On Wed, 6 Jun 2018 11:06:28 +0530 Bhupesh Sharma <bhsharma@xxxxxxxxxx> wrote: > Hello Petr, > > On Tue, Jun 5, 2018 at 1:31 PM, Petr Tesarik <ptesarik@xxxxxxx> wrote: > > Hi all, > > > > I have observed hangs after crash on a Raspberry Pi 3 Model B+ board > > when a panic kernel is loaded. I attached a hardware debugger and found > > out that all CPU cores were stopped except one which was stuck in the > > idle thread. It seems that irq_set_irqchip_state() may sleep, which is > > definitely not safe after a kernel panic. >[...] > Also do you get any console output from the crash kernel (you can try > passing earlycon to the crash kernel to see if it crashes early > enough)? If yes, can you please share the same. Maybe I wasn't clear enough. The crashed kernel does not even get to the kexec's purgatory code, so there cannot be any output from the crash kernel. >[...] > > #12 0xffff000001001cd0 in lan78xx_read_reg (index=152, data=0xffff000008e5396c <init_thread_union+14700>, dev=<optimized out>, dev=<optimized out>) > > at ../drivers/net/usb/lan78xx.c:425 > > Hmmm, this seems a bit misplaced, but are you using a usb-ethernet > adapter which causes a URB submission to timeout? Yes, RPi 3 B+ contains an on-board Microchip LAN7515, which is indeed a USB device. >[...] > > #26 0xffff000008081478 in do_mem_abort (addr=0, esr=2248146948, regs=0xffff000008e53d70 <init_thread_union+15728>) at ../arch/arm64/mm/fault.c:657 > > #27 0xffff000008082dd0 in el1_sync () at ../arch/arm64/kernel/entry.S:548 > > The ESR value from the logs (2248146948) indicates the following about > the panic causes (see ARMv8 Architecture Reference Manual for more > details): Thank you for all the detailx, but that's not relevant here. I am crashing my system intentionally to debug the kexec/kdump infrastructure... Petr T _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
