Nicholas, Mike, On 7/7/17 15:05, Nicholas A. Bellinger wrote: > Everything including MNC's #1-6 and your #1-2 be pushed to > target-pending/for-next shortly. > > Please use this as your base for testing. :) I ran tests this morning with the latest target-pending/for-next branch. I ran libzbc test suite on top of 4 different configurations: 1) ZBC drive + pscsi + loopback -> OK, no problems. 2) ZBC drive + pscsi + iscsi -> OK, no problems. 3) ZBC emulation tcmu-runner handler + loopback -> OK, no problems. 4) ZBC emulation tcmu-runner handler + iscsi -> Crash ! Here is the oops for case (4): [ 169.545459] scsi host7: iSCSI Initiator over TCP/IP [ 169.559013] scsi 7:0:0:0: Direct-Access-ZBC LIO-ORG TCMU ZBC device 0002 PQ: 0 ANSI: 5 [ 169.576920] sd 7:0:0:0: Attached scsi generic sg9 type 20 [ 169.577209] sd 7:0:0:0: [sdi] Host-managed zoned block device [ 169.577794] sd 7:0:0:0: [sdi] 20971520 512-byte logical blocks: (10.7 GB/10.0 GiB) [ 169.577796] sd 7:0:0:0: [sdi] 40 zones of 524288 logical blocks [ 169.577980] sd 7:0:0:0: [sdi] Write Protect is off [ 169.578329] sd 7:0:0:0: [sdi] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 169.590379] sd 7:0:0:0: [sdi] Attached SCSI disk [ 240.071464] BUG: unable to handle kernel paging request at ffffc9065db85540 [ 240.078460] IP: memcpy_erms+0x6/0x10 [ 240.082044] PGD 7ff0ba067 [ 240.082045] P4D 7ff0ba067 [ 240.084766] PUD 0 [ 240.087486] [ 240.091006] Oops: 0002 [#1] PREEMPT SMP [ 240.094855] Modules linked in: ip6table_filter ip6_tables rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi sunrpc snd_hda_codec_hdmi snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core snd_seq snd_seq_device x86_pkg_temp_thermal coretemp snd_pcm crc32_pclmul snd_timer iTCO_wdt snd i2c_i801 iTCO_vendor_support soundcore i915 iosf_mbi i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm e1000e r8169 mpt3sas mii i2c_core raid_class video [ 240.143969] CPU: 0 PID: 1285 Comm: iscsi_trx Not tainted 4.12.0-rc1+ #3 [ 240.150607] Hardware name: ASUS All Series/H87-PRO, BIOS 2104 10/28/2014 [ 240.157331] task: ffff8807de4f5800 task.stack: ffffc900047dc000 [ 240.163270] RIP: 0010:memcpy_erms+0x6/0x10 [ 240.167377] RSP: 0018:ffffc900047dfc68 EFLAGS: 00010202 [ 240.172621] RAX: ffffc9065db85540 RBX: ffff8807f7980000 RCX: 0000000000000010 [ 240.179771] RDX: 0000000000000010 RSI: ffff8807de574fe0 RDI: ffffc9065db85540 [ 240.186930] RBP: ffffc900047dfd30 R08: ffff8807de41b000 R09: 0000000000000000 [ 240.194088] R10: 0000000000000040 R11: ffff8807e9b726f0 R12: 00000006565726b0 [ 240.201246] R13: ffffc90007612ea0 R14: 000000065657d540 R15: 0000000000000000 [ 240.208397] FS: 0000000000000000(0000) GS:ffff88081fa00000(0000) knlGS:0000000000000000 [ 240.216510] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 240.222280] CR2: ffffc9065db85540 CR3: 0000000001c0f000 CR4: 00000000001406f0 [ 240.229430] Call Trace: [ 240.231887] ? tcmu_queue_cmd+0x83c/0xa80 [ 240.235916] ? target_check_reservation+0xcd/0x6f0 [ 240.240725] __target_execute_cmd+0x27/0xa0 [ 240.244918] target_execute_cmd+0x232/0x2c0 [ 240.249124] ? __local_bh_enable_ip+0x64/0xa0 [ 240.253499] iscsit_execute_cmd+0x20d/0x270 [ 240.257693] iscsit_sequence_cmd+0x110/0x190 [ 240.261985] iscsit_get_rx_pdu+0x360/0xc80 [ 240.267565] ? iscsi_target_rx_thread+0x54/0xd0 [ 240.273571] iscsi_target_rx_thread+0x9a/0xd0 [ 240.279413] kthread+0x113/0x150 [ 240.284120] ? iscsi_target_tx_thread+0x1e0/0x1e0 [ 240.290297] ? kthread_create_on_node+0x40/0x40 [ 240.296297] ret_from_fork+0x2e/0x40 [ 240.301332] Code: 90 90 90 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 <f3> a4 c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 [ 240.321751] RIP: memcpy_erms+0x6/0x10 RSP: ffffc900047dfc68 [ 240.328838] CR2: ffffc9065db85540 [ 240.333667] ---[ end trace b7e5354cfb54d08b ]--- I went back to running my initial 5 patch series on top of the current 4.12 kernel and everything is fine, including case (4). A diff of the 2 versions of drivers/target/target_core_user.c did not reveal anything obvious that could result in this... It does look like a race condition on the session command or some memory corruption/bad pointer. Any idea ? Thanks you. Best regards. -- Damien Le Moal, Western Digital
