Public bug reported: Calling "grub-mkconfig -o /boot/grub/grub.cfg" hangs. I came across this when running "apt-get upgrade", during the kernel post install step, where it hangs on this line in the log:
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.19.0-41-generic /boot/vmlinuz-3.19.0-41-generic I ran strace on calling grub-mkconfig. I'll attach the output, but here's a summary of the output. To my untrained eye, it looks like grub-mkconfig is calling pipe() and read() on a closed handle. vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv ... snip ... read(3, "/dev/mapper/ubuntu--vg-root\n", 128) = 28 read(3, "", 128) = 0 --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=17818, si_status=0, si_utime=0, si_stime=0} --- rt_sigreturn() = 0 close(3) = 0 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 17818 pipe([3, 4]) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fe3556d7a10) = 17819 close(4) = 0 read(3, ^ | NOTE: THE PROCESS HANGS THERE NOTE: AFTER KILLING THE PROCESS, THE LINE CONTINUES THERE | v read(3, 0x7ffddd6b62e0, 128) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) --- SIGTERM {si_signo=SIGTERM, si_code=SI_USER, si_pid=16554, si_uid=0} --- +++ killed by SIGTERM +++ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Here are the package versions on hand as determined by "apt-cache policy grub grub-pc grub-efi" vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv grub: Installed: (none) Candidate: 0.97-29ubuntu66 Version table: 0.97-29ubuntu66 0 500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages grub-pc: Installed: 2.02~beta2-9ubuntu1.6 Candidate: 2.02~beta2-9ubuntu1.6 Version table: *** 2.02~beta2-9ubuntu1.6 0 500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages 100 /var/lib/dpkg/status 2.02~beta2-9 0 500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages grub-efi: Installed: (none) Candidate: 2.02~beta2-9ubuntu1.6 Version table: 2.02~beta2-9ubuntu1.6 0 500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages 2.02~beta2-9 0 500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This is similar to what happened to me in bug #1510563 about a month ago. ** Affects: grub (Ubuntu) Importance: Undecided Status: New ** Tags: grub-mkconfig hang -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1527645 Title: grub-mkconfig hangs (due to acting on closed handle?) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub/+bug/1527645/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs