** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1862682
Title:
iSCSI-target: Deleting a LUN hangs in the kernel
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Eoan:
Triaged
Bug description:
The issue is that deleting a LUN on the target will hang until IO is
attempted to this LUN from the initiator.
This issue was introduced when linux-image-generic-hwe-18.04 switched
from the 5.0 to the 5.3 kernel. Source package is "linux-meta-hwe". OS
is Ubuntu 18.04.4 LTS.
We can see a hung task message in dmesg:
[ 1330.438613] INFO: task iscsicmd:24572 blocked for more than 120 seconds.
[ 1330.439554] Tainted: P OE 5.3.0-26-generic
#28~18.04.1-Ubuntu
[ 1330.440594] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 1330.441666] iscsicmd D 0 24572 8910 0x00000080
[ 1330.441668] Call Trace:
[ 1330.441674] __schedule+0x2a8/0x670
[ 1330.441676] schedule+0x33/0xa0
[ 1330.441678] schedule_timeout+0x1d3/0x2f0
[ 1330.441682] ? __kfifo_to_user_r+0xb0/0xb0
[ 1330.441684] wait_for_completion+0xba/0x140
[ 1330.441688] ? wake_up_q+0x80/0x80
[ 1330.441704] transport_clear_lun_ref+0x27/0x30 [target_core_mod]
[ 1330.441711] core_tpg_remove_lun+0x35/0x100 [target_core_mod]
[ 1330.441716] core_dev_del_lun+0x26/0x70 [target_core_mod]
[ 1330.441721] target_fabric_port_unlink+0x4a/0x50 [target_core_mod]
[ 1330.441724] configfs_unlink+0xea/0x1b0
[ 1330.441727] vfs_unlink+0x111/0x200
[ 1330.441729] do_unlinkat+0x2ad/0x320
[ 1330.441731] __x64_sys_unlink+0x23/0x30
[ 1330.441734] do_syscall_64+0x5a/0x130
[ 1330.441736] entry_SYSCALL_64_after_hwframe+0x44/0xa9
(iscsicmd is a cli tool I created that is similar to targetcli)
You can find more details about this bug and the reproducer on this
linux kernel discussion thread: https://lkml.org/lkml/2020/2/7/585
A patch has been already submitted by an iSCSI-target developer,
although not yet integrated. (https://marc.info/?l=target-
devel&m=158134893208641&w=2)
Would it be possible to get this patch integrated into the linux-
image-generic-hwe-18.04 package, and if yes, then what would be the
required next steps?
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-generic-hwe-18.04 5.3.0.28.96
ProcVersionSignature: Ubuntu 5.3.0-28.30~18.04.1-generic 5.3.13
Uname: Linux 5.3.0-28-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
Date: Mon Feb 10 18:41:12 2020
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=C.UTF-8
SHELL=/bin/bash
SourcePackage: linux-meta-hwe
UpgradeStatus: No upgrade log present (probably fresh install)
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