syzbot

loop0: detected capacity change from 0 to 128
VFS: Found a Xenix FS (block size = 1024) on device loop0
attempt to access beyond end of device
loop0: rw=0, want=6491538, limit=128
Buffer I/O error on dev loop0, logical block 3245768, async page read
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WARNING: CPU: 1 PID: 4166 at fs/inode.c:389 inc_nlink+0x11d/0x130 fs/inode.c:389
Modules linked in:
CPU: 1 PID: 4166 Comm: syz-executor239 Not tainted 5.15.182-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:inc_nlink+0x11d/0x130 fs/inode.c:389
Code: 0d ef ff e9 3a ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 4c ff ff ff 48 89 df e8 3d 0d ef ff e9 3f ff ff ff e8 13 9a a9 ff <0f> 0b eb 82 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 57 41
RSP: 0018:ffffc90002f8fd60 EFLAGS: 00010293
RAX: ffffffff81ce23fd RBX: ffff888072b48080 RCX: ffff8880791fbb80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed1002d39a57
R10: ffffed1002d39a57 R11: 1ffff11002d39a56 R12: dffffc0000000000
R13: 1ffff1100e569010 R14: ffff888072b48038 R15: 0000000000000000
FS:  000055558b23a380(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005566c8826048 CR3: 000000002a3fd000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_inc_link_count include/linux/fs.h:2497 [inline]
 sysv_mkdir+0x1d/0x120 fs/sysv/namei.c:119
 vfs_mkdir+0x387/0x570 fs/namei.c:4065
 do_mkdirat+0x1d7/0x5a0 fs/namei.c:4090
 __do_sys_mkdirat fs/namei.c:4105 [inline]
 __se_sys_mkdirat fs/namei.c:4103 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4103
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fabd65ba679
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:00007ffc0dd789d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007fabd65ba679
RDX: 0000000000000000 RSI: 00002000000001c0 RDI: 00000000ffffff9c
RBP: 00007fabd6637610 R08: 0000000000009e87 R09: 0000000000000000
R10: 00007ffc0dd788a0 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc0dd78ba8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>