Messages in this thread | | | From | Bart Van Assche <> | Subject | Re: [GIT pull] CPU hotplug updates for 4.9 | Date | Thu, 9 Mar 2017 17:20:39 +0000 |
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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.
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