This breaks sys-power/nut # strace nut-scanner ... ... open("/lib", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFDIR|0755, st_size=12288, ...}) = 0 getdents(3, /* 172 entries */, 32768) = 6488 getdents(3, /* 0 entries */, 32768) = 0 close(3) = 0 open("/lib/libusb-0.1.la", O_RDONLY) = -1 ENOENT (No such file or directory) futex(0x7f8741fb4048, FUTEX_WAKE_PRIVATE, 2147483647) = 0 open("/lib/libusb-0.1.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) write(2, "Cannot load USB library (libusb-"..., 76Cannot load USB library (libusb-0.1) : file not found. USB search disabled. ) = 76 open("/usr/lib", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFDIR|0755, st_size=135168, ...}) = 0 getdents(3, /* 811 entries */, 32768) = 32768 getdents(3, /* 816 entries */, 32768) = 32752 getdents(3, /* 808 entries */, 32768) = 32728 getdents(3, /* 651 entries */, 32768) = 26608 getdents(3, /* 0 entries */, 32768) = 0 close(3) = 0 open("/usr/lib32/opengl/nvidia/lib", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 getdents(3, /* 14 entries */, 32768) = 496 getdents(3, /* 0 entries */, 32768) = 0 close(3) = 0 open("/usr/lib64/opengl/nvidia/lib", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 getdents(3, /* 14 entries */, 32768) = 496 getdents(3, /* 0 entries */, 32768) = 0 close(3) = 0 open("/lib64", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFDIR|0755, st_size=12288, ...}) = 0 getdents(3, /* 172 entries */, 32768) = 6488 getdents(3, /* 0 entries */, 32768) = 0 close(3) = 0 open("/lib64/libusb-0.1.la", O_RDONLY) = -1 ENOENT (No such file or directory) --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x38} --- +++ killed by SIGSEGV +++ Segmentation fault # ln -s libusb-0.1.so.4 /lib/libusb-0.1.so # nut-scanner Scanning USB bus. Scanning XML/HTTP bus. All fixed. Reproducible: Always
the reason it's breaking is that nut uses libltdl to load "libusb-0.1", and ltdl will search for the linker script (.la) file in order to find out the full name. since we trim it in libusb-compat, libltdl has to fall back to the .so, but that is also removed. simpler answer would be to fix nut by either: (1) use the USB api directly rather than trying to dlopen it (2) use dlopen (not libltdl) on libusb-0.1.so.4 instead of libusb-0.1.so loading the canonical link time "libusb-0.1.so" provides no ABI guarantees
