The customer's application hangs on the following poll:

/3: poll(0xEF005AC0, 0, 10) = 0
/6: lwp_mutex_unlock(0xEF78B280) = 0
/3: poll(0xEF005AC0, 0, 10) = 0
/6: setitimer(ITIMER_REAL, 0xEF109788, 0x00000000) = 0
/6: sigprocmask(SIG_SETMASK, 0xEF790AA0, 0x00000000) = 0
/4: lwp_mutex_unlock(0xEF78B280) = 0
/6: lwp_mutex_lock(0xEF78B280) = 0
/6: setcontext(0xEF109720)
/6: sigprocmask(SIG_BLOCK, 0xEF788580, 0x00000000) = 0
/6: setitimer(ITIMER_REAL, 0xEF109CC8, 0x00000000) = 0
/6: sigprocmask(SIG_UNBLOCK, 0xEF788580, 0x00000000) = 0
/3: poll(0xEF005AC0, 0, 10) = 0
/4: lwp_sema_post(0xEF788590) = 0
/6: lwp_sema_wait(0xEF788590) = 0
/6: sigprocmask(SIG_BLOCK, 0xEF788580, 0x00000000) = 0
/6: setitimer(ITIMER_REAL, 0xEF109CC8, 0x00000000) = 0
/6: sigprocmask(SIG_UNBLOCK, 0xEF788580, 0x00000000) = 0
/3: poll(0xEF005AC0, 0, 10) = 0
/3: poll(0xEF005AC0, 0, 10) = 0
/3: poll(0xEF005AC0, 0, 10) = 0
/3: poll(0xEF005AC0, 0, 10) = 0
/3: poll(0xEF005AC0, 0, 10) = 0


Looking through the logs lwp#81 ----------

lwp#3 ----------
 ef6b8148 poll (ef005ac0, 0, a)
 ef6ced40 select (ef005ac0, ef7287ac, ef7287ac, 0, 0, 0) + 318
 ee4f448c __1cIos_sleep6Fx_i_ (0, a, 7fffffff, 0, 0, a) + c4
 ee4f42c8 __1cCosFsleep6FpnGThread_xl_i_ (de468, a, ee8a2000, 0, 0, de468) + 1a0
 ee6dc060 __1cNWatcherThreadDrun6M_v_ (de468, ee8b9eac, 0, ee8a2000, de468, 0) + 7c
 ee611f54 _start (ee8a2000, ef675d70, 0, ef790ac4, 1, fe401000) + 20
 ef7764bc _thread_start (de468, 0, 0, 0, 0, 0) + 40
lwp#4 ----------
 ef6ba4d0 lwp_sema_p (ef20be78)
 ef6ba4d0 __lwp_sema_wait (ef20be78, 0, 0, ef7909d4, ff00, ff) + 8
 ef767e98 _park (ef20bdd0, ef20be78, 0, ef20be50, ef20be4c, ef20be48) + 10c
 ef7664f0 _cond_timedwait_cancel (29ea8, 29e90, ef20bc00, ef20bdd0, ef786b70, 0) + 1e4
 ee55704c __1cHMonitorEwait6Mll_l_ (29e60, 1, 3e8, 2faf080, 0, 3e8) + 2f0
 ee6d0994 __1cIVMThreadEloop6M_v_ (db5a0, ee8ad014, 8, ee8bebb4, ee8beba8, ee8bebb8) + 118
 ee6d04f0 __1cIVMThreadDrun6M_v_ (ee8a2000, db5a0, 0, 0, 0, 0) + 7c
 ee611f54 _start (ee8a2000, 0, 1, ef7882c0, 1, ef786b70) + 20
 ef7764bc _thread_start (db5a0, 0, 0, 0, 0, 0) + 40
lwp#6 ----------
 ef6ba4d0 lwp_sema_p (ef788590)
 ef6ba4d0 __lwp_sema_wait (ef788590, 71f3adf8, 0, ef109d44, 0, ef109d38) + 8
 ef7672b8 _co_timerset (ef788580, ef787b18, ef786b70, ef7882c0, 3, ef786b70) + f4
 ef7764bc _thread_start (0, 0, 0, 0, 0, 0) + 40