------------[ cut here ]------------
WARNING: CPU: 0 PID: 7041 at fs/ext4/inode.c:3794 ext4_iomap_begin+0x16c5/0x1900
Modules linked in:
CPU: 0 UID: 0 PID: 7041 Comm: syz.5.150 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:ext4_iomap_begin+0x16c5/0x1900
Code: 24 18 39 c3 0f 42 c3 41 01 c7 41 89 dc e9 3c f5 ff ff e8 8e 35 4c ff c7 44 24 20 09 00 00 00 e9 18 f5 ff ff e8 7c 35 4c ff 90 <0f> 0b 90 41 be de ff ff ff 4c 8b 7c 24 70 e9 18 ed ff ff 89 d9 80
RSP: 0018:ffffc900043bf520 EFLAGS: 00010293
RAX: ffffffff82737614 RBX: ffff888021b36980 RCX: ffff888022f20000
RDX: 0000000000000000 RSI: 00000000000000d4 RDI: 0000000000000000
RBP: ffffc900043bf6b8 R08: ffff888021b36987 R09: 1ffff11004366d30
R10: dffffc0000000000 R11: ffffed1004366d31 R12: dffffc0000000000
R13: 1ffff11004366d91 R14: 0000000000000000 R15: 00000000000000d4
FS:  00007f9a79a376c0(0000) GS:ffff8880b861b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8e61fa019c CR3: 000000002694a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 iomap_iter+0x534/0xde0
 __iomap_dio_rw+0xc57/0x1e30
 iomap_dio_rw+0x45/0xb0
 ext4_file_write_iter+0x16a2/0x1bc0
 vfs_write+0x5c9/0xb30
 __x64_sys_pwrite64+0x193/0x220
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9a78b8ebe9
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:00007f9a79a37038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f9a78db6090 RCX: 00007f9a78b8ebe9
RDX: 0000000000000001 RSI: 0000200000000880 RDI: 0000000000000004
RBP: 00007f9a78c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000083 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9a78db6128 R14: 00007f9a78db6090 R15: 00007ffebe2e3b78
 </TASK>
