Message-ID: <36c3ffe1c3f74e2ba7f75a86bf7e166a@XCH-ALN-006.cisco.com>
Date:	Mon, 25 Jan 2016 14:43:53 +0000
From:	"Serguei Bezverkhi (sbezverk)" <sbezverk@...co.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: iscsid crash with kernel 4.4

Hello,

I see this traceback every time when a process tries to access iscsi target with kernel 4.4. I was wondering if it is a known issue and if there is a patch for this issue. It is reproducible 100% of cases.

See the traceback below.

Thank you

Serguei

[ 4693.175319] WARNING: CPU: 27 PID: 17353 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x64/0x80()
[ 4693.175320] sysfs: cannot create duplicate filename '/bus/scsi/devices/8:0:0:0'
[ 4693.175321] Modules linked in: target_core_user target_core_pscsi target_core_file target_core_iblock binfmt_misc xt_REDIRECT nf_nat_redirect xt_nat xt_mark xt_conntrack xt_CHECKSUM iptable_raw ebtable_filter ebtables ip6table_filter ip6_tables iscsi_tcp libiscsi_tcp bnx2fc cnic uio fcoe 8021q garp mrp openvswitch nf_defrag_ipv6 bonding rpcrdma ib_isert iscsi_target_mod ib_iser libiscsi scsi_transport_iscsi ib_srpt target_core_mod ib_srp scsi_transport_srp ib_ipoib rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm ib_cm iw_cm ib_sa ib_mad usnic_verbs ib_core ib_addr xt_comment xt_multiport iptable_filter iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul aesni_intel
[ 4693.175362]  lrw gf128mul glue_helper ablk_helper cryptd ipmi_devintf ses enclosure sg ipmi_si 8250_fintek ipmi_msghandler joydev input_leds sb_edac iTCO_wdt iTCO_vendor_support pcspkr shpchp lpc_ich edac_core mfd_core wmi acpi_power_meter nfsd auth_rpcgss nfs_acl lockd grace sunrpc dm_multipath ip_tables xfs libcrc32c sd_mod crc32c_intel mgag200 megaraid_sas drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm libfcoe libfc scsi_transport_fc enic ixgbe(O) i40e vxlan ip6_udp_tunnel igb udp_tunnel ptp pps_core dca i2c_algo_bit fjes dm_mirror dm_region_hash dm_log dm_mod [last unloaded: fnic]
[ 4693.175391] CPU: 27 PID: 17353 Comm: iscsiadm Tainted: G        W  O    4.4.0-1.el7.elrepo.x86_64 #1
[ 4693.175392] Hardware name: Cisco Systems Inc UCSC-C240-M3S/UCSC-C240-M3S, BIOS C240M3.2.0.8.0.071620152208 07/16/2015
[ 4693.175393]  0000000000000000 00000000e6fae80d ffff885cff49b948 ffffffff813273f0
[ 4693.175395]  ffff885cff49b990 ffff885cff49b980 ffffffff8107c816 ffff882c2b7e5000
[ 4693.175396]  ffff882fa36885d0 ffff885fa53b8d98 0000000000000001 ffffffffffffffef
[ 4693.175398] Call Trace:
[ 4693.175402]  [<ffffffff813273f0>] dump_stack+0x44/0x64
[ 4693.175405]  [<ffffffff8107c816>] warn_slowpath_common+0x86/0xc0
[ 4693.175407]  [<ffffffff8107c8ac>] warn_slowpath_fmt+0x5c/0x80
[ 4693.175409]  [<ffffffff81272d68>] ? kernfs_path+0x48/0x60
[ 4693.175410]  [<ffffffff812763d4>] sysfs_warn_dup+0x64/0x80
[ 4693.175412]  [<ffffffff8127676a>] sysfs_do_create_link_sd.isra.2+0xaa/0xb0
[ 4693.175414]  [<ffffffff81276795>] sysfs_create_link+0x25/0x40
[ 4693.175417]  [<ffffffff8146db9b>] bus_add_device+0x10b/0x1f0
[ 4693.175419]  [<ffffffff8146b945>] device_add+0x3b5/0x610
[ 4693.175422]  [<ffffffff814acd85>] scsi_sysfs_add_sdev+0xa5/0x290
[ 4693.175424]  [<ffffffff814aa2e5>] scsi_probe_and_add_lun+0xb65/0xd80
[ 4693.175427]  [<ffffffff814799dc>] ? __pm_runtime_resume+0x5c/0x70
[ 4693.175429]  [<ffffffff814aacf7>] __scsi_scan_target+0xf7/0x260
[ 4693.175430]  [<ffffffff814799dc>] ? __pm_runtime_resume+0x5c/0x70
[ 4693.175432]  [<ffffffff814aaf37>] scsi_scan_target+0xd7/0xf0
[ 4693.175440]  [<ffffffffa06b49f5>] iscsi_user_scan_session.part.14+0x105/0x140 [scsi_transport_iscsi]
[ 4693.175443]  [<ffffffffa06b4a30>] ? iscsi_user_scan_session.part.14+0x140/0x140 [scsi_transport_iscsi]
[ 4693.175446]  [<ffffffffa06b4a4e>] iscsi_user_scan_session+0x1e/0x30 [scsi_transport_iscsi]
[ 4693.175448]  [<ffffffff81469cb0>] device_for_each_child+0x50/0x90
[ 4693.175451]  [<ffffffffa06b283d>] iscsi_user_scan+0x3d/0x60 [scsi_transport_iscsi]
[ 4693.175453]  [<ffffffff814acb46>] store_scan+0xa6/0x100
[ 4693.175456]  [<ffffffff811da078>] ? __kmalloc+0x1b8/0x250
[ 4693.175458]  [<ffffffff81469448>] dev_attr_store+0x18/0x30
[ 4693.175459]  [<ffffffff81275aca>] sysfs_kf_write+0x3a/0x50
[ 4693.175461]  [<ffffffff81275150>] kernfs_fop_write+0x120/0x170
[ 4693.175464]  [<ffffffff811f98d7>] __vfs_write+0x37/0x100
[ 4693.175467]  [<ffffffff812ab4b3>] ? selinux_file_permission+0xc3/0x110
[ 4693.175469]  [<ffffffff812a300d>] ? security_file_permission+0x3d/0xc0
[ 4693.175485]  [<ffffffff810c5f2f>] ? percpu_down_read+0x1f/0x50
[ 4693.175486]  [<ffffffff811f9fb2>] vfs_write+0xa2/0x1a0
[ 4693.175489]  [<ffffffff81003176>] ? do_audit_syscall_entry+0x66/0x70
[ 4693.175491]  [<ffffffff811fad75>] SyS_write+0x55/0xc0
[ 4693.175493]  [<ffffffff816e406e>] entry_SYSCALL_64_fastpath+0x12/0x71
[ 4693.175495] ---[ end trace 67e92c68518cd764 ]---
[ 4693.175516] scsi 8:0:0:0: failed to add device: -17
[ 4702.252060] scsi 8:0:0:0: Direct-Access     LIO-ORG  IBLOCK           4.0  PQ: 0 ANSI: 5
[ 4702.252482] ------------[ cut here ]------------
[ 4702.252488] WARNING: CPU: 2 PID: 17390 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x64/0x80()
[ 4702.252489] sysfs: cannot create duplicate filename '/bus/scsi/devices/8:0:0:0'
[ 4702.252490] Modules linked in: target_core_user target_core_pscsi target_core_file target_core_iblock binfmt_misc xt_REDIRECT nf_nat_redirect xt_nat xt_mark xt_conntrack xt_CHECKSUM iptable_raw ebtable_filter ebtables ip6table_filter ip6_tables iscsi_tcp libiscsi_tcp bnx2fc cnic uio fcoe 8021q garp mrp openvswitch nf_defrag_ipv6 bonding rpcrdma ib_isert iscsi_target_mod ib_iser libiscsi scsi_transport_iscsi ib_srpt target_core_mod ib_srp scsi_transport_srp ib_ipoib rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm ib_cm iw_cm ib_sa ib_mad usnic_verbs ib_core ib_addr xt_comment xt_multiport iptable_filter iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul aesni_intel
[ 4702.252523]  lrw gf128mul glue_helper ablk_helper cryptd ipmi_devintf ses enclosure sg ipmi_si 8250_fintek ipmi_msghandler joydev input_leds sb_edac iTCO_wdt iTCO_vendor_support pcspkr shpchp lpc_ich edac_core mfd_core wmi acpi_power_meter nfsd auth_rpcgss nfs_acl lockd grace sunrpc dm_multipath ip_tables xfs libcrc32c sd_mod crc32c_intel mgag200 megaraid_sas drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm libfcoe libfc scsi_transport_fc enic ixgbe(O) i40e vxlan ip6_udp_tunnel igb udp_tunnel ptp pps_core dca i2c_algo_bit fjes dm_mirror dm_region_hash dm_log dm_mod [last unloaded: fnic]
[ 4702.252553] CPU: 2 PID: 17390 Comm: iscsiadm Tainted: G        W  O    4.4.0-1.el7.elrepo.x86_64 #1
[ 4702.252554] Hardware name: Cisco Systems Inc UCSC-C240-M3S/UCSC-C240-M3S, BIOS C240M3.2.0.8.0.071620152208 07/16/2015
[ 4702.252556]  0000000000000000 0000000043b94d0c ffff882c2fb77948 ffffffff813273f0
[ 4702.252557]  ffff882c2fb77990 ffff882c2fb77980 ffffffff8107c816 ffff882fa32a9000
[ 4702.252559]  ffff882fa4a34b80 ffff885fa53b8d98 0000000000000001 ffffffffffffffef
[ 4702.252561] Call Trace:
[ 4702.252565]  [<ffffffff813273f0>] dump_stack+0x44/0x64
[ 4702.252568]  [<ffffffff8107c816>] warn_slowpath_common+0x86/0xc0
[ 4702.252570]  [<ffffffff8107c8ac>] warn_slowpath_fmt+0x5c/0x80
[ 4702.252572]  [<ffffffff81272d68>] ? kernfs_path+0x48/0x60
[ 4702.252573]  [<ffffffff812763d4>] sysfs_warn_dup+0x64/0x80
[ 4702.252576]  [<ffffffff8127676a>] sysfs_do_create_link_sd.isra.2+0xaa/0xb0
[ 4702.252577]  [<ffffffff81276795>] sysfs_create_link+0x25/0x40
[ 4702.252581]  [<ffffffff8146db9b>] bus_add_device+0x10b/0x1f0
[ 4702.252583]  [<ffffffff8146b945>] device_add+0x3b5/0x610
[ 4702.252585]  [<ffffffff814acd85>] scsi_sysfs_add_sdev+0xa5/0x290
[ 4702.252588]  [<ffffffff814aa2e5>] scsi_probe_and_add_lun+0xb65/0xd80
[ 4702.252591]  [<ffffffff814799dc>] ? __pm_runtime_resume+0x5c/0x70
[ 4702.252594]  [<ffffffff814aacf7>] __scsi_scan_target+0xf7/0x260
[ 4702.252596]  [<ffffffff814799dc>] ? __pm_runtime_resume+0x5c/0x70
[ 4702.252597]  [<ffffffff814aaf37>] scsi_scan_target+0xd7/0xf0
[ 4702.252606]  [<ffffffffa06b49f5>] iscsi_user_scan_session.part.14+0x105/0x140 [scsi_transport_iscsi]
[ 4702.252609]  [<ffffffffa06b4a30>] ? iscsi_user_scan_session.part.14+0x140/0x140 [scsi_transport_iscsi]
[ 4702.252612]  [<ffffffffa06b4a4e>] iscsi_user_scan_session+0x1e/0x30 [scsi_transport_iscsi]
[ 4702.252615]  [<ffffffff81469cb0>] device_for_each_child+0x50/0x90
[ 4702.252619]  [<ffffffffa06b283d>] iscsi_user_scan+0x3d/0x60 [scsi_transport_iscsi]
[ 4702.252620]  [<ffffffff814acb46>] store_scan+0xa6/0x100
[ 4702.252623]  [<ffffffff811da078>] ? __kmalloc+0x1b8/0x250
[ 4702.252625]  [<ffffffff81469448>] dev_attr_store+0x18/0x30
[ 4702.252627]  [<ffffffff81275aca>] sysfs_kf_write+0x3a/0x50
[ 4702.252628]  [<ffffffff81275150>] kernfs_fop_write+0x120/0x170
[ 4702.252631]  [<ffffffff811f98d7>] __vfs_write+0x37/0x100
[ 4702.252635]  [<ffffffff812ab4b3>] ? selinux_file_permission+0xc3/0x110
[ 4702.252638]  [<ffffffff812a300d>] ? security_file_permission+0x3d/0xc0
[ 4702.252641]  [<ffffffff810c5f2f>] ? percpu_down_read+0x1f/0x50
[ 4702.252643]  [<ffffffff811f9fb2>] vfs_write+0xa2/0x1a0
[ 4702.252646]  [<ffffffff81003176>] ? do_audit_syscall_entry+0x66/0x70
[ 4702.252649]  [<ffffffff811fad75>] SyS_write+0x55/0xc0
[ 4702.252652]  [<ffffffff816e406e>] entry_SYSCALL_64_fastpath+0x12/0x71
[ 4702.252653] ---[ end trace 67e92c68518cd765 ]---
[ 4702.252673] scsi 8:0:0:0: failed to add device: -17
[ 4718.329596] scsi 8:0:0:0: Direct-Access     LIO-ORG  IBLOCK           4.0  PQ: 0 ANSI: 5
[ 4718.329884] ------------[ cut here ]------------

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