[Bug threads/18127] threads spawned by infcall end up stuck in "running" state

["richard_sharman at mitel dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18127

Richard Sharman <richard_sharman at mitel dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |richard_sharman at mitel dot com

--- Comment #1 from Richard Sharman <richard_sharman at mitel dot com> ---
I have seen something similar:  when stopped at a breakpoint printing a
variable that has a [python] pretty printer (and scheduler-locking is off)
quite often other threads run before the printing is finished,  and if any of
these threads create other threads then these newly created threads -- and, for
some reason some existing threads --  appear as running.


The following shows a normal "into thread" with all threads stopped, but
after the print msg [a structure that contains a field that is pretty printed]
the info threads shows many threads running,  and not just the new ones.  At
this point we cannot continue.


(gdb) c
Continuing.
[New Thread 0xf70e3930 (LWP 7456)]
[Switching to Thread 0xf71a67b0 (LWP 7427)]

Breakpoint 1, ccsend (msg=...) at cgen/message0.cc:498
(gdb) info thread
  Id   Target Id         Frame 
  19   Thread 0xf70e3930 (LWP 7456) "McastAudit" 0xf7ffd430 in
__kernel_vsyscall ()
  18   Thread 0xf7105930 (LWP 7452) "McastAudit" 0xf7ffd430 in
__kernel_vsyscall ()
  17   Thread 0xf70ed7b0 (LWP 7453) "auditmgr       " 0xf7ffd430 in
__kernel_vsyscall ()
  16   Thread 0xf7134930 (LWP 7451) "McastAudit" 0xf7ffd430 in
__kernel_vsyscall ()
  15   Thread 0xf078d7b0 (LWP 7447) "debug_term     " 0xf7ffd430 in
__kernel_vsyscall ()
  14   Thread 0xf71527b0 (LWP 7448) "auditwork      " 0xf7ffd430 in
__kernel_vsyscall ()
  13   Thread 0xf7148930 (LWP 7449) "tSsuSrvHS" 0x0072b505 in dl_open_worker ()
from /lib/ld-linux.so.2
  12   Thread 0xf713e930 (LWP 7450) "McastAudit" 0xf7ffd430 in
__kernel_vsyscall ()
  11   Thread 0xf07977b0 (LWP 7446) "maint_term     " 0xf7ffd430 in
__kernel_vsyscall ()
  10   Thread 0xf7ffa7b0 (LWP 7441) "dbgmtterm      " 0xf7ffd430 in
__kernel_vsyscall ()
  9    Thread 0xf719c7b0 (LWP 7442) "cmsgsysin      " 0xf7ffd430 in
__kernel_vsyscall ()
  8    Thread 0xf71667b0 (LWP 7443) "auditmgr       " 0xf7ffd430 in
__kernel_vsyscall ()
  7    Thread 0xf715c930 (LWP 7444) "tMainApplQ" 0xf7ffd430 in
__kernel_vsyscall ()
  6    Thread 0xf13bc7b0 (LWP 7423) "dispatch       " 0xf7ffd430 in
__kernel_vsyscall ()
  5    Thread 0xf7ff07b0 (LWP 7424) "msgtimer       " DynArray<Array<unsigned
short, 0, 3> >::operator[] (
    this=0x99f2c46 <msgtimer_allocation>, index=4262) at
/home/gx5000/sharman/mpascaldir/d08/x86-linux/Array.h:180
  4    Thread 0xf7fe67b0 (LWP 7425) "guardian       " 0xf7ffd430 in
__kernel_vsyscall ()
  3    Thread 0xf71b07b0 (LWP 7426) "cleanup        " 0xf7ffd430 in
__kernel_vsyscall ()
* 2    Thread 0xf71a67b0 (LWP 7427) "sysinit        " ccsend (msg=...) at
cgen/message0.cc:498
  1    Thread 0xf7741a30 (LWP 7412) "cc" 0xf7ffd430 in __kernel_vsyscall ()
(gdb) p msg
$4 = (message &) @0xf71a5a3a: {control_byte = {msg_type = reg_msg, redun =
{sdrd = plane_0, rxrd = plane_0}}, tx_node = {
    group = 0 '\000', level = maincpu, {{subsystem_id = message_switch,
upper_id_byte = 0 '\000', lower_id_byte = 0 '\000'}, {
        cntrlr_no = 0 '\000', card_no = 0 '\000', circuit_no = 0 '\000'}}},
rx_node = {group = 0 '\000', level = maincpu, {{
        subsystem_id = message_switch, upper_id_byte = 0 '\000', lower_id_byte
= 0 '\000'}, {cntrlr_no = 0 '\000', 
        card_no = 0 '\000', circuit_no = 0 '\000'}}}, enter_lld_when_received =
0 '\000', [New Thread 0xf70d9930 (LWP 7457)]

  tx_sw = 0x70006  (7,6)        "sysinit   ", [New Thread 0xf70c5930 (LWP
7459)]
[New Thread 0xf70cf930 (LWP 7458)]
rx_sw = 0x7000d  (7,13) "auditmgr  ", tx_applic_id = nil_applic, 
  function_code = 13 '\r', data = {storage = "\002", '\000' <repeats 18
times>}, checksum = 0 '\000', icb = 0 '\000'}
(gdb) info thread
  Id   Target Id         Frame 
  22   Thread 0xf70cf930 (LWP 7458) "McastAudit" 0xf7ffd430 in
__kernel_vsyscall ()
  21   Thread 0xf70c5930 (LWP 7459) "SsuPeerSrvI" 0xf7ffd430 in
__kernel_vsyscall ()
  20   Thread 0xf70d9930 (LWP 7457) "McastAudit" (running)
  19   Thread 0xf70e3930 (LWP 7456) "McastAudit" (running)
  18   Thread 0xf7105930 (LWP 7452) "McastAudit" (running)
  17   Thread 0xf70ed7b0 (LWP 7453) "auditmgr       " (running)
  16   Thread 0xf7134930 (LWP 7451) "McastAudit" (running)
  15   Thread 0xf078d7b0 (LWP 7447) "debug_term     " (running)
  14   Thread 0xf71527b0 (LWP 7448) "auditwork      " (running)
  13   Thread 0xf7148930 (LWP 7449) "tSsuSrvHS" (running)
  12   Thread 0xf713e930 (LWP 7450) "McastAudit" (running)
  11   Thread 0xf07977b0 (LWP 7446) "maint_term     " (running)
  10   Thread 0xf7ffa7b0 (LWP 7441) "dbgmtterm      " (running)
  9    Thread 0xf719c7b0 (LWP 7442) "cmsgsysin      " (running)
  8    Thread 0xf71667b0 (LWP 7443) "auditmgr       " (running)
  7    Thread 0xf715c930 (LWP 7444) "tMainApplQ" (running)
  6    Thread 0xf13bc7b0 (LWP 7423) "dispatch       " (running)
  5    Thread 0xf7ff07b0 (LWP 7424) "msgtimer       " (running)
  4    Thread 0xf7fe67b0 (LWP 7425) "guardian       " (running)
  3    Thread 0xf71b07b0 (LWP 7426) "cleanup        " (running)
* 2    Thread 0xf71a67b0 (LWP 7427) "sysinit        " (running)
  1    Thread 0xf7741a30 (LWP 7412) "cc" (running)
(gdb) c
Continuing.
Cannot execute this command while the selected thread is running.
(gdb)

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