Hi Feng, As per my previous comment: >> Thanks for the patch Feng, I have tested this patch and below panic has also disappeared. patch applied successfully and the panic has disappeared, so your fix works. Regards, Sumit Rai > On Jul 18, 2016, at 7:49 AM, Feng Li <lifeng1519@xxxxxxxxx> wrote: > > Hi Sumit, > > I have tested and the oops is disappeared. > > Could you double check if you have patched successfully? > This stack is still the same. > > The place is 0x00000000000001f8. > > gdb> p (int)&((struct iscsi_session*)0)->se_sess > $3 = 0x1f8 > > 2016-07-14 17:59 GMT+08:00 Sumit Rai <sumit.rai@xxxxxxxxxxxxxx>: >> Thanks for the patch Feng, I have tested this patch and below panic has also disappeared. >> (initially reported at http://article.gmane.org/gmane.linux.scsi.target.devel/12735). >> >> dmesg >> ===== >> [ 862.784477] BUG: unable to handle kernel NULL pointer dereference at 00000000000001f8 >> [ 862.784486] IP: [<ffffffffc0604b44>] iscsi_target_login_thread+0x724/0xfa0 [iscsi_target_mod] >> [ 862.784570] PGD 0 >> [ 862.784572] Oops: 0000 [#1] SMP >> [ 862.784575] Modules linked in: target_core_user uio tcm_fc libfc ib_srpt tcm_usb_gadget >> libcomposite udc_core tcm_loop vhost_scsi vhost iscsi_target_mod tcm_qla2xxx qla2xxx >> scsi_transport_fc target_core_file target_core_iblock target_core_pscsi target_core_mod >> configfs pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) >> vmw_vsock_vmci_transport vsock vmhgfs(OE) coretemp kvm_intel kvm binfmt_misc irqbypass >> crct10dif_pclmul crc32_pclmul aesni_intel vmw_balloon aes_x86_64 lrw gf128mul glue_helper >> ablk_helper cryptd joydev input_leds serio_raw i2c_piix4 vmw_vmci shpchp 8250_fintek mac_hid >> ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi >> scsi_transport_iscsi parport_pc ppdev lp parport autofs4 hid_generic usbhid hid vmwgfx ttm psmouse >> drm_kms_helper syscopyarea >> [ 862.784609] sysfillrect sysimgblt mptspi mptscsih fb_sys_fops drm ahci libahci e1000 mptbase >> scsi_transport_spi pata_acpi floppy fjes >> [ 862.784618] CPU: 0 PID: 9241 Comm: iscsi_np Tainted: G OE 4.4.0-24-generic #43-Ubuntu >> [ 862.784620] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, >> BIOS 6.00 05/20/2014 >> [ 862.784622] task: ffff8800759d1b80 ti: ffff880075a00000 task.ti: ffff880075a00000 >> [ 862.784624] RIP: 0010:[<ffffffffc0604b44>] [<ffffffffc0604b44>] >> iscsi_target_login_thread+0x724/0xfa0 [iscsi_target_mod] >> [ 862.784632] RSP: 0018:ffff880075a03e40 EFLAGS: 00010246 >> [ 862.784633] RAX: 0000000000000000 RBX: ffff880075a52800 RCX: 0000000000037726 >> [ 862.784635] RDX: 0000000000037725 RSI: ffff88007b619fe0 RDI: ffff880033bce800 >> [ 862.784636] RBP: ffff880075a03ec0 R08: 0000000000019fe0 R09: ffffffffc06067c6 >> [ 862.784637] R10: ffffea0001d1d880 R11: 654d687475410032 R12: ffff880074763140 >> [ 862.784638] R13: ffff880075a52820 R14: ffff880075a528d8 R15: ffff880033bce800 >> [ 862.784640] FS: 0000000000000000(0000) GS:ffff88007b600000(0000) knlGS:0000000000000000 >> [ 862.784641] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b >> [ 862.784642] CR2: 00000000000001f8 CR3: 0000000072f8e000 CR4: 00000000000406f0 >> [ 862.784716] Stack: >> [ 862.784719] ffff880075e87080 ffff88003526f358 ffff8800799cc420 ffff880000000000 >> [ 862.784721] ffff880079cd0100 ffff880075a52828 00ff88003526ee00 ffff880075a528d8 >> [ 862.784723] ffff8800759d1b80 ffff880075a52800 0000000058f0fa77 ffff880075a0aac0 >> [ 862.784725] Call Trace: >> [ 862.784736] [<ffffffffc0604420>] ? iscsi_target_login_sess_out+0x240/0x240 [iscsi_target_mod] >> [ 862.784782] [<ffffffff810a06a8>] kthread+0xd8/0xf0 >> [ 862.784786] [<ffffffff810a05d0>] ? kthread_create_on_node+0x1e0/0x1e0 >> [ 862.784789] [<ffffffff81825f8f>] ret_from_fork+0x3f/0x70 >> [ 862.784791] [<ffffffff810a05d0>] ? kthread_create_on_node+0x1e0/0x1e0 >> [ 862.784792] Code: 00 00 4c 89 e2 4c 89 fe 48 89 df e8 c7 19 00 00 85 c0 0f 88 32 01 00 00 0f b6 45 b7 4c 89 ff 41 88 44 24 09 >> 49 8b 87 48 05 00 00 <4c> 8b b0 f8 01 00 00 49 8b 87 10 05 00 00 ff 90 98 00 00 00 41 >> [ 862.784811] RIP [<ffffffffc0604b44>] iscsi_target_login_thread+0x724/0xfa0 [iscsi_target_mod] >> [ 862.784819] RSP <ffff880075a03e40> >> [ 862.784820] CR2: 00000000000001f8 >> [ 862.784823] ---[ end trace 7e41630f165c8027 ]--- >> >> Regards, >> Sumit Rai >>> On Jul 12, 2016, at 8:46 AM, Feng Li <lifeng1519@xxxxxxxxx> wrote: >>> >>> Add lszhu@xxxxxxxx >>> >>> 2016-07-11 22:23 GMT+08:00 冯力 <lifeng1519@xxxxxxxxx>: >>>> This problem exists at least from v3.16. >>>> The upstream kernel still exists this issue. >>>> >>>> I have tested my patch and the following panic is disappeared. >>>> >>>> Thanks, >>>> - Alex >>>> >>>> #dmesg >>>> >>>> [ 1160.788676] sd 16:0:0:0: [sde] Attached SCSI disk >>>> [ 1383.962626] target_core_get_fabric() failed for usb_gadget >>>> [ 1404.788910] TARGET_CORE[iSCSI]: Unsupported SCSI Opcode 0x1b, >>>> sending CHECK_CONDITION. >>>> [ 1404.858451] BUG: unable to handle kernel NULL pointer dereference >>>> at 00000000000001f8 >>>> [ 1404.858911] IP: [<ffffffffa05ee5d8>] >>>> iscsi_target_login_thread+0x728/0x10b0 [iscsi_target_mod] >>>> [ 1404.859746] PGD 230c29067 PUD 232060067 PMD 0 >>>> [ 1404.859963] Oops: 0000 [#1] SMP >>>> [ 1404.860154] Modules linked in: crc32c_generic tcm_loop tcm_qla2xxx >>>> qla2xxx iscsi_target_mod ib_srpt vhost_scsi vhost tcm_fc libfc >>>> scsi_transport_fc scsi_tgt target_core_file target_core_iblock >>>> target_core_pscsi target_core_mod configfs nbd >>>> vmw_vsock_vmci_transport vsock bridge stp llc vmhgfs(O) snd_ens1371 >>>> snd_rawmidi snd_seq_device snd_ac97_codec snd_pcm snd_timer snd >>>> vmw_balloon evdev soundcore ac97_bus gameport ppdev pcspkr sg psmouse >>>> serio_raw parport_pc vmwgfx parport battery ttm drm_kms_helper drm >>>> i2c_piix4 shpchp i2c_core vmw_vmci processor thermal_sys ac button >>>> binfmt_misc md_mod ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core >>>> ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi >>>> hid_generic usbhid hid ext4 crc16 mbcache jbd2 sd_mod crc_t10dif >>>> crct10dif_generic crct10dif_common ata_generic >>>> [ 1404.861278] mptspi scsi_transport_spi mptscsih ata_piix uhci_hcd >>>> ehci_pci ehci_hcd mptbase libata usbcore e1000 usb_common scsi_mod >>>> sunrpc dm_mirror dm_region_hash dm_log dm_mod autofs4 >>>> [ 1404.861742] CPU: 2 PID: 1865 Comm: iscsi_np Tainted: G O >>>> 3.16.0-4-amd64 #1 Debian 3.16.7-ckt25-1 >>>> [ 1404.861868] Hardware name: VMware, Inc. VMware Virtual >>>> Platform/440BX Desktop Reference Platform, BIOS 6.00 07/02/2015 >>>> [ 1404.862033] task: ffff880234c849a0 ti: ffff8800b9c20000 task.ti: >>>> ffff8800b9c20000 >>>> [ 1404.862114] RIP: 0010:[<ffffffffa05ee5d8>] [<ffffffffa05ee5d8>] >>>> iscsi_target_login_thread+0x728/0x10b0 [iscsi_target_mod] >>>> [ 1404.862233] RSP: 0018:ffff8800b9c23e60 EFLAGS: 00010246 >>>> [ 1404.862282] RAX: 0000000000000000 RBX: ffff88023125b800 RCX: ffff8802b4d8d000 >>>> [ 1404.862344] RDX: 000000000000002d RSI: 00000000fffffe01 RDI: ffff880233ef1800 >>>> [ 1404.862406] RBP: ffff8800b9651a00 R08: 00000000d5a073de R09: ffff88023487e6c0 >>>> [ 1404.862585] R10: 00000000ead0c2e5 R11: 00000000d039ef6a R12: ffff88023125b854 >>>> [ 1404.865580] R13: ffff88023125b908 R14: ffff880233ef1800 R15: ffff880234c849a0 >>>> [ 1404.867732] FS: 00007fba67e2fb80(0000) GS:ffff88023e640000(0000) >>>> knlGS:0000000000000000 >>>> [ 1404.869772] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b >>>> [ 1404.871850] CR2: 00000000000001f8 CR3: 0000000230ffa000 CR4: 00000000000007e0 >>>> [ 1404.874271] Stack: >>>> [ 1404.877492] ffff88023125b908 00ff880234c849a0 ffff88023125b858 >>>> ffff88023481f400 >>>> [ 1404.880162] ffffffff81510d00 ffff880230768000 ffff8800b9c23fd8 >>>> 0000000000012f00 >>>> [ 1404.883545] ffff880234c849a0 ffff880233e9da40 ffff88023125b800 >>>> ffffffffa05edeb0 >>>> [ 1404.885865] Call Trace: >>>> [ 1404.888384] [<ffffffff81510d00>] ? __schedule+0x250/0x700 >>>> [ 1404.890619] [<ffffffffa05edeb0>] ? >>>> iscsi_target_login_sess_out+0x240/0x240 [iscsi_target_mod] >>>> [ 1404.892668] [<ffffffff8108809d>] ? kthread+0xbd/0xe0 >>>> [ 1404.894646] [<ffffffff81087fe0>] ? kthread_create_on_node+0x180/0x180 >>>> [ 1404.896553] [<ffffffff81514958>] ? ret_from_fork+0x58/0x90 >>>> [ 1404.898556] [<ffffffff81087fe0>] ? kthread_create_on_node+0x180/0x180 >>>> [ 1404.900597] Code: 09 00 00 48 89 ea 4c 89 f6 48 89 df e8 52 1b 00 >>>> 00 85 c0 0f 88 82 02 00 00 0f b6 44 24 0f 4c 89 f7 88 45 09 49 8b 86 >>>> d8 04 00 00 <4c> 8b a8 f8 01 00 00 49 8b 86 a0 04 00 00 ff 90 98 00 00 >>>> 00 41 >>>> [ 1404.906962] RIP [<ffffffffa05ee5d8>] >>>> iscsi_target_login_thread+0x728/0x10b0 [iscsi_target_mod] >>>> [ 1404.908962] RSP <ffff8800b9c23e60> >>>> [ 1404.910940] CR2: 00000000000001f8 >>>> [ 1404.917670] ---[ end trace d29d8c681ab2bdfb ]--- >>>> [ 1419.859690] iSCSI Login timeout on Network Portal 10.182.70.69:3260 >>>> [ 1479.832056] iSCSI Login timeout on Network Portal 10.182.70.68:3260 >>>> [ 1479.835739] iSCSI Login negotiation failed. >>>> [ 1549.332632] iSCSI Login timeout on Network Portal 10.182.70.68:3260 >>>> [ 1549.338432] iSCSI Login negotiation failed. >>>> [ 1564.358423] iSCSI Login timeout on Network Portal 10.182.70.68:3260 >>>> [ 1564.362443] iSCSI Login negotiation failed. >>>> >>>> 2016-07-12 6:15 GMT+08:00 Feng Li <li.feng@xxxxxxxxxx>: >>>>> From: Feng Li <lifeng1519@xxxxxxxxx> >>>>> >>>>> In MC/S scenario, the conn->sess has been set NULL in >>>>> iscsi_login_non_zero_tsih_s1 when the second connection comes here, >>>>> then kernel panic. >>>>> >>>>> The conn->sess will be assigned in iscsi_login_non_zero_tsih_s2. So >>>>> we should check whether it's NULL before calling. >>>>> >>>>> Signed-off-by: Feng Li <lifeng1519@xxxxxxxxx> >>>>> --- >>>>> drivers/target/iscsi/iscsi_target_login.c | 5 +++-- >>>>> 1 file changed, 3 insertions(+), 2 deletions(-) >>>>> >>>>> diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c >>>>> index b5212f0..adf419f 100644 >>>>> --- a/drivers/target/iscsi/iscsi_target_login.c >>>>> +++ b/drivers/target/iscsi/iscsi_target_login.c >>>>> @@ -1371,8 +1371,9 @@ static int __iscsi_target_login_thread(struct iscsi_np *np) >>>>> } >>>>> login->zero_tsih = zero_tsih; >>>>> >>>>> - conn->sess->se_sess->sup_prot_ops = >>>>> - conn->conn_transport->iscsit_get_sup_prot_ops(conn); >>>>> + if (conn->sess) >>>>> + conn->sess->se_sess->sup_prot_ops = >>>>> + conn->conn_transport->iscsit_get_sup_prot_ops(conn); >>>>> >>>>> tpg = conn->tpg; >>>>> if (!tpg) { >>>>> -- >>>>> 2.9.0 >>>>> >>>> >>>> >>>> >>>> -- >>>> Thanks and Best Regards, >>>> Feng Li(Alex) >>> >>> >>> >>> -- >>> Thanks and Best Regards, >>> Feng Li(Alex) >> > > > > -- > Thanks and Best Regards, > Feng Li(Alex) -- 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
