Hi, I'm building coreutils on linux-rt-devel v5.12-rc3-rt3 e164cb00df1 [1] running on KVM, and I see a consistent failure in one of the coreutils `tail` testcases [2]: FAIL tests/tail-2/assert.sh (exit status: 1) I see that on deleting a file, the inode gets dropped, but the inotify watch that tail registered on it sometimes does not get notified. This is unexpected for tail without --retry. # touch foo; tail --follow=name foo & pid=$! # cat /proc/$pid/fdinfo/4 | grep inotify inotify wd:2 ino:123a2 sdev:fe00000 mask:c06 ignored_mask:0 fhandle-bytes:8 fhandle-type:1 f_handle:a22301004fb29f63 inotify wd:1 ino:1239f sdev:fe00000 mask:784 ignored_mask:0 fhandle-bytes:8 fhandle-type:1 f_handle:9f23010072246970 # ls -i 74658 foo # find . -inum 74658 ./foo # rm foo # find . -inum 74658 # cat /proc/$pid/fdinfo/4 | grep inotify inotify wd:2 ino:123a2 sdev:fe00000 mask:c06 ignored_mask:0 fhandle-bytes:8 fhandle-type:1 f_handle:a22301004fb29f63 inotify wd:1 ino:1239f sdev:fe00000 mask:784 ignored_mask:0 fhandle-bytes:8 fhandle-type:1 f_handle:9f23010072246970 I can also reproduce this on linux-stable-rt v5.4-rt-rebase (0dc167c2b2) [3] running as a KVM guest. Non-PREEMPT_RT builds work fine, and so does PREEMPT_RT when running on bare-metal. Any suggestions on what might be happening here? [1] https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/commit/?id=e164cb00df1c [2] https://github.com/coreutils/coreutils/blob/master/tests/tail-2/assert.sh [3] https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git/commit/?h=v5.4-rt-rebase&id=0dc167c2b2 Regards, Varad -- SUSE Software Solutions Germany GmbH Maxfeldstr. 5 90409 Nürnberg Germany HRB 36809, AG Nürnberg Geschäftsführer: Felix Imendörffer
