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[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.] ** Tags added: patch -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1349277 Title: AArch64 emulation ignores SPSel=0 when taking (or returning from) an exception at EL1 or greater Status in QEMU: New Status in qemu package in Ubuntu: In Progress Bug description: The AArch64 emulation ignores SPSel=0 when: (1) taking an interrupt from an exception level greater than EL0 (e.g., EL1t), (2) returning from an exception (via ERET) to an exception level greater than EL0 (e.g., EL1t), with SPSR_ELx[SPSel]=0. The attached patch fixes the problem in my application. Background: I'm running a standalone application (toy OS) that is performing preemptive multithreading between threads running at EL1t, with exception handling / context switching occurring at EL1h. This bug causes the stack pointer to be corrupted in the threads running at EL1t (they end up with a version of the EL1h stack pointer (SP_EL1)). Occurs in: qemu-2.1.0-rc1 (found in) commit c60a57ff497667780132a3fcdc1500c83af5d5c0 (current master) To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1349277/+subscriptions