loop0: detected capacity change from 0 to 128
VFS: Found a Xenix FS (block size = 512) on device loop0
sysv_free_block: trying to free block not in datazone
loop0: detected capacity change from 128 to 0
syz.0.0: attempt to access beyond end of device
loop0: rw=2049, sector=2, nr_sectors = 1 limit=0
Buffer I/O error on dev loop0, logical block 2, lost sync page write
IO error syncing sysv inode [loop0:00000002]
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5329 at fs/buffer.c:1177 mark_buffer_dirty+0x2e5/0x520 fs/buffer.c:1177
Modules linked in:
CPU: 0 UID: 0 PID: 5329 Comm: syz.0.0 Not tainted 6.12.0-rc7-syzkaller-00187-gf868cd251776 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:mark_buffer_dirty+0x2e5/0x520 fs/buffer.c:1177
Code: 89 df e8 ae 78 db ff 48 8b 3b be 20 00 00 00 5b 41 5e 41 5f 5d e9 fb e8 fb ff e8 36 9c 71 ff e9 73 ff ff ff e8 2c 9c 71 ff 90 <0f> 0b 90 e9 61 fd ff ff e8 1e 9c 71 ff 90 0f 0b 90 e9 88 fd ff ff
RSP: 0018:ffffc9000d2df670 EFLAGS: 00010283
RAX: ffffffff82234de4 RBX: ffff888040b5d001 RCX: 0000000000040000
RDX: ffffc9000d321000 RSI: 00000000000014c3 RDI: 00000000000014c4
RBP: 0000000000000000 R08: ffffffff82234b41 R09: 1ffff110087b2acb
R10: dffffc0000000000 R11: ffffed10087b2acc R12: 000000000000000c
R13: ffff888040b5d00c R14: ffff888043d95658 R15: dffffc0000000000
FS:  00007f09fe9af6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200044c0 CR3: 0000000041290000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dirty_sb fs/sysv/sysv.h:117 [inline]
 sysv_new_block+0x607/0x970 fs/sysv/balloc.c:150
 alloc_branch fs/sysv/itree.c:135 [inline]
 get_block+0x30a/0x16d0 fs/sysv/itree.c:254
 __block_write_begin_int+0x50c/0x1a70 fs/buffer.c:2121
 block_write_begin+0x8f/0x120 fs/buffer.c:2231
 sysv_write_begin+0x31/0x70 fs/sysv/itree.c:490
 generic_perform_write+0x344/0x6d0 mm/filemap.c:4054
 generic_file_write_iter+0xae/0x310 mm/filemap.c:4181
 new_sync_write fs/read_write.c:590 [inline]
 vfs_write+0xaeb/0xd30 fs/read_write.c:683
 ksys_write+0x183/0x2b0 fs/read_write.c:736
 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: 0033:0x7f09fdb7e719
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:00007f09fe9af038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f09fdd35f80 RCX: 00007f09fdb7e719
RDX: 000000000000fb3f RSI: 0000000020000240 RDI: 0000000000000005
RBP: 00007f09fdbf175e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f09fdd35f80 R15: 00007ffc5e8aff18
 </TASK>