Hit at the desired moment, or execute sysctl debug.panic=1, then the system will break into the kernel debugger db>. Otherwise, add this to /etc/nf: kern.sync_on_panic=0 The kern.sync_on_panic controls whether to do a sync before rebooting from a panic, which is disabled by default as we required. For example: # cpdup /var/crash /home/var.crash If /var/crash is residing on a filesystem without enough room to accommodate the core dump, you can move it to a different filesystem and use a symbolic link. If your swap partition is too small, you should use any partition that doesn't contain a filesystem.Īdd this to /etc/rc.conf: dumpdev="/dev/" If your swap partition is as large as main memory, it can be used as a dump device. "sync on panic" should be disabled in the kernel var/crash must be on a filesystem with enough space to hold the dump (the size of main memory). Usually the swap partition is used as the dump partition. Therefore, do not upload it to somewhere that can be publicly accessed! RequirementsĪ dump partition not smaller than the main (physical) memory. WARNING: The saved core file (in /var/crash) contains sensitive data, e.g., passwords, certificates, decrypted private keys. WARNING: A core dump is obtained by triggering a kernel panic, which likes directly cutting off the power, therefore, unsaved data will be lost, recently saved data (still in the cache) might be lost, and filesystems mounted async might be destroyed. Sometimes, a system core dump (also called post-mortem dump) is needed to track down a bug in the DragonFly BSD kernel. Create a Core Dump Automatically on Panic.
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