[-cc linux-pci (nothing here is PCI-specific)] On Sat, Nov 16, 2019 at 06:05:05AM +0530, Muni Sekhar wrote: > My kernel is built with the following options: > > $ cat /boot/config-5.0.1 | grep NO_HZ > CONFIG_NO_HZ_COMMON=y > CONFIG_NO_HZ_IDLE=y > # CONFIG_NO_HZ_FULL is not set > CONFIG_NO_HZ=y > CONFIG_RCU_FAST_NO_HZ=y > > I booted with watchdog enabled(nmi_watchdog=1) as given below: > > BOOT_IMAGE=/boot/vmlinuz-5.0.1 > root=UUID=f65454ae-3f1d-4b9e-b4be-74a29becbe1e ro debug > ignore_loglevel console=ttyUSB0,115200 console=tty0 console=tty1 > console=ttyS2,115200 memmap=1M!1023M nmi_watchdog=1 > crashkernel=384M-:128M > > When the system is frozen or the kernel is locked up(I noticed that in > this state kernel is not responding for ALT-SysRq-<command key>) but > watchdog is not triggered. So I want to understand how to enable the > watchdog timer and how to verify the basic watchdog functionality > behavior? I don't know much about the watchdog, but I assume you've found these already? Documentation/admin-guide/lockup-watchdogs.rst Documentation/admin-guide/sysctl/kernel.rst Do you have CONFIG_HAVE_NMI_WATCHDOG=y? (See arch/Kconfig)
