linux-kernel - Re: [syzbot] [xfs?] [mm?] WARNING: bad unlock balance in __mm

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Message-ID: <67c845e8.050a0220.15b4b9.0021.GAE@google.com>
Date: Wed, 05 Mar 2025 04:39:04 -0800
From: syzbot <syzbot+8f9f411152c9539f4e59@...kaller.appspotmail.com>
To: eadavis@...com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [xfs?] [mm?] WARNING: bad unlock balance in __mm_populate

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING: lock held when returning to user space in __mm_populate

mm2: 00000000b2166d05, map held lock: 1, vma: 0000000029fbeeab, ret: -14, __get_user_pages
mm: 00000000b2166d05, vma: 0000000029fbeeab, mmap lock held: 1, locked: 0, ret: -14, mm addr is valid: 1, __mm_populate
================================================
WARNING: lock held when returning to user space!
6.14.0-rc4-syzkaller-ge056da87c780-dirty #0 Not tainted
------------------------------------------------
syz-executor198/8642 is leaving the kernel with locks still held!
1 lock held by syz-executor198/8642:
 #0: ffff0000d544a3d0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:190 [inline]
 #0: ffff0000d544a3d0 (&mm->mmap_lock){++++}-{4:4}, at: __mm_populate+0x1a0/0x590 mm/gup.c:2017

Tested on:

commit:         e056da87 Merge remote-tracking branch 'will/for-next/p..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=1377d7a0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d6b7e15dc5b5e776
dashboard link: https://syzkaller.appspot.com/bug?extid=8f9f411152c9539f4e59
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
patch:          https://syzkaller.appspot.com/x/patch.diff?x=17448254580000