[Bug gdb/17283] New: gdbserver stops working in non-stop mode

["dilyan.palauzov at aegee dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17283

            Bug ID: 17283
           Summary: gdbserver stops working in non-stop mode
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: dilyan.palauzov at aegee dot org

I use gdb78 and gdbserver78.  When gdb is in non-stop mode, gdbserver
terminates with
../../../gdb-7.8/gdb/gdbserver/server.c:2695: A problem internal to GDBserver
has been detected.

I expect that gdbserver does not terminate, or at least gdb warns, that doing
remote non-stop will lead to gdbserver termination.

Moreover, I expect that target remote can be run async:
  target remote   -- stops the program, after connecting to remove
  target remote & -- doesn't stop the program (implies continue&)

# gdbserver --debug --debug-format=timestamp,all --attach :1234 21936 2>
gdb-stderr

# gdb ./prog

(gdb) set non-stop on
(gdb) show architecture
The target architecture is set automatically (currently i386:x86-64)
(gdb) target remote localhost:1234 
Remote debugging using localhost:1234
Remote connection closed
(qdb) quit

# cat gdb-stderr
sigchld_handler
1408277153:183341 Found new lwp 21937
sigchld_handler
1408277153:183464 Found new lwp 28894
sigchld_handler
1408277153:183584 Found new lwp 28968
sigchld_handler
Attached; pid = 21936
1408277153:183747 >>>> entering linux_wait_1
1408277153:183774 linux_wait_1: [Process 21936]
my_waitpid (-1, 0x40000001)
my_waitpid (-1, 0x1): status(137f), 21936
1408277153:183828 LWFE: waitpid(-1, ...) returned 21936, ERRNO-OK
1408277153:183872 LLW: waitpid 21936 received Stopped (signal) (stopped)
1408277153:183976 linux_low_filter_event: pc is 0x7fe35ea42633
1408277153:183995 pc is 0x7fe35ea42633
1408277153:184014 stop pc is 0x7fe35ea42633
my_waitpid (29340, 0x0)
my_waitpid (29340, 0x0): status(137f), 29340
my_waitpid (29340, 0x0)
my_waitpid (29340, 0x0): status(1057f), 29340
my_waitpid (29341, 0x0)
my_waitpid (29341, 0x0): status(137f), 29341
my_waitpid (29341, 0x0)
my_waitpid (29341, 0x0): status(9), 29341
my_waitpid (29340, 0x0)
my_waitpid (29340, 0x0): status(0), 29340
1408277153:184887 Expected stop.
sigchld_handler
1408277153:184930 Hit a non-gdbserver trap event.
1408277153:184950 >>>> entering stop_all_lwps
1408277153:184967 stop_all_lwps (stop, except=none)
1408277153:184988 Have pending sigstop for lwp 21937
1408277153:185008 Have pending sigstop for lwp 28894
1408277153:185025 Have pending sigstop for lwp 28968
1408277153:185045 wait_for_sigstop: pulling events
my_waitpid (-1, 0x40000001)
my_waitpid (-1, 0x80000001): status(137f), 28968
1408277153:185084 LWFE: waitpid(-1, ...) returned 28968, ERRNO-OK
1408277153:185108 LLW: waitpid 28968 received Stopped (signal) (stopped)
1408277153:185167 linux_low_filter_event: pc is 0x7fe35ea42633
1408277153:185186 pc is 0x7fe35ea42633
1408277153:185203 stop pc is 0x7fe35ea42633
1408277153:185219 Expected stop.
my_waitpid (-1, 0x40000001)
my_waitpid (-1, 0x80000001): status(137f), 28894
1408277153:185250 LWFE: waitpid(-1, ...) returned 28894, ERRNO-OK
1408277153:185267 LLW: waitpid 28894 received Stopped (signal) (stopped)
1408277153:185307 linux_low_filter_event: pc is 0x7fe35ea42633
1408277153:185324 pc is 0x7fe35ea42633
1408277153:185339 stop pc is 0x7fe35ea42633
1408277153:185356 Expected stop.
my_waitpid (-1, 0x40000001)
my_waitpid (-1, 0x80000001): status(137f), 21937
1408277153:185387 LWFE: waitpid(-1, ...) returned 21937, ERRNO-OK
1408277153:185403 LLW: waitpid 21937 received Stopped (signal) (stopped)
1408277153:185442 linux_low_filter_event: pc is 0x7fe35f436009
1408277153:185459 pc is 0x7fe35f436009
1408277153:185473 stop pc is 0x7fe35f436009
1408277153:185488 Expected stop.
my_waitpid (-1, 0x40000001)
my_waitpid (-1, 0x80000001): status(137f), 0
1408277153:185522 LWFE: waitpid(-1, ...) returned 0, ERRNO-OK
1408277153:185628 leader_pid=21936, leader_lp!=NULL=1, num_lwps=4, zombie=0
1408277153:185704 LLW: exit (no unwaited-for LWP)
1408277153:185720 stop_all_lwps done, setting stopping_threads back to
!stopping
1408277153:185732 <<<< exiting stop_all_lwps
1408277153:185750 Checking whether LWP 21936 needs to move out of the jump
pad...no
1408277153:185766 Checking whether LWP 21937 needs to move out of the jump
pad...no
1408277153:185780 Checking whether LWP 28894 needs to move out of the jump
pad...no
1408277153:185795 Checking whether LWP 28968 needs to move out of the jump
pad...no
1408277153:185815 linux_wait_1 ret = LWP 21936.21936, 1, 0
1408277153:185829 <<<< exiting linux_wait_1
Listening on port 1234
1408277224:689906 handling possible accept event
Remote debugging from host 127.0.0.1
1408277224:690036 linux_async (0), previous=0
1408277224:690069 handling possible serial event
sigchld_handler
sigchld_handler
1408277224:690983 handling possible serial event
1408277224:691120 handling possible serial event
1408277224:691247 handling possible serial event
1408277224:691355 handling possible serial event
1408277224:691832 handling possible serial event
1408277224:692877 handling possible serial event
1408277224:693735 handling possible serial event
1408277224:696486 handling possible serial event
1408277224:696650 handling possible serial event
1408277224:696676 linux_async (1), previous=0
1408277224:696762 handling possible target event
1408277224:696796 >>>> entering linux_wait_1
1408277224:696817 linux_wait_1: [<all threads>]
my_waitpid (-1, 0x40000001)
my_waitpid (-1, 0x80000001): status(30), 0
1408277224:696850 LWFE: waitpid(-1, ...) returned 0, ERRNO-OK
1408277224:696942 leader_pid=21936, leader_lp!=NULL=1, num_lwps=4, zombie=0
1408277224:697002 LLW: exit (no unwaited-for LWP)
1408277224:697015 linux_wait_1 ret = null_ptid, TARGET_WAITKIND_NO_RESUMED
1408277224:697027 <<<< exiting linux_wait_1
1408277224:697044 handling possible serial event
1408277224:697517 handling possible serial event
1408277224:697650 handling possible serial event
1408277224:697739 handling possible serial event
1408277224:697765 >>>> entering linux_resume
1408277224:697779 linux_resume:
1408277224:697791 already stopped LWP 21936 at GDB's request
1408277224:697805 Need step over [LWP 21936]? Ignoring, should remain stopped
1408277224:697817 Need step over [LWP 21937]? No
1408277224:697857 pc is 0x7fe35f436009
1408277224:697875 Need step over [LWP 21937]? No, no breakpoint found at
0x7fe35f436009
1408277224:697888 Need step over [LWP 28894]? No
1408277224:697920 pc is 0x7fe35ea42633
1408277224:697935 Need step over [LWP 28894]? No, no breakpoint found at
0x7fe35ea42633
1408277224:697947 Need step over [LWP 28968]? No
1408277224:697978 pc is 0x7fe35ea42633
1408277224:697993 Need step over [LWP 28968]? No, no breakpoint found at
0x7fe35ea42633
1408277224:698005 Resuming, no pending status or step over needed
1408277224:698016 linux_resume done
1408277224:698027 <<<< exiting linux_resume
1408277224:698125 handling possible serial event
1408277224:698151 Returning trace status as 0, stop reason tnotrun
1408277224:698259 handling possible serial event
1408277224:698280 Returning first trace state variable definition
1408277224:698361 handling possible serial event
1408277224:698382 Returning additional trace state variable definition
1408277224:698466 handling possible serial event
1408277224:698496 Reporting thread LWP 21936.21936 as already stopped with
status->kind = stopped, signal = GDB_SIGNAL_0
1408277224:698513 Reporting thread LWP 21936.21937 as already stopped with
status->kind = ignore
../../../gdb-7.8/gdb/gdbserver/server.c:2695: A problem internal to GDBserver
has been detected.
queue_stop_reply_callback: Assertion `thread->last_status.kind !=
TARGET_WAITKIND_IGNORE' failed.

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