linux uml segfault

[Ritesh Raj Sarraf]

On Tue, 2021-03-02 at 11:34 +0000, Anton Ivanov wrote:
> If gdb gives you the exact lines, that may be helpful.

It doesn't. But it does show drawbacks in my packaging. The debug
symbols packaged are not read/honored by gdb at all.

```
Reading symbols from /usr/bin/linux.uml...
Reading symbols from /usr/lib/debug/.build-
id/6f/ea141539149074c72e80fb8004de124fda115b.debug...
(No debugging symbols found in /usr/lib/debug/.build-
id/6f/ea141539149074c72e80fb8004de124fda115b.debug)

warning: Can't open file /dev/shm/#20817 (deleted) during file-backed
mapping note processing
[New LWP 18788]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-
gnu/libthread_db.so.1".
Core was generated by `linux ubd0=qemu-linux-image.img'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007f51842c0087 in kill () at ../sysdeps/unix/syscall-
template.S:120
120     ../sysdeps/unix/syscall-template.S: No such file or directory.
(gdb) bt
#0  0x00007f51842c0087 in kill () at ../sysdeps/unix/syscall-
template.S:120
#1  0x000000006049dc20 in uml_abort ()
#2  0x000000006049de7a in os_dump_core ()
#3  0x0000000060486e47 in panic_exit ()
#4  0x00000000604c0a03 in notifier_call_chain ()
#5  0x00000000604c0a98 in atomic_notifier_call_chain ()
#6  0x0000000060a26b85 in panic ()
#7  0x00000000604869e1 in segv ()
#8  0x0000000060486ba9 in segv_handler ()
#9  0x000000006049ccc0 in sig_handler_common ()
#10 0x000000006049d1ec in sig_handler ()
#11 0x000000006049cdc6 in hard_handler ()
#12 <signal handler called>
#13 0x00000000604d45b4 in vprintk_store ()
#14 0x00000000604d4aa8 in vprintk_emit ()
#15 0x00000000604d4d86 in vprintk_deferred ()
#16 0x0000000060a27a02 in printk_deferred ()
#17 0x00000000609031b2 in get_random_u32 ()
#18 0x000000006088ff65 in bucket_table_alloc.isra ()
#19 0x0000000060890740 in rhashtable_init ()
#20 0x00000000607efaa2 in ipc_init_ids ()
#21 0x00000000600153c9 in sem_init ()
```

So the best I can extract for you is to compile the kernel with as much
information as possible.

Thanks,
Ritesh

-- 
Ritesh Raj Sarraf | http://people.debian.org/~rrs
Debian - The Universal Operating System
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