Now fixed in git master; will be in the imminent 4.1 release.
** Changed in: qemu Status: In Progress => Fix Committed -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1838475 Title: qemu-system-arm exits when cortex-m4 floating point used and irq occurs Status in QEMU: Fix Committed Bug description: qemu-system-arm exits with "...Secure UsageFault with CFSR.NOCP because NSACR.CP10 prevents stacking FP regs ...taking pending nonsecure exception 3 Taking exception 7 [Breakpoint] qemu: fatal: Lockup: can't escalate 3 to HardFault (current priority -1)" when emulating Cortex-m4, executing at least 1 floating point instruction, and then an irq (e.g. sys tick) occurring. CPACR.CP10 and CPACR.CP11 are set to 0x3 respectively prior to executing the fp instructions. NOTE: NSACR does not appear to be a cortex m4 register. Attached is a simplified elf to repro the issue. The qemu command line is: "qemu-system-arm --gdb tcp::1234 -cpu cortex-m4 -machine lm3s6965evb -nographic -semihosting-config enable=on,target=native -kernel QemuExitWhenUsingFPAndIRQOccurs.elf -d int" To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1838475/+subscriptions