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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org> To: gdb-prs@sourceware.org Subject: [Bug gdb/30866] New: [gdb/symtab] symbolic links to debuginfo not followed when debugging from outside container Date: Mon, 18 Sep 2023 13:05:41 +0000 [thread overview] Message-ID: <bug-30866-4717@http.sourceware.org/bugzilla/> (raw) https://sourceware.org/bugzilla/show_bug.cgi?id=30866 Bug ID: 30866 Summary: [gdb/symtab] symbolic links to debuginfo not followed when debugging from outside container Product: gdb Version: HEAD Status: NEW Severity: enhancement Priority: P2 Component: gdb Assignee: unassigned at sourceware dot org Reporter: vries at gcc dot gnu.org Target Milestone: --- Consider the following session: ... $ podman pull docker.io/opensuse/leap $ podman run -dt --pid host docker.io/opensuse/leap <container-id> $ podman attach <container-id> ... and: ... $ podman exec -it <container-id> bash ... to get two shells. Install emacs, gcc, gdb, sysvinit-tools using "zypper install". Create a symlink /lib64-symlink -> /lib64. Edit /etc/zypp/repos.d to enable debug repositories (open files with debug in name, replace 0 by 1 in enabled=0 line). Install glibc-debuginfo. Create test.c: ... #include <unistd.h> #include <stdio.h> static volatile int hello = 0; int main (void) { while (1) { sleep (1); if (hello) printf ("hello"); } return 0; } ... And compile it: ... $ gcc test.c -g -Wl,-rpath,/lib64-symlink ... Run it in one shell, and find the pid and attach (using system gdb) in another: ... $ gdb -iex "set debug separate-debug-file on" -p $(pidof a.out) ... Looking for separate debug info (build-id) for /lib64-symlink/libc.so.6 Trying /usr/lib/debug/.build-id/76/7aa1e4d4fc7c106971b202b6b00e92f47411dc.debug... yes! Reading symbols from /usr/lib/debug/lib64/libc-2.31.so-2.31-150300.52.2.x86_64.debug... ... Note that gdb manages to follow the symlink of the .build-id file. Likewise, if we move .build-id to .id-build, we get instead: ... Looking for separate debug info (debug link) for /lib64-symlink/libc.so.6 Trying /lib64/libc-2.31.so-2.31-150300.52.2.x86_64.debug... no, unable to open. Trying /lib64/.debug/libc-2.31.so-2.31-150300.52.2.x86_64.debug... no, unable to open. Trying /usr/lib/debug//lib64/libc-2.31.so-2.31-150300.52.2.x86_64.debug... yes! Reading symbols from /usr/lib/debug//lib64/libc-2.31.so-2.31-150300.52.2.x86_64.debug... ... Note that again gdb manages to follow a symlink. Now try from outside the container (using current gdb build from source) and sudo (and re-enable .build-id): ... Looking for separate debug info (build-id) for target:/lib64-symlink/libc.so.6 Trying /usr/lib/debug/.build-id/76/7aa1e4d4fc7c106971b202b6b00e92f47411dc.debug... no, unable to compute real path Trying target:/usr/lib/debug/.build-id/76/7aa1e4d4fc7c106971b202b6b00e92f47411dc.debug... yes! Reading symbols from target:/usr/lib/debug/.build-id/76/7aa1e4d4fc7c106971b202b6b00e92f47411dc.debug... ... Note that in this case, we didn't follow the symlink. That is not a problem, the file system handling follows the symlink and the file is found. Again, move .build-id to .id-build: ... Looking for separate debug info (debug link) for target:/lib64-symlink/libc.so.6 Trying target:/lib64-symlink/libc-2.31.so-2.31-150300.52.2.x86_64.debug... no, unable to open. Trying target:/lib64-symlink/.debug/libc-2.31.so-2.31-150300.52.2.x86_64.debug... no, unable to open. Trying target:/usr/lib/debug//lib64-symlink/libc-2.31.so-2.31-150300.52.2.x86_64.debug... no, unable to open. Trying target:/usr/lib/debug/lib64-symlink//libc-2.31.so-2.31-150300.52.2.x86_64.debug... no, unable to open. (No debugging symbols found in target:/lib64-symlink/libc.so.6) ... Note that in this case again, we didn't follow the symlink, but this time resulting in not finding the debuginfo file. -- You are receiving this mail because: You are on the CC list for the bug.
next reply other threads:[~2023-09-18 13:05 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-09-18 13:05 vries at gcc dot gnu.org [this message] 2023-09-18 13:08 ` [Bug gdb/30866] " vries at gcc dot gnu.org 2023-09-18 13:20 ` [Bug symtab/30866] " vries at gcc dot gnu.org 2023-09-19 11:58 ` tromey at sourceware dot org 2023-09-19 17:06 ` jamborm at gcc dot gnu.org
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