I finally got a full stack trace via sysrq. A lot of stacks seem to end in page fault -- I wonder if its because my page file is a loopback on btrfs. https://pastebin.com/GyWAu1EP $ cat /proc/cmdline BOOT_IMAGE=/vmlinuz-4.14.8-1.el7.elrepo.x86_64 root=UUID=35f0ce3f-0902-47a3-8ad8-86179d1f3e3a ro rootflags=subvol=root00 vconsole.keymap=us crashkernel=128M vconsole.font=latarcyrheb-sun16 consoleblank=600 scsi_mod.use_blk_mq=n LANG=en_US.UTF-8 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
