Re: [syzbot] [mm?] KCSAN: data-race in mas_wr_store_entry / mtree_range_walk (2)

[Vlastimil Babka (SUSE)]

On 4/18/26 01:50, Liam R. Howlett wrote:
> * syzbot <syzbot+38a879f4a73497f2dfef@xxxxxxxxxxxxxxxxxxxxxxxxx> [260417 05:12]:
>> Hello,
>> 
>> syzbot found the following issue on:
>> 
>> HEAD commit:    1d51b370a0f8 Merge tag 'jfs-7.1' of github.com:kleikamp/li..
>> git tree:       upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=117dc4ce580000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=7f207c4b1fbf85a3
>> dashboard link: https://syzkaller.appspot.com/bug?extid=38a879f4a73497f2dfef
>> compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
>> 
>> Unfortunately, I don't have any reproducer for this issue yet.
> 
> ... and you won't.  This will work unless we tear aligned unsigned long
> writes/reads.

Note I think the reproducer here means code that will trigger that KCSAN
alert deterministically (as opposed to fuzzing), not something that would
depend on whether the alert is pointing to a "real" problem.