Date: Mon, 6 Dec 2021 10:13:59 +0300 From: Gleb Popov <arrowd@freebsd.org> To: freebsd-hackers <freebsd-hackers@freebsd.org> Subject: nmount(2) returns undocumented EDEADLK Message-ID: <CALH631mzdOFtOqwnBgQgGfOiX-CNfME%2Boa=-XT_JK0ws8A1t3Q@mail.gmail.com>
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--000000000000b355c005d2750105 Content-Type: text/plain; charset="UTF-8" Hey hackers. I have a little program that calls the nmount(2) function in the following way: - First it mounts nullfs with fstype="nullfs", from="/src" and fspath="/dst". This works fine. - Next it tries to remount it as readonly by adding MNT_UPDATE and MNT_RDONLY to the nmount(2) call. This call fails with errno=11 (EDEADLK) for some reason. The relevant part of kdump: 19909 coolmount CALL nmount(0x801610380,0x6,0<><invalid>0) 19909 coolmount NAMI "/var/db/collaboraonline/child-roots/hQN4KQVIpWNA7Pic" 19909 coolmount NAMI "/var/db/collaboraonline/child-roots/hQN4KQVIpWNA7Pic" 19909 coolmount NAMI "/var/db/collaboraonline/systemplate" 19909 coolmount RET nmount -1 errno 11 Resource deadlock avoided Does anyone have an idea what's wrong with this? I can try coming up with minimal repro if needed. Thanks in advance. --000000000000b355c005d2750105--
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