I patched the 4.4rc4 kernel source and restarted the test. Shortly
after starting it, this showed up in dmesg:
[Thu Dec 17 03:29:55 2015] WARNING: CPU: 0 PID: 2547 at
fs/ceph/addr.c:1162 ceph_write_begin+0xfb/0x120 [ceph]()
[Thu Dec 17 03:29:55 2015] Modules linked in: iscsi_target_mod
vhost_scsi tcm_qla2xxx ib_srpt tcm_fc tcm_usb_gadget tcm_loop
target_core_file target_core_iblock target_core_pscsi target_core_user
target_core_mod ipmi_devintf vhost qla2xxx ib_cm ib_sa ib_mad ib_core
ib_addr libfc scsi_transport_fc libcomposite udc_core uio configfs ttm
ipmi_ssif drm_kms_helper drm coretemp kvm gpio_ich i2c_algo_bit
i7core_edac fb_sys_fops syscopyarea edac_core sysfillrect sysimgblt
ipmi_si input_leds hpilo ipmi_msghandler shpchp acpi_power_meter
irqbypass serio_raw 8250_fintek lpc_ich mac_hid ceph bonding libceph
lp parport libcrc32c fscache mlx4_en vxlan ip6_udp_tunnel udp_tunnel
ptp pps_core hid_generic usbhid hid mlx4_core hpsa psmouse bnx2 fjes
scsi_transport_sas [last unloaded: target_core_mod]
[Thu Dec 17 03:29:55 2015] CPU: 0 PID: 2547 Comm: iscsi_trx Tainted: G
W I 4.4.0-rc4-ede1 #1
[Thu Dec 17 03:29:55 2015] Hardware name: HP ProLiant DL360 G6, BIOS
P64 01/22/2015
[Thu Dec 17 03:29:55 2015] ffffffffc020cd47 ffff8805f1e97958
ffffffff813ad644 0000000000000000
[Thu Dec 17 03:29:55 2015] ffff8805f1e97990 ffffffff81079702
ffff8805f1e97a50 00000000015dd000
[Thu Dec 17 03:29:55 2015] ffff880c034df800 0000000000000200
ffffea0000b26a80 ffff8805f1e979a0
[Thu Dec 17 03:29:55 2015] Call Trace:
[Thu Dec 17 03:29:55 2015] [<ffffffff813ad644>] dump_stack+0x44/0x60
[Thu Dec 17 03:29:55 2015] [<ffffffff81079702>] warn_slowpath_common+0x82/0xc0
[Thu Dec 17 03:29:55 2015] [<ffffffff810797fa>] warn_slowpath_null+0x1a/0x20
[Thu Dec 17 03:29:55 2015] [<ffffffffc01e53bb>]
ceph_write_begin+0xfb/0x120 [ceph]
[Thu Dec 17 03:29:55 2015] [<ffffffff8117c8df>]
generic_perform_write+0xbf/0x1a0
[Thu Dec 17 03:29:55 2015] [<ffffffffc01dff9c>]
ceph_write_iter+0xf5c/0x1010 [ceph]
[Thu Dec 17 03:29:55 2015] [<ffffffff810a888c>] ? __enqueue_entity+0x6c/0x70
[Thu Dec 17 03:29:55 2015] [<ffffffff813c0003>] ?
iov_iter_get_pages+0x113/0x210
[Thu Dec 17 03:29:55 2015] [<ffffffff816b6802>] ?
skb_copy_datagram_iter+0x122/0x250
[Thu Dec 17 03:29:55 2015] [<ffffffff811f6c93>] vfs_iter_write+0x63/0xa0
[Thu Dec 17 03:29:55 2015] [<ffffffffc03c3f29>]
fd_do_rw.isra.5+0xc9/0x1b0 [target_core_file]
[Thu Dec 17 03:29:55 2015] [<ffffffffc03c40d5>]
fd_execute_rw+0xc5/0x2a0 [target_core_file]
[Thu Dec 17 03:29:55 2015] [<ffffffffc0445e72>]
sbc_execute_rw+0x22/0x30 [target_core_mod]
[Thu Dec 17 03:29:55 2015] [<ffffffffc04449cf>]
__target_execute_cmd+0x1f/0x70 [target_core_mod]
[Thu Dec 17 03:29:55 2015] [<ffffffffc0445525>]
target_execute_cmd+0x195/0x2a0 [target_core_mod]
[Thu Dec 17 03:29:55 2015] [<ffffffffc05c978a>]
iscsit_execute_cmd+0x20a/0x270 [iscsi_target_mod]
[Thu Dec 17 03:29:55 2015] [<ffffffffc05d28da>]
iscsit_sequence_cmd+0xda/0x190 [iscsi_target_mod]
[Thu Dec 17 03:29:55 2015] [<ffffffffc05d8c4d>]
iscsi_target_rx_thread+0x51d/0xe30 [iscsi_target_mod]
[Thu Dec 17 03:29:55 2015] [<ffffffff8101463d>] ? __switch_to+0x1cd/0x570
[Thu Dec 17 03:29:55 2015] [<ffffffffc05d8730>] ?
iscsi_target_tx_thread+0x1c0/0x1c0 [iscsi_target_mod]
[Thu Dec 17 03:29:55 2015] [<ffffffff810974c9>] kthread+0xc9/0xe0
[Thu Dec 17 03:29:55 2015] [<ffffffff81097400>] ?
kthread_create_on_node+0x180/0x180
[Thu Dec 17 03:29:55 2015] [<ffffffff817c794f>] ret_from_fork+0x3f/0x70
[Thu Dec 17 03:29:55 2015] [<ffffffff81097400>] ?
kthread_create_on_node+0x180/0x180
[Thu Dec 17 03:29:55 2015] ---[ end trace 382a45986961da4e ]---
There are WARNINGs on both line 125 and 1162. I will attached the
whole set of dmesg output to the tracker ticket 14086
I wanted to note that file system snapshots are enabled and being used
on this file system.
Thanks
Eric
On Wed, Dec 16, 2015 at 8:15 AM, Eric Eastman
<eric.eastman@xxxxxxxxxxxxxx> wrote:
>>>
>> This warning is really strange. Could you try the attached debug patch.
>>
>> Regards
>> Yan, Zheng
>
> I will try the patch and get back to the list.
>
> Eric
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