On Thu, 2017-03-09 at 11:22 +0100, Thomas Gleixner wrote:
> > In contrast with previous tests this morning I have been able to reproduce
> > this hang with kernel v4.10. So it's not a kernel v4.10 regression. But the
> > hang did not occur in a test with kernel v4.9.7. I assume this means that
> > the regression got introduced between the v4.9 and v4.10 kernels.
>
> Is it always the x86_pkg_thermal init which locks up?
Hello Thomas,
Apparently not. Here are a few other call traces that appeared in the system
log:
INFO: task systemd-udevd:748 blocked for more than 480 seconds.
Tainted: G IO 4.11.0-rc1-dbg+ #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
systemd-udevd D 0 748 518 0x00000104
Call Trace:
__schedule+0x302/0xc30
schedule+0x38/0x90
schedule_timeout+0x255/0x490
wait_for_completion+0x103/0x170
cpuhp_issue_call+0xb9/0xe0
__cpuhp_setup_state+0xf6/0x180
coretemp_init+0x8d/0x1000 [coretemp]
do_one_initcall+0x3e/0x170
do_init_module+0x5a/0x1ed
load_module+0x2339/0x2a40
SYSC_finit_module+0xbc/0xf0
SyS_finit_module+0x9/0x10
do_syscall_64+0x57/0x140
entry_SYSCALL64_slow_path+0x25/0x25
Showing all locks held in the system:
2 locks held by khungtaskd/91:
#0: (rcu_read_lock){......}, at: [<ffffffff8111a6f0>] watchdog+0xa0/0x5d0
#1: (tasklist_lock){.+.?..}, at: [<ffffffff810bf36d>]
debug_show_all_locks+0x3d/0x1a0
1 lock held by systemd-udevd/748:
#0: (cpu_hotplug.dep_map){++++++}, at: [<ffffffff8106712d>]
get_online_cpus+0x2d/0x80
The call trace below appeared because I ran echo w > /proc/sysrq-trigger to
check whether any kernel thread hung:
sysrq: SysRq : Show Blocked State
task PC stack pid father
systemd-udevd D 0 738 505 0x00000104
Call Trace:
__schedule+0x302/0xc30
schedule+0x38/0x90
schedule_timeout+0x255/0x490
wait_for_completion+0x103/0x170
cpuhp_issue_call+0xb9/0xe0
__cpuhp_setup_state+0xf6/0x180
kvm_timer_init+0x52/0xd0 [kvm]
kvm_arch_init+0xd2/0x180 [kvm]
kvm_init+0x1d/0x2b0 [kvm]
vmx_init+0x21/0x628 [kvm_intel]
do_one_initcall+0x3e/0x170
do_init_module+0x5a/0x1ed
load_module+0x2339/0x2a40
SYSC_finit_module+0xbc/0xf0
SyS_finit_module+0x9/0x10
do_syscall_64+0x57/0x140
entry_SYSCALL64_slow_path+0x25/0x25
Bart.
