syzbot

loop0: detected capacity change from 0 to 128
VFS: Found a Xenix FS (block size = 1024) on device loop0
syz-executor405: attempt to access beyond end of device
loop0: rw=0, sector=6491536, nr_sectors = 2 limit=128
Buffer I/O error on dev loop0, logical block 3245768, async page read
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WARNING: CPU: 0 PID: 5830 at fs/inode.c:393 inc_nlink+0x127/0x150 fs/inode.c:393
Modules linked in:
CPU: 0 UID: 0 PID: 5830 Comm: syz-executor405 Not tainted 6.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:inc_nlink+0x127/0x150 fs/inode.c:393
Code: ff e9 35 ff ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 47 ff ff ff 4c 89 ef e8 b4 04 e6 ff e9 3a ff ff ff e8 ba 5d 7f ff 90 <0f> 0b 90 e9 7b ff ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 49
RSP: 0018:ffffc90003c57d30 EFLAGS: 00010293
RAX: ffffffff82157bf6 RBX: 1ffff1100fcf6010 RCX: ffff88803170da00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff82157b70 R09: 0000000000000000
R10: ffffc90003c57ca8 R11: ffffffff82c49a10 R12: dffffc0000000000
R13: ffff88807e7b0080 R14: ffff88807e7b0038 R15: 0000000000000000
FS:  0000555564001380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe43cdd158 CR3: 0000000033e5c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_inc_link_count include/linux/fs.h:2504 [inline]
 sysv_mkdir+0x21/0x130 fs/sysv/namei.c:119
 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4257
 do_mkdirat+0x264/0x3a0 fs/namei.c:4280
 __do_sys_mkdir fs/namei.c:4300 [inline]
 __se_sys_mkdir fs/namei.c:4298 [inline]
 __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4298
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f02af63ca59
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 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:00007fff766cd0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f02af63ca59
RDX: 00007f02af63ba51 RSI: 0000000000000000 RDI: 0000000020000040
RBP: 00007f02af6b95f0 R08: 0000000000009e89 R09: 00005555640024c0
R10: 00007fff766ccf90 R11: 0000000000000246 R12: 00007fff766cd0f0
R13: 00007fff766cd318 R14: 431bde82d7b634db R15: 00007f02af68503b
 </TASK>