So I wanted to use crash to look at a dump from a qemu KVM guest I write a dump file from the qemu console with dump-guest-core foo Then I do on the host crash vmlinux foo ... <segmentation violation in gdb> In gdb I see it seems to jump to 0 (gdb) p $pc $1 = (void (*)()) 0x0 (gdb) bt #0 0x0000000000000000 in ?? () #1 0x000000000073707a in ui_file_write (length_buf=1, buf=0x7fffffffbaaf "N", file=<optimized out>) at ui-file.c:224 #2 tee_file_write (file=<optimized out>, buf=0x7fffffffbaaf "N", length_buf=1) at ui-file.c:758 #3 0x00000000007337d6 in fputc_unfiltered (stream=0x126de20, c=<optimized out>) at utils.c:2209 #4 fputs_maybe_filtered (linebuffer=linebuffer@entry=0x1534a00 "No symbol \"task_struct\" in current context.\n", stream=stream@entry=0x126de20, filter=1) at utils.c:2126 #5 0x00000000007339b0 in vfprintf_maybe_filtered (stream=0x126de20, format=format@entry=0x9db4b5 "%s\n", args=args@entry=0x7fffffffbaf8, filter=1, filter=1) at utils.c:2332 #6 0x0000000000734a4c in vfprintf_filtered (args=0x7fffffffbaf8, format=0x9db4b5 "%s\n", stream=<optimized out>) at utils.c:2340 #7 fprintf_filtered (stream=<optimized out>, format=format@entry=0x9db4b5 "%s\n") at utils.c:2392 #8 0x0000000000676f67 in throw_exception (exception=...) at exceptions.c:234 #9 0x0000000000677219 in throw_it (reason=reason@entry=RETURN_ERROR, error=error@entry=GENERIC_ERROR, fmt=<optimized out>, ap=ap@entry=0x7fffffffbc48) at exceptions.c:434 #10 0x0000000000677436 in throw_verror (error=error@entry=GENERIC_ERROR, fmt=<optimized out>, ap=ap@entry=0x7fffffffbc48) at exceptions.c:440 #11 0x00000000007323d4 in error (string=<optimized out>) at utils.c:717 #12 0x00000000005ea1a3 in c_parse_internal () at c-exp.y:862 #13 0x00000000005ea4f9 in c_parse () at c-exp.y:3064 #14 0x00000000006a2fe1 in parse_exp_in_context (stringptr=stringptr@entry=0x7fffffffda18, pc=pc@entry=0, block=block@entry=0x0, comma=comma@entry=0, out_subexp=out_subexp@entry=0x0, void_context_p=0) at parse.c:1234 #15 0x00000000006a31e5 in parse_exp_1 (stringptr=stringptr@entry=0x7fffffffda68, pc=pc@entry=0, block=block@entry=0x0, comma=comma@entry=0) at parse.c:1136 #16 0x00000000006a3239 in parse_expression (string=0x8739b0 "task_struct") at parse.c:1279 #17 0x000000000064b270 in gdb_get_datatype (req=0xe61620 <shared_bufs>) at symtab.c:5330 #18 gdb_command_funnel (req=req@entry=0xe61620 <shared_bufs>) at symtab.c:5208 #19 0x00000000004ddc45 in gdb_interface (req=req@entry=0xe61620 <shared_bufs>) at gdb_interface.c:397 #20 0x00000000004de102 in gdb_session_init () at gdb_interface.c:244 #21 0x0000000000466c14 in main_loop () at main.c:637 #22 0x0000000000678e83 in captured_command_loop (data=data@entry=0x0) at main.c:258 #23 0x000000000067772a in catch_errors (func=func@entry=0x678e70 <captured_command_loop>, func_args=func_args@entry=0x0, errstring=errstring@entry=0x8b201f "", mask=mask@entry=6) at exceptions.c:557 #24 0x0000000000679e16 in captured_main (data=data@entry=0x7fffffffde00) at main.c:1064 #25 0x000000000067772a in catch_errors (func=func@entry=0x679150 <captured_main>, func_args=func_args@entry=0x7fffffffde00, errstring=errstring@entry=0x8b201f "", mask=mask@entry=6) at exceptions.c:557 #26 0x000000000067a177 in gdb_main (args=0x7fffffffde00) at main.c:1079 #27 gdb_main_entry (argc=<optimized out>, argv=argv@entry=0x7fffffffdf58) at main.c:1099 #28 0x00000000004dce84 in gdb_main_loop (argc=<optimized out>, argc@entry=3, argv=argv@entry=0x7fffffffdf58) at gdb_interface.c:76 #29 0x000000000046549f in main (argc=3, argv=0x7fffffffdf58) at main.c:613 Environment: Linux 3.11, current mainline linux (same result) FC19, qemu-system-x86-1.4.2-12.fc19.x86_64 Known problem? -Andi -- ak@xxxxxxxxxxxxxxx -- Speaking for myself only -- Crash-utility mailing list Crash-utility@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/crash-utility