strace of one of the high CPU utilization threads:
--- SIGPWR (Power failure) @ 0 (0) ---
rt_sigprocmask(SIG_BLOCK, [XCPU], NULL, 8) = 0
futex(0x22ab38, FUTEX_WAKE_PRIVATE, 1) = 1
rt_sigsuspend(~[XCPU RTMIN RT_1]) = ? ERESTARTNOHAND (To be restarted)
--- SIGXCPU (CPU time limit exceeded) @ 0 (0) ---
rt_sigreturn(0x1b7f110) = -1 EINTR (Interrupted system call)
rt_sigprocmask(SIG_UNBLOCK, [XCPU], NULL, 8) = 0
futex(0x22ab38, FUTEX_WAKE_PRIVATE, 1) = 1
rt_sigreturn(0x76cef54c) = 1
--- SIGPWR (Power failure) @ 0 (0) ---
rt_sigprocmask(SIG_BLOCK, [XCPU], NULL, 8) = 0
rt_sigsuspend(~[XCPU RTMIN RT_1]) = ? ERESTARTNOHAND (To be restarted)
--- SIGXCPU (CPU time limit exceeded) @ 0 (0) ---
rt_sigreturn(0x1b7f110) = -1 EINTR (Interrupted system call)
rt_sigprocmask(SIG_UNBLOCK, [XCPU], NULL, 8) = 0
rt_sigreturn(0x76cef54c) = 1991784768
--- SIGPWR (Power failure) @ 0 (0) ---
rt_sigprocmask(SIG_BLOCK, [XCPU], NULL, 8) = 0
futex(0x22ab38, FUTEX_WAKE_PRIVATE, 1) = 1
rt_sigsuspend(~[XCPU RTMIN RT_1]) = ? ERESTARTNOHAND (To be restarted)
--- SIGXCPU (CPU time limit exceeded) @ 0 (0) ---
rt_sigreturn(0x1b7f110) = -1 EINTR (Interrupted system call)
rt_sigprocmask(SIG_UNBLOCK, [XCPU], NULL, 8) = 0
rt_sigreturn(0x76cef54c) = 1992999216
--- SIGPWR (Power failure) @ 0 (0) ---
rt_sigprocmask(SIG_BLOCK, [XCPU], NULL, 8) = 0
futex(0x22ab38, FUTEX_WAKE_PRIVATE, 1) = 1
rt_sigsuspend(~[XCPU RTMIN RT_1]) = ? ERESTARTNOHAND (To be restarted)
--- SIGXCPU (CPU time limit exceeded) @ 0 (0) ---
rt_sigreturn(0x1b7f110) = -1 EINTR (Interrupted system call)
rt_sigprocmask(SIG_UNBLOCK, [XCPU], NULL, 8) = 0
rt_sigreturn(0x76cef54c) = 1992999216