xenial: soft lockup in check_unsafe_exec()
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
In Progress
|
High
|
Unassigned |
Bug Description
Endless cycle was detected few times during ubuntu 16.04 testing insied openvz VMs
dmesg output and crash dump ivestigation shows that foolowing ubuntu 16.04.patch is guilty
commit d6572202d986a84
Author: Colin Ian King <email address hidden>
Date: Fri May 12 15:51:56 2017 +0100
UBUNTU:SAUCE: exec: ensure file system accounting in check_unsafe_exec is correct
BugLink: http://
fs/exec.c:: check_unsafe_exec()
...
recheck:
fs_recheck = false;
t = p;
n_fs = 1;
if (t->fs == p->fs)
if (t->flags & (PF_EXITING | PF_FORKNOEXEC))
}
if (p->fs->users > n_fs) {
if (fs_recheck) {
}
} else
dmesg example is attached,
let me know if you want to look at crash dump image.
Bug is xenial-specific (4.4 kernel), other kernel branches seems are not affected.
Changed in linux (Ubuntu): | |
status: | Incomplete → Invalid |
status: | Invalid → Confirmed |
Changed in linux (Ubuntu): | |
importance: | Undecided → High |
assignee: | nobody → Colin Ian King (colin-king) |
status: | Confirmed → In Progress |
Changed in linux (Ubuntu): | |
assignee: | Colin Ian King (colin-king) → nobody |
This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1876856
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.