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-ec5353264113Started by upstream project "bcc-pr" build number 1313bcc-prjob/bcc-pr/12393c0543312f2221033e6bdb40cd0f3381428b11393c0543312f2221033e6bdb40cd0f3381428b11refs/remotes/origin/pr/2433/merge393c0543312f2221033e6bdb40cd0f3381428b11393c0543312f2221033e6bdb40cd0f3381428b11refs/remotes/origin/pr/2433/merge1391925f723c4424884963ac2f5e8d3cbeae01c30491925f723c4424884963ac2f5e8d3cbeae01c304refs/remotes/origin/pr/2324/merge91925f723c4424884963ac2f5e8d3cbeae01c30491925f723c4424884963ac2f5e8d3cbeae01c304refs/remotes/origin/pr/2324/merge110de2759a56d8ec943a4cbaa861835ea9ca6997340de2759a56d8ec943a4cbaa861835ea9ca699734refs/remotes/origin/pr/2451/merge0de2759a56d8ec943a4cbaa861835ea9ca6997340de2759a56d8ec943a4cbaa861835ea9ca699734refs/remotes/origin/pr/2451/merge7fdc23289503102ec3712dac2aa8db50c0659f1b8fdc23289503102ec3712dac2aa8db50c0659f1b8refs/remotes/origin/pr/2438/mergefdc23289503102ec3712dac2aa8db50c0659f1b8fdc23289503102ec3712dac2aa8db50c0659f1b8refs/remotes/origin/pr/2438/merge3ef216ad8a72a283090f026554d1a07bbe18612bdef216ad8a72a283090f026554d1a07bbe18612bdrefs/remotes/origin/pr/2450/mergeef216ad8a72a283090f026554d1a07bbe18612bdef216ad8a72a283090f026554d1a07bbe18612bdrefs/remotes/origin/pr/2450/merge81d33111c31f8226d64a0feea11eb6bbb7195ea401d33111c31f8226d64a0feea11eb6bbb7195ea40refs/remotes/origin/pr/2437/merge1d33111c31f8226d64a0feea11eb6bbb7195ea401d33111c31f8226d64a0feea11eb6bbb7195ea40refs/remotes/origin/pr/2437/merge9af079dd26be2ead11e98c6f113997fb2bc8c6684af079dd26be2ead11e98c6f113997fb2bc8c6684refs/remotes/origin/pr/2431/mergeaf079dd26be2ead11e98c6f113997fb2bc8c6684af079dd26be2ead11e98c6f113997fb2bc8c6684refs/remotes/origin/pr/2431/merge1664c8152485a4208ef3647a9660c18e2c00c7469664c8152485a4208ef3647a9660c18e2c00c7469refs/remotes/origin/pr/2449/merge664c8152485a4208ef3647a9660c18e2c00c7469664c8152485a4208ef3647a9660c18e2c00c7469refs/remotes/origin/pr/2449/merge91925f723c4424884963ac2f5e8d3cbeae01c30491925f723c4424884963ac2f5e8d3cbeae01c304refs/remotes/origin/pr/2324/mergehttps://github.com/iovisor/bcc.gitfalse#139835561197304bcc-pr » ubuntu1804 #1313false13133SUCCESS1562792998550https://buildbot.iovisor.org/jenkins/user/casparant/my-views/view/all/job/bcc-pr/label=ubuntu1804/13/ubuntu1804-slave-82agit