I can reproduce this with 4.16-rc2, I've debugged this down to:
drivers/char/hpet.c, hpet_timer_set_irq():
if (irq < HPET_MAX_IRQ) {
spin_lock_irq(&hpet_lock);
v = readl(&timer->hpet_config);
v |= irq << Tn_INT_ROUTE_CNF_SHIFT;
writel(v, &timer->hpet_config);
.. the writel to hpet_config causes the reboot.
How to reproduce this issue:
git clone git://kernel.ubuntu.com/cking/stress-ng
cd stress-ng
git revert 0124b250ec205ea3cd6d9d68fb96c03ac294d12f
make
sudo ./stress-ng --dev 1
.. wait a while and it will eventually get around to the /dev/hpet and
opening this causes the hang.
The minimal reproducer is:
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
int main(void)
{
int fd;
fd = open("/dev/hpet", O_RDONLY | O_NONBLOCK);
if (fd > 0)
close(fd);
exit(0);
}
run this as root and it will cause the reboot.
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Packages, which is subscribed to linux-aws in Ubuntu.
https://bugs.launchpad.net/bugs/1741409
Title:
stress smoke test hang with dev test on AWS Xenial kernel
Status in linux-aws package in Ubuntu:
In Progress
Bug description:
The test will hang on dev STARTING, and get killed by the timeout
setting.
DEBUG| [stdout] dccp PASSED
DEBUG| [stdout] dentry STARTING
DEBUG| [stdout] dentry RETURNED 0
DEBUG| [stdout] dentry PASSED
DEBUG| [stdout] dev STARTING
No interesting output in dmesg:
[ 8.281861] random: nonblocking pool is initialized
[ 8.338335] ppdev: user-space parallel port driver
[ 11.662848] cgroup: new mount options do not match the existing
superblock, will be ignored
[ 12.272168] systemd[1]: Started ACPI event daemon.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-1045-aws 4.4.0-1045.54
ProcVersionSignature: User Name 4.4.0-1045.54-aws 4.4.98
Uname: Linux 4.4.0-1045-aws x86_64
ApportVersion: 2.20.1-0ubuntu2.14
Architecture: amd64
Date: Fri Jan 5 06:47:45 2018
Ec2AMI: ami-a2e544da
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: us-west-2b
Ec2InstanceType: t2.nano
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-aws
UpgradeStatus: No upgrade log present (probably fresh install)
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