gdb built with musl libc segfault


Lluis Campos
 

Hi all,

This is my very first question in the Yocto mailing list. Very exited! Please let me know if I should use other list for this.


I am building an image using musl libc instead of gnu libc. I am not using yocto-tiny distro, instead I achieve this by setting on my local.conf:

TCLIBC = "musl"


My app (mender) got a segfault just starting. See output from strace:

root@raspberrypi3:~# strace mender
execve("/usr/bin/mender", ["mender"], 0x7ee65e10 /* 13 vars */) = 0
set_tls(0x76f1bffc)                     = 0
set_tid_address(0x76f1bfa0)             = 3020
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_ACCERR, si_addr=0x530bc8} ---
+++ killed by SIGSEGV +++
Segmentation fault


To be able to debug the process, I added gdb to my image adding to my local.conf:

CORE_IMAGE_EXTRA_INSTALL += "packagegroup-core-buildessential packagegroup-core-tools-debug"


Then, ironically, gdb itself also segfaults:

root@raspberrypi3:~# strace gdb 2>&1 | tail
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
getdents64(3, /* 6 entries */, 2048)    = 144
getdents64(3, /* 0 entries */, 2048)    = 0
close(3)                                = 0
ioctl(0, TIOCGWINSZ, {ws_row=25, ws_col=74, ws_xpixel=0, ws_ypixel=0}) = 0
getcwd("/home/root", 4096)              = 11
access("/usr/local/bin/gdb", X_OK)      = -1 ENOENT (No such file or directory)
access("/usr/bin/gdb", X_OK)            = 0
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x7e35aff0} ---
+++ killed by SIGSEGV +++


So, what is going on here? My guess is that some recipes are being wrongly linked with gnu libc instead of musl, and then cannot run in my device.

Any ideas on how to debug the issue?

Thanks!


Lluís Campos
mender.io
Northen Tech

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