86 lines
3.3 KiB
Diff
86 lines
3.3 KiB
Diff
http://sourceware.org/ml/gdb-patches/2009-10/msg00142.html
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Subject: [patch] Fix GNU/Linux core open: Can't read pathname for load map: Input/output error.
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Hi,
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GDB currently always prints on loading a core file:
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warning: Can't read pathname for load map: Input/output error.
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The patch is not nice but it was WONTFIXed on the glibc side in:
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http://sourceware.org/ml/libc-alpha/2009-10/msg00001.html
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The same message in GDB PR 8882 and glibc PR 387 was for ld-linux.so.2 l_name
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but that one is now ignored thanks to IGNORE_FIRST_LINK_MAP_ENTRY.
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This fix is intended for Linux system vDSO l_name which is a second entry in
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the DSO list.
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Regression tested on {x86_86,x86_64-m32,i686}-fedora11-linux-gnu.
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Thanks,
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Jan
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gdb/
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2009-10-06 Jan Kratochvil <jan.kratochvil@redhat.com>
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Do not print false warning on reading core file with vDSO on GNU/Linux.
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* solib-svr4.c (svr4_current_sos): Suppress the warning if
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MASTER_SO_LIST is still NULL.
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* solib.c (update_solib_list): New variable saved_so_list_head.
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Conditionally restart the function.
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[ Context backport. ]
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Index: gdb-7.3.50.20110722/gdb/solib-svr4.c
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===================================================================
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--- gdb-7.3.50.20110722.orig/gdb/solib-svr4.c 2011-07-22 19:26:46.000000000 +0200
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+++ gdb-7.3.50.20110722/gdb/solib-svr4.c 2011-07-22 19:29:36.000000000 +0200
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@@ -1197,8 +1197,18 @@ svr4_current_sos (void)
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target_read_string (lm_name (new), &buffer,
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SO_NAME_MAX_PATH_SIZE - 1, &errcode);
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if (errcode != 0)
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- warning (_("Can't read pathname for load map: %s."),
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- safe_strerror (errcode));
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+ {
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+ /* During the first ever DSO list reading some strings may be
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+ unreadable as residing in the ld.so readonly memory not being
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+ present in a dumped core file. Delay the error check after
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+ the first pass of DSO list scanning when ld.so should be
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+ already mapped in and all the DSO list l_name memory gets
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+ readable. */
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+
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+ if (master_so_list () != NULL)
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+ warning (_("Can't read pathname for load map: %s."),
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+ safe_strerror (errcode));
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+ }
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else
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{
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struct build_id *build_id;
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Index: gdb-7.3.50.20110722/gdb/solib.c
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===================================================================
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--- gdb-7.3.50.20110722.orig/gdb/solib.c 2011-06-30 21:29:54.000000000 +0200
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+++ gdb-7.3.50.20110722/gdb/solib.c 2011-07-22 19:29:10.000000000 +0200
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@@ -706,6 +706,7 @@ update_solib_list (int from_tty, struct
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struct target_so_ops *ops = solib_ops (target_gdbarch);
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struct so_list *inferior = ops->current_sos();
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struct so_list *gdb, **gdb_link;
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+ struct so_list *saved_so_list_head = so_list_head;
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/* We can reach here due to changing solib-search-path or the
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sysroot, before having any inferior. */
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@@ -846,6 +847,12 @@ update_solib_list (int from_tty, struct
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observer_notify_solib_loaded (i);
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}
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+ /* If this was the very first DSO list scan and we possibly read in ld.so
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+ recheck all the formerly unreadable DSO names strings. */
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+
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+ if (saved_so_list_head == NULL && so_list_head != NULL)
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+ return update_solib_list (from_tty, target);
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+
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/* If a library was not found, issue an appropriate warning
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message. We have to use a single call to warning in case the
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front end does something special with warnings, e.g., pop up
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