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Broken stack traces on crashed programs

From: Ludovic Courtès
Subject: Broken stack traces on crashed programs
Date: Tue, 17 Nov 2020 10:57:43 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux)


I’ve noticed that I’d always get “broken” stack traces in GDB when (1)
attaching to a program suspended by /servers/crash-suspend, (2)
examining a core dump, or (3) spawning a program in GDB and examining it
after it’s received an unhandled signal like SIGILL.

At best I can see the backtrace of the msg thread, the other ones are
all question-marky:

--8<---------------cut here---------------start------------->8---
(gdb) thread 1
[Switching to thread 1 (process 310)]
#0  0x080f08c0 in ?? ()
(gdb) bt
#0  0x080f08c0 in ?? ()
#1  0x00000000 in ?? ()
(gdb) thread 2
[Switching to thread 2 (process 1)]
#0  0x0159282c in mach_msg_trap () at 
No such file or directory.
(gdb) bt
#0  0x0159282c in mach_msg_trap () at 
#1  0x01592f2a in __GI___mach_msg (msg=0x2802aa0, option=3, send_size=96, 
rcv_size=32, rcv_name=109, timeout=0, notify=0) at msg.c:111
#2  0x017dc8ab in __crash_dump_task (crashserver=132, task=1, file=133, 
signo=11, sigcode=2, sigerror=2, exc=1, code=2, subcode=210986494, 
cttyid_port=102, cttyid_portPoly=19)
#3  0x015b248c in write_corefile (detail=<optimized out>, signo=<optimized 
out>) at hurdsig.c:296
#4  post_signal (untraced=<optimized out>) at hurdsig.c:947
#5  0x015b274b in _hurd_internal_post_signal (ss=0x1800808, signo=11, 
detail=0x2802e5c, reply_port=0, reply_port_type=17, untraced=0) at 
#6  0x015b3fc1 in _S_catch_exception_raise (port=96, thread=39, task=1, 
exception=1, code=2, subcode=210986494) at catch-exc.c:88
#7  0x017c09b4 in _Xexception_raise (InHeadP=0x2802f20, OutHeadP=0x2803f30) at 
#8  0x017c0a52 in _S_exc_server (InHeadP=0x2802f20, OutHeadP=0x2803f30) at 
#9  0x015a7a09 in msgport_server (inp=0x2802f20, outp=0x2803f30) at 
#10 0x015934c3 in __mach_msg_server_timeout (demux=0x15a79b0 <msgport_server>, 
max_size=4096, rcv_name=96, option=0, timeout=0) at msgserver.c:108
#11 0x01593607 in __mach_msg_server (demux=0x15a79b0 <msgport_server>, 
max_size=4096, rcv_name=96) at msgserver.c:195
#12 0x015a7a86 in _hurd_msgport_receive () at msgportdemux.c:67
#13 0x011eda50 in entry_point (self=0x804ac20, start_routine=0x15a7a30 
<_hurd_msgport_receive>, arg=0x0) at pt-create.c:62
#14 0x00000000 in ?? ()
--8<---------------cut here---------------end--------------->8---

(This is on Guix System with GDB 9.2.)

Does that ring a bell?


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