I have found a change between 176 and 177 that looks suspicious: diff -upr --color 176/linux-source-4.15.0/kernel/module.c 177/linux-source-4.15.0/kernel/module.c --- 176/linux-source-4.15.0/kernel/module.c 2022-03-29 19:39:48.000000000 +0200 +++ 177/linux-source-4.15.0/kernel/module.c 2022-04-14 22:22:50.000000000 +0200 @@ -3520,22 +3514,13 @@ static noinline int do_init_module(struc - /* - * We need to finish all async code before the module init sequence - * is done. This has potential to deadlock. For example, a newly - * detected block device can trigger request_module() of the - * default iosched from async probing task. Once userland helper - * reaches here, async_synchronize_full() will wait on the async - * task waiting on request_module() and deadlock. - * - * This deadlock is avoided by perfomring async_synchronize_full() - * iff module init queued any async jobs. This isn't a full - * solution as it will deadlock the same if module loading from - * async jobs nests more than once; however, due to the various - * constraints, this hack seems to be the best option for now. - * Please refer to the following thread for details. - * - * http://thread.gmane.org/gmane.linux.kernel/1420814 - */ - if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) + /* + * We need to finish all async code before the module init sequence + * is done. This has potential to deadlock if synchronous module + * loading is requested from async (which is not allowed!). + * + * See commit 0fdff3ec6d87 ("async, kmod: warn on synchronous + * request_module() from async workers") for more details. + */ + if (!mod->async_probe_requested) async_synchronize_full();
Maybe this is the deadlock we're all running into...? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
