On Thu, Oct 08, 2020 at 12:45:30PM +0530, Maninder Singh wrote: > Observed Stack Overflow on 8KB kernel stack on ARM specially > incase on network interrupts, which results in undeterministic behaviour. > So there is need for per cpu dedicated IRQ stack for ARM. > > As ARm does not have extra co-processor register > to save thread info pointer, IRQ stack will be at some > performance cost, so code is under CONFIG_IRQ_STACK. > > and we don't have much knowledge and set up for CLANG > and ARM_UNWIND, so dependency added for both cases. > > Tested patch set with QEMU for latest kernel > and 4.1 kernel for ARM target with same patch set.
You need to investigate and show where and why this is happening. My guess is you have a network driver that uses a lot of kernel stack space, which itself would be a bug. Note that there are compiler versions out there that mis-optimise and eat stack space - the kernel build should be warning if a function uses a large amount of stack. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
