linux-kernel - [syzbot] [mm?] WARNING in try_to_migrate

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Message-ID: <6897b156.050a0220.51d73.0082.GAE@google.com>
Date: Sat, 09 Aug 2025 13:36:38 -0700
From: syzbot <syzbot+63859a31071a369082b1@...kaller.appspotmail.com>
To: Liam.Howlett@...cle.com, akpm@...ux-foundation.org, david@...hat.com, 
	harry.yoo@...cle.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	lorenzo.stoakes@...cle.com, riel@...riel.com, syzkaller-bugs@...glegroups.com, 
	vbabka@...e.cz
Subject: [syzbot] [mm?] WARNING in try_to_migrate_one (3)

Hello,

syzbot found the following issue on:

HEAD commit:    0227b49b5027 Merge tag 'gpio-updates-for-v6.17-rc1-part2' ..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1422d434580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2ae1da3a7f4a6ba4
dashboard link: https://syzkaller.appspot.com/bug?extid=63859a31071a369082b1
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=117c72f0580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17ab7ea2580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d0d0622733f6/disk-0227b49b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6a993871f113/vmlinux-0227b49b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0f07823c6782/bzImage-0227b49b.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+63859a31071a369082b1@...kaller.appspotmail.com

 do_initcall_level+0x104/0x190 init/main.c:1331
 do_initcalls+0x59/0xa0 init/main.c:1347
 kernel_init_freeable+0x334/0x4b0 init/main.c:1579
 kernel_init+0x1d/0x1d0 init/main.c:1469
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5866 at mm/rmap.c:2452 try_to_migrate_one+0xf27/0x34d0 mm/rmap.c:2451
Modules linked in:
CPU: 0 UID: 0 PID: 5866 Comm: syz-executor265 Not tainted 6.16.0-syzkaller-12187-g0227b49b5027 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:try_to_migrate_one+0xf27/0x34d0 mm/rmap.c:2451
Code: fb 00 00 00 f4 0f 84 35 0e 00 00 e8 f3 41 ae ff e9 73 f8 ff ff e8 e9 41 ae ff 4c 89 e7 48 c7 c6 00 79 96 8b e8 0a 92 16 ff 90 <0f> 0b 90 e9 60 ff ff ff e8 cc 41 ae ff 49 ff cf e9 3e fb ff ff e8
RSP: 0000:ffffc9000401f120 EFLAGS: 00010246
RAX: c3d51769d0dbd500 RBX: 0400000000000000 RCX: c3d51769d0dbd500
RDX: 0000000000000003 RSI: ffffffff8dba5e25 RDI: ffff8880115dda00
RBP: ffffc9000401f370 R08: ffff8880b8624253 R09: 1ffff110170c484a
R10: dffffc0000000000 R11: ffffed10170c484b R12: ffffea0001cd8000
R13: 0000000073603867 R14: dffffc0000000000 R15: ffffea0001cd8018
FS:  0000555590a54380(0000) GS:ffff888125c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000045ad50 CR3: 00000000743ea000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rmap_walk_anon+0x550/0x730 mm/rmap.c:2842
 rmap_walk_locked mm/rmap.c:2958 [inline]
 try_to_migrate+0x3f5/0x670 mm/rmap.c:2619
 unmap_folio+0x191/0x1f0 mm/huge_memory.c:3137
 __folio_split+0x90d/0x1c60 mm/huge_memory.c:3711
 try_split_folio+0x13f/0x310 mm/migrate.c:1550
 migrate_pages_batch+0x653/0x3620 mm/migrate.c:1819
 migrate_pages_sync mm/migrate.c:1974 [inline]
 migrate_pages+0x1bcc/0x2930 mm/migrate.c:2083
 do_mbind mm/mempolicy.c:1539 [inline]
 kernel_mbind mm/mempolicy.c:1682 [inline]
 __do_sys_mbind mm/mempolicy.c:1756 [inline]
 __se_sys_mbind+0xa3e/0xc30 mm/mempolicy.c:1752
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb95004e539
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffa7b144d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed
RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007fb95004e539
RDX: 0000000000000001 RSI: 0000000000600000 RDI: 0000200000000000
RBP: 00007fb9500c15f0 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
 </TASK>


---
This report is generated by a bot. It may contain errors.
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If the report is already addressed, let syzbot know by replying with:
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