------------[ cut here ]------------
!err
WARNING: fs/ext4/inode.c:2512 at mpage_map_one_extent fs/ext4/inode.c:2512 [inline], CPU#0: syz.8.1195/21789
WARNING: fs/ext4/inode.c:2512 at mpage_map_and_submit_extent fs/ext4/inode.c:2601 [inline], CPU#0: syz.8.1195/21789
WARNING: fs/ext4/inode.c:2512 at ext4_do_writepages+0x33b6/0x44b0 fs/ext4/inode.c:3077, CPU#0: syz.8.1195/21789
Modules linked in:
CPU: 0 UID: 0 PID: 21789 Comm: syz.8.1195 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:mpage_map_one_extent fs/ext4/inode.c:2512 [inline]
RIP: 0010:mpage_map_and_submit_extent fs/ext4/inode.c:2601 [inline]
RIP: 0010:ext4_do_writepages+0x33b6/0x44b0 fs/ext4/inode.c:3077
Code: 0f 0b 90 e9 b6 d9 ff ff e8 67 66 38 ff 90 0f 0b 90 e9 e6 dc ff ff e8 59 66 38 ff 90 0f 0b 90 e9 94 df ff ff e8 4b 66 38 ff 90 <0f> 0b 90 bb ea ff ff ff e9 ae f8 ff ff e8 38 66 38 ff 48 8d 3d d1
RSP: 0018:ffffc90004eef040 EFLAGS: 00010283
RAX: ffffffff828f7625 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9001cb36000 RSI: 00000000000007ca RDI: 00000000000007cb
RBP: ffffc90004eef450 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100d628e60 R12: ffffc90004eef500
R13: dffffc0000000000 R14: 0000000000000001 R15: 1ffff1100d628e75
FS:  00007f02618fd6c0(0000) GS:ffff888124727000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2d19d2e440 CR3: 000000005c76e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ext4_writepages+0x1fe/0x4e0 fs/ext4/inode.c:3171
 do_writepages+0x338/0x560 mm/page-writeback.c:2560
 filemap_writeback mm/filemap.c:387 [inline]
 filemap_fdatawrite_range mm/filemap.c:412 [inline]
 file_write_and_wait_range+0x374/0x440 mm/filemap.c:786
 ext4_sync_file+0x255/0xa40 fs/ext4/fsync.c:145
 generic_write_sync include/linux/fs.h:2693 [inline]
 ext4_buffered_write_iter+0x477/0x540 fs/ext4/file.c:378
 ext4_file_write_iter+0xafc/0x1d00 fs/ext4/file.c:-1
 do_iter_readv_writev+0x624/0x8d0 fs/read_write.c:-1
 vfs_writev+0x34c/0x990 fs/read_write.c:1058
 do_writev+0x15a/0x2e0 fs/read_write.c:1104
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f02636cf559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f02618fd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f0263956090 RCX: 00007f02636cf559
RDX: 0000000000000002 RSI: 0000200000000900 RDI: 0000000000000004
RBP: 00007f0263766b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0263956128 R14: 00007f0263956090 R15: 00007ffc26d9bf68
 </TASK>