[Bug 1814905] Re: dash exits when receiving wall message
[Expired for dash (Ubuntu) because there has been no activity for 60 days.] ** Changed in: dash (Ubuntu) Status: Incomplete => Expired -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814905 Title: dash exits when receiving wall message To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dash/+bug/1814905/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814905] Re: dash exits when receiving wall message
Here's a quick demonstration with Ubuntu 18.10 desktop, fresh install in a VirtualBox VM, up-to-date https://youtu.be/-VSj_ZZjv3w (1min screen capture) with and without strace. I've also attached a perf trace output. I've started /bin/sh as root like this: perf trace -o /tmp/dash-perf-trace.txt /bin/sh Pressed a couple of enters, did an echo, and then a "wall foo" from another terminal, as normal user. I'm not saying it's dash's fault, I just didn't know where to open the ticket. Please let me know if you need anything else. Thanks! ** Attachment added: "dash-perf-trace.txt" https://bugs.launchpad.net/ubuntu/+source/dash/+bug/1814905/+attachment/5236686/+files/dash-perf-trace.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814905 Title: dash exits when receiving wall message To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dash/+bug/1814905/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814905] Re: dash exits when receiving wall message
Hello Imre, thanks for the report. I can't reproduce this issue myself,
nor could I find anything in the source code that would suggest dash
would try to quit. In fact I'm not even sure that dash knows that it's
happened.
Here's the tail end of strace output (run on the same terminal as dash,
to force intermingling of syscall output and terminal output), showing
dash handling a write(1) without trouble, and checking for completed
jobs after I hit enter several times:
geteuid() = 1000
getegid() = 1000
rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGINT, {sa_handler=0x55a82089e200, sa_mask=~[RTMIN RT_1],
sa_flags=SA_RESTORER, sa_restorer=0x7fd3be19df20}, NULL, 8) = 0
rt_sigaction(SIGQUIT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGQUIT, {sa_handler=SIG_IGN, sa_mask=~[RTMIN RT_1],
sa_flags=SA_RESTORER, sa_restorer=0x7fd3be19df20}, NULL, 8) = 0
rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGTERM, {sa_handler=SIG_IGN, sa_mask=~[RTMIN RT_1],
sa_flags=SA_RESTORER, sa_restorer=0x7fd3be19df20}, NULL, 8) = 0
openat(AT_FDCWD, "/dev/tty", O_RDWR)= 3
fcntl(3, F_DUPFD, 10) = 10
close(3)= 0
fcntl(10, F_SETFD, FD_CLOEXEC) = 0
ioctl(10, TIOCGPGRP, [23306]) = 0
getpgrp() = 23306
rt_sigaction(SIGTSTP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGTSTP, {sa_handler=SIG_IGN, sa_mask=~[RTMIN RT_1],
sa_flags=SA_RESTORER, sa_restorer=0x7fd3be19df20}, NULL, 8) = 0
rt_sigaction(SIGTTOU, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGTTOU, {sa_handler=SIG_IGN, sa_mask=~[RTMIN RT_1],
sa_flags=SA_RESTORER, sa_restorer=0x7fd3be19df20}, NULL, 8) = 0
rt_sigaction(SIGTTIN, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGTTIN, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1],
sa_flags=SA_RESTORER, sa_restorer=0x7fd3be19df20}, NULL, 8) = 0
setpgid(0, 23308) = 0
ioctl(10, TIOCSPGRP, [23308]) = 0
wait4(-1, 0x7ffcdf89717c, WNOHANG|WSTOPPED, NULL) = -1 ECHILD (No child
processes)
write(2, "$ ", 2$ ) = 2
read(0,
Message from sarnold@hunt on pts/13 at 17:41 ...
hello
EOF
"\n", 8192) = 1
wait4(-1, 0x7ffcdf89717c, WNOHANG|WSTOPPED, NULL) = -1 ECHILD (No child
processes)
write(2, "$ ", 2$ ) = 2
read(0,
"\n", 8192) = 1
wait4(-1, 0x7ffcdf89717c, WNOHANG|WSTOPPED, NULL) = -1 ECHILD (No child
processes)
write(2, "$ ", 2$ ) = 2
read(0, ^C0x55a820aa9a60, 8192) = ? ERESTARTSYS (To be restarted if
SA_RESTART is set)
--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
rt_sigprocmask(SIG_SETMASK, [], ~[KILL STOP RTMIN RT_1], 8) = 0
write(2, "\n", 1
) = 1
wait4(-1, 0x7ffcdf89717c, WNOHANG|WSTOPPED, NULL) = -1 ECHILD (No child
processes)
write(2, "$ ", 2$ ) = 2
read(0, "", 8192) = 0
write(2, "\n", 1
) = 1
ioctl(10, TIOCSPGRP, [23306]) = 0
setpgid(0, 23306) = 0
close(10) = 0
exit_group(0) = ?
+++ exited with 0 +++
I tried both dash in a terminal (urxvt) and ssh -t sarnold@localhost /bin/dash
-- both behaved identically.
Could you try to reproduce this while you're attached to the shell with
gdb or perhaps perf trace?
Thanks
** Changed in: dash (Ubuntu)
Status: New => Incomplete
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Title:
dash exits when receiving wall message
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[Bug 1814905] Re: dash exits when receiving wall message
** Package changed: ubuntu => dash (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814905 Title: dash exits when receiving wall message To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dash/+bug/1814905/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814905] Re: dash exits when receiving wall message
Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode. To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1814905/+editstatus and add the package name in the text box next to the word Package. [This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.] ** Tags added: bot-comment -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814905 Title: dash exits when receiving wall message To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1814905/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814905] Re: dash exits when receiving wall message
** Attachment added: "strace-good.txt" https://bugs.launchpad.net/ubuntu/+bug/1814905/+attachment/5236366/+files/strace-good.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814905 Title: dash exits when receiving wall message To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1814905/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814905] Re: dash exits when receiving wall message
I've attached two straces, -bad when dash exits after receiving a wall message, and good when dash does NOT exit after a wall, only after I press Ctrl+D. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814905 Title: dash exits when receiving wall message To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1814905/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814905] Re: dash exits when receiving wall message
** Attachment added: "strace-bad.txt" https://bugs.launchpad.net/ubuntu/+bug/1814905/+attachment/5236365/+files/strace-bad.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814905 Title: dash exits when receiving wall message To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1814905/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
