Date: Tue, 5 Nov 2019 12:44:06 -0500 From: Brennan Vincent <brennan@umanwizard.com> To: freebsd-current@freebsd.org Subject: Kernel panics sometimes resulting in no core dump. Message-ID: <9C7D409D-7305-4E3A-9F66-F518A8D321B8@umanwizard.com>
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(Note: I have also posted this to the forums, but upon reading the forum = guidelines more carefully I realized the mailing list is probably a = better venue. So if you are also a forum reader, I apologize for the = extra churn.) Hello, I am running 13-CURRENT (compiled recently from source using = default build settings) and recently I have been kernel panics every so = often. They can happen at any time but seem to be more likely when the = system is running a graphical environment and is at high load (e.g., = during `make -j64 buildworld`). I have configured my system to collect core dumps: my swap partition is = 50 GB (large enough to contain any conceivable minidump), `dumpon` = reports that it is indeed configured as a dump partition, and I have = `savecore_enable=3D"YES"` in /etc/rc.conf. I also have the sysctl = `debug.debugger_on_panic` set to 0, which seems to be necessary for core = dumps to happen (instead of breaking into the debugger on panic). = Before, when that sysctl was set to 1, my graphical environment would = hand; now it reboots. The changing behavior depending on the value of = `debug.debugger_on_panic` is what makes me think this really is a kernel = panic, as opposed to some other possible issue that could cause a crash. The weird thing is that when I manually cause a panic via `sudo sysctl = debug.kdb.panic=3D1` , my system reboots as expected, and a core dump = **does** get generated and saved in /var/crash! So it's only the = mysterious random crashes that aren't causing core dumps. Can anyone help me figure out why core dumps are not getting generated, = and how I can possibly debug what is going on?=
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