffff810485e2 > #1 [ffff880c1a895a98] crash_kexec at ffffffff810d09d3 > #2 [ffff880c1a895b60] oops_end at ffffffff816f0c98 > #3 [ffff880c1a895b88] die at ffffffff8101616b > #4 [ffff880c1a895bb8] do_trap at ffffffff816f04b0 > #5 [ffff880c1a895c08] do_invalid_op at ffffffff810134a8 > #6 [ffff880c1a895cb0] invalid_op at ffffffff816f9c1e > [exception RIP: ft_queue_data_in+1386] > RIP: ffffffffa0641eda RSP: ffff880c1a895d68 RFLAGS: 00010246 > RAX: 0000000000001000 RBX: ffff880c17a6dc10 RCX: 0000000000000002 > RDX: 0000000000000000 RSI: ffff880c1afa36d8 RDI: 0000000000000000 > RBP: ffff880c1a895df8 R8: ffff880c1667e45c R9: dfcf2970a166dd90 > R10: dfcf2970a166dd90 R11: 0000000000000000 R12: ffff880c17a6dc10 > R13: ffff880c3fc33e00 R14: 0000000000001000 R15: 0000000000000140 > ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 > #7 [ffff880c1a895d60] ft_queue_data_in at ffffffffa06419c7 [tcm_fc] > #8 [ffff880c1a895e00] target_complete_ok_work at ffffffffa04ded21 > [target_core_ > > mod] > #9 [ffff880c1a895e28] process_one_work at ffffffff8107d0ec > #10 [ffff880c1a895e70] worker_thread at ffffffff8107dd3c > #11 [ffff880c1a895ed0] kthread at ffffffff810848d0 > #12 [ffff880c1a895f50] ret_from_fork at ffffffff816f836c > > Is there any way to avoid this problem? Can you be a bit more specific on the setup..? Eg: kernel version on the target, NICs, backstores, etcs. Also, it might be useful if you can run the RIP (ft_queue_data_in+1386) through gdb with your kernel source to see where the bug is actually pointing. (Also, CC'ing some of the Intel FCoE folks) --nab -- To unsubscribe from this list: send the line "unsubscribe target-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
