Re: [syzbot] [perf?] possible deadlock in refcount_dec_and_mutex_lock (2)

[Tetsuo Handa]

Side effect of commit 77de62ad3de3 ("perf/core: Fix refcount bug and potential UAF in perf_mmap").

On 2026/03/07 15:53, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    5ee8dbf54602 Merge tag 'fsverity-for-linus' of git://git.k..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=101d5b5a580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c5c49ee0942d1cdb
> dashboard link: https://syzkaller.appspot.com/bug?extid=196a82fd904572696b3c
> compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11b888ba580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12f758d6580000