A more concise version and corresponding notes. Might help :) -- [ Reproducer
cat << EOF | ../build/qemu-system-i386 -machine q35 \ -nodefaults -device rtl8139,netdev=net0 \ -netdev user,id=net0 -display none -qtest stdio outl 0xcf8 0x80000804 outb 0xcfc 0x06 outl 0xcf8 0x80000817 outb 0xcfc 0xff write 0xff000037 0x1 0x0c writel 0xff000030 0xff000010 write 0xff000040 0x4 0x100006 write 0xff000044 0x4 0x01 write 0xff000010 0x4 0x01 EOF -- [ Notes /* Make the MMIO region start from 0xff000000 */ outl 0xcf8 0x80000817 outb 0xcfc 0xff /*Command Register: enable receiver and transmitter*/ write 0xff000037 0x1 0x0c /* set Receive (Rx) Buffer Start Address at 0xff000010 */ /* Note: 0xff000010 - 0xff000000 = 0x10 is the offset of TSD0*/ writel 0xff000030 0xff000010 /* TXRR, Tx Retry Count = 1 */ /* set transmit mode into the loopback */ write 0xff000040 0x4 0x100006 /* Receive Configuration Register: Accept All Packets */ write 0xff000044 0x4 0x01 /* TSD0: set Descriptor Size to 1 and trigger a tranfer*/ write 0xff000010 0x4 0x01 -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1910826 Title: [OSS-Fuzz] Issue 29224 rtl8139: Stack-overflow in rtlNUMBER_transmit_one Status in QEMU: New Bug description: === Reproducer === cat << EOF | ../build/qemu-system-i386 -machine q35 \ -nodefaults -device rtl8139,netdev=net0 \ -netdev user,id=net0 -display none -qtest stdio outl 0xcf8 0x80000804 outb 0xcfc 0x26 outl 0xcf8 0x80000817 outb 0xcfc 0xff write 0x1 0x1 0x42 write 0x5 0x1 0x42 write 0x9 0x1 0x42 write 0xd 0x1 0x42 write 0xff000044 0x4 0x11 write 0xff000037 0x1 0x1c writel 0xff000030 0xff000000 write 0xff000040 0x4 0x100006 write 0xff000010 0x4 0x01020 EOF === Stack Trace === ==2819215==ERROR: AddressSanitizer: stack-overflow on address 0x7ffd2c714040 (pc 0x5639b3a933d9 bp 0x7ffd2c716210 sp 0x7ffd2c714040 T0) #0 rtl8139_transmit_one /src/qemu/hw/net/rtl8139.c:1815 #1 rtl8139_transmit /src/qemu/hw/net/rtl8139.c:2388:9 #2 rtl8139_TxStatus_write /src/qemu/hw/net/rtl8139.c:2442:5 #3 rtl8139_io_writel /src/qemu/hw/net/rtl8139.c:2865:13 #4 rtl8139_ioport_write /src/qemu/hw/net/rtl8139.c:3290:9 #5 memory_region_write_accessor /src/qemu/softmmu/memory.c:491:5 #6 access_with_adjusted_size /src/qemu/softmmu/memory.c:552:18 #7 memory_region_dispatch_write /src/qemu/softmmu/memory.c:0:13 #8 flatview_write_continue /src/qemu/softmmu/physmem.c:2759:23 #9 flatview_write /src/qemu/softmmu/physmem.c:2799:14 #10 address_space_write /src/qemu/softmmu/physmem.c:2891:18 #11 address_space_rw /src/qemu/softmmu/physmem.c:2901:16 #12 dma_memory_rw_relaxed /src/qemu/include/sysemu/dma.h:88:12 #13 dma_memory_rw /src/qemu/include/sysemu/dma.h:127:12 #14 pci_dma_rw /src/qemu/include/hw/pci/pci.h:801:12 #15 pci_dma_write /src/qemu/include/hw/pci/pci.h:837:12 #16 rtl8139_write_buffer /src/qemu/hw/net/rtl8139.c:778:5 #17 rtl8139_do_receive /src/qemu/hw/net/rtl8139.c:1172:9 #18 rtl8139_transfer_frame /src/qemu/hw/net/rtl8139.c:1798:9 #19 rtl8139_transmit_one /src/qemu/hw/net/rtl8139.c:1845:5 #20 rtl8139_transmit /src/qemu/hw/net/rtl8139.c:2388:9 #21 rtl8139_TxStatus_write /src/qemu/hw/net/rtl8139.c:2442:5 #22 rtl8139_io_writel /src/qemu/hw/net/rtl8139.c:2865:13 #23 rtl8139_ioport_write /src/qemu/hw/net/rtl8139.c:3290:9 #24 memory_region_write_accessor /src/qemu/softmmu/memory.c:491:5 #25 access_with_adjusted_size /src/qemu/softmmu/memory.c:552:18 #26 memory_region_dispatch_write /src/qemu/softmmu/memory.c:0:13 #27 flatview_write_continue /src/qemu/softmmu/physmem.c:2759:23 #28 flatview_write /src/qemu/softmmu/physmem.c:2799:14 #29 address_space_write /src/qemu/softmmu/physmem.c:2891:18 #30 address_space_rw /src/qemu/softmmu/physmem.c:2901:16 #31 dma_memory_rw_relaxed /src/qemu/include/sysemu/dma.h:88:12 #32 dma_memory_rw /src/qemu/include/sysemu/dma.h:127:12 #33 pci_dma_rw /src/qemu/include/hw/pci/pci.h:801:12 #34 pci_dma_write /src/qemu/include/hw/pci/pci.h:837:12 #35 rtl8139_write_buffer /src/qemu/hw/net/rtl8139.c:778:5 #36 rtl8139_do_receive /src/qemu/hw/net/rtl8139.c:1172:9 #37 rtl8139_transfer_frame /src/qemu/hw/net/rtl8139.c:1798:9 Repeat until we run out of stack https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=29224 To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1910826/+subscriptions
