Thanks, I'm going to have to ponder a little bit. In the meantime can you apply this: https://people.freebsd.org/~mjg/maxvnodes.diff Once you boot, tweak maxvnodes: sysctl kern.maxvnodes=1049226 Run poudriere. Once it finishes, inspect sysctl vfs.highest_numvnodes On 3/17/21, Yamagi <lists_at_yamagi.org> wrote: > Hi Mateusz, > the sysctl output after about 10 minutes into the problem is attached. > In case that its stripped by Mailman a copy can be found here: > https://deponie.yamagi.org/temp/sysctl_vlruwk.txt.xz > > Regards, > Yamagi > > On Wed, 17 Mar 2021 15:57:59 +0100 > Mateusz Guzik <mjguzik_at_gmail.com> wrote: > >> Can you reproduce the problem and run obtain "sysctl -a"? >> >> In general, there is a vnode limit which is probably too small. The >> reclamation mechanism is deficient in that it will eventually inject >> an arbitrary pause. >> >> On 3/17/21, Yamagi <lists_at_yamagi.org> wrote: >> > Hi, >> > me and some other users in the ##bsdforen.de IRC channel have the >> > problem that during Poudriere runs processes getting stuck in the >> > 'vlruwk' state. >> > >> > For me it's fairly reproduceable. The problems begin about 20 to 25 >> > minutes after I've started poudriere. At first only some ccache >> > processes hang in the 'vlruwk' state, after another 2 to 3 minutes >> > nearly everything hangs and the total CPU load drops to about 5%. >> > When I stop poudriere with ctrl-c it takes another 3 to 5 minutes >> > until the system recovers. >> > >> > First the setup: >> > * poudriere runs in a bhyve vm on zvol. The host is a 12.2-RELEASE-p2. >> > The zvol has a 8k blocksize, the guests partition are aligned to 8k. >> > The guest has only zpool, the pool was created with ashift=13. The >> > vm has 16 E5-2620 and 16 gigabytes RAM assigned to it. >> > * poudriere is configured with ccache and ALLOW_MAKE_JOBS=yes. Removing >> > either of these options lowers the probability of the problem to show >> > up significantly. >> > >> > I've tried several git revisions starting with 14-CURRENT at >> > 54ac6f721efccdba5a09aa9f38be0a1c4ef6cf14 in the hope that I can find at >> > least one known to be good revision. No chance, even a kernel build >> > from 0932ee9fa0d82b2998993b649f9fa4cc95ba77d6 (Wed Sep 2 19:18:27 2020 >> > +0000) has the problem. The problem isn't reproduceable with >> > 12.2-RELEASE. >> > >> > The kernel stack ('procstat -kk') of a hanging process is: >> > mi_switch+0x155 sleepq_switch+0x109 sleepq_catch_signals+0x3f1 >> > sleepq_wait_sig+0x9 _sleep+0x2aa kern_wait6+0x482 sys_wait4+0x7d >> > amd64_syscall+0x140 fast_syscall_common+0xf8 >> > >> > The kernel stack of vnlru is changing, even while the processes are >> > hanging: >> > * mi_switch+0x155 sleepq_switch+0x109 sleepq_timedwait+0x4b >> > _sleep+0x29b vnlru_proc+0xa05 fork_exit+0x80 fork_trampoline+0xe >> > * fork_exit+0x80 fork_trampoline+0xe >> > >> > Since vnlru is accumulating CPU time it looks like it's doing at least >> > something. As an educated guess I would say that vn_alloc_hard() is >> > waiting a long time or even forever to allocate new vnodes. >> > >> > I can provide more information, I just need to know what. >> > >> > >> > Regards, >> > Yamagi >> > >> > -- >> > Homepage: https://www.yamagi.org >> > Github: https://github.com/yamagi >> > GPG: 0x1D502515 >> > >> >> >> -- >> Mateusz Guzik <mjguzik gmail.com> > > > -- > Homepage: https://www.yamagi.org > Github: https://github.com/yamagi > GPG: 0x1D502515 > -- Mateusz Guzik <mjguzik gmail.com>Received on Wed Mar 17 2021 - 16:55:46 UTC
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