Re: Segmentation Fault in iwd with ell 0.68 Due to l_netlink_send()

[Rajdeep Malakar <rajdeepm.dev@gmail.com>]

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On 27/08/24 00:25, Rajdeep Malakar wrote:
Hi Denis,

> Hi Denis,
> 
> On 27/08/24 00:16, Denis Kenzior wrote:
>> Hi Rajdeep,
>>
>> On 8/26/24 1:14 PM, Rajdeep Malakar wrote:
>>> Hi,
>>>
>>> I’m encountering a segmentation fault in iwd after upgrading the ell 
>>> library from version 0.67 to 0.68. The issue seems to be related to 
>>> the l_netlink_send() function in the ell library.
>>
>> Thanks for the report.  Do you have a backtrace you can share by any 
>> chance?
>>
>> Regards,
>> -Deni
> Unfortunately, the `libell.so` I have (from Arch's [extra-testing] repo) 
> wasn't compiled with debuginfo, so all the backtrace I have is:
> 
> #0  0x00007ffff7f22de6 in l_netlink_send () from /usr/lib/libell.so.0
> #1  0x000055555556d53d in ?? ()
> #2  0x00005555555ae380 in ?? ()
> #3  0x00007ffff7f25b95 in ?? () from /usr/lib/libell.so.0
> #4  0x00007ffff7f203cb in ?? () from /usr/lib/libell.so.0
> #5  0x00007ffff7f20655 in l_main_iterate () from /usr/lib/libell.so.0
> #6  0x00007ffff7f20ace in l_main_run () from /usr/lib/libell.so.0
> #7  0x00007ffff7f223a4 in l_main_run_with_signal () from 
> /usr/lib/libell.so.0
> #8  0x000055555555fd13 in ?? ()
> #9  0x00007ffff7d0ee08 in ?? () from /usr/lib/libc.so.6
> #10 0x00007ffff7d0eecc in __libc_start_main () from /usr/lib/libc.so.6
> #11 0x0000555555560575 in ?? ()
> 
> I will try to compile it with debuginfo and get the backtrace.
> 

So, I compiled ell with a bit more info:

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7f3e17c in l_netlink_send (netlink=0x55555563bc60, 
message=0x12, function=0x0, user_data=0x555555651e50, destroy=0x10) at 
ell/netlink.c:413
413             if (unlikely(message->nest_level))

a bit more backtrace:

#0  0x00007ffff7f3e17c in l_netlink_send (netlink=0x55555563bc60, 
message=0x12, function=0x0, user_data=0x555555651e50, destroy=0x10) at 
ell/netlink.c:413
#1  0x000055555556d53d in ?? ()
#2  0x00005555555ae380 in ?? ()
#3  0x00007ffff7f40014 in process_unicast (genl=<optimized out>, 
nlmsg=0x7fffffffc140) at ell/genl.c:860
#4  received_data (io=<optimized out>, user_data=0x55555563b8b0) at 
ell/genl.c:972
#5  0x00007ffff7f3c2ac in io_callback (fd=<optimized out>, events=1, 
user_data=0x55555563b800) at ell/io.c:105
#6  0x00007ffff7f3b495 in l_main_iterate (timeout=<optimized out>) at 
ell/main.c:461
#7  0x00007ffff7f3b55c in l_main_run () at ell/main.c:508
#8  l_main_run () at ell/main.c:490
#9  0x00007ffff7f3b77b in l_main_run_with_signal (callback=<optimized 
out>, user_data=0x0) at ell/main.c:630
#10 0x000055555555fd13 in ?? ()
#11 0x00007ffff7d0ae08 in ?? () from /usr/lib/libc.so.6
#12 0x00007ffff7d0aecc in __libc_start_main () from /usr/lib/libc.so.6
#13 0x0000555555560575 in ?? ()

Let me know if you need more info.
-- 
regards,
rajdeep


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