linux-kernel - [syzbot ci] Re: mm/rmap: make num_children and num_active

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Message-ID: <68be7d9c.050a0220.192772.0853.GAE@google.com>
Date: Sun, 07 Sep 2025 23:54:20 -0700
From: syzbot ci <syzbot+ci787cecc1f1f83578@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, david@...hat.com, harry.yoo@...cle.com, 
	liam.howlett@...cle.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	lorenzo.stoakes@...cle.com, riel@...riel.com, vbabka@...e.cz, 
	yajun.deng@...ux.dev
Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com
Subject: [syzbot ci] Re: mm/rmap: make num_children and num_active_vmas update
 in internally

syzbot ci has tested the following series

[v1] mm/rmap: make num_children and num_active_vmas update in internally
https://lore.kernel.org/all/20250905132019.18915-1-yajun.deng@linux.dev
* [PATCH] mm/rmap: make num_children and num_active_vmas update in internally

and found the following issue:
WARNING in unlink_anon_vmas

Full report is available here:
https://ci.syzbot.org/series/8f2c8574-826d-4951-a11c-201f9e6fa666

***

WARNING in unlink_anon_vmas

tree:      torvalds
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
base:      b320789d6883cc00ac78ce83bccbfe7ed58afcf0
arch:      amd64
compiler:  Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
config:    https://ci.syzbot.org/builds/6702bc54-be0f-4db2-85d2-1488a2ec7040/config

------------[ cut here ]------------
WARNING: CPU: 1 PID: 5260 at mm/rmap.c:444 unlink_anon_vmas+0x63c/0x670
Modules linked in:
CPU: 1 UID: 0 PID: 5260 Comm: mount Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:unlink_anon_vmas+0x63c/0x670
Code: 08 00 48 3b 6c 24 08 74 29 e8 30 7e af ff 49 89 ee e9 d0 fd ff ff e8 23 7e af ff 90 0f 0b 90 e9 4e fe ff ff e8 15 7e af ff 90 <0f> 0b 90 e9 82 fe ff ff e8 07 7e af ff eb 05 e8 00 7e af ff 48 83
RSP: 0018:ffffc90001bef878 EFLAGS: 00010293
RAX: ffffffff82102ffb RBX: ffff888109476118 RCX: ffff8880215d9cc0
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000
RBP: ffff88810f31e030 R08: ffff88810947611f R09: 1ffff1102128ec23
R10: dffffc0000000000 R11: ffffed102128ec24 R12: ffffffffffffffff
R13: 1ffff110212a6ce2 R14: ffff888109536710 R15: ffff888109476110
FS:  0000000000000000(0000) GS:ffff8881a3c18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8adf7b0440 CR3: 000000000df36000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 free_pgtables+0x72b/0x9c0
 exit_mmap+0x444/0xb50
 __mmput+0x118/0x420
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x21f7/0x2200
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8adf86ea90
Code: Unable to access opcode bytes at 0x7f8adf86ea66.
RSP: 002b:00007fffb8de8148 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f8adf95f860 RCX: 00007f8adf86ea90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00007f8adf95f860 R08: 00007fffb8de7fc0 R09: 00007fffb8de80a0
R10: 00007fffb8de8000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8adf963658 R15: 0000000000000001
 </TASK>


***

If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
  Tested-by: syzbot@...kaller.appspotmail.com

---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@...glegroups.com.