[Bug 280318] fork() can deadlock on rtld_phdr_lock

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D280318

--- Comment #3 from [email protected] ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=3D860c4d94ac46cee35a678cf3c9cdbd437=
dfed75e

commit 860c4d94ac46cee35a678cf3c9cdbd437dfed75e
Author:     Konstantin Belousov <[email protected]>
AuthorDate: 2024-07-17 04:05:33 +0000
Commit:     Konstantin Belousov <[email protected]>
CommitDate: 2024-07-29 23:57:33 +0000

    rtld: add LD_NO_DL_ITERATE_PHDR_AFTER_FORK env var

    which makes threaded fork ignore the phdr rtld lock, in particular
    allowing the dl_iterate_phdr() to block in callback.  The cost is that
    the image started in this mode cannot use dl_iterate_phdr() after fork.

    PR:     280318
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week

 libexec/rtld-elf/rtld.1      | 10 +++++++++-
 libexec/rtld-elf/rtld.c      |  1 +
 libexec/rtld-elf/rtld.h      |  1 +
 libexec/rtld-elf/rtld_lock.c |  7 +++++--
 4 files changed, 16 insertions(+), 3 deletions(-)

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