| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com>, Mark Wong <mark(at)2ndquadrant(dot)com>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: stress test for parallel workers |
| Date: | 2020-07-28 01:35:45 |
| Message-ID: | CA+hUKG+GJGNH7FP99asatmyf_mbM+nn-M6HHEio5nZwwEOrFVA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Dec 11, 2019 at 3:22 PM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
> On Tue, Oct 15, 2019 at 4:50 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> > > Filed at
> > > https://bugzilla.kernel.org/show_bug.cgi?id=205183
>
> For the curious-and-not-subscribed, there's now a kernel patch
> proposed for this. We guessed pretty close, but the problem wasn't
> those dodgy looking magic numbers, it was that the bad stack expansion
> check only allows for user space to expand the stack
> (FAULT_FLAG_USER), and here the kernel itself wants to build a stack
> frame.
Hehe, the dodgy looking magic numbers *were* wrong:
- * The kernel signal delivery code writes up to about 1.5kB
+ * The kernel signal delivery code writes a bit over 4KB
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