Public bug reported:

The system in question crashes regularly (~1 week between crashes),
ceasing up all FC activity on the box. It's a ZFS storage server
operating in FC LIO target mode.

Here's the most recent one:

Dec 11 16:32:29 vpig kernel: [604205.252141] ------------[ cut here 
]------------
Dec 11 16:32:29 vpig kernel: [604205.253873] kernel BUG at 
/build/linux-FmWmUC/linux-4.4.0/drivers/scsi/qla2xxx/qla_target.c:3300!
Dec 11 16:32:29 vpig kernel: [604205.254948] invalid opcode: 0000 [#1] SMP 
Dec 11 16:32:29 vpig kernel: [604205.255954] Modules linked in: btrfs ufs qnx4 
hfsplus hfs minix ntfs msdos jfs xfs binfmt_misc target_core_user uio tcm_fc 
libfc tcm_qla2xxx vhost_scsi vhost iscsi_target_mod tcm_loop ib_srpt ib_cm 
ib_sa ib_mad ib_core ib_addr tcm_usb_gadget libcomposite udc_core 
target_core_file targe
t_core_iblock target_core_pscsi target_core_mod configfs ipmi_devintf 
nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables nf_conntrack_ipv4 
nf_defrag_ipv4 xt_comment xt_multiport xt_conntrack nf_conntrack iptable_filter 
ip_tables x_tables zfs(PO) zunicode(PO) zcommon(PO) znvpair(PO) spl(O) zavl(PO) 
intel_rapl 
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass 
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw 
gf128mul glue_helper ablk_helper cryptd sb_edac edac_core joydev input_leds 
lpc_ich mei_me mei ioatdma ipmi_ssif shpchp ipmi_si 8250_fintek ipmi_msghandler 
acpi_power_mete
r acpi_pad mac_hid nfsd auth_rpcgss nfs_acl lockd grace sunrpc bonding 8021q 
garp mrp stp llc lp parport autofs4 raid10 raid456 async_raid6_recov 
async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid0 multipath 
linear raid1 ses enclosure hid_generic ast ttm drm_kms_helper syscopyarea igb 
sysfillrect sys
imgblt dca fb_sys_fops qla2xxx mpt3sas ptp scsi_transport_fc usbhid drm ahci 
raid_class pps_core hid libahci scsi_transport_sas i2c_algo_bit wmi fjes
Dec 11 16:32:29 vpig kernel: [604205.267480] CPU: 8 PID: 9998 Comm: 
kworker/u24:0 Tainted: P           O    4.4.0-101-generic #124-Ubuntu
Dec 11 16:32:29 vpig kernel: [604205.268972] Hardware name: Supermicro 
X10DRi/X10DRi, BIOS 1.1a 10/16/2015
Dec 11 16:32:29 vpig kernel: [604205.270516] Workqueue: tmr-iblock 
target_tmr_work [target_core_mod]
Dec 11 16:32:29 vpig kernel: [604205.272051] task: ffff881038cdc600 ti: 
ffff880ed1f60000 task.ti: ffff880ed1f60000
Dec 11 16:32:29 vpig kernel: [604205.273617] RIP: 0010:[<ffffffffc02554ed>]  
[<ffffffffc02554ed>] qlt_free_cmd+0x14d/0x170 [qla2xxx]
Dec 11 16:32:29 vpig kernel: [604205.275278] RSP: 0018:ffff880ed1f63d08  
EFLAGS: 00010202
Dec 11 16:32:29 vpig kernel: [604205.276901] RAX: 0000000000000000 RBX: 
ffff882019ba6968 RCX: ffffffffc027cc25
Dec 11 16:32:29 vpig kernel: [604205.278561] RDX: 000000000000e074 RSI: 
ffff882033a957d8 RDI: 0000000000004000
Dec 11 16:32:29 vpig kernel: [604205.280228] RBP: ffff880ed1f63d28 R08: 
ffffffffc0269a20 R09: ffff882019ba6968
Dec 11 16:32:29 vpig kernel: [604205.281907] R10: ffff881ebb3d5500 R11: 
ffff881038cdc660 R12: ffff88100bea0000
Dec 11 16:32:29 vpig kernel: [604205.283596] R13: ffff882029319970 R14: 
ffff882019ba6a78 R15: 0000000000000246
Dec 11 16:32:29 vpig kernel: [604205.285315] FS:  0000000000000000(0000) 
GS:ffff88207fc80000(0000) knlGS:0000000000000000
Dec 11 16:32:29 vpig kernel: [604205.287046] CS:  0010 DS: 0000 ES: 0000 CR0: 
0000000080050033
Dec 11 16:32:29 vpig kernel: [604205.288798] CR2: 00007fba2488a7a0 CR3: 
0000000001e0a000 CR4: 00000000001406e0
Dec 11 16:32:29 vpig kernel: [604205.290582] Stack:
Dec 11 16:32:29 vpig kernel: [604205.292357]  ffffffff000037cc ffff882019ba6a7c 
ffff882019ba6968 ffff882029319970
Dec 11 16:32:29 vpig kernel: [604205.294212]  ffff880ed1f63d38 ffffffffc0b5ff14 
ffff880ed1f63d70 ffffffffc09fda7d
Dec 11 16:32:29 vpig kernel: [604205.296068]  ffff882019ba6968 ffff882019ba6968 
ffff880fc5fc0000 0000000000125ca4
Dec 11 16:32:29 vpig kernel: [604205.297932] Call Trace:
Dec 11 16:32:29 vpig kernel: [604205.299804]  [<ffffffffc0b5ff14>] 
tcm_qla2xxx_release_cmd+0x14/0x30 [tcm_qla2xxx]
Dec 11 16:32:29 vpig kernel: [604205.301754]  [<ffffffffc09fda7d>] 
target_release_cmd_kref+0xad/0x110 [target_core_mod]
Dec 11 16:32:29 vpig kernel: [604205.303713]  [<ffffffffc09fdb0f>] 
target_put_sess_cmd+0x2f/0x60 [target_core_mod]
Dec 11 16:32:29 vpig kernel: [604205.305685]  [<ffffffffc09f99c7>] 
core_tmr_abort_task+0x137/0x190 [target_core_mod]
Dec 11 16:32:29 vpig kernel: [604205.307676]  [<ffffffffc09fcd86>] 
target_tmr_work+0x116/0x130 [target_core_mod]
Dec 11 16:32:29 vpig kernel: [604205.309668]  [<ffffffff8109a635>] 
process_one_work+0x165/0x480
Dec 11 16:32:29 vpig kernel: [604205.311669]  [<ffffffff8109a99b>] 
worker_thread+0x4b/0x4c0
Dec 11 16:32:29 vpig kernel: [604205.313676]  [<ffffffff8109a950>] ? 
process_one_work+0x480/0x480
Dec 11 16:32:29 vpig kernel: [604205.315682]  [<ffffffff810a0c75>] 
kthread+0xe5/0x100
Dec 11 16:32:29 vpig kernel: [604205.317699]  [<ffffffff810a0b90>] ? 
kthread_create_on_node+0x1e0/0x1e0
Dec 11 16:32:29 vpig kernel: [604205.319739]  [<ffffffff81844b8f>] 
ret_from_fork+0x3f/0x70
Dec 11 16:32:29 vpig kernel: [604205.321778]  [<ffffffff810a0b90>] ? 
kthread_create_on_node+0x1e0/0x1e0
Dec 11 16:32:29 vpig kernel: [604205.323837] Code: ed 5e c1 0f b6 83 ac 02 00 
00 e9 3f ff ff ff be f2 0c 00 00 48 c7 c7 90 67 27 c0 e8 2e bf e2 c0 48 83 c4 
08 5b 41 5c 41 5d 5d c3 <0f> 0b 0f 0b 48 8b bb b0 02 00 00 e8 93 a1 f9 c0 e9 2c 
ff ff ff 
Dec 11 16:32:29 vpig kernel: [604205.328295] RIP  [<ffffffffc02554ed>] 
qlt_free_cmd+0x14d/0x170 [qla2xxx]
Dec 11 16:32:29 vpig kernel: [604205.330543]  RSP <ffff880ed1f63d08>
Dec 11 16:32:29 vpig kernel: [604205.342671] ---[ end trace afb37fcf983da116 
]---
Dec 11 16:32:29 vpig kernel: [604205.348897] BUG: unable to handle kernel 
paging request at ffffffffffffffd8
Dec 11 16:32:29 vpig kernel: [604205.348916] IP: [<ffffffff810a1320>] 
kthread_data+0x10/0x20
Dec 11 16:32:29 vpig kernel: [604205.348922] PGD 1e0d067 PUD 1e0f067 PMD 0 
Dec 11 16:32:29 vpig kernel: [604205.348924] Oops: 0000 [#2] SMP 
Dec 11 16:32:29 vpig kernel: [604205.349000] Modules linked in: btrfs ufs qnx4 
hfsplus hfs minix ntfs msdos jfs xfs binfmt_misc target_core_user uio tcm_fc 
libfc tcm_qla2xxx vhost_scsi vhost iscsi_target_mod tcm_loop ib_srpt ib_cm 
ib_sa ib_mad ib_core ib_addr tcm_usb_gadget libcomposite udc_core 
target_core_file target_core_iblock target_core_pscsi target_core_mod configfs 
ipmi_devintf nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables 
nf_conntrack_ipv4 nf_defrag_ipv4 xt_comment xt_multiport xt_conntrack 
nf_conntrack iptable_filter ip_tables x_tables zfs(PO) zunicode(PO) zcommon(PO) 
znvpair(PO) spl(O) zavl(PO) intel_rapl x86_pkg_temp_thermal intel_powerclamp 
coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul 
ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper 
cryptd sb_edac edac_core joydev input_leds lpc_ich mei_me mei ioatdma ipmi_ssif 
shpchp ipmi_si 8250_fintek ipmi_msghandler acpi_power_meter acpi_pad mac_hid 
nfsd auth_rpcgss nfs_acl lockd grace sunrpc bonding 8021q garp mrp stp llc lp 
parport autofs4 raid10 raid456 async_raid6_recov async_memcpy async_pq 
async_xor async_tx xor raid6_pq libcrc32c raid0 multipath linear raid1 ses 
enclosure hid_generic ast ttm drm_kms_helper syscopyarea igb sysfillrect 
sysimgblt dca fb_sys_fops qla2xxx mpt3sas ptp scsi_transport_fc usbhid drm ahci 
raid_class pps_core hid libahci scsi_transport_sas i2c_algo_bit wmi fjes
Dec 11 16:32:29 vpig kernel: [604205.349058] CPU: 8 PID: 9998 Comm: 
kworker/u24:0 Tainted: P      D    O    4.4.0-101-generic #124-Ubuntu
Dec 11 16:32:29 vpig kernel: [604205.349059] Hardware name: Supermicro 
X10DRi/X10DRi, BIOS 1.1a 10/16/2015
Dec 11 16:32:29 vpig kernel: [604205.349084] task: ffff881038cdc600 ti: 
ffff880ed1f60000 task.ti: ffff880ed1f60000
Dec 11 16:32:29 vpig kernel: [604205.349088] RIP: 0010:[<ffffffff810a1320>]  
[<ffffffff810a1320>] kthread_data+0x10/0x20
Dec 11 16:32:29 vpig kernel: [604205.349091] RSP: 0018:ffff880ed1f639d8  
EFLAGS: 00010002
Dec 11 16:32:29 vpig kernel: [604205.349092] RAX: 0000000000000000 RBX: 
0000000000000008 RCX: ffffffff8210ae40
Dec 11 16:32:29 vpig kernel: [604205.349093] RDX: 0000000000000008 RSI: 
0000000000000008 RDI: ffff881038cdc600
Dec 11 16:32:29 vpig kernel: [604205.349097] RBP: ffff880ed1f639d8 R08: 
00000000ffffffff R09: 0000000000000000
Dec 11 16:32:29 vpig kernel: [604205.349098] R10: ffff881038cdc660 R11: 
000000000001c800 R12: 0000000000000000
Dec 11 16:32:29 vpig kernel: [604205.349099] R13: 0000000000016e00 R14: 
ffff881038cdc600 R15: ffff88207fc96e00
Dec 11 16:32:29 vpig kernel: [604205.349101] FS:  0000000000000000(0000) 
GS:ffff88207fc80000(0000) knlGS:0000000000000000
Dec 11 16:32:29 vpig kernel: [604205.349104] CS:  0010 DS: 0000 ES: 0000 CR0: 
0000000080050033
Dec 11 16:32:29 vpig kernel: [604205.349108] CR2: 0000000000000028 CR3: 
0000000001e0a000 CR4: 00000000001406e0
Dec 11 16:32:29 vpig kernel: [604205.349110] Stack:
Dec 11 16:32:29 vpig kernel: [604205.349112]  ffff880ed1f639f0 ffffffff8109b9d1 
ffff88207fc96e00 ffff880ed1f63a40
Dec 11 16:32:29 vpig kernel: [604205.349115]  ffffffff818402c0 ffff880ed1f63a58 
ffffffff00000008 ffff881038cdc600
Dec 11 16:32:29 vpig kernel: [604205.349117]  ffff880ed1f64000 ffff881038cdccd0 
ffff880ed1f635f0 0000000000000000
Dec 11 16:32:29 vpig kernel: [604205.349117] Call Trace:
Dec 11 16:32:29 vpig kernel: [604205.349128]  [<ffffffff8109b9d1>] 
wq_worker_sleeping+0x11/0x90
Dec 11 16:32:29 vpig kernel: [604205.349144]  [<ffffffff818402c0>] 
__schedule+0x650/0xa30
Dec 11 16:32:29 vpig kernel: [604205.349148]  [<ffffffff818406d5>] 
schedule+0x35/0x80
Dec 11 16:32:29 vpig kernel: [604205.349164]  [<ffffffff81084435>] 
do_exit+0x775/0xb00
Dec 11 16:32:29 vpig kernel: [604205.349176]  [<ffffffff81031c41>] 
oops_end+0xa1/0xd0
Dec 11 16:32:29 vpig kernel: [604205.349179]  [<ffffffff810320fb>] die+0x4b/0x70
Dec 11 16:32:29 vpig kernel: [604205.349184]  [<ffffffff8102f121>] 
do_trap+0xb1/0x140
Dec 11 16:32:29 vpig kernel: [604205.349192]  [<ffffffff8102f4a9>] 
do_error_trap+0x89/0x110
Dec 11 16:32:29 vpig kernel: [604205.349254]  [<ffffffffc02554ed>] ? 
qlt_free_cmd+0x14d/0x170 [qla2xxx]
Dec 11 16:32:29 vpig kernel: [604205.349268]  [<ffffffff810ab620>] ? 
check_preempt_curr+0x80/0x90
Dec 11 16:32:29 vpig kernel: [604205.349273]  [<ffffffff810ab649>] ? 
ttwu_do_wakeup+0x19/0xe0
Dec 11 16:32:29 vpig kernel: [604205.349276]  [<ffffffff8102fa10>] 
do_invalid_op+0x20/0x30
Dec 11 16:32:29 vpig kernel: [604205.349281]  [<ffffffff8184630e>] 
invalid_op+0x1e/0x30
Dec 11 16:32:29 vpig kernel: [604205.349294]  [<ffffffffc02554ed>] ? 
qlt_free_cmd+0x14d/0x170 [qla2xxx]
Dec 11 16:32:29 vpig kernel: [604205.349308]  [<ffffffffc02553f4>] ? 
qlt_free_cmd+0x54/0x170 [qla2xxx]
Dec 11 16:32:29 vpig kernel: [604205.349321]  [<ffffffffc0b5ff14>] 
tcm_qla2xxx_release_cmd+0x14/0x30 [tcm_qla2xxx]
Dec 11 16:32:29 vpig kernel: [604205.349380]  [<ffffffffc09fda7d>] 
target_release_cmd_kref+0xad/0x110 [target_core_mod]
Dec 11 16:32:29 vpig kernel: [604205.349401]  [<ffffffffc09fdb0f>] 
target_put_sess_cmd+0x2f/0x60 [target_core_mod]
Dec 11 16:32:29 vpig kernel: [604205.349424]  [<ffffffffc09f99c7>] 
core_tmr_abort_task+0x137/0x190 [target_core_mod]
Dec 11 16:32:29 vpig kernel: [604205.349442]  [<ffffffffc09fcd86>] 
target_tmr_work+0x116/0x130 [target_core_mod]
Dec 11 16:32:29 vpig kernel: [604205.349448]  [<ffffffff8109a635>] 
process_one_work+0x165/0x480
Dec 11 16:32:29 vpig kernel: [604205.349455]  [<ffffffff8109a99b>] 
worker_thread+0x4b/0x4c0
Dec 11 16:32:29 vpig kernel: [604205.349460]  [<ffffffff8109a950>] ? 
process_one_work+0x480/0x480
Dec 11 16:32:29 vpig kernel: [604205.349463]  [<ffffffff810a0c75>] 
kthread+0xe5/0x100
Dec 11 16:32:29 vpig kernel: [604205.349465]  [<ffffffff810a0b90>] ? 
kthread_create_on_node+0x1e0/0x1e0
Dec 11 16:32:29 vpig kernel: [604205.349470]  [<ffffffff81844b8f>] 
ret_from_fork+0x3f/0x70
Dec 11 16:32:29 vpig kernel: [604205.349473]  [<ffffffff810a0b90>] ? 
kthread_create_on_node+0x1e0/0x1e0
Dec 11 16:32:29 vpig kernel: [604205.349500] Code: ff ff ff be 49 02 00 00 48 
c7 c7 08 c1 cb 81 e8 07 01 fe ff e9 a6 fe ff ff 66 90 0f 1f 44 00 00 48 8b 87 
18 05 00 00 55 48 89 e5 <48> 8b 40 d8 5d c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 
44 00 00 
Dec 11 16:32:29 vpig kernel: [604205.349503] RIP  [<ffffffff810a1320>] 
kthread_data+0x10/0x20
Dec 11 16:32:29 vpig kernel: [604205.349504]  RSP <ffff880ed1f639d8>
Dec 11 16:32:29 vpig kernel: [604205.349504] CR2: ffffffffffffffd8
Dec 11 16:32:29 vpig kernel: [604205.349516] ---[ end trace afb37fcf983da117 
]---
[...]

Here's another one:

[264358.335994] ABORT_TASK: Found referenced qla2xxx task_tag: 1230096
[264358.462896] ------------[ cut here ]------------
[264358.462937] kernel BUG at 
/build/linux-FmWmUC/linux-4.4.0/drivers/scsi/qla2xxx/qla_target.c:3300!
[264358.462996] invalid opcode: 0000 [#1] SMP 
[264358.463029] Modules linked in: btrfs ufs qnx4 hfsplus hfs minix ntfs msdos 
jfs xfs target_core_user uio tcm_fc libfc tcm_qla2xxx vhost_scsi vhost 
iscsi_target_mod tcm_loop ib_srpt ib_cm ib_sa ib_mad ib_core ib_addr 
tcm_usb_gadget libcomposite udc_core target_core_file target_core_iblock 
target_core_pscsi target_core_mod configfs ipmi_devintf nf_conntrack_ipv6 
nf_defrag_ipv6 ip6table_filter ip6_tables nf_conntrack_ipv4 nf_defrag_ipv4 
xt_comment xt_multiport xt_conntrack nf_conntrack iptable_filter ip_tables 
x_tables zfs(PO) zunicode(PO) zcommon(PO) znvpair(PO) spl(O) zavl(PO) 
intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm 
irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel 
aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd joydev sb_edac edac_core 
input_leds
[264358.463625]  mei_me mei lpc_ich ioatdma ipmi_ssif shpchp acpi_pad ipmi_si 
8250_fintek ipmi_msghandler acpi_power_meter mac_hid nfsd auth_rpcgss nfs_acl 
lockd grace bonding 8021q garp mrp stp llc lp parport sunrpc autofs4 raid10 
raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq 
libcrc32c raid0 multipath linear ses enclosure raid1 igb dca ast ttm 
drm_kms_helper syscopyarea sysfillrect sysimgblt qla2xxx fb_sys_fops 
hid_generic mpt3sas ptp scsi_transport_fc usbhid raid_class drm ahci pps_core 
hid libahci scsi_transport_sas i2c_algo_bit wmi fjes
[264358.464069] CPU: 10 PID: 25862 Comm: kworker/u24:1 Tainted: P           O   
 4.4.0-101-generic #124-Ubuntu
[264358.464130] Hardware name: Supermicro X10DRi/X10DRi, BIOS 1.1a 10/16/2015
[264358.464207] Workqueue: tmr-iblock target_tmr_work [target_core_mod]
[264358.464251] task: ffff88200f8b0e00 ti: ffff881d4d660000 task.ti: 
ffff881d4d660000
[264358.464300] RIP: 0010:[<ffffffffc02464ed>]  [<ffffffffc02464ed>] 
qlt_free_cmd+0x14d/0x170 [qla2xxx]
[264358.464386] RSP: 0018:ffff881d4d663d08  EFLAGS: 00010202
[264358.464422] RAX: 0000000000000000 RBX: ffff88200bda8b78 RCX: 
ffffffffc026dc25
[264358.464469] RDX: 000000000000e074 RSI: ffff882034ff37d8 RDI: 
0000000000004000
[264358.464515] RBP: ffff881d4d663d28 R08: ffffffffc025aa20 R09: 
ffff88200bda8b78
[264358.464560] R10: ffff882035939e00 R11: ffff88200f8b0e60 R12: 
ffff882033087000
[264358.464607] R13: ffff8820107f6f70 R14: ffff88200bda8c88 R15: 
0000000000000246
[264358.464654] FS:  0000000000000000(0000) GS:ffff88207fd00000(0000) 
knlGS:0000000000000000
[264358.464705] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[264358.464744] CR2: 000000c200000738 CR3: 0000000001e0a000 CR4: 
00000000001406e0
[264358.464790] Stack:
[264358.464807]  ffffffff00003836 ffff88200bda8c8c ffff88200bda8b78 
ffff8820107f6f70
[264358.464864]  ffff881d4d663d38 ffffffffc087ff14 ffff881d4d663d70 
ffffffffc0778a7d
[264358.464919]  ffff88200bda8b78 ffff88200bda8b78 ffff8810350d2000 
000000000012c510
[264358.464975] Call Trace:
[264358.465003]  [<ffffffffc087ff14>] tcm_qla2xxx_release_cmd+0x14/0x30 
[tcm_qla2xxx]
[264358.465067]  [<ffffffffc0778a7d>] target_release_cmd_kref+0xad/0x110 
[target_core_mod]
[264358.465129]  [<ffffffffc0778b0f>] target_put_sess_cmd+0x2f/0x60 
[target_core_mod]
[264358.465189]  [<ffffffffc07749c7>] core_tmr_abort_task+0x137/0x190 
[target_core_mod]
[264358.465251]  [<ffffffffc0777d86>] target_tmr_work+0x116/0x130 
[target_core_mod]
[264358.465304]  [<ffffffff8109a635>] process_one_work+0x165/0x480
[264358.465346]  [<ffffffff8109a99b>] worker_thread+0x4b/0x4c0
[264358.465385]  [<ffffffff8109a950>] ? process_one_work+0x480/0x480
[264358.465427]  [<ffffffff810a0c75>] kthread+0xe5/0x100
[264358.465462]  [<ffffffff810a0b90>] ? kthread_create_on_node+0x1e0/0x1e0
[264358.465510]  [<ffffffff81844b8f>] ret_from_fork+0x3f/0x70
[264358.465548]  [<ffffffff810a0b90>] ? kthread_create_on_node+0x1e0/0x1e0
[264358.465590] Code: dd 5f c1 0f b6 83 ac 02 00 00 e9 3f ff ff ff be f2 0c 00 
00 48 c7 c7 90 77 26 c0 e8 2e af e3 c0 48 83 c4 08 5b 41 5c 41 5d 5d c3 <0f> 0b 
0f 0b 48 8b bb b0 02 00 00 e8 93 91 fa c0 e9 2c ff ff ff 
[264358.465833] RIP  [<ffffffffc02464ed>] qlt_free_cmd+0x14d/0x170 [qla2xxx]
[264358.465894]  RSP <ffff881d4d663d08>
[264358.475770] ---[ end trace 5703ee195d6f0b6d ]---


------------------------
INFO:
------------------------

Package version:

targetcli 1:3.0~pre4.1~ga55d018-2
linux-image-generic 4.4.0.103.108

lspci -v:

81:00.0 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI 
Express HBA (rev 02)
        Subsystem: Hewlett-Packard Company ISP2532-based 8Gb Fibre Channel to 
PCI Express HBA
        Physical Slot: 5
        Flags: bus master, fast devsel, latency 0, IRQ 33
        I/O ports at f100 [size=256]
        Memory at fbe84000 (64-bit, non-prefetchable) [size=16K]
        Memory at fbd00000 (64-bit, non-prefetchable) [size=1M]
        Expansion ROM at fbe40000 [disabled] [size=256K]
        Capabilities: [44] Power Management version 3
        Capabilities: [4c] Express Endpoint, MSI 00
        Capabilities: [88] MSI: Enable- Count=1/32 Maskable- 64bit+
        Capabilities: [98] Vital Product Data
        Capabilities: [a0] MSI-X: Enable+ Count=32 Masked-
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [138] Power Budgeting <?>
        Kernel driver in use: qla2xxx
        Kernel modules: qla2xxx

81:00.1 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI 
Express HBA (rev 02)
        Subsystem: Hewlett-Packard Company ISP2532-based 8Gb Fibre Channel to 
PCI Express HBA
        Physical Slot: 5
        Flags: bus master, fast devsel, latency 0, IRQ 61
        I/O ports at f000 [size=256]
        Memory at fbe80000 (64-bit, non-prefetchable) [size=16K]
        Memory at fbc00000 (64-bit, non-prefetchable) [size=1M]
        Expansion ROM at fbe00000 [disabled] [size=256K]
        Capabilities: [44] Power Management version 3
        Capabilities: [4c] Express Endpoint, MSI 00
        Capabilities: [88] MSI: Enable- Count=1/32 Maskable- 64bit+
        Capabilities: [98] Vital Product Data
        Capabilities: [a0] MSI-X: Enable+ Count=32 Masked-
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [138] Power Budgeting <?>
        Kernel driver in use: qla2xxx
        Kernel modules: qla2xxx

System:

    description: Rack Mount Chassis
    product: X10DRi (072815D9)
    vendor: Supermicro

# lsb_release --all
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.3 LTS
Release:        16.04
Codename:       xenial

# cat /etc/modprobe.d/qla2xxx.conf 
options qla2xxx qlini_mode="disabled"

HBA Info (qaucli):

--------------------------------------------------------------------------------
Host Name                      : <redacted>
HBA Model                      : HPAJ764A
Device ISP ID                  : ISP2532
HBA Description                : HP AJ764A PCI-E to 8Gb FC DualChannel
HBA Alias                      : 
Serial Number                  : <redacted>
Driver Version                 : 8.07.00.26-k
Running Firmware Version       : 8.03.00 (90d5)
Flash Image Version            : 00000
Family Firmware Version        : N/A
PCI Bus Number                 : 129
PCI Device Number              : 0
PCI Function Number            : 0
--------------------------------------------------------------------------------

** Affects: linux-meta-lts-xenial (Ubuntu)
     Importance: Undecided
         Status: New

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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1737632

Title:
  qla2xxx in target mode crashes with kernel BUG at /build/linux-
  FmWmUC/linux-4.4.0/drivers/scsi/qla2xxx/qla_target.c:3300

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