Hi. I've got NMI on an almost idle system - FreeBSD 7.2-R amd64. I guess the reason may be in (hardware?) binary garbage seen once in a while on serial port (loader, then ttyd0). Ask me for more details.
Tracing command swi4: clock sio pid 20 tid 100011 td 0xffffff000144e370 cpustop_handler() at cpustop_handler+64 ipi_nmi_handler() at ipi_nmi_handler+48 trap() at trap+796 nmi_calltrap() at nmi_calltrap+8 --- trap 19, rip = 18446744071567390785, rsp = 18446744067267268592, rbp = 18446744067267558272 --- _mtx_lock_spin() at _mtx_lock_spin+113 siopoll() at siopoll+206 ithread_loop() at ithread_loop+384 fork_exit() at fork_exit+287 fork_trampoline() at fork_trampoline+14 --- trap 0, rip = 0, rsp = 18446744067267558704, rbp = 0 --- (kgdb) thr 13 [Switching to thread 13 (Thread 100011)]#0 cpustop_handler () at atomic.h:264 264 atomic.h: No such file or directory. in atomic.h (kgdb) bt #0 cpustop_handler () at atomic.h:264 #1 0xffffffff807ec400 in ipi_nmi_handler () at /usr/src/sys/amd64/amd64/mp_machdep.c:1144 #2 0xffffffff807fceec in trap (frame=0xfffffffe80028f40) at /usr/src/sys/amd64/amd64/trap.c:198 #3 0xffffffff807e0aeb in nmi_calltrap () at /usr/src/sys/amd64/amd64/exception.S:427 #4 0xffffffff80513841 in _mtx_lock_spin (m=0xffffffff80bb3d00, tid=18446742974219215728, opts=Variable "opts" is not available. ) at /usr/src/sys/kern/kern_mutex.c:474 #5 0xffffffff8082b96e in siopoll (dummy=Variable "dummy" is not available. ) at /usr/src/sys/dev/sio/sio.c:1703 #6 0xffffffff804ff940 in ithread_loop (arg=0xffffff000142bac0) at /usr/src/sys/kern/kern_intr.c:1088 #7 0xffffffff804fc1df in fork_exit ( callout=0xffffffff804ff7c0 <ithread_loop>, arg=0xffffff000142bac0, frame=0xfffffffe8006fc80) at /usr/src/sys/kern/kern_fork.c:834 #8 0xffffffff807e0b5e in fork_trampoline () at /usr/src/sys/amd64/amd64/exception.S:455 #9 0x0000000000000000 in ?? () #10 0x0000000000000000 in ?? () #11 0x0000000000000001 in ?? () #12 0x0000000000000000 in ?? () #13 0x0000000000000000 in ?? () #14 0x0000000000000000 in ?? () ---Type <return> to continue, or q <return> to quit---q Quit (kgdb) f 5 #5 0xffffffff8082b96e in siopoll (dummy=Variable "dummy" is not available. ) at /usr/src/sys/dev/sio/sio.c:1703 1703 mtx_lock_spin(&sio_lock); (kgdb) i loc _tid = Variable "_tid" is not available. (kgdb) list 1698 com_events -= incc; 1699 mtx_unlock_spin(&sio_lock); 1700 continue; 1701 } 1702 if (com->iptr != com->ibuf) { 1703 mtx_lock_spin(&sio_lock); 1704 sioinput(com); 1705 mtx_unlock_spin(&sio_lock); 1706 } 1707 if (com->state & CS_CHECKMSR) { (kgdb) p sio_lock $1 = {lock_object = {lo_name = 0xffffffff80b15380 "sio", lo_type = 0xffffffff80b15380 "sio", lo_flags = 458752, lo_witness_data = { lod_list = {stqe_next = 0x0}, lod_witness = 0x0}}, mtx_lock = 18446742974219094608, mtx_recurse = 0} (kgdb) p/x sio_lock->mtx_lock $10 = 0xffffff0001430a50 # == td for pid 17 tid 100008 Binary garbage is like below (not touching anything on k/board atm). login: FreeBSD/amd64 (ho FreeBSD/amd64 (host) (ttyd0) login: <<|Ч FreeBSD FreeBSD FreeBS FreeBSD Free FreeBSD/amd64 (host) (ttyd0) login: FreeBSD/amd64 (host) (ttyd0) login: FreeBSD Free FreeBS FreeBSD FreeBS FreeBSD FreeBSD FreeBS FreeBSD FreeBS FreeBSD FreeBSD FreeBS FreeBSD FreeBS═╗Hхи M5 FreeBSD FreeBS FreeBSD FreeBSD FreeBS FreeBSD FreeBS═╗Hхи M5 FreeBSD FreeBS FreeBSD FreeB FreeBSD/amd6 FreeBS FreeBS FreeBSD FreeBSD FreeBS FreeBSD FreeBS FreeBSD FreeBSD FreeBS FreeBSD FreeBS═╗Hхи M5 FreeBSD FreeBS FreeBSD [..a little later..] [r...@host ~]# <<<<<<<<<<<><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<8<<<<<8<<<< <<<<<<<<<<<<<<<<<<<<<<<<<<<<<8<<<<<<<>< Other useful stuff. (kgdb) f 4 #4 0xffffffff80513841 in _mtx_lock_spin (m=0xffffffff80bb3d00, tid=18446742974219215728, opts=Variable "opts" is not available. ) at /usr/src/sys/kern/kern_mutex.c:474 474 while (m->mtx_lock != MTX_UNOWNED) { (kgdb) list 469 lock_profile_obtain_lock_failed(&m->lock_object, &contested, &waittime); 470 while (!_obtain_lock(m, tid)) { 471 472 /* Give interrupts a chance while we spin. */ 473 spinlock_exit(); 474 while (m->mtx_lock != MTX_UNOWNED) { 475 if (i++ < 10000000) { 476 cpu_spinwait(); 477 continue; 478 } (kgdb) f 3 #3 0xffffffff807e0aeb in nmi_calltrap () at /usr/src/sys/amd64/amd64/exception.S:427 427 call trap Current language: auto; currently asm (kgdb) list 422 swapgs 423 /* Note: this label is also used by ddb and gdb: */ 424 nmi_calltrap: 425 FAKE_MCOUNT(TF_RIP(%rsp)) 426 movq %rsp, %rdi 427 call trap 428 MEXITCOUNT 429 testl %ebx,%ebx 430 jz nmi_restoreregs 431 swapgs (kgdb) f 2 #2 0xffffffff807fceec in trap (frame=0xfffffffe80028f40) at /usr/src/sys/amd64/amd64/trap.c:198 198 if (ipi_nmi_handler() == 0) Current language: auto; currently c (kgdb) list 193 194 #ifdef SMP 195 #ifdef STOP_NMI 196 /* Handler for NMI IPIs used for stopping CPUs. */ 197 if (type == T_NMI) { 198 if (ipi_nmi_handler() == 0) 199 goto out; 200 } 201 #endif /* STOP_NMI */ 202 #endif /* SMP */ db> bt Tracing pid 17 tid 100008 td 0xffffff0001430a50 kdb_enter_why() at kdb_enter_why+0x3d siointr1() at siointr1+0x2c5 siointr() at siointr+0x58 intr_execute_handlers() at intr_execute_handlers+0x8b Xapic_isr1() at Xapic_isr1+0x7f --- interrupt, rip = 0xffffffff807d8bd6, rsp = 0xfffffffe8005fb90, rbp = 0xfffffffe8005fba0 --- acpi_cpu_c1() at acpi_cpu_c1+0x6 acpi_cpu_idle() at acpi_cpu_idle+0x19c sched_idletd() at sched_idletd+0x46 fork_exit() at fork_exit+0x11f fork_trampoline() at fork_trampoline+0xe --- trap 0, rip = 0, rsp = 0xfffffffe8005fd30, rbp = 0 --- (kgdb) p (struct thread) *sio_lock->mtx_lock $15 = {td_lock = 0xffffffff80b7bc40, td_proc = 0xffffff000142e478, td_plist = { tqe_next = 0x0, tqe_prev = 0xffffff000142e488}, td_slpq = {tqe_next = 0x0, tqe_prev = 0x0}, td_lockq = {tqe_next = 0x0, tqe_prev = 0x0}, td_selq = { tqh_first = 0x0, tqh_last = 0x0}, td_sleepqueue = 0xffffff0001418c00, td_turnstile = 0xffffff00012f9a00, td_umtxq = 0xffffff000142a380, td_tid = 100008, td_sigqueue = {sq_signals = {__bits = {0, 0, 0, 0}}, sq_kill = {__bits = {0, 0, 0, 0}}, sq_list = {tqh_first = 0x0, tqh_last = 0xffffff0001430ae0}, sq_proc = 0xffffff000142e478, sq_flags = 1}, td_flags = 65572, td_inhibitors = 0, td_pflags = 0, td_dupfd = 0, td_sqqueue = 0, td_wchan = 0x0, td_wmesg = 0x0, td_lastcpu = 1 '\001', td_oncpu = 1 '\001', td_owepreempt = 0 '\0', td_locks = 0, td_tsqueue = 0 '\0', td_blocked = 0x0, td_lockname = 0x0, td_contested = {lh_first = 0x0}, td_sleeplocks = 0x0, td_intr_nesting_level = 1, td_pinned = 0, td_mailbox = 0x0, td_ucred = 0xffffff0001300e00, td_standin = 0x0, td_upcall = 0x0, td_estcpu = 0, td_slptick = 0, td_ru = {ru_utime = {tv_sec = 0, tv_usec = 0}, ru_stime = {tv_sec = 0, tv_usec = 0}, ru_maxrss = 0, ru_ixrss = 0, ru_idrss = 0, ru_isrss = 0, ru_minflt = 0, ru_majflt = 0, ru_nswap = 0, ru_inblock = 0, ru_oublock = 0, ru_msgsnd = 0, ru_msgrcv = 0, ru_nsignals = 0, ru_nvcsw = 6414, ru_nivcsw = 38607927}, td_runtime = 2179322361251400, td_pticks = 145105307, td_sticks = 7704049, td_iticks = 0, td_uticks = 0, td_uuticks = 0, td_usticks = 0, td_intrval = 0, td_oldsigmask = {__bits = {0, 0, 0, 0}}, td_sigmask = { ---Type <return> to continue, or q <return> to quit--- __bits = {0, 0, 0, 0}}, td_generation = 38614341, td_sigstk = { ss_sp = 0x0, ss_size = 0, ss_flags = 0}, td_kflags = 0, td_xsig = 0, td_profil_addr = 0, td_profil_ticks = 0, td_name = '\0' <repeats 19 times>, td_base_pri = 255 'Ъ', td_priority = 255 'Ъ', td_pri_class = 4 '\004', td_user_pri = 180 '╢', td_base_user_pri = 180 '╢', td_pcb = 0xfffffffe8005fd40, td_state = TDS_RUNNING, td_retval = {0, 0}, td_slpcallout = {c_links = {sle = {sle_next = 0x0}, tqe = {tqe_next = 0x0, tqe_prev = 0x0}}, c_time = 0, c_arg = 0x0, c_func = 0, c_mtx = 0x0, c_flags = 16}, td_frame = 0xfffffffe8005fc80, td_kstack_obj = 0xffffff0001431740, td_kstack = 18446744067267477504, td_kstack_pages = 4, td_altkstack_obj = 0x0, td_altkstack = 0, td_altkstack_pages = 0, td_critnest = 2, td_md = {md_spinlock_count = 1, md_saved_flags = 70}, td_sched = 0xffffff0001430d80, td_ar = 0x0, td_syscalls = 0, td_incruntime = 115662355444194, td_cpuset = 0xffffff0001424dc8, td_fpop = 0x0, td_dtrace = 0x0, td_errno = 0} (kgdb) p (struct proc) *0xffffff000142e478 $16 = {p_list = {le_next = 0xffffff000142e8f0, le_prev = 0xffffff00014458f0}, p_threads = {tqh_first = 0xffffff0001430a50, tqh_last = 0xffffff0001430a60}, p_upcalls = {tqh_first = 0x0, tqh_last = 0xffffff000142e498}, p_slock = { lock_object = {lo_name = 0xffffffff808da2a3 "process slock", lo_type = 0xffffffff808da2a3 "process slock", lo_flags = 720896, lo_witness_data = {lod_list = {stqe_next = 0x0}, lod_witness = 0x0}}, mtx_lock = 4, mtx_recurse = 0}, p_ucred = 0xffffff0001300e00, p_fd = 0xffffff0001443400, p_fdtol = 0x0, p_stats = 0xffffff00012ff600, p_limit = 0xffffff0001300c00, p_limco = {c_links = {sle = {sle_next = 0x0}, tqe = {tqe_next = 0x0, tqe_prev = 0x0}}, c_time = 0, c_arg = 0x0, c_func = 0, c_mtx = 0xffffff000142e590, c_flags = 0}, p_sigacts = 0xffffff000143e000, p_flag = 268435980, p_state = PRS_NORMAL, p_pid = 17, p_hash = {le_next = 0x0, le_prev = 0xfffffffe8021c088}, p_pglist = {le_next = 0xffffff000142e8f0, le_prev = 0xffffff00014459d8}, p_pptr = 0xffffffff80b64640, p_sibling = {le_next = 0xffffff000142e8f0, le_prev = 0xffffff00014459f0}, p_children = {lh_first = 0x0}, p_mtx = { lock_object = {lo_name = 0xffffffff808da296 "process lock", lo_type = 0xffffffff808da296 "process lock", lo_flags = 21168128, lo_witness_data = {lod_list = {stqe_next = 0x0}, lod_witness = 0x0}}, mtx_lock = 4, mtx_recurse = 0}, p_ksi = 0x0, p_sigqueue = {sq_signals = { __bits = {0, 0, 0, 0}}, sq_kill = {__bits = {0, 0, 0, 0}}, sq_list = { tqh_first = 0x0, tqh_last = 0xffffff000142e5e8}, sq_proc = 0xffffff000142e478, sq_flags = 1}, p_oppid = 0, ---Type <return> to continue, or q <return> to quit--- p_vmspace = 0xffffffff80b64e00, p_swtick = 0, p_realtimer = {it_interval = { tv_sec = 0, tv_usec = 0}, it_value = {tv_sec = 0, tv_usec = 0}}, p_ru = { ru_utime = {tv_sec = 0, tv_usec = 0}, ru_stime = {tv_sec = 0, tv_usec = 0}, ru_maxrss = 0, ru_ixrss = 0, ru_idrss = 0, ru_isrss = 0, ru_minflt = 0, ru_majflt = 0, ru_nswap = 0, ru_inblock = 0, ru_oublock = 0, ru_msgsnd = 0, ru_msgrcv = 0, ru_nsignals = 0, ru_nvcsw = 0, ru_nivcsw = 0}, p_rux = {rux_runtime = 2063660005807206, rux_uticks = 0, rux_sticks = 137401258, rux_iticks = 0, rux_uu = 0, rux_su = 371936150861, rux_tu = 1034416043011}, p_crux = {rux_runtime = 0, rux_uticks = 0, rux_sticks = 0, rux_iticks = 0, rux_uu = 0, rux_su = 0, rux_tu = 0}, p_profthreads = 0, p_exitthreads = 0, p_traceflag = 0, p_tracevp = 0x0, p_tracecred = 0x0, p_textvp = 0x0, p_lock = 0 '\0', p_sigiolst = {slh_first = 0x0}, p_sigparent = 20, p_sig = 0, p_code = 0, p_stops = 0, p_stype = 0, p_step = 0 '\0', p_pfsflags = 0 '\0', p_nlminfo = 0x0, p_aioinfo = 0x0, p_singlethread = 0x0, p_suspcount = 0, p_xthread = 0x0, p_boundary_count = 0, p_pendingcnt = 0, p_itimers = 0x0, p_numupcalls = 0, p_upsleeps = 0, p_completed = 0x0, p_nextupcall = 0, p_upquantum = 0, p_magic = 3203398350, p_osrel = 702000, p_comm = "idle: cpu1\000\000\000\000\000\000\000\000\000", p_pgrp = 0xffffffff80b65060, p_sysent = 0xffffffff80ad4d80, p_args = 0x0, p_cpulimit = 9223372036854775807, p_nice = 0 '\0', p_fibnum = 0, p_xstat = 0, p_klist = {kl_list = {slh_first = 0x0}, kl_lock = 0xffffffff804f65d0 <knlist_mtx_lock>, ---Type <return> to continue, or q <return> to quit--- kl_unlock = 0xffffffff804f5ff0 <knlist_mtx_unlock>, kl_locked = 0xffffffff804f5fd0 <knlist_mtx_locked>, kl_lockarg = 0xffffff000142e590}, p_numthreads = 1, p_md = <incomplete type>, p_itcallout = {c_links = {sle = {sle_next = 0x0}, tqe = {tqe_next = 0x0, tqe_prev = 0x0}}, c_time = 0, c_arg = 0x0, c_func = 0, c_mtx = 0x0, c_flags = 16}, p_acflag = 1, p_peers = 0x0, p_leader = 0xffffff000142e478, p_emuldata = 0x0, p_label = 0x0, p_sched = 0xffffff000142e8f0, p_ktr = {stqh_first = 0x0, stqh_last = 0xffffff000142e8d0}, p_mqnotifier = {lh_first = 0x0}, p_dtrace = 0x0} db> show allpcpu Current CPU: 1 cpuid = 0 curthread = 0xffffff00014306e0: pid 18 "idle: cpu0" curpcb = 0xfffffffe80064d40 fpcurthread = none idlethread = 0xffffff00014306e0: pid 18 "idle: cpu0" cpuid = 1 curthread = 0xffffff0001430a50: pid 17 "idle: cpu1" curpcb = 0xfffffffe8005fd40 fpcurthread = none idlethread = 0xffffff0001430a50: pid 17 "idle: cpu1" cpuid = 2 curthread = 0xffffff000143c000: pid 16 "idle: cpu2" curpcb = 0xfffffffe8005ad40 fpcurthread = none idlethread = 0xffffff000143c000: pid 16 "idle: cpu2" cpuid = 3 curthread = 0xffffff000143c370: pid 15 "idle: cpu3" curpcb = 0xfffffffe80055d40 fpcurthread = none idlethread = 0xffffff000143c370: pid 15 "idle: cpu3" cpuid = 4 curthread = 0xffffff000143c6e0: pid 14 "idle: cpu4" curpcb = 0xfffffffe80050d40 fpcurthread = none idlethread = 0xffffff000143c6e0: pid 14 "idle: cpu4" cpuid = 5 curthread = 0xffffff000144e370: pid 20 "swi4: clock sio" curpcb = 0xfffffffe8006fd40 fpcurthread = none idlethread = 0xffffff000142f000: pid 13 "idle: cpu5" cpuid = 6 curthread = 0xffffff000142f370: pid 12 "idle: cpu6" curpcb = 0xfffffffe80046d40 fpcurthread = none idlethread = 0xffffff000142f370: pid 12 "idle: cpu6" cpuid = 7 curthread = 0xffffff000142f6e0: pid 11 "idle: cpu7" curpcb = 0xfffffffe80041d40 fpcurthread = none idlethread = 0xffffff000142f6e0: pid 11 "idle: cpu7" -- wbr, pluknet _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"