linux-kernel - Re: [syzbot] [trace?] WARNING in tracing_buffers_mmap

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Message-ID: <20251111232728.9139-1-hdanton@sina.com>
Date: Wed, 12 Nov 2025 07:27:26 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+a72c325b042aae6403c7@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [trace?] WARNING in tracing_buffers_mmap_close (2)

> Date: Tue, 11 Nov 2025 09:05:31 -0800
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    4a0c9b339199 Merge tag 'probes-fixes-v6.18-rc4' of git://g..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=127c3bcd980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=19d831c6d0386a9c
> dashboard link: https://syzkaller.appspot.com/bug?extid=a72c325b042aae6403c7
> compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13fb5342580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=167c3bcd980000

#syz test

--- x/mm/mmap_lock.c
+++ y/mm/mmap_lock.c
@@ -240,6 +240,7 @@ retry:
 		/* Check if the VMA got isolated after we found it */
 		if (PTR_ERR(vma) == -EAGAIN) {
 			count_vm_vma_lock_event(VMA_LOCK_MISS);
+			mas_set(&mas, address);
 			/* The area was replaced with another one */
 			goto retry;
 		}
--