The QEMU project is currently moving its bug tracking to another system. For this we need to know which bugs are still valid and which could be closed already. Thus we are setting the bug state to "Incomplete" now.
If the bug has already been fixed in the latest upstream version of QEMU, then please close this ticket as "Fix released". If it is not fixed yet and you think that this bug report here is still valid, then you have two options: 1) If you already have an account on gitlab.com, please open a new ticket for this problem in our new tracker here: https://gitlab.com/qemu-project/qemu/-/issues and then close this ticket here on Launchpad (or let it expire auto- matically after 60 days). Please mention the URL of this bug ticket on Launchpad in the new ticket on GitLab. 2) If you don't have an account on gitlab.com and don't intend to get one, but still would like to keep this ticket opened, then please switch the state back to "New" or "Confirmed" within the next 60 days (other- wise it will get closed as "Expired"). We will then eventually migrate the ticket automatically to the new system (but you won't be the reporter of the bug in the new system and thus you won't get notified on changes anymore). Thank you and sorry for the inconvenience. ** Changed in: qemu Status: New => Incomplete ** Tags added: i386 -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1915682 Title: i386-linux-user wine exception regression tests fail Status in QEMU: Incomplete Bug description: When trying to run wine (latest devel from git) regression tests for ntdll in a statically linked qemu-i386 (commit 392b9a74b9b621c52d05e37bc6f41f1bbab5c6f8) on arm32 (raspberry pi 4) in a debian buster chroot, the exception tests fail at the first test with an infinite exception loop. WINEDEBUG=+seh wine wine/dlls/ntdll/tests/ntdll_test.exe exception Working x86_64 system running 32-bit code 0024:warn:seh:dispatch_exception EXCEPTION_ACCESS_VIOLATION exception (code=c0000005) raised 0024:trace:seh:dispatch_exception eax=00000000 ebx=7ffc2000 ecx=004e0ef4 edx=003c0004 esi=003c0000 edi=00000000 0024:trace:seh:dispatch_exception ebp=0085fa08 esp=0085f9ac cs=0023 ds=002b es=002b fs=0063 gs=006b flags=00010246 0024:trace:seh:call_vectored_handlers calling handler at 7B00B460 code=c0000005 flags=0 0024:trace:seh:call_vectored_handlers handler at 7B00B460 returned 0 0024:trace:seh:call_stack_handlers calling handler at 004178B0 code=c0000005 flags=0 0024:trace:seh:call_stack_handlers handler at 004178B0 returned 0 0024:trace:seh:dispatch_exception call_stack_handlers continuing 0024:trace:seh:NtGetContextThread 0xfffffffe: dr0=42424240 dr1=00000000 dr2=126bb070 dr3=0badbad0 dr6=00000000 dr7=ffff0115 Non-working qemu 0024:warn:seh:dispatch_exception EXCEPTION_ACCESS_VIOLATION exception (code=c0000005) raised 0024:trace:seh:dispatch_exception eax=00000000 ebx=3ffe2000 ecx=004e0ef4 edx=003c0004 esi=003c0000 edi=00000000 0024:trace:seh:dispatch_exception ebp=0085fa08 esp=0085f9ac cs=0023 ds=002b es=002b fs=003b gs=0033 flags=00000246 0024:trace:seh:call_vectored_handlers calling handler at 7B00B460 code=c0000005 flags=0 0024:trace:seh:call_vectored_handlers handler at 7B00B460 returned 0 0024:trace:seh:call_stack_handlers calling handler at 004178B0 code=c0000005 flags=0 0024:trace:seh:call_stack_handlers handler at 004178B0 returned 0 0024:trace:seh:dispatch_exception call_stack_handlers continuing 0024:trace:seh:dispatch_exception call_stack_handlers ret status = 0 0024:trace:seh:dispatch_exception code=0 flags=1 addr=7BC2389C ip=7bc2389c tid=0024 The non-working verion is never managing to set the CPU context using NtContinue/SetContextThread back to the correct running thread stack and IP. It executes as if the context restore just returns to the function that called NtContinue() (dispatch_exception(), not the function that raised the exception or one of its parent exception handlers). It looks like NtSetContextThread(), specifically the asm function set_full_cpu_context() is being handled incorrectly. wine code below. note interesting use of iret with no previous interrupt call. The exception handler is called with a jmp. /*********************************************************************** * set_full_cpu_context * * Set the new CPU context. */ extern void set_full_cpu_context( const CONTEXT *context ); __ASM_GLOBAL_FUNC( set_full_cpu_context, "movl $0,%fs:0x1f8\n\t" /* x86_thread_data()->syscall_frame = NULL */ "movl 4(%esp),%ecx\n\t" "movw 0x8c(%ecx),%gs\n\t" /* SegGs */ "movw 0x90(%ecx),%fs\n\t" /* SegFs */ "movw 0x94(%ecx),%es\n\t" /* SegEs */ "movl 0x9c(%ecx),%edi\n\t" /* Edi */ "movl 0xa0(%ecx),%esi\n\t" /* Esi */ "movl 0xa4(%ecx),%ebx\n\t" /* Ebx */ "movl 0xb4(%ecx),%ebp\n\t" /* Ebp */ "movw %ss,%ax\n\t" "cmpw 0xc8(%ecx),%ax\n\t" /* SegSs */ "jne 1f\n\t" /* As soon as we have switched stacks the context structure could * be invalid (when signal handlers are executed for example). Copy * values on the target stack before changing ESP. */ "movl 0xc4(%ecx),%eax\n\t" /* Esp */ "leal -4*4(%eax),%eax\n\t" "movl 0xc0(%ecx),%edx\n\t" /* EFlags */ ".byte 0x36\n\t" "movl %edx,3*4(%eax)\n\t" "movl 0xbc(%ecx),%edx\n\t" /* SegCs */ ".byte 0x36\n\t" "movl %edx,2*4(%eax)\n\t" "movl 0xb8(%ecx),%edx\n\t" /* Eip */ ".byte 0x36\n\t" "movl %edx,1*4(%eax)\n\t" "movl 0xb0(%ecx),%edx\n\t" /* Eax */ ".byte 0x36\n\t" "movl %edx,0*4(%eax)\n\t" "pushl 0x98(%ecx)\n\t" /* SegDs */ "movl 0xa8(%ecx),%edx\n\t" /* Edx */ "movl 0xac(%ecx),%ecx\n\t" /* Ecx */ "popl %ds\n\t" "movl %eax,%esp\n\t" "popl %eax\n\t" "iret\n" /* Restore the context when the stack segment changes. We can't use * the same code as above because we do not know if the stack segment * is 16 or 32 bit, and 'movl' will throw an exception when we try to * access memory above the limit. */ "1:\n\t" "movl 0xa8(%ecx),%edx\n\t" /* Edx */ "movl 0xb0(%ecx),%eax\n\t" /* Eax */ "movw 0xc8(%ecx),%ss\n\t" /* SegSs */ "movl 0xc4(%ecx),%esp\n\t" /* Esp */ "pushl 0xc0(%ecx)\n\t" /* EFlags */ "pushl 0xbc(%ecx)\n\t" /* SegCs */ "pushl 0xb8(%ecx)\n\t" /* Eip */ "pushl 0x98(%ecx)\n\t" /* SegDs */ "movl 0xac(%ecx),%ecx\n\t" /* Ecx */ "popl %ds\n\t" "iret" ) To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1915682/+subscriptions