I just saw a similar issue on Trusty after upgrade to kernel 4.10.2:

Mar 14 22:48:21 roc01r-sca025 kernel: [  244.926873] INFO: task systemd-udevd:1371 blocked for more than 120 seconds.
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.926926]       Not tainted 4.10.2-041002-generic #201703120131
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.926972] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927021] systemd-udevd   D    0  1371   1266 0x00000004
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927025] Call Trace:
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927034]  __schedule+0x233/0x6f0
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927039]  ? enqueue_entity+0x113/0x640
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927041]  schedule+0x36/0x80
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927044]  schedule_timeout+0x22a/0x3f0
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927047]  wait_for_completion+0xb4/0x140
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927049]  ? wake_up_q+0x80/0x80
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927052]  cpuhp_issue_call+0x9e/0xd0
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927053]  __cpuhp_setup_state+0xe3/0x160
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927060]  ? set_floor_freq_default+0x80/0x80 [intel_rapl]
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927061]  ? 0xffffffffc079d000
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927064]  rapl_init+0x9e/0x1000 [intel_rapl]
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927066]  ? 0xffffffffc079d000
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927070]  do_one_initcall+0x52/0x1a0
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927074]  ? kmem_cache_alloc_trace+0x142/0x190
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927078]  do_init_module+0x5f/0x200
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927084]  load_module+0x190b/0x1c70
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927086]  ? __symbol_put+0x60/0x60
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927089]  ? ima_post_read_file+0x7e/0xa0
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927095]  ? security_kernel_post_read_file+0x6b/0x80
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927097]  SYSC_finit_module+0xdf/0x110
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927100]  SyS_finit_module+0xe/0x10
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927104]  entry_SYSCALL_64_fastpath+0x1e/0xad
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927105] RIP: 0033:0x7fe62c321709
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927106] RSP: 002b:00007ffd709ec1f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927109] RAX: ffffffffffffffda RBX: 00000000024c8a80 RCX: 00007fe62c321709
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927110] RDX: 0000000000000000 RSI: 00007fe62d294cf0 RDI: 0000000000000005
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927111] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927112] R10: 0000000000000005 R11: 0000000000000246 R12: 00000000024b3950
Mar 14 22:48:21 roc01r-sca025 kernel: [  244.927113] R13: 00000000024c8a80 R14: 00000000024b43c0 R15: 0000000000020000