[Bug 260979] libproc can fail to find debug symbols for jailed processes
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260979 Bug ID: 260979 Summary: libproc can fail to find debug symbols for jailed processes Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: bin Assignee: b...@freebsd.org Reporter: ma...@freebsd.org libproc knows about the .gnu_debuglink extension and will use it to find external debug files so that it can use them to do symbol resolution. When debugging a problem with lwhsu, we found that this doesn't quite work if the process is jailed but the debugger is running in the jail host. What libproc does is look up the path of a mapped file, check it for .gnu_debuglink, and then try to read /usr/lib/debug/.debug. On the jail host, this path should really be /usr/lib/debug/. In particular, libproc will fail to find the debug info. gdb has the same problem it seems. -- You are receiving this mail because: You are the assignee for the bug.
[Bug 260979] libproc can fail to find debug symbols for jailed processes
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260979 Ed Maste changed: What|Removed |Added CC||ema...@freebsd.org --- Comment #1 from Ed Maste --- When looking for debug data where debuglink specifies ls.debug and the build-id is abcdef1234 gdb attempts to access, in order: /usr/lib/debug/.build-id/ab/cdef1234.debug /usr/bin/ls.debug /usr/bin/.debug/ls.debug /usr/lib/debug/usr/bin/ls.debug (from https://sourceware.org/gdb/onlinedocs/gdb/Separate-Debug-Files.html) gdb supports "set debug-file-directory directories" I don't see an obvious way this could be handled automatically. -- You are receiving this mail because: You are the assignee for the bug.
[Bug 260979] libproc can fail to find debug symbols for jailed processes
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260979 --- Comment #2 from Ed Maste --- (by "this" I mean looking up standalone debug data in a jail-specific /usr/lib/debug directory) -- You are receiving this mail because: You are the assignee for the bug.
[Bug 260979] libproc can fail to find debug symbols for jailed processes
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260979 Mark Johnston changed: What|Removed |Added Status|New |Open --- Comment #3 from Mark Johnston --- (In reply to Ed Maste from comment #2) I'm not sure how best to deal with it either. We could look up the root path for the target process, and 1) prefix /usr/lib/debug, 2) strip that prefix from paths of mapped files, but none of this would be 100% reliable. It would perhaps be sufficient to have a way to explicitly specify the debug file prefix as a dtrace(1) option. -- You are receiving this mail because: You are the assignee for the bug.
