loop0: detected capacity change from 0 to 512 EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. loop0: detected capacity change from 512 to 64 syz.0.0: attempt to access beyond end of device loop0: rw=2049, sector=88, nr_sectors = 24 limit=64 EXT4-fs warning (device loop0): ext4_end_bio:372: I/O error 10 writing to inode 15 starting block 44) Buffer I/O error on device loop0, logical block 44 Buffer I/O error on device loop0, logical block 45 Buffer I/O error on device loop0, logical block 46 Buffer I/O error on device loop0, logical block 47 Buffer I/O error on device loop0, logical block 48 Buffer I/O error on device loop0, logical block 49 Buffer I/O error on device loop0, logical block 50 Buffer I/O error on device loop0, logical block 51 Buffer I/O error on device loop0, logical block 52 Buffer I/O error on device loop0, logical block 53 ------------[ cut here ]------------ kernel BUG at fs/ext4/mballoc.c:4685! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5341 Comm: syz.0.0 Not tainted 6.16.0-rc7-syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4685 Code: e8 f4 3d ab ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 70 bd 47 ff 90 0f 0b e8 68 bd 47 ff 90 0f 0b e8 60 bd 47 ff 90 <0f> 0b e8 58 bd 47 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc9000ff0e8c8 EFLAGS: 00010287 RAX: ffffffff827873a0 RBX: 00000000ffffffcc RCX: 0000000000100000 RDX: ffffc9000de12000 RSI: 0000000000012d35 RDI: 0000000000012d36 RBP: 1ffff110087f7622 R08: ffff888043fbc503 R09: 1ffff110087f78a0 R10: dffffc0000000000 R11: ffffed10087f78a1 R12: 0000000000000000 R13: 0000000000000054 R14: 1ffff110087f78a3 R15: ffff888043fbc518 FS: 00007f2d0b4a96c0(0000) GS:ffff88808d218000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000019000 CR3: 000000004331d000 CR4: 0000000000352ef0 Call Trace: ext4_mb_use_preallocated+0x660/0x13f0 fs/ext4/mballoc.c:4902 ext4_mb_new_blocks+0x5b4/0x46a0 fs/ext4/mballoc.c:6206 ext4_alloc_branch fs/ext4/indirect.c:340 [inline] ext4_ind_map_blocks+0xe21/0x21b0 fs/ext4/indirect.c:635 ext4_map_create_blocks fs/ext4/inode.c:611 [inline] ext4_map_blocks+0x8d8/0x18d0 fs/ext4/inode.c:813 mpage_map_one_extent fs/ext4/inode.c:2348 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2401 [inline] ext4_do_writepages+0x1703/0x3f30 fs/ext4/inode.c:2863 ext4_writepages+0x205/0x350 fs/ext4/inode.c:2953 do_writepages+0x32e/0x550 mm/page-writeback.c:2636 filemap_fdatawrite_wbc mm/filemap.c:386 [inline] __filemap_fdatawrite_range mm/filemap.c:419 [inline] file_write_and_wait_range+0x22c/0x330 mm/filemap.c:794 generic_buffers_fsync_noflush+0x6c/0x180 fs/buffer.c:609 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline] ext4_sync_file+0x332/0xb20 fs/ext4/fsync.c:147 generic_write_sync include/linux/fs.h:3031 [inline] ext4_buffered_write_iter+0x2ca/0x3a0 fs/ext4/file.c:305 ext4_file_write_iter+0x298/0x1bc0 fs/ext4/file.c:-1 do_iter_readv_writev+0x56b/0x7f0 fs/read_write.c:-1 vfs_writev+0x31a/0x960 fs/read_write.c:1057 do_writev+0x14d/0x2d0 fs/read_write.c:1103 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: 0033:0x7f2d0a58e9a9 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:00007f2d0b4a9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f2d0a7b5fa0 RCX: 00007f2d0a58e9a9 RDX: 0000000000000001 RSI: 0000200000000140 RDI: 0000000000000004 RBP: 00007f2d0a610d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2d0a7b5fa0 R15: 00007ffc59e5f5c8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4685 Code: e8 f4 3d ab ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 70 bd 47 ff 90 0f 0b e8 68 bd 47 ff 90 0f 0b e8 60 bd 47 ff 90 <0f> 0b e8 58 bd 47 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc9000ff0e8c8 EFLAGS: 00010287 RAX: ffffffff827873a0 RBX: 00000000ffffffcc RCX: 0000000000100000 RDX: ffffc9000de12000 RSI: 0000000000012d35 RDI: 0000000000012d36 RBP: 1ffff110087f7622 R08: ffff888043fbc503 R09: 1ffff110087f78a0 R10: dffffc0000000000 R11: ffffed10087f78a1 R12: 0000000000000000 R13: 0000000000000054 R14: 1ffff110087f78a3 R15: ffff888043fbc518 FS: 00007f2d0b4a96c0(0000) GS:ffff88808d218000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000019000 CR3: 000000004331d000 CR4: 0000000000352ef0