* QOM crash via soundhw_init() @ 2023-10-12 10:53 Philippe Mathieu-Daudé 2023-10-12 16:26 ` Peng Liang 0 siblings, 1 reply; 3+ messages in thread From: Philippe Mathieu-Daudé @ 2023-10-12 10:53 UTC (permalink / raw) To: Paolo Bonzini, Markus Armbruster, Martin Kletzander, Marc-André Lureau Cc: QEMU Developers Hi Martin, Paolo, Markus, Marc-André, With the following changes: -- >8 -- diff --git a/hw/ppc/prep.c b/hw/ppc/prep.c index 137276bcb9..291495f798 100644 --- a/hw/ppc/prep.c +++ b/hw/ppc/prep.c @@ -245,6 +245,7 @@ static void ibm_40p_init(MachineState *machine) uint32_t kernel_base = 0, initrd_base = 0; long kernel_size = 0, initrd_size = 0; char boot_device; + MemoryRegion rom; if (kvm_enabled()) { error_report("machine %s does not support the KVM accelerator", @@ -277,6 +278,9 @@ static void ibm_40p_init(MachineState *machine) exit(1); } + memory_region_init_rom_nomigrate(&rom, OBJECT(machine), "test", + 4 * KiB, &error_fatal); + /* PCI -> ISA bridge */ i82378_dev = DEVICE(pci_new(PCI_DEVFN(11, 0), "i82378")); qdev_connect_gpio_out(i82378_dev, 0, --- I'm getting: $ ./qemu-system-ppc -M 40p -S -nodefaults ==3518191==WARNING: ASan doesn't fully support makecontext/swapcontext functions and may produce false positives in some cases! qom/object.c:935:13: runtime error: member access within null pointer of type 'struct TypeImpl' AddressSanitizer:DEADLYSIGNAL ================================================================= ==3518191==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x55f728f5e179 bp 0x7ffd91999220 sp 0x7ffd919991d0 T0) ==3518191==The signal is caused by a READ memory access. ==3518191==Hint: address points to the zero page. #0 0x55f728f5e179 in object_class_dynamic_cast qom/object.c:935 #1 0x55f728f5d9f4 in object_dynamic_cast qom/object.c:876 #2 0x55f728f6605a in object_resolve_abs_path qom/object.c:2096 #3 0x55f728f662f1 in object_resolve_partial_path qom/object.c:2120 #4 0x55f728f6648a in object_resolve_partial_path qom/object.c:2130 #5 0x55f728f6648a in object_resolve_partial_path qom/object.c:2130 #6 0x55f728f668b7 in object_resolve_path_type qom/object.c:2159 #7 0x55f727ab14c8 in soundhw_init hw/audio/soundhw.c:112 #8 0x55f72858f27e in qemu_create_cli_devices system/vl.c:2604 #9 0x55f72858f8c7 in qmp_x_exit_preconfig system/vl.c:2685 #10 0x55f7285955cd in qemu_init system/vl.c:3734 #11 0x55f72790620a in main system/main.c:47 #12 0x7fd5fec57d8f in __libc_start_call_main #13 0x7fd5fec57e3f in __libc_start_main_impl libc-start.c:392 #14 0x55f727906104 in _start (build_asan/qemu-system-ppc+0x2ca4104) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV qom/object.c:935 in object_class_dynamic_cast ==3518191==ABORTING O_o Any idea what I'm missing? Unified diff running with '-trace obj\* ': @@ -1,4 +1,4 @@ -==3534948==WARNING: ASan doesn't fully support makecontext/swapcontext functions and may produce false positives in some cases! +==3533425==WARNING: ASan doesn't fully support makecontext/swapcontext functions and may produce false positives in some cases! object_class_dynamic_cast_assert authz-pam->user-creatable (include/qom/object_interfaces.h:11:USER_CREATABLE_CLASS) object_class_dynamic_cast_assert authz-pam->authz (include/authz/base.h:30:QAUTHZ_CLASS) object_class_dynamic_cast_assert device->device (include/hw/qdev-core.h:77:DEVICE_CLASS) @@ -2481,6 +2481,7 @@ object_class_dynamic_cast_assert PCI->bus (include/hw/qdev-core.h:315:BUS_GET_CLASS) object_dynamic_cast_assert PCI->PCI (include/hw/pci/pci.h:270:PCI_BUS) object_dynamic_cast_assert PCI->PCI (include/hw/pci/pci.h:270:PCI_BUS) +object_dynamic_cast_assert memory-region->memory-region (include/exec/memory.h:37:MEMORY_REGION) object_dynamic_cast_assert i82378->device (include/hw/qdev-core.h:77:DEVICE) object_dynamic_cast_assert i82378->device (include/hw/qdev-core.h:77:DEVICE) object_dynamic_cast_assert i82378->device (include/hw/qdev-core.h:77:DEVICE) @@ -3014,355 +3015,28 @@ object_dynamic_cast_assert memory-region->memory-region (include/exec/memory.h:37:MEMORY_REGION) object_dynamic_cast_assert memory-region->memory-region (include/exec/memory.h:37:MEMORY_REGION) object_dynamic_cast_assert memory-region->memory-region (include/exec/memory.h:37:MEMORY_REGION) -object_dynamic_cast_assert fw_cfg_mem->fw_cfg (include/hw/nvram/fw_cfg.h:15:FW_CFG) -object_dynamic_cast_assert 40p-machine->machine (include/hw/boards.h:23:MACHINE) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert or-irq->device (include/hw/qdev-core.h:77:DEVICE) -object_class_dynamic_cast_assert or-irq->device (include/hw/qdev-core.h:77:DEVICE_GET_CLASS) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert mc146818rtc->device (include/hw/qdev-core.h:77:DEVICE) -object_class_dynamic_cast_assert mc146818rtc->device (include/hw/qdev-core.h:77:DEVICE_GET_CLASS) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert isa-i8259->device (include/hw/qdev-core.h:77:DEVICE) -object_class_dynamic_cast_assert isa-i8259->device (include/hw/qdev-core.h:77:DEVICE_GET_CLASS) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) -object_dynamic_cast_assert rs6000-mc->device (include/hw/qdev-core.h:77:DEVICE) -object_class_dynamic_cast_assert rs6000-mc->device (include/hw/qdev-core.h:77:DEVICE_GET_CLASS) [...] Thanks, Phil. ^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: QOM crash via soundhw_init() 2023-10-12 10:53 QOM crash via soundhw_init() Philippe Mathieu-Daudé @ 2023-10-12 16:26 ` Peng Liang 2023-10-12 16:48 ` Philippe Mathieu-Daudé 0 siblings, 1 reply; 3+ messages in thread From: Peng Liang @ 2023-10-12 16:26 UTC (permalink / raw) To: Philippe Mathieu-Daudé, Paolo Bonzini, Markus Armbruster, Martin Kletzander, Marc-André Lureau Cc: QEMU Developers On 10/12/2023 18:53, Philippe Mathieu-Daudé wrote: > Hi Martin, Paolo, Markus, Marc-André, > > With the following changes: > > -- >8 -- > diff --git a/hw/ppc/prep.c b/hw/ppc/prep.c > index 137276bcb9..291495f798 100644 > --- a/hw/ppc/prep.c > +++ b/hw/ppc/prep.c > @@ -245,6 +245,7 @@ static void ibm_40p_init(MachineState *machine) > uint32_t kernel_base = 0, initrd_base = 0; > long kernel_size = 0, initrd_size = 0; > char boot_device; > + MemoryRegion rom; > > if (kvm_enabled()) { > error_report("machine %s does not support the KVM accelerator", > @@ -277,6 +278,9 @@ static void ibm_40p_init(MachineState *machine) > exit(1); > } > > + memory_region_init_rom_nomigrate(&rom, OBJECT(machine), "test", > + 4 * KiB, &error_fatal); > + > /* PCI -> ISA bridge */ > i82378_dev = DEVICE(pci_new(PCI_DEVFN(11, 0), "i82378")); > qdev_connect_gpio_out(i82378_dev, 0, > > --- I think it can be fixed by changing the type of rom to MemoryRegion*, such as: diff --git a/hw/ppc/prep.c b/hw/ppc/prep.c index 137276bcb9..b5c2345ec8 100644 --- a/hw/ppc/prep.c +++ b/hw/ppc/prep.c @@ -245,6 +245,7 @@ static void ibm_40p_init(MachineState *machine) uint32_t kernel_base = 0, initrd_base = 0; long kernel_size = 0, initrd_size = 0; char boot_device; + MemoryRegion *rom = g_new0(MemoryRegion, 1); if (kvm_enabled()) { error_report("machine %s does not support the KVM accelerator", @@ -277,6 +278,9 @@ static void ibm_40p_init(MachineState *machine) exit(1); } + memory_region_init_rom_nomigrate(rom, OBJECT(machine), "test", 4 * KiB, + &error_fatal); + /* PCI -> ISA bridge */ i82378_dev = DEVICE(pci_new(PCI_DEVFN(11, 0), "i82378")); qdev_connect_gpio_out(i82378_dev, 0, --- In the original patch, rom is an object on stack and machine will save a reference to rom in its properties after memory_region_init_rom_nomigrate. When the function returns, the stack frame is freed and the data in rom becomes to garbage. After that, when we call object_resolve_path_type, the properties of machine will be used to match the specific path and type, then we will use some garbage in rom (which is on stack). Thanks, Peng > > I'm getting: > > $ ./qemu-system-ppc -M 40p -S -nodefaults > ==3518191==WARNING: ASan doesn't fully support makecontext/swapcontext functions and may produce false positives in some cases! > qom/object.c:935:13: runtime error: member access within null pointer of type 'struct TypeImpl' > AddressSanitizer:DEADLYSIGNAL > ================================================================= > ==3518191==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x55f728f5e179 bp 0x7ffd91999220 sp 0x7ffd919991d0 T0) > ==3518191==The signal is caused by a READ memory access. > ==3518191==Hint: address points to the zero page. > #0 0x55f728f5e179 in object_class_dynamic_cast qom/object.c:935 > #1 0x55f728f5d9f4 in object_dynamic_cast qom/object.c:876 > #2 0x55f728f6605a in object_resolve_abs_path qom/object.c:2096 > #3 0x55f728f662f1 in object_resolve_partial_path qom/object.c:2120 > #4 0x55f728f6648a in object_resolve_partial_path qom/object.c:2130 > #5 0x55f728f6648a in object_resolve_partial_path qom/object.c:2130 > #6 0x55f728f668b7 in object_resolve_path_type qom/object.c:2159 > #7 0x55f727ab14c8 in soundhw_init hw/audio/soundhw.c:112 > #8 0x55f72858f27e in qemu_create_cli_devices system/vl.c:2604 > #9 0x55f72858f8c7 in qmp_x_exit_preconfig system/vl.c:2685 > #10 0x55f7285955cd in qemu_init system/vl.c:3734 > #11 0x55f72790620a in main system/main.c:47 > #12 0x7fd5fec57d8f in __libc_start_call_main > #13 0x7fd5fec57e3f in __libc_start_main_impl libc-start.c:392 > #14 0x55f727906104 in _start (build_asan/qemu-system-ppc+0x2ca4104) > > AddressSanitizer can not provide additional info. > SUMMARY: AddressSanitizer: SEGV qom/object.c:935 in object_class_dynamic_cast > ==3518191==ABORTING > > O_o > > Any idea what I'm missing? > > Unified diff running with '-trace obj\* ': > > @@ -1,4 +1,4 @@ > -==3534948==WARNING: ASan doesn't fully support makecontext/swapcontext functions and may produce false positives in some cases! > +==3533425==WARNING: ASan doesn't fully support makecontext/swapcontext functions and may produce false positives in some cases! > object_class_dynamic_cast_assert authz-pam->user-creatable (include/qom/object_interfaces.h:11:USER_CREATABLE_CLASS) > object_class_dynamic_cast_assert authz-pam->authz (include/authz/base.h:30:QAUTHZ_CLASS) > object_class_dynamic_cast_assert device->device (include/hw/qdev-core.h:77:DEVICE_CLASS) > @@ -2481,6 +2481,7 @@ > object_class_dynamic_cast_assert PCI->bus (include/hw/qdev-core.h:315:BUS_GET_CLASS) > object_dynamic_cast_assert PCI->PCI (include/hw/pci/pci.h:270:PCI_BUS) > object_dynamic_cast_assert PCI->PCI (include/hw/pci/pci.h:270:PCI_BUS) > +object_dynamic_cast_assert memory-region->memory-region (include/exec/memory.h:37:MEMORY_REGION) > object_dynamic_cast_assert i82378->device (include/hw/qdev-core.h:77:DEVICE) > object_dynamic_cast_assert i82378->device (include/hw/qdev-core.h:77:DEVICE) > object_dynamic_cast_assert i82378->device (include/hw/qdev-core.h:77:DEVICE) > @@ -3014,355 +3015,28 @@ > object_dynamic_cast_assert memory-region->memory-region (include/exec/memory.h:37:MEMORY_REGION) > object_dynamic_cast_assert memory-region->memory-region (include/exec/memory.h:37:MEMORY_REGION) > object_dynamic_cast_assert memory-region->memory-region (include/exec/memory.h:37:MEMORY_REGION) > -object_dynamic_cast_assert fw_cfg_mem->fw_cfg (include/hw/nvram/fw_cfg.h:15:FW_CFG) > -object_dynamic_cast_assert 40p-machine->machine (include/hw/boards.h:23:MACHINE) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert or-irq->device (include/hw/qdev-core.h:77:DEVICE) > -object_class_dynamic_cast_assert or-irq->device (include/hw/qdev-core.h:77:DEVICE_GET_CLASS) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert mc146818rtc->device (include/hw/qdev-core.h:77:DEVICE) > -object_class_dynamic_cast_assert mc146818rtc->device (include/hw/qdev-core.h:77:DEVICE_GET_CLASS) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert isa-i8259->device (include/hw/qdev-core.h:77:DEVICE) > -object_class_dynamic_cast_assert isa-i8259->device (include/hw/qdev-core.h:77:DEVICE_GET_CLASS) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert (null)->device (include/hw/qdev-core.h:77:DEVICE) > -object_dynamic_cast_assert rs6000-mc->device (include/hw/qdev-core.h:77:DEVICE) > -object_class_dynamic_cast_assert rs6000-mc->device (include/hw/qdev-core.h:77:DEVICE_GET_CLASS) > [...] > > Thanks, > > Phil. > ^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: QOM crash via soundhw_init() 2023-10-12 16:26 ` Peng Liang @ 2023-10-12 16:48 ` Philippe Mathieu-Daudé 0 siblings, 0 replies; 3+ messages in thread From: Philippe Mathieu-Daudé @ 2023-10-12 16:48 UTC (permalink / raw) To: Peng Liang, Paolo Bonzini, Markus Armbruster, Martin Kletzander, Marc-André Lureau Cc: QEMU Developers On 12/10/23 18:26, Peng Liang wrote: > On 10/12/2023 18:53, Philippe Mathieu-Daudé wrote: >> Hi Martin, Paolo, Markus, Marc-André, >> >> With the following changes: >> >> -- >8 -- >> diff --git a/hw/ppc/prep.c b/hw/ppc/prep.c >> index 137276bcb9..291495f798 100644 >> --- a/hw/ppc/prep.c >> +++ b/hw/ppc/prep.c >> @@ -245,6 +245,7 @@ static void ibm_40p_init(MachineState *machine) >> uint32_t kernel_base = 0, initrd_base = 0; >> long kernel_size = 0, initrd_size = 0; >> char boot_device; >> + MemoryRegion rom; >> >> if (kvm_enabled()) { >> error_report("machine %s does not support the KVM accelerator", >> @@ -277,6 +278,9 @@ static void ibm_40p_init(MachineState *machine) >> exit(1); >> } >> >> + memory_region_init_rom_nomigrate(&rom, OBJECT(machine), "test", >> + 4 * KiB, &error_fatal); >> + >> /* PCI -> ISA bridge */ >> i82378_dev = DEVICE(pci_new(PCI_DEVFN(11, 0), "i82378")); >> qdev_connect_gpio_out(i82378_dev, 0, >> >> --- > > I think it can be fixed by changing the type of rom to MemoryRegion*, such as: > diff --git a/hw/ppc/prep.c b/hw/ppc/prep.c > index 137276bcb9..b5c2345ec8 100644 > --- a/hw/ppc/prep.c > +++ b/hw/ppc/prep.c > @@ -245,6 +245,7 @@ static void ibm_40p_init(MachineState *machine) > uint32_t kernel_base = 0, initrd_base = 0; > long kernel_size = 0, initrd_size = 0; > char boot_device; > + MemoryRegion *rom = g_new0(MemoryRegion, 1); > > if (kvm_enabled()) { > error_report("machine %s does not support the KVM accelerator", > @@ -277,6 +278,9 @@ static void ibm_40p_init(MachineState *machine) > exit(1); > } > > + memory_region_init_rom_nomigrate(rom, OBJECT(machine), "test", 4 * KiB, > + &error_fatal); > + > /* PCI -> ISA bridge */ > i82378_dev = DEVICE(pci_new(PCI_DEVFN(11, 0), "i82378")); > qdev_connect_gpio_out(i82378_dev, 0, > --- > > In the original patch, rom is an object on stack and machine will save a reference > to rom in its properties after memory_region_init_rom_nomigrate. When the function > returns, the stack frame is freed and the data in rom becomes to garbage. After that, > when we call object_resolve_path_type, the properties of machine will be used to > match the specific path and type, then we will use some garbage in rom (which is on > stack). YES! Stupid mistake... Thank you Peng, you saved my day :) ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-10-12 16:48 UTC | newest] Thread overview: 3+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2023-10-12 10:53 QOM crash via soundhw_init() Philippe Mathieu-Daudé 2023-10-12 16:26 ` Peng Liang 2023-10-12 16:48 ` Philippe Mathieu-Daudé
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