syzbot

loop0: detected capacity change from 0 to 128
VFS: Found a Xenix FS (block size = 1024) on device loop0
syz-executor237: 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: 1 PID: 5832 at fs/inode.c:464 inc_nlink+0x127/0x150 fs/inode.c:464
Modules linked in:
CPU: 1 UID: 0 PID: 5832 Comm: syz-executor237 Not tainted 6.12.0-syzkaller-07834-g06afb0f36106 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:inc_nlink+0x127/0x150 fs/inode.c:464
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 54 d1 e5 ff e9 3a ff ff ff e8 aa 3c 7e 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:ffffc90003d4fd30 EFLAGS: 00010293
RAX: ffffffff82171036 RBX: 1ffff1100e60c810 RCX: ffff888030539e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff82170fb0 R09: 0000000000000000
R10: ffffc90003d4fca8 R11: ffffffff82ba42a0 R12: dffffc0000000000
R13: ffff888073064080 R14: ffff888073064038 R15: 0000000000000000
FS:  000055556f85c380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000066c7e0 CR3: 00000000796a6000 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:2515 [inline]
 sysv_mkdir+0x21/0x130 fs/sysv/namei.c:119
 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4311
 do_mkdirat+0x264/0x3a0 fs/namei.c:4334
 __do_sys_mkdir fs/namei.c:4354 [inline]
 __se_sys_mkdir fs/namei.c:4352 [inline]
 __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4352
 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: 0033:0x7f698564b639
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 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:00007fff2db66818 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007fff2db669f8 RCX: 00007f698564b639
RDX: 00007f698564a6d1 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007f69856c8610 R08: 0000000000009e89 R09: 0000000000000000
R10: 00007fff2db666e0 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff2db669e8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>