id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	blockedby	blocking	branch_state	votes
4071	Sometimes mc hangs on directory change	olfway		"I use mc 4.8.24 on mac os 10.15.3

{{{
❯ env LC_MESSAGES=C /opt/mc/bin/mc -V
GNU Midnight Commander unknown
Built with GLib 2.64.1
Using the S-Lang library with terminfo database
With builtin Editor
With subshell support as default
With support for background operations
With mouse support on xterm
With internationalization support
With multiple codepages support
Virtual File Systems: cpiofs, tarfs, sfs, extfs, ftpfs, fish
Data types: char: 8; int: 32; long: 64; void *: 64; size_t: 64; off_t: 64;
}}}


{{{
❯ /opt/mc//bin/mc --configure-options
 '--prefix' '/opt/mc' '--without-x' '--with-screen=slang' '--disable-doxygen-html' '--disable-doxygen-dot' '--disable-doxygen-doc' 'CFLAGS=-O0 -g -ggdb' 'LDFLAGS=-L/usr/local/opt/gettext/lib -L/usr/local/opt/gettext/lib' 'CPPFLAGS=-I/usr/local/opt/gettext/include -I/usr/local/opt/gettext/include'
}}}


fish shell, version 3.1.0

Sometimes, then I press enter to change directory mc just hangs.
Also, there is a zombie kill process after that

Backtrace from mc:

 
{{{
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
  * frame #0: 0x00007fff73a3a3b2 libsystem_kernel.dylib`__sigsuspend + 10
    frame #1: 0x00000001002f9394 mc`synchronize at common.c:497:9
    frame #2: 0x00000001002f81ba mc`feed_subshell(how=0, fail_on_error=0) at common.c:609:13
    frame #3: 0x00000001002f87e8 mc`do_subshell_chdir(vpath=0x00007fa164c0f8b0, update_prompt=0) at common.c:1345:5
    frame #4: 0x0000000100276299 mc`subshell_chdir(vpath=0x00007fa164c0f8b0) at panel.c:3234:9
    frame #5: 0x00000001002745f6 mc`_do_panel_cd(panel=0x00007fa164c0ec70, new_dir_vpath=0x00007fa164c0f570, cd_type=cd_exact) at panel.c:3275:5
    frame #6: 0x00000001002744e3 mc`do_panel_cd(panel=0x00007fa164c0ec70, new_dir_vpath=0x00007fa164c0f570, cd_type=cd_exact) at panel.c:4628:9
    frame #7: 0x00000001002758be mc`do_cd(new_dir_vpath=0x00007fa164c0f570, exact=cd_exact) at panel.c:5028:11
    frame #8: 0x0000000100279e76 mc`do_enter_on_file_entry(fe=0x00000001008670b8) at panel.c:2795:14
    frame #9: 0x000000010027865e mc`do_enter(panel=0x00007fa164c0ec70) at panel.c:2855:12
    frame #10: 0x00000001002765c1 mc`panel_execute_cmd(panel=0x00007fa164c0ec70, command=1) at panel.c:3446:9
    frame #11: 0x00000001002763f4 mc`panel_key(panel=0x00007fa164c0ec70, key=10) at panel.c:3608:20
    frame #12: 0x0000000100272655 mc`panel_callback(w=0x00007fa164c0ec70, sender=0x0000000000000000, msg=MSG_KEY, parm=10, data=0x0000000000000000) at panel.c:3688:16
    frame #13: 0x000000010023075a mc`send_message(w=0x00007fa164c0ec70, sender=0x0000000000000000, msg=MSG_KEY, parm=10, data=0x0000000000000000) at widget-common.h:216:15
    frame #14: 0x0000000100231a16 mc`dlg_key_event(h=0x00007fa164f05d90, d_key=10) at dialog.c:489:19
    frame #15: 0x0000000100231439 mc`dlg_process_event(h=0x00007fa164f05d90, key=10, event=0x00007ffeef9f5640) at dialog.c:1134:9
    frame #16: 0x0000000100231d48 mc`frontend_dlg_run(h=0x00007fa164f05d90) at dialog.c:545:9
    frame #17: 0x0000000100231b8e mc`dlg_run(h=0x00007fa164f05d90) at dialog.c:1167:5
    frame #18: 0x000000010026d8ed mc`do_nc at midnight.c:1836:16
    frame #19: 0x000000010020bb92 mc`main(argc=1, argv=0x00007ffeef9f5808) at main.c:405:21
    frame #20: 0x00007fff738d97fd libdyld.dylib`start + 1
    frame #21: 0x00007fff738d97fd libdyld.dylib`start + 1
(lldb) frame variable
(lldb) up
frame #1: 0x00000001002f9394 mc`synchronize at common.c:497:9
   494
   495 	    /* Wait until the subshell has stopped */
   496 	    while (subshell_alive && !subshell_stopped)
-> 497 	        sigsuspend (&old_mask);
   498
   499 	    if (subshell_state != ACTIVE)
   500 	    {
(lldb) frame variable
(sigset_t) sigchld_mask = 524288
(sigset_t) old_mask = 0

}}}


Backtrace from fish (part of):

{{{
frame #2: 0x00000001012380fe fish`exec_external_command(parser=0x00007fb2e2d02030, j=std::__1::shared_ptr<job_t>::element_type @ 0x00007fb2e2f0f3c8 strong=2 weak=1, p=0x00007fb2e2f0f530, proc_io_chain=0x00007ffeeeb43930) at exec.cpp:573:17
   570 	            // We successfully made the attributes and actions; actually call
   571 	            // posix_spawn.
   572 	            int spawn_ret =
-> 573 	                posix_spawn(&pid, actual_cmd, &actions, &attr, const_cast<char *const *>(argv),
   574 	                            const_cast<char *const *>(envv));
   575
   576 	            // This usleep can be used to test for various race conditions

(const char *) actual_cmd = 0x00007ffeeeb435d1 ""/bin/kill""
}}}
"	defect	new	major	Future Releases	mc-core	4.8.24						no branch