linux-kernel - [syzbot] [exfat?] WARNING in bdev

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Message-ID: <686a8143.a00a0220.c7b3.005b.GAE@google.com>
Date: Sun, 06 Jul 2025 06:59:31 -0700
From: syzbot <syzbot+01ef7a8da81a975e1ccd@...kaller.appspotmail.com>
To: jfs-discussion@...ts.sourceforge.net, linkinjeon@...nel.org, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	shaggy@...nel.org, sj1557.seo@...sung.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [exfat?] WARNING in bdev_getblk

Hello,

syzbot found the following issue on:

HEAD commit:    26ffb3d6f02c Add linux-next specific files for 20250704
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=127fc28c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1e4f88512ae53408
dashboard link: https://syzkaller.appspot.com/bug?extid=01ef7a8da81a975e1ccd
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fd5569903143/disk-26ffb3d6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1b0c9505c543/vmlinux-26ffb3d6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9d864c72bed1/bzImage-26ffb3d6.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+01ef7a8da81a975e1ccd@...kaller.appspotmail.com

ERROR: (device loop0): force_metapage: metapage_write_one() failed
------------[ cut here ]------------
WARNING: fs/buffer.c:1125 at __getblk_slow fs/buffer.c:1125 [inline], CPU#0: syz.0.12/6044
WARNING: fs/buffer.c:1125 at bdev_getblk+0x580/0x660 fs/buffer.c:1461, CPU#0: syz.0.12/6044
Modules linked in:
CPU: 0 UID: 0 PID: 6044 Comm: syz.0.12 Not tainted 6.16.0-rc4-next-20250704-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__getblk_slow fs/buffer.c:1125 [inline]
RIP: 0010:bdev_getblk+0x580/0x660 fs/buffer.c:1461
Code: 26 fb ff ff e8 31 e3 78 ff 48 c7 c7 a0 fd 99 8b 48 c7 c6 b8 e6 9f 8d 4c 89 fa 4c 89 e9 e8 48 d0 e0 fe eb bd e8 11 e3 78 ff 90 <0f> 0b 90 48 b8 00 00 00 00 00 fc ff df 41 80 3c 07 00 74 08 48 89
RSP: 0018:ffffc90005256f18 EFLAGS: 00010287
RAX: ffffffff8246cd6f RBX: ffff888022ccc518 RCX: 0000000000080000
RDX: ffffc9000d19d000 RSI: 000000000003d82f RDI: 000000000003d830
RBP: 0000000000001000 R08: 0000000000000000 R09: ffffffff8216f9cd
R10: dffffc0000000000 R11: fffff940003e86a7 R12: ffff888022ccce68
R13: ffff888022ccc500 R14: 0000000000001000 R15: 1ffff110045998a3
FS:  00007f72617f66c0(0000) GS:ffff888125be7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000009000 CR3: 0000000075c0a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __bread_gfp+0x89/0x3c0 fs/buffer.c:1515
 sb_bread include/linux/buffer_head.h:346 [inline]
 readSuper+0xdb/0x270 fs/jfs/jfs_mount.c:461
 updateSuper+0x1cf/0x5d0 fs/jfs/jfs_mount.c:423
 jfs_handle_error fs/jfs/super.c:69 [inline]
 jfs_error+0x198/0x2c0 fs/jfs/super.c:98
 force_metapage+0x1e7/0x360 fs/jfs/jfs_metapage.c:839
 txForce fs/jfs/jfs_txnmgr.c:2215 [inline]
 txCommit+0x4c05/0x5430 fs/jfs/jfs_txnmgr.c:1315
 duplicateIXtree+0x292/0x490 fs/jfs/jfs_imap.c:3019
 diNewIAG fs/jfs/jfs_imap.c:2597 [inline]
 diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
 diAllocAG+0x17a7/0x1df0 fs/jfs/jfs_imap.c:1669
 diAlloc+0x1d5/0x1680 fs/jfs/jfs_imap.c:1590
 ialloc+0x8c/0x8f0 fs/jfs/jfs_inode.c:56
 jfs_create+0x18d/0xa80 fs/jfs/namei.c:92
 lookup_open fs/namei.c:3708 [inline]
 open_last_lookups fs/namei.c:3807 [inline]
 path_openat+0x14f1/0x3830 fs/namei.c:4043
 do_filp_open+0x1fa/0x410 fs/namei.c:4073
 do_sys_openat2+0x121/0x1c0 fs/open.c:1434
 do_sys_open fs/open.c:1449 [inline]
 __do_sys_openat fs/open.c:1465 [inline]
 __se_sys_openat fs/open.c:1460 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1460
 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: 0033:0x7f726398e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f72617f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f7263bb6080 RCX: 00007f726398e929
RDX: 000000000000275a RSI: 0000200000000540 RDI: ffffffffffffff9c
RBP: 00007f7263a10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f7263bb6080 R15: 00007ffc735ef598
 </TASK>


---
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