On 02/03/2021 14:23, Ritesh Raj Sarraf wrote:
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.
Can you try using one of the older kernels so we can verify if this is indeed a
5.10 thing.
I will do a dissect the moment I figure out how to reproduce it. I will try to
do some more experiments on that tomorrow.
Thanks,
Ritesh
--
Anton R. Ivanov
https://www.kot-begemot.co.uk/
