YONETANI Tomokazu wrote:
Was it a complete hang, or stuck for a few minutes? Was that during early in the boot, or sysctl from the command line (either in single- or multi- user mode)? Also, if you were able to drop into DDB, please send me the backtrace, in particular a few function names below (I mean callers of) AcpiOsWaitSemaphore().
It was stuck on bootup (the random thing: seedenable + dd). I did a ^C (after some time) and this was printed: ACPI Exception (exutils-0382): AE_TIME, Could not aquire Global Lock [20061109] acpi_acad0: On Line there were two processes in acsem: acpi_task and sysctl (why sysctl has to aquire the acpi lock is out of my imagination). both seem to try to aquire the global lock. sysctl can happen to run (sleep) on CPU #0 or CPU #1. trace of acpi_task (transcribed): AcpiOsWaitSemaphore(c3bc12f0,1,ffff) AcpiExSystemWaitSemaphore(c3bc12f0,ffff) AcpiEvAcquireGlobalLock(ffff) AcpiExAcquireGlobalLock(10) AcpiExWriteDataToField AcpiExStoreObjectToNode AcpiExStore AcpiExOpcode_1A_1T_1R AcpiDsExecEndOp AcpiPsParseLoop AcpiPsParseAml ApciPsExecuteMethod AcpiNsEvaluate AcpiEvaluateObject acpi_GetInteger acpi_acad_get_status acpi_acad_init_acline acpi_task_thread trace of sysctl: AcpiOsWaitSemaphore(c3bc12d8,1,ffff) AcpiExSystemWaitMutex(c3bc12d8,ffff) AcpiEvAcquireGlobalLock(ffff) AcpiExAcquireGlobalLock(10) AcpiExWriteDataToField AcpiExStoreObjectToNode AcpiExStore AcpiExOpcode_1A_1T_1R AcpiDsExecEndOp AcpiPsParseLoop AcpiPsParseAml AcpiPsExecuteMethod AcpiNsEvaluate AcpiEvaluateObject acpi_GetInteger acpi_acad_get_acline acpi_acad_sysctl sysctl_root userland_sysctl sys___sysctl syscall2 on a (maybe) unrelated matter: I saw your implementation of AcpiOsAcquireLock is not MP-safe (only uses critical sections) and always allows the idle thread to take the lock (even when it is already held before). Is this intended? oh well, i see that AS_LOCK(as) == crit_enter(). Obviously, this doesn't work for SMP systems, no? cheers simon -- Serve - BSD +++ RENT this banner advert +++ ASCII Ribbon /"\ Work - Mac +++ space for low €€€ NOW!1 +++ Campaign \ / Party Enjoy Relax | http://dragonflybsd.org Against HTML \ Dude 2c 2 the max ! http://golden-apple.biz Mail + News / \
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