https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288334
Bug ID: 288334
Summary: rtld: executing "/libexec/ld-elf.so.1 /usr/bin/ld.lld"
results in a crash
Product: Base System
Version: 15.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
/libexec/ld-elf.so.1 supports something called Direct Execution Mode, described
in the man page rtld(1).
Executing the command
/libexec/ld-elf.so.1 /usr/bin/ld.lld
on 14.3-RELEASE results in a "Segmentation fault (core dumped)" error. Observed
on both arm64 and amd64.
When executing the same command on 15.0-CURRENT, there is no crash. Tested on
arm64 only.
However, if I execute the command on 15.0-CURRENT with the ld.lld binary from
14.3-RELEASE, there is again a crash. Tested on arm64 only.
A backtrace from the crash on 15.0-CURRENT:
(lldb) thread backtrace
* thread #1, name = 'ld-elf.so.1', stop reason = signal SIGSEGV: address not
mapped to object (fault address: 0x39c0fe3)
* frame #0: 0x0000441925c39448 ld-elf.so.1`memcpy(dst0=0x0000643137440020,
src0=0x00000000039c0fe0, length=4) at bcopy.c:122:4
frame #1: 0x0000441925c2c9f8 ld-elf.so.1`allocate_tls(objs=<unavailable>,
oldtcb=0x00004419a624f460, tcbsize=<unavailable>, tcbalign=16) at rtld.c:5563:5
frame #2: 0x0000441925c26ec0
ld-elf.so.1`allocate_initial_tls(objs=<unavailable>) at reloc.c:619:11
frame #3: 0x0000441925c28d40 ld-elf.so.1`_rtld(sp=<unavailable>,
exit_proc=<unavailable>, objp=<unavailable>) at rtld.c:977:2
frame #4: 0x0000441925c26064 ld-elf.so.1`.rtld_start at rtld_start.S:41
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