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Date:	Tue, 1 Jul 2025 16:14:37 -0700 (PDT)
X-X-Sender:	jeremyd AT resin DOT csoft DOT net
To:	cygwin AT cygwin DOT com
Subject:	issues debugging crash in cygwin dll with gdb
Message-ID:	<7a97c9a4-43bd-37ef-bde2-5f8e5abd29b4@jdrake.com>
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From:	Jeremy Drake via Cygwin <cygwin AT cygwin DOT com>
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I had an issue in some code I was working on in Cygwin, which resulted in
a segfault in the Cygwin dll.  It did not work out well though, the
process exited with code 0.  Attempting to debug with gdb gave
[Thread 25728.0x6e60 exited with code 3221225477]
[Thread 25728.0x33c0 exited with code 3221225477]
[Thread 25728.0x6b44 exited with code 3221225477]
[Thread 25728.0x5508 exited with code 3221225477]

Program terminated with signal SIGTRAP, Trace/breakpoint trap.
The program no longer exists.


The fact that it said SIGTRAP led me to think about the recent single step
change.

with strace it looks like
--- Process 8384 (pid: 1650), exception c0000005 at 00007ffbd75f8909
 3440  305925 [main] ninja 1650 exception::handle: In cygwin_except_handler exception 0xC0000005 at 0x7FFBD75F8909 sp 0x7FFFFC030
   98  306023 [main] ninja 1650 exception::handle: In cygwin_except_handler signal 11 at 0x7FFBD75F8909
   71  306094 [main] ninja 1650 break_here: break here
   49  306143 [main] ninja 1650 sig_send: sendsig 0x160, pid 1650, signal 11, its_me 1
   53  306196 [main] ninja 1650 sig_send: wakeup 0x234
   61  306257 [main] ninja 1650 sig_send: Waiting for pack.wakeup 0x234
   55  306312 [sig] ninja 1650 sigpacket::process: signal 11 processing
   52  306364 [sig] ninja 1650 sigpacket::process: signal 11, signal handler 0x7FFBD7590DB0
   49  306413 [sig] ninja 1650 sigpacket::setup_handler: controlled interrupt. stackptr 0x7FFFFE2B0, stack 0x7FFFFE2A8, stackptr[-1] 0x100427CCF
   55  306468 [sig] ninja 1650 proc_subproc: args: 4, 1
   50  306518 [sig] ninja 1650 proc_subproc: clear waiting threads
   49  306567 [sig] ninja 1650 proc_subproc: finished clearing
   49  306616 [sig] ninja 1650 proc_subproc: returning 1
   48  306664 [sig] ninja 1650 _cygtls::interrupt_setup: armed signal_arrived 0x238, signal 11
   48  306712 [sig] ninja 1650 sigpacket::setup_handler: signal 11 delivered
   49  306761 [sig] ninja 1650 sigpacket::process: returning 1
   49  306810 [sig] ninja 1650 wait_sig: signalling pack.wakeup 0x234
   56  306866 [main] ninja 1650 set_process_mask_delta: oldmask 4003, newmask 4003, deltamask 0
   51  306917 [main] ninja 1650 signal_exit: exiting due to signal 11
   49  306966 [main] ninja 1650 break_here: break here
   50  307016 [main] ninja 1650 signal_exit: about to call do_exit (B)
   48  307064 [main] ninja 1650 do_exit: do_exit (11), exit_state 2
   49  307113 [main] ninja 1650 void: 0x0 = signal (20, 0x1)
   53  307166 [main] ninja 1650 void: 0x100427B70 = signal (1, 0x1)
   78  307244 [main] ninja 1650 void: 0x100427B70 = signal (2, 0x1)
   70  307314 [main] ninja 1650 void: 0x0 = signal (3, 0x1)
<bunch of closes that are probably not relevant>
--- Process 8384 (pid: 1650), exception c0000005 at 00007ffbd75fe7dc
--- Process 8384 (pid: 1650) thread 21484 exited with status 0xc0000005
--- Process 8384 thread 19480 exited with status 0xc0000005
--- Process 8384 thread 17180 exited with status 0xc0000005
--- Process 8384 thread 26744 exited with status 0xc0000005
--- Process 8384 exited with status 0xc0000005
Segmentation fault

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