linux-kernel - [syzbot] [mm?] [squashfs?] WARNING in vma_merge_existing

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Message-ID: <684e5678.a00a0220.279073.0028.GAE@google.com>
Date: Sat, 14 Jun 2025 22:13:28 -0700
From: syzbot <syzbot+b9b432686bcbcac1ca01@...kaller.appspotmail.com>
To: Liam.Howlett@...cle.com, akpm@...ux-foundation.org, jannh@...gle.com, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, lorenzo.stoakes@...cle.com, 
	pfalcato@...e.de, phillip@...ashfs.org.uk, 
	squashfs-devel@...ts.sourceforge.net, syzkaller-bugs@...glegroups.com, 
	vbabka@...e.cz
Subject: [syzbot] [mm?] [squashfs?] WARNING in vma_merge_existing_range (2)

Hello,

syzbot found the following issue on:

HEAD commit:    d7fa1af5b33e Merge branch 'for-next/core' into for-kernelci
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=107b19d4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=89c13de706fbf07a
dashboard link: https://syzkaller.appspot.com/bug?extid=b9b432686bcbcac1ca01
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1424b60c580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=147b19d4580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/da97ad659b2c/disk-d7fa1af5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/659e123552a8/vmlinux-d7fa1af5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6ec5dbf4643e/Image-d7fa1af5.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/3df2a90115c7/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b9b432686bcbcac1ca01@...kaller.appspotmail.com

    ffff93069000-ffffd1a12fff: 0000000000000000
    ffffd1a13000-ffffd1a33fff: ffff0000ca00b640
    ffffd1a34000-ffffffffffffffff: 0000000000000000
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6489 at mm/vma.c:768 vma_merge_existing_range+0x14a8/0x1964 mm/vma.c:768
Modules linked in:
CPU: 0 UID: 0 PID: 6489 Comm: syz-executor371 Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : vma_merge_existing_range+0x14a8/0x1964 mm/vma.c:768
lr : vma_merge_existing_range+0x14a8/0x1964 mm/vma.c:768
sp : ffff8000a0d67910
x29: ffff8000a0d67990 x28: dfff800000000000 x27: 0000000000000001
x26: 0000000020000000 x25: ffff8000a0d67a80 x24: 0000000020000000
x23: 1ffff000141acf50 x22: ffff0000c712ca00 x21: 0000000020800000
x20: ffff0000c712ca00 x19: ffff8000a0d67a60 x18: 00000000ffffffff
x17: 0000000000000000 x16: ffff80008adbe9e4 x15: 0000000000000001
x14: 1fffe0003386aae2 x13: 0000000000000000 x12: 0000000000000000
x11: ffff60003386aae3 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000ca6a9e80 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff8000a0d66ef8 x4 : ffff80008f415ba0 x3 : ffff8000807b4b68
x2 : 0000000000000001 x1 : ffffffffffffffff x0 : ffffffffffffffff
Call trace:
 vma_merge_existing_range+0x14a8/0x1964 mm/vma.c:768 (P)
 vma_modify+0x7c/0x424 mm/vma.c:1564
 vma_modify_flags+0x18c/0x1dc mm/vma.c:1605
 mlock_fixup+0x18c/0x2c4 mm/mlock.c:483
 apply_mlockall_flags+0x290/0x344 mm/mlock.c:736
 __arm64_sys_munlockall+0x11c/0x238 mm/mlock.c:782
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
irq event stamp: 15466
hardirqs last  enabled at (15465): [<ffff80008055041c>] __up_console_sem kernel/printk/printk.c:344 [inline]
hardirqs last  enabled at (15465): [<ffff80008055041c>] __console_unlock+0x70/0xc4 kernel/printk/printk.c:2885
hardirqs last disabled at (15466): [<ffff80008adb9eb8>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:511
softirqs last  enabled at (14694): [<ffff8000803cf71c>] softirq_handle_end kernel/softirq.c:425 [inline]
softirqs last  enabled at (14694): [<ffff8000803cf71c>] handle_softirqs+0xaf8/0xc88 kernel/softirq.c:607
softirqs last disabled at (14683): [<ffff800080020efc>] __do_softirq+0x14/0x20 kernel/softirq.c:613
---[ end trace 0000000000000000 ]---


---
This report is generated by a bot. It may contain errors.
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