Sounds like it's probably the bug where we don't correctly handle ELF BSS segments which have no content in the file at all (ie they're just "zero this memory" with no content). If so, this patch (currently in review) will fix it: https://patchew.org/QEMU/c9106487-dc4d-120a-bd48-665b3c617...@gmail.com/ and you could also work around it by making sure your guest binary has some r/w data so it doesn't have a segment that's purely BSS.
-- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1909770 Title: qemu-cris segfaults upon loading userspace binary Status in QEMU: New Bug description: I am on commit 65a3c5984074313602fb5f61cc5f464abfb020c7 (latest as far as I know). I compiled qemu with --enable-debug. I'm trying to run a userspace CRIS binary (`./qemu-cris -cpu crisv10 ./basic`), but this segfaults. When opening the coredump in gdb, I get gdb-peda$ bt #0 0x00007f272a2e1ee1 in __memset_avx2_erms () from /usr/lib/libc.so.6 #1 0x0000564a2f7bcda7 in zero_bss (elf_bss=0x82134, last_bss=0x84000, prot=0x3) at ../linux-user/elfload.c:1865 #2 0x0000564a2f7bff65 in load_elf_image ( image_name=0x7fffe9f5703d "./basic", image_fd=0x3, info=0x7fffe9f547c0, pinterp_name=0x7fffe9f545b0, bprm_buf=0x7fffe9f54920 "\177ELF\001\001\001") at ../linux-user/elfload.c:2801 #3 0x0000564a2f7c0a12 in load_elf_binary (bprm=0x7fffe9f54920, info=0x7fffe9f547c0) at ../linux-user/elfload.c:3104 #4 0x0000564a2f81f290 in loader_exec (fdexec=0x3, filename=0x7fffe9f5703d "./basic", argv=0x564a2f9f3cc0, envp=0x564a2fa12600, regs=0x7fffe9f54860, infop=0x7fffe9f547c0, bprm=0x7fffe9f54920) at ../linux-user/linuxload.c:147 #5 0x0000564a2f7c4f9f in main (argc=0x4, argv=0x7fffe9f54e78, envp=0x7fffe9f54ea0) at ../linux-user/main.c:808 #6 0x00007f272a1a4152 in __libc_start_main () from /usr/lib/libc.so.6 #7 0x0000564a2f786cee in _start () Or as a full backtrace: gdb-peda$ bt full #0 0x00007f272a2e1ee1 in __memset_avx2_erms () from /usr/lib/libc.so.6 No symbol table info available. #1 0x0000564a2f7bcda7 in zero_bss (elf_bss=0x82134, last_bss=0x84000, prot=0x3) at ../linux-user/elfload.c:1865 host_start = 0x92134 host_map_start = 0x93000 host_end = 0x94000 #2 0x0000564a2f7bff65 in load_elf_image ( image_name=0x7fffe9f5703d "./basic", image_fd=0x3, info=0x7fffe9f547c0, pinterp_name=0x7fffe9f545b0, bprm_buf=0x7fffe9f54920 "\177ELF\001\001\001") at ../linux-user/elfload.c:2801 vaddr = 0x82134 vaddr_em = 0x82140 vaddr_len = 0x2000 vaddr_po = 0x134 vaddr_ps = 0x82000 vaddr_ef = 0x82134 elf_prot = 0x3 eppnt = 0x7fffe9f54974 ehdr = 0x7fffe9f54920 phdr = 0x7fffe9f54954 load_addr = 0x80000 load_bias = 0x0 loaddr = 0x80000 hiaddr = 0x1082140 error = 0x80000 i = 0x1 retval = 0x273d2e9c prot_exec = 0x4 err = 0x0 __func__ = "load_elf_image" #3 0x0000564a2f7c0a12 in load_elf_binary (bprm=0x7fffe9f54920, info=0x7fffe9f547c0) at ../linux-user/elfload.c:3104 interp_info = { load_bias = 0x0, load_addr = 0x0, start_code = 0x0, end_code = 0x0, start_data = 0x0, end_data = 0x0, start_brk = 0x0, brk = 0x0, reserve_brk = 0x0, start_mmap = 0x0, start_stack = 0x0, stack_limit = 0x0, entry = 0x0, code_offset = 0x0, data_offset = 0x0, saved_auxv = 0x0, auxv_len = 0x0, arg_start = 0x0, arg_end = 0x0, arg_strings = 0x0, env_strings = 0x0, file_string = 0x0, elf_flags = 0x0, personality = 0x0, alignment = 0x0, loadmap_addr = 0x0, nsegs = 0x0, loadsegs = 0x0, pt_dynamic_addr = 0x0, interpreter_loadmap_addr = 0x0, interpreter_pt_dynamic_addr = 0x0, other_info = 0x0, note_flags = 0x0 } elf_ex = { e_ident = "|\214\t1\000\000\000\000\262\002\356_\000\000\000", e_type = 0x8c7c, e_machine = 0x3109, e_version = 0x0, e_entry = 0x5fee02b2, e_phoff = 0x0, e_shoff = 0x31098c7c, e_flags = 0x0, e_ehsize = 0x0, e_phentsize = 0x0, e_phnum = 0x0, e_shentsize = 0x0, e_shnum = 0x0, e_shstrndx = 0x0 } elf_interpreter = 0x0 scratch = 0x7f272a358021 <read+97> "H\213D$\bH\203\304(\303\017\037D" #4 0x0000564a2f81f290 in loader_exec (fdexec=0x3, filename=0x7fffe9f5703d "./basic", argv=0x564a2f9f3cc0, envp=0x564a2fa12600, regs=0x7fffe9f54860, infop=0x7fffe9f547c0, bprm=0x7fffe9f54920) at ../linux-user/linuxload.c:147 retval = 0x400 #5 0x0000564a2f7c4f9f in main (argc=0x4, argv=0x7fffe9f54e78, envp=0x7fffe9f54ea0) at ../linux-user/main.c:808 regs1 = { orig_r10 = 0x0, r0 = 0x0, r1 = 0x0, r2 = 0x0, r3 = 0x0, r4 = 0x0, r5 = 0x0, r6 = 0x0, r7 = 0x0, r8 = 0x0, r9 = 0x0, r10 = 0x0, r11 = 0x0, r12 = 0x0, r13 = 0x0, acr = 0x0, srs = 0x0, mof = 0x0, spc = 0x0, ccs = 0x0, srp = 0x0, erp = 0x0, exs = 0x0, eda = 0x0 } regs = 0x7fffe9f54860 info1 = { load_bias = 0x0, load_addr = 0x80000, start_code = 0x80000, end_code = 0x80133, start_data = 0xffffffff, end_data = 0x0, start_brk = 0x0, brk = 0x80133, reserve_brk = 0x1000000, start_mmap = 0x80000000, start_stack = 0x0, stack_limit = 0x0, entry = 0x80106, code_offset = 0x0, data_offset = 0x0, saved_auxv = 0x0, auxv_len = 0x0, arg_start = 0x0, arg_end = 0x0, arg_strings = 0x0, env_strings = 0x0, file_string = 0x0, elf_flags = 0x0, personality = 0x0, alignment = 0x2000, loadmap_addr = 0x0, nsegs = 0x2, loadsegs = 0x0, pt_dynamic_addr = 0x0, interpreter_loadmap_addr = 0x0, interpreter_pt_dynamic_addr = 0x0, other_info = 0x0, note_flags = 0x0 } info = 0x7fffe9f547c0 bprm = { buf = "\177ELF\001\001\001\000\000\000\000\000\000\000\000\000\002\000L\000\001\000\000\000\006\001\b\000\064\000\000\000\264\006\000\000\000\000\000\000\064\000 \000\003\000(\000\016\000\r\000\001\000\000\000\000\000\000\000\000\000\b\000\000\000\b\000\063\001\000\000\063\001\000\000\005\000\000\000\000 \000\000\001\000\000\000\064\001\000\000\064!\b\000\064!\b\000\000\000\000\000\f\000\000\000\006\000\000\000\000 \000\000\004\000\000\000\224\000\000\000\224\000\b\000\224\000\b\000$\000\000\000$\000\000\000\004\000\000\000\004\000\000\000\004\000\000\000\024\000\000\000\003\000\000\000GNU\000PH\017'i\204\231\070e\000\247\376\211\230\236\336Nf7\372\204\342\356\213n\206\214\342\374\201\352\253\370\201\353\273"..., p = 0x0, fd = 0x3, e_uid = 0x3e8, e_gid = 0x3d9, argc = 0x1, envc = 0x43, argv = 0x564a2f9f3cc0, envp = 0x564a2fa12600, filename = 0x7fffe9f5703d "./basic", core_dump = 0x0 } ts = 0x564a2fa25400 env = 0x564a2fa24a08 cpu = 0x564a2fa1c730 optind = 0x3 target_environ = 0x564a2fa12600 wrk = 0x7fffe9f550b8 target_argv = 0x564a2f9f3cc0 target_argc = 0x1 i = 0x1 ret = 0x7fff execfd = 0x3 log_mask = 0x0 max_reserved_va = 0xffffe000 #6 0x00007f272a1a4152 in __libc_start_main () from /usr/lib/libc.so.6 No symbol table info available. #7 0x0000564a2f786cee in _start () No symbol table info available. The binary itself is just a basic binary that prints "hello\n" to stdout. I have attached it. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1909770/+subscriptions
