提交: cf6f3e86ded2cd950f59a0f2c164f2c953ef534b - binutils_os216 (git)

GNU Binutils with patches for OS216

Commit MetaInfo

• 修訂: cf6f3e86ded2cd950f59a0f2c164f2c953ef534b (tree)
• 時間: 2020-06-22 01:32:27
• 作者: Rainer Orth <ro@CeBi...>
• Commiter: Rainer Orth

Log Message

[PR gdb/25939] Move push_target call earlier in procfs.c

Since the multi-target patch, the run command fails on Solaris with an
assertion failure even for a trivial program:

$ ./gdb -D ./data-directory ./hello
GNU gdb (GDB) 10.0.50.20200106-git
[...]
Reading symbols from ./hello...
(gdb) run
Starting program: /vol/obj/gnu/gdb/gdb/reghunt/no-resync/122448/gdb/hello
/vol/src/gnu/gdb/hg/master/reghunt/gdb/thread.c:336: internal-error:
thread_info::thread_info(inferior*, ptid_t): Assertion inf_ != NULL'
failed.

Here's the start of the corresponding stack trace:

#0 internal_error (

file=file@entry=0x966150

"/vol/src/gnu/gdb/hg/master/reghunt/gdb/thread.c", line=line@entry=336,
fmt=0x9ddb94 "%s: Assertion %s' failed.")

at /vol/src/gnu/gdb/hg/master/reghunt/gdb/gdbsupport/errors.c:51

#1 0x0000000000ef81f4 in thread_info::thread_info (this=0x1212020,

inf_=<optimized out>, ptid_=...)
at /vol/src/gnu/gdb/hg/master/reghunt/gdb/thread.c:344

#2 0x0000000000ef82cd in new_thread (inf=inf@entry=0x0, ptid=...)

at /vol/src/gnu/gdb/hg/master/reghunt/gdb/thread.c:239

#3 0x0000000000efac3c in add_thread_silent (

targ=targ@entry=0x11b0940 <the_procfs_target>, ptid=...)
at /vol/src/gnu/gdb/hg/master/reghunt/gdb/thread.c:304

#4 0x0000000000d90692 in procfs_target::create_inferior (

this=0x11b0940 <the_procfs_target>,
exec_file=0x13dbef0

"/vol/obj/gnu/gdb/gdb/reghunt/no-resync/122448/gdb/hello", allargs="",
env=0x13c48f0, from_tty=<optimized out>)

at /vol/src/gnu/gdb/hg/master/reghunt/gdb/gdbsupport/ptid.h:47

#5 0x0000000000c84e64 in run_command_1 (args=<optimized out>, from_tty=1,

run_how=run_how@entry=RUN_NORMAL)
at /vol/gcc-9/include/c++/9.1.0/bits/basic_string.h:263

#6 0x0000000000c85007 in run_command (args=<optimized out>,

from_tty=<optimized out>)
at /vol/src/gnu/gdb/hg/master/reghunt/gdb/infcmd.c:687

Looking closer, I found that in add_thread_silent as called from
procfs.c (procfs_target::create_inferior) find_inferior_ptid returns
NULL. The all_inferiors (targ) iterator comes up empty.

Going from there, I see that in add_thread_silent

m_target_stack = {m_top = file_stratum, m_stack = {0x20190e0
<the_dummy_target>, 0x200b8c0 <exec_ops>, 0x0, 0x0, 0x0, 0x0, 0x0}}}

i.e. the_procfs_target is missing compared to the_amd64_linux_nat_target
on Linux/x86_64.

Moving the push_target call earlier allows debugging to get over the
initial assertion failure. I run instead into

procfs: couldn't find pid 0 in procinfo list.

which is fixed by

https://sourceware.org/pipermail/gdb-patches/2020-June/169674.html

Both patches tested together on amd64-pc-solaris2.11.

PR gdb/25939
* procfs.c (procfs_target::procfs_init_inferior): Move push_target
call ...
(procfs_target::create_inferior): ... here.

Change Summary

• modified: gdb/ChangeLog
• modified: gdb/procfs.c

差異

--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,10 @@
[phone]  Rainer Orth  <[e-mail]>
+
+	PR gdb/25939
+	* procfs.c (procfs_target::procfs_init_inferior): Move push_target
+	call ...
+	(procfs_target::create_inferior): ... here.
+
 2020-06-21  Philippe Waroquiers  <[e-mail]>
 
 	* exec.c (validate_exec_file): Ensure the build-id is up to

--- a/gdb/procfs.c
+++ b/gdb/procfs.c
@@ -2781,11 +2781,6 @@ procfs_target::procfs_init_inferior (int pid)
   int fail;
   int lwpid;
 
-  /* This routine called on the parent side (GDB side)
-     after GDB forks the inferior.  */
-  if (!target_is_pushed (this))
-    push_target (this);
-
   pi = create_procinfo (pid, 0);
   if (pi == NULL)
     perror (_("procfs: out of memory in 'init_inferior'"));
@@ -3006,6 +3001,9 @@ procfs_target::create_inferior (const char *exec_file,
       shell_file = tryname;
     }
 
+  if (!target_is_pushed (this))
+    push_target (this);
+
   pid = fork_inferior (exec_file, allargs, env, procfs_set_exec_trap,
 		       NULL, NULL, shell_file, NULL);