Date: Fri, 15 Jul 2022 18:32:21 -0400 From: Mark Johnston <markj@freebsd.org> To: Larry Rosenman <ler@lerctr.org> Cc: Freebsd current <freebsd-current@freebsd.org> Subject: Re: limits.conf/stacksize doesn't seem to work? Message-ID: <YtHq9bT3jJSlT6jW@nuc> In-Reply-To: <51ef4fe0c8c5bbe251d3e75084847a6e@lerctr.org> References: <d997dadc5e1b09fa6af0419f6641ed7f@lerctr.org> <YtHnsCfIwe%2BK6RMF@nuc> <32dc6f5b56a749f9b8e26330f9f2e8e0@lerctr.org> <YtHpJEzN7OHmvle4@nuc> <51ef4fe0c8c5bbe251d3e75084847a6e@lerctr.org>
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On Fri, Jul 15, 2022 at 05:26:09PM -0500, Larry Rosenman wrote: > On 07/15/2022 5:24 pm, Mark Johnston wrote: > > On Fri, Jul 15, 2022 at 05:21:27PM -0500, Larry Rosenman wrote: > >> On 07/15/2022 5:18 pm, Mark Johnston wrote: > >> > On Fri, Jul 15, 2022 at 05:04:18PM -0500, Larry Rosenman wrote: > >> >> I'm using the following kernel config: > >> >> [...] > >> >> and the following login.conf: > >> >> [...] > >> >> bacula_dir:\ > >> >> :stacksize-max=68719476736:\ > >> >> :stacksize-cur=68719476736:\ > >> >> :tc=daemon: > >> >> [...] > >> >> I've updated my (ler) password entry to reference bacula_dir: > >> >> ler:<elided>:1001:1001:bacula_dir:0:0:Larry > >> >> Rosenman:/home/ler:/usr/local/bin/zsh > >> >> > >> >> > >> >> when I ssh in, the stacklimit is still: > >> >> โฏ ulimit -H -s > >> >> 2097152 > >> > > >> > What is the value of the kern.maxssiz sysctl on this system? > >> > > >> >> ler in ๐ borg in sys/amd64/conf๐ on ๎ ler/freebsd-main-changes:main on > >> >> โ๏ธ (us-east-1) > >> >> โฏ ulimit -S -s > >> >> 2097152 > >> >> > >> >> ler in ๐ borg in sys/amd64/conf๐ on ๎ ler/freebsd-main-changes:main on > >> >> โ๏ธ (us-east-1) > >> >> โฏ > >> >> > >> >> Where does this number come from? What am I missing here? > >> > > >> > The stack limit cannot be set to an arbitrarily large number. It will > >> > silently be clamped to maxssiz. > >> > >> โฏ sysctl kern.maxssiz > >> kern.maxssiz: 2147483648 > > > > Then what you're seeing is expected. The kernel is clamping the stack > > segment limit to 2GB. > > I assume this is the default for MAXSSIZ? and if I change that in the > kernel config, it will > allow bigger? Where is this default defined? The default value is platform dependent. On amd64 it's 512MB, so I'm not sure where your value is coming from. It's defined in a header. You can set it in the kernel configuration, or as a tunable or sysctl.
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