GitHub pull request #2324 of commit f47fef57cca8bda6d68c18f96d1f2edfc83e8191, no merge conflicts.sha1origin/pr/2324/mergeghprbActualCommitf47fef57cca8bda6d68c18f96d1f2edfc83e8191ghprbActualCommitAuthorghprbActualCommitAuthorEmailghprbAuthorRepoGitUrlhttps://github.com/davemarchevsky/bcc.gitghprbTriggerAuthorghprbTriggerAuthorEmailghprbTriggerAuthorLoginyonghong-songghprbTriggerAuthorLoginMention@yonghong-songghprbPullId2324ghprbTargetBranchmasterghprbSourceBranchchroot_relative_pathsGIT_BRANCHchroot_relative_pathsghprbPullAuthorEmaildavemarchevsky@gmail.comghprbPullAuthorLogindavemarchevskyghprbPullAuthorLoginMention@davemarchevskyghprbPullDescriptionGitHub pull request #2324 of commit f47fef57cca8bda6d68c18f96d1f2edfc83e8191, no merge conflicts.ghprbPullTitleUse /proc/[pid]/root when looking at /proc/[pid]/maps pathsghprbPullLinkhttps://github.com/iovisor/bcc/pull/2324ghprbPullLongDescriptionI recently ran into a problem when trying to attach to a USDT in a shared library. Specifically, the shared library was loaded into the address space of a chrooted process. If I just provide the `pid` of this process, initializing `USDT` object fails because all paths in `/proc/[pid]/maps` for the target are relative to its chroot, while the process I'm trying to attach from is not in a chroot and therefore the paths don't make sense and `USDT` initialization can't look through shared lib ELFs to find the right probe.\r\n\r\nSimilarly, if I try to initialize the `USDT` object with `pid` and `bin_path` to the shared lib, initialization succeeds but actually attaching fails: address lookup for the usdt's semaphore in `pid`'s address space fails because `/proc/[pid]/maps` shared lib path is expected to match provided `bin_path` exactly, but maps paths are chroot-relative so this doesn't work.\r\n\r\nImplementation evolved significantly since this PR was created, look at [this comment](https://github.com/iovisor/bcc/pull/2324#issuecomment-494169782) for details about impl.ghprbCommentBody[buildbot, test this please]ghprbGhRepositoryiovisor/bccghprbCredentialsId6d3daf13-69b8-48b1-9c8f-ec5353264113false<a title="Use /proc/[pid]/root when looking at /proc/[pid]/maps paths" href="https://github.com/iovisor/bcc/pull/2324">PR #2324</a>: Use /proc/[pid]/root when l...#1010620397460664bcc-pr #1010false1094FAILURE1562740425253https://buildbot.iovisor.org/jenkins/user/danobi/my-views/view/all/job/bcc-pr/10/git10https://buildbot.iovisor.org/jenkins/user/danobi/my-views/view/all/job/bcc-pr/label=fc25/10/10https://buildbot.iovisor.org/jenkins/user/danobi/my-views/view/all/job/bcc-pr/label=fc26/10/10https://buildbot.iovisor.org/jenkins/user/danobi/my-views/view/all/job/bcc-pr/label=fc27/10/10https://buildbot.iovisor.org/jenkins/user/danobi/my-views/view/all/job/bcc-pr/label=fc28/10/10https://buildbot.iovisor.org/jenkins/user/danobi/my-views/view/all/job/bcc-pr/label=ubuntu1604/10/10https://buildbot.iovisor.org/jenkins/user/danobi/my-views/view/all/job/bcc-pr/label=ubuntu1710/10/10https://buildbot.iovisor.org/jenkins/user/danobi/my-views/view/all/job/bcc-pr/label=ubuntu1804/10/