linux-kernel - Re: [syzbot] [gfs2?] WARNING in chown

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Message-ID: <69108152.a70a0220.22f260.00ae.GAE@google.com>
Date: Sun, 09 Nov 2025 03:56:02 -0800
From: syzbot <syzbot+04c2672c56fbb9401640@...kaller.appspotmail.com>
To: kartikey406@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [gfs2?] WARNING in chown_common

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in swap_cache_get_folio

------------[ cut here ]------------
WARNING: mm/swap.h:87 at __swap_offset_to_cluster mm/swap.h:87 [inline], CPU#0: syz-executor/5541
WARNING: mm/swap.h:87 at __swap_entry_to_cluster mm/swap.h:93 [inline], CPU#0: syz-executor/5541
WARNING: mm/swap.h:87 at swap_cache_get_folio+0x365/0x530 mm/swap_state.c:94, CPU#0: syz-executor/5541
Modules linked in:
CPU: 0 UID: 0 PID: 5541 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__swap_offset_to_cluster mm/swap.h:87 [inline]
RIP: 0010:__swap_entry_to_cluster mm/swap.h:93 [inline]
RIP: 0010:swap_cache_get_folio+0x365/0x530 mm/swap_state.c:94
Code: ff 31 ed e9 2a ff ff ff e8 98 22 a1 ff 90 0f 0b 90 e9 3d fd ff ff e8 8a 22 a1 ff 90 0f 0b 90 e9 44 fd ff ff e8 7c 22 a1 ff 90 <0f> 0b 90 e9 6b fd ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 3e
RSP: 0018:ffffc9000cb6fa40 EFLAGS: 00010293
RAX: ffffffff82206d54 RBX: 00000000000001ff RCX: ffff8880003da4c0
RDX: 0000000000000000 RSI: 0000000000007a12 RDI: 0003ffffffffffff
RBP: ffffffff99a78920 R08: 0000000000000000 R09: ffffffff82158099
R10: dffffc0000000000 R11: fffff9400023d3cf R12: ffff88801a839800
R13: dffffc0000000000 R14: 0000000000007a12 R15: 0003ffffffffffff
FS:  0000555569d2f500(0000) GS:ffff88808d2b8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555569d49300 CR3: 000000004ffac000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 unuse_pte_range mm/swapfile.c:2282 [inline]
 unuse_pmd_range mm/swapfile.c:2332 [inline]
 unuse_pud_range mm/swapfile.c:2352 [inline]
 unuse_p4d_range mm/swapfile.c:2372 [inline]
 unuse_vma mm/swapfile.c:2393 [inline]
 unuse_mm mm/swapfile.c:2411 [inline]
 try_to_unuse+0xd6f/0x2ce0 mm/swapfile.c:2488
 __do_sys_swapoff mm/swapfile.c:2884 [inline]
 __se_sys_swapoff+0x431/0xa10 mm/swapfile.c:2824
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f728438eeb7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc54ebd478 EFLAGS: 00000202 ORIG_RAX: 00000000000000a8
RAX: ffffffffffffffda RBX: 0000555569d492c0 RCX: 00007f728438eeb7
RDX: 000000000000002f RSI: 00007f728442e70b RDI: 00007f7284412bc1
RBP: 00007f7284412bc1 R08: 00007f72845b7d20 R09: 0000000000000060
R10: 0000000000000000 R11: 0000000000000202 R12: 00007f72845b1270
R13: 00007f72843ec1a0 R14: 00007f72845b1240 R15: 00007f728442e698
 </TASK>


Tested on:

commit:         9c0826a5 Add linux-next specific files for 20251107
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=11fe3084580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3983c6ffb8f8b6b5
dashboard link: https://syzkaller.appspot.com/bug?extid=04c2672c56fbb9401640
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=15356a92580000