[Bug remote/27927] gdb crash with OpenOCD

["simark at simark dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27927

Simon Marchi <simark at simark dot ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-06-02
     Ever confirmed|0                           |1

--- Comment #12 from Simon Marchi <simark at simark dot ca> ---
Thanks for the instructions, I can reproduce.

I guess we don't have the same netcat (mine is GNU netcat 0.7.1), as I needed
to use "nc -l -p 3333", without the -p I think the "3333" is interpreted as a
hostname.

However, I was able to reproduce by piping the file (<) in netcat.

This is the output of "set debug remote 1":

(gdb) tar ext :3333
Remote debugging using :3333
[remote] start_remote: enter
  [remote] Sending packet:
$qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;memory-tagging+;xmlRegisters=i386#77
  [remote] Received Ack
  [remote] Packet received:
PacketSize=4000;qXfer:memory-map:read+;qXfer:features:read+;qXfer:threads:read+;QStartNoAckMode+;vContSupported+
  [remote] packet_ok: Packet qSupported (supported-packets) is supported
  [remote] Sending packet: $vMustReplyEmpty#3a
  [remote] Received Ack
  [remote] Packet received: 
  [remote] Sending packet: $QStartNoAckMode#b0
  [remote] Received Ack
  [remote] Packet received: OK
  [remote] Sending packet: $!#21
  [remote] Packet received: OK
  [remote] Sending packet: $Hg0#df
  [remote] Packet received: OK
  [remote] Sending packet: $qXfer:features:read:target.xml:0,1000#0c
  [remote] Packet received: l<?xml version="1.0"?>\n<!DOCTYPE target SYSTEM
"gdb-target.dtd">\n<target
version="1.0">\n<architecture>arm</architecture>\n<feature
name="org.gnu.gdb.arm.m-profile">\n<reg name="r0" bitsize="32" regnum="0"
save-restore="yes" type="int" group="general"/>\n<reg name="r1" bitsize="32"
regnum="1" save-restore="yes" type="int" group="general"/>\n<reg name="r2"
bitsize="32" regnum="2" save-restore="yes" type="int" group="general"/>\n<reg
name="r3" bitsize="32" regnum="3" save-restore="yes" type="int"
group="general"/>\n [3430 bytes omitted]
  [remote] Sending packet: $qTStatus#49
  [remote] Packet received: 
  [remote] packet_ok: Packet qTStatus (trace-status) is NOT supported
  [remote] Sending packet: $?#3f
  [remote] Packet received: S02
  [remote] Sending packet: $qXfer:threads:read::0,1000#92
  [remote] Packet received: l<?xml version="1.0"?>\n<threads>\n<thread
id="1">Name: Kernel's Stat Task, State: Delay, Priority: 6</thread>\n<thread
id="2">Name: Wi-SUN MAC, State: Pend, Priority: 31</thread>\n<thread
id="3">Name: Wi-SUN Timer Task, State: Pend, Priority: 10</thread>\n<thread
id="4">Name: Wi-SUN Event Loop Task, State: Pend, Priority:
12</thread>\n<thread id="5">Name: Wi-SUN RF Task, State: Pend, Priority:
9</thread>\n</threads>\n
  [remote] Sending packet: $qAttached#8f
  [remote] Packet received: 1
  [remote] packet_ok: Packet qAttached (query-attached) is supported
warning: No executable has been specified and target does not support
determining executable automatically.  Try using the "file" command.
  [remote] Sending packet: $Hc-1#09
  [remote] Packet received: OK
  [remote] Sending packet: $qC#b4
  [remote] Packet received: QC0000000000000000
/home/simark/src/binutils-gdb/gdb/thread.c:1345: internal-error: void
switch_to_thread(thread_info*): Assertion `thr != NULL' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) 

And the backtrace:

#9  0x000055c505df2fe6 in internal_error (file=0x55c5065a3840
"/home/simark/src/binutils-gdb/gdb/thread.c", line=1345, fmt=0x55c5065a3220
"%s: Assertion `%s' failed.") at
/home/simark/src/binutils-gdb/gdbsupport/errors.cc:55
#10 0x000055c504a24f70 in switch_to_thread (thr=0x0) at
/home/simark/src/binutils-gdb/gdb/thread.c:1345
#11 0x000055c50460c4d2 in remote_target::start_remote (this=0x617000033700,
from_tty=1, extended_p=1) at /home/simark/src/binutils-gdb/gdb/remote.c:4860
#12 0x000055c50460ffe8 in remote_target::open_1 (name=0x60200007c338 ":3333",
from_tty=1, extended_p=1) at /home/simark/src/binutils-gdb/gdb/remote.c:5771
#13 0x000055c50460ce9d in extended_remote_target::open (name=0x60200007c338
":3333", from_tty=1) at /home/simark/src/binutils-gdb/gdb/remote.c:5004
#14 0x000055c5049c59fa in open_target (args=0x60200007c338 ":3333", from_tty=1,
command=0x611000065300) at /home/simark/src/binutils-gdb/gdb/target.c:847

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