Date: Mon, 8 Feb 2021 14:01:59 +0100 From: Hans Petter Selasky <hps@selasky.org> To: Alastair Hogge <agh@riseup.net>, Emmanuel Vadot <manu@bidouilliste.com> Cc: Steve Kargl <sgk@troutmask.apl.washington.edu>, Andriy Gapon <avg@freebsd.org>, freebsd-current@freebsd.org, freebsd-x11@freebsd.org Subject: Re: panic in drm or vt or deadlock on mutex or ... Message-ID: <fea61694-367d-7161-e071-4a8f77810a68@selasky.org> In-Reply-To: <36a5927f9992ec828a0fe1e9bf480ce3@riseup.net> References: <20210203050828.GA21823@troutmask.apl.washington.edu> <4581b83f-e048-fb8b-edfe-44332d3dc460@FreeBSD.org> <20210203160324.GA23963@troutmask.apl.washington.edu> <20210204105029.5fc11bed5df0e4283f983fbf@bidouilliste.com> <36a5927f9992ec828a0fe1e9bf480ce3@riseup.net>
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On 2/8/21 1:53 PM, Alastair Hogge wrote:
> Boot to multi-user; login (getty):
> $ doas kldload /boot/modules/amdgpu.ko
> $ sysctl
> [panic]
>
> ..is a guaranteed way to panic my system.
Hi,
Maybe you could do a hack and edit the sysctl source code:
1) print the sysctl before it is queried.
2) sleep 1 second between print and query.
Should be easy to nail this down!
--HPS
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diff --git a/sbin/sysctl/sysctl.c b/sbin/sysctl/sysctl.c
index 30d6d94723f..4b45bb2f967 100644
--- a/sbin/sysctl/sysctl.c
+++ b/sbin/sysctl/sysctl.c
@@ -336,6 +336,10 @@ parse_numeric(const char *newvalstr, const char *fmt, u_int kind,
return (true);
}
+#define sysctl(...) ({ \
+ usleep(1000000); \
+ sysctl(__VA_ARGS__); })
+
/*
* Parse a name into a MIB entry.
* Lookup and print out the MIB entry if it exists.
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