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+
+qemu-cris segfaults upon loading userspace binary
+
+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. \ No newline at end of file