Date: Thu, 18 Nov 2021 15:11:45 -0800 From: Mark Millard via freebsd-current <freebsd-current@freebsd.org> To: "tuexen@freebsd.org" <tuexen@FreeBSD.org> Cc: freebsd-current <freebsd-current@freebsd.org> Subject: Re: "Khelp module "ertt" can't unload until its refcount drops from 1 to 0." after "All buffers synced."? Message-ID: <E76BD6F5-2170-4E98-B407-7646CF456828@yahoo.com> In-Reply-To: <52374B7E-6ABB-4E55-984C-B7EC82B48506@freebsd.org> References: <119DC979-EC2C-4BE4-A6E8-2DBF222115A0.ref@yahoo.com> <119DC979-EC2C-4BE4-A6E8-2DBF222115A0@yahoo.com> <52374B7E-6ABB-4E55-984C-B7EC82B48506@freebsd.org>
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> On 2021-Nov-18, at 12:31, tuexen@freebsd.org <tuexen@FreeBSD.org> = wrote: >=20 >> On 17. Nov 2021, at 21:13, Mark Millard via freebsd-current = <freebsd-current@freebsd.org> wrote: >>=20 >> I've not noticed the ertt message before in: >>=20 >> . . . >> Waiting (max 60 seconds) for system thread `bufspacedaemon-1' to = stop... done >> All buffers synced. >> Uptime: 1d9h57m18s >> Khelp module "ertt" can't unload until its refcount drops from 1 to = 0. > Hi Mark, >=20 > what kernel configuration are you using? What kernel modules are = loaded? The shutdown was of my ZFS boot media but the machine is currently doing builds on the UFS media. (The ZFS media is present but not mounted). For now I provide information from the booted UFS system. The UFS context is intended to be nearly a copy of the brctl selection for main [so: 14] from the ZFS media. Both systems have been doing the same poudriere builds for various comparison/contrast purposes. The current build activity will likely take 16+ hrs. For reference for now (from UFS context): # uname -apKU FreeBSD HC_CA72_UFS 14.0-CURRENT FreeBSD 14.0-CURRENT #19 = main-n250667-20aa359773be-dirty: Sun Nov 14 02:57:32 PST 2021 = root@CA72_16Gp_ZFS:/usr/obj/BUILDs/main-CA72-nodbg-clang/usr/main-src/arm6= 4.aarch64/sys/GENERIC-NODBG-CA72 arm64 aarch64 1400042 1400042 This environment was built with -mcpu=3Dcortex-a72 in use and the system is a 16 core Cortex-A72 system. (I've caught a FreeBSD weak memory model error in the past with such -mcpu=3Dcortext-a72 use on a Cortext-A72 system, not that I have evidence of such here.) # kldstat Id Refs Address Size Name 1 18 0xffff000000000000 12b1660 kernel 2 1 0xffff0000012b2000 41e070 zfs.ko 3 1 0xffff0000016d1000 26af8 cryptodev.ko 4 1 0xffff00019a400000 27000 nullfs.ko 5 1 0xffff00019a427000 25000 fdescfs.ko # more /usr/main-src/sys/arm64/conf/GENERIC-NODBG-CA72 include "GENERIC-NODBG" ident GENERIC-NODBG-CA72 makeoptions CONF_CFLAGS=3D"-mcpu=3Dcortex-a72" # more /usr/main-src/sys/arm64/conf/GENERIC-NODBG # # GENERIC -- Custom configuration for the arm64/aarch64 # include "GENERIC" ident GENERIC-NODBG makeoptions DEBUG=3D-g # Build kernel with gdb(1) = debug symbols options ALT_BREAK_TO_DEBUGGER options KDB # Enable kernel debugger support # For minimum debugger support (stable branch) use: #options KDB_TRACE # Print a stack trace for a = panic options DDB # Enable the kernel debugger # Extra stuff: #options VERBOSE_SYSINIT=3D0 # Enable verbose sysinit = messages #options BOOTVERBOSE=3D1 #options BOOTHOWTO=3DRB_VERBOSE #options KTR #options KTR_MASK=3DKTR_TRAP ##options KTR_CPUMASK=3D0xF #options KTR_VERBOSE # Disable any extra checking for. . . nooptions DEADLKRES # Enable the deadlock resolver nooptions INVARIANTS # Enable calls of extra sanity = checking nooptions INVARIANT_SUPPORT # Extra sanity checks of = internal structures, required by INVARIANTS nooptions WITNESS # Enable checks to detect = deadlocks and cycles nooptions WITNESS_SKIPSPIN # Don't run witness on spinlocks = for speed nooptions DIAGNOSTIC nooptions MALLOC_DEBUG_MAXZONES # Separate malloc(9) zones nooptions BUF_TRACKING nooptions FULL_BUF_TRACKING The builds do include a bulk for targeting armv7 (so 32-bit compatibility) but that bulk has not started yet in the UFS context. # poudriere jail -jmain-CA7 -i Jail name: main-CA7 Jail version: 14.0-CURRENT Jail arch: arm.armv7 Jail method: null Jail mount: /usr/obj/DESTDIRs/main-CA7-poud Jail fs: =20 Jail updated: 2021-11-16 02:24:57 Jail pkgbase: disabled My networking context is simple context does not provide services outside the local network. The services are normal ones, such as nfs, ssh, and whatever default things. ntpd is in use. distfiles are downloaded during builds. It is not a desktop environment, not even a video card. I've noticed a 2021-Feb-22 report in: = https://forums.freebsd.org/threads/whats-the-error-khelp-module-ertt-unloa= d.79009/ so getting the message does not appear to be unique to my context. =3D=3D=3D Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)
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